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Date:: Wed May 12 12:41:43 2021 UTC
Message:: fix forward-char crash on empty lines
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1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 /*
18  * Ncurses UI for telescope.
19  *
20  * Text scrolling
21  * ==============
22  *
23  * ncurses allows you to scroll a window, but when a line goes out of
24  * the visible area it's forgotten.  We keep a list of formatted lines
25  * (``visual lines'') that we know fits in the window, and draw them.
26  * This way is easy to scroll: just call wscrl and then render the
27  * first/last line!
28  *
29  * This means that on every resize we have to clear our list of lines
30  * and re-render everything.  A clever approach would be to do this
31  * ``on-demand'', but it's still missing.
32  *
33  */
34 
35 #include "telescope.h"
36 
37 #include <assert.h>
38 #include <curses.h>
39 #include <event.h>
40 #include <locale.h>
41 #include <signal.h>
42 #include <stdarg.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46 
47 #define TAB_CURRENT	0x1
48 
49 #define NEW_TAB_URL	"about:new"
50 
51 static struct event	stdioev, winchev;
52 
53 static void		 load_default_keys(void);
54 static void		 restore_cursor(struct window*);
55 
56 #define CMD(fnname)	static void fnname(struct window *)
57 #define DEFALIAS(s, d)	/* nothing */
58 
59 CMD(cmd_previous_line);
60 CMD(cmd_next_line);
61 CMD(cmd_backward_char);
62 CMD(cmd_forward_char);
63 CMD(cmd_backward_paragraph);
64 CMD(cmd_forward_paragraph);
65 CMD(cmd_move_beginning_of_line);
66 CMD(cmd_move_end_of_line);
67 CMD(cmd_redraw);
68 CMD(cmd_scroll_line_down);
69 CMD(cmd_scroll_line_up);
70 CMD(cmd_scroll_up);
71 CMD(cmd_scroll_down);
72 CMD(cmd_beginning_of_buffer);
73 CMD(cmd_end_of_buffer);
74 
75 CMD(cmd_kill_telescope);
76 DEFALIAS(q, cmd_kill_telescope)
77 DEFALIAS(wq, cmd_kill_telescope)
78 
79 CMD(cmd_push_button);
80 CMD(cmd_push_button_new_tab);
81 CMD(cmd_previous_button);
82 CMD(cmd_next_button);
83 CMD(cmd_previous_page);
84 CMD(cmd_next_page);
85 CMD(cmd_clear_minibuf);
86 CMD(cmd_execute_extended_command);
87 CMD(cmd_tab_close);
88 CMD(cmd_tab_close_other);
89 
90 CMD(cmd_tab_new);
91 DEFALIAS(tabnew, cmd_tab_new)
92 
93 CMD(cmd_tab_next);
94 DEFALIAS(tabn, cmd_tab_next)
95 
96 CMD(cmd_tab_previous);
97 DEFALIAS(tabp, cmd_tab_previous)
98 
99 CMD(cmd_tab_move);
100 CMD(cmd_tab_move_to);
101 CMD(cmd_load_url);
102 CMD(cmd_load_current_url);
103 CMD(cmd_bookmark_page);
104 CMD(cmd_list_bookmarks);
105 CMD(cmd_toggle_help);
106 
107 CMD(cmd_mini_delete_char);
108 CMD(cmd_mini_delete_backward_char);
109 CMD(cmd_mini_kill_line);
110 CMD(cmd_mini_abort);
111 CMD(cmd_mini_complete_and_exit);
112 CMD(cmd_mini_previous_history_element);
113 CMD(cmd_mini_next_history_element);
114 
115 #include "cmd.gen.h"
116 
117 static void		 global_key_unbound(void);
118 static void		 minibuffer_hist_save_entry(void);
119 static void		 minibuffer_taint_hist(void);
120 static void		 minibuffer_self_insert(void);
121 static void		 eecmd_self_insert(void);
122 static void		 eecmd_select(void);
123 static void		 ir_self_insert(void);
124 static void		 ir_select(void);
125 static void		 lu_self_insert(void);
126 static void		 lu_select(void);
127 static void		 bp_select(void);
128 static void		 yornp_self_insert(void);
129 static void		 yornp_abort(void);
130 
131 static struct vline	*nth_line(struct window*, size_t);
132 static struct tab	*current_tab(void);
133 static struct window	*current_window(void);
134 static int		 readkey(void);
135 static void		 dispatch_stdio(int, short, void*);
136 static void		 handle_clear_minibuf(int, short, void*);
137 static void		 handle_resize(int, short, void*);
138 static void		 handle_resize_timeout(int, short, void*);
139 static int		 wrap_page(struct window*, int);
140 static void		 print_vline(WINDOW*, struct vline*);
141 static void		 redraw_tabline(void);
142 static void		 redraw_window(WINDOW*, int, struct window*);
143 static void		 redraw_help(void);
144 static void		 redraw_body(struct tab*);
145 static void		 redraw_modeline(struct tab*);
146 static void		 redraw_minibuffer(void);
147 static void		 redraw_tab(struct tab*);
148 static void		 emit_help_item(char*, void*);
149 static void		 rec_compute_help(struct kmap*, char*, size_t);
150 static void		 recompute_help(void);
151 static void		 vmessage(const char*, va_list);
152 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
153 static void		 start_loading_anim(struct tab*);
154 static void		 update_loading_anim(int, short, void*);
155 static void		 stop_loading_anim(struct tab*);
156 static void		 load_url_in_tab(struct tab*, const char*);
157 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
158 static void		 exit_minibuffer(void);
159 static void		 switch_to_tab(struct tab*);
160 static struct tab	*new_tab(const char*);
161 static void		 session_new_tab_cb(const char*);
162 static void		 usage(void);
163 
164 static struct { short meta; int key; uint32_t cp; } thiskey;
165 
166 static struct event	resizeev;
167 static struct timeval	resize_timer = { 0, 250000 };
168 
169 static WINDOW	*tabline, *body, *modeline, *minibuf;
170 static int	 body_lines, body_cols;
171 
172 static WINDOW		*help;
173 static struct window	 helpwin;
174 static int		 help_lines, help_cols;
175 
176 static int		 side_window;
177 
178 static struct event	clminibufev;
179 static struct timeval	clminibufev_timer = { 5, 0 };
180 static struct timeval	loadingev_timer = { 0, 250000 };
181 
182 static uint32_t		 tab_counter;
183 
184 static char	keybuf[64];
185 
186 static void (*yornp_cb)(int, unsigned int);
187 static unsigned int yornp_data;
188 
189 struct kmap global_map,
190 	minibuffer_map,
191 	*current_map,
192 	*base_map;
193 
194 static struct histhead eecmd_history,
195 	ir_history,
196 	lu_history;
197 
198 static int	in_minibuffer;
199 
200 static struct {
201 	char		*curmesg;
202 
203 	char		 prompt[64];
204 	void		 (*donefn)(void);
205 	void		 (*abortfn)(void);
206 
207 	char		 buf[1025];
208 	struct line	 line;
209 	struct vline	 vline;
210 	struct window	 window;
211 
212 	struct histhead	*history;
213 	struct hist	*hist_cur;
214 	size_t		 hist_off;
215 } ministate;
216 
217 struct lineprefix {
218 	const char	*prfx1;
219 	const char	*prfx2;
220 } line_prefixes[] = {
221 	[LINE_TEXT] =		{ "",		"" },
222 	[LINE_LINK] =		{ "=> ",	"   " },
223 	[LINE_TITLE_1] =	{ "# ",		"  " },
224 	[LINE_TITLE_2] =	{ "## ",	"   " },
225 	[LINE_TITLE_3] =	{ "### ",	"    " },
226 	[LINE_ITEM] =		{ "* ",		"  " },
227 	[LINE_QUOTE] =		{ "> ",		"  " },
228 	[LINE_PRE_START] =	{ "```",	"   " },
229 	[LINE_PRE_CONTENT] =	{ "",		"" },
230 	[LINE_PRE_END] =	{ "```",	"```" },
231 };
232 
233 static struct line_face {
234 	int prefix_prop;
235 	int text_prop;
236 } line_faces[] = {
237 	[LINE_TEXT] =		{ 0,		0 },
238 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
239 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
240 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
241 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
242 	[LINE_ITEM] =		{ 0,		0 },
243 	[LINE_QUOTE] =		{ 0,		A_DIM },
244 	[LINE_PRE_START] =	{ 0,		0 },
245 	[LINE_PRE_CONTENT] =	{ 0,		0 },
246 	[LINE_PRE_END] =	{ 0,		0 },
247 };
248 
249 static struct tab_face {
250 	int background, tab, current_tab;
251 } tab_face = {
252 	A_REVERSE, A_REVERSE, A_NORMAL
253 };
254 
255 static inline void
256 global_set_key(const char *key, void (*fn)(struct window*))
257 {
258 	if (!kmap_define_key(&global_map, key, fn))
259 		_exit(1);
260 }
261 
262 static inline void
263 minibuffer_set_key(const char *key, void (*fn)(struct window*))
264 {
265 	if (!kmap_define_key(&minibuffer_map, key, fn))
266 		_exit(1);
267 }
268 
269 static void
270 load_default_keys(void)
271 {
272 	/* === global map === */
273 
274 	/* emacs */
275 	global_set_key("C-p",		cmd_previous_line);
276 	global_set_key("C-n",		cmd_next_line);
277 	global_set_key("C-f",		cmd_forward_char);
278 	global_set_key("C-b",		cmd_backward_char);
279 	global_set_key("M-{",		cmd_backward_paragraph);
280 	global_set_key("M-}",		cmd_forward_paragraph);
281 	global_set_key("C-a",		cmd_move_beginning_of_line);
282 	global_set_key("C-e",		cmd_move_end_of_line);
283 
284 	global_set_key("M-v",		cmd_scroll_up);
285 	global_set_key("C-v",		cmd_scroll_down);
286 	global_set_key("M-space",	cmd_scroll_up);
287 	global_set_key("space",		cmd_scroll_down);
288 
289 	global_set_key("M-<",		cmd_beginning_of_buffer);
290 	global_set_key("M->",		cmd_end_of_buffer);
291 
292 	global_set_key("C-x C-c",	cmd_kill_telescope);
293 
294 	global_set_key("C-g",		cmd_clear_minibuf);
295 
296 	global_set_key("M-x",		cmd_execute_extended_command);
297 	global_set_key("C-x C-f",	cmd_load_url);
298 	global_set_key("C-x M-f",	cmd_load_current_url);
299 
300 	global_set_key("C-x t 0",	cmd_tab_close);
301 	global_set_key("C-x t 1",	cmd_tab_close_other);
302 	global_set_key("C-x t 2",	cmd_tab_new);
303 	global_set_key("C-x t o",	cmd_tab_next);
304 	global_set_key("C-x t O",	cmd_tab_previous);
305 	global_set_key("C-x t m",	cmd_tab_move);
306 	global_set_key("C-x t M",	cmd_tab_move_to);
307 
308 	global_set_key("C-M-b",		cmd_previous_page);
309 	global_set_key("C-M-f",		cmd_next_page);
310 
311 	global_set_key("<f7> a",	cmd_bookmark_page);
312 	global_set_key("<f7> <f7>",	cmd_list_bookmarks);
313 
314 	/* vi/vi-like */
315 	global_set_key("k",		cmd_previous_line);
316 	global_set_key("j",		cmd_next_line);
317 	global_set_key("l",		cmd_forward_char);
318 	global_set_key("h",		cmd_backward_char);
319 	global_set_key("{",		cmd_backward_paragraph);
320 	global_set_key("}",		cmd_forward_paragraph);
321 	global_set_key("^",		cmd_move_beginning_of_line);
322 	global_set_key("$",		cmd_move_end_of_line);
323 
324 	global_set_key("K",		cmd_scroll_line_up);
325 	global_set_key("J",		cmd_scroll_line_down);
326 
327 	global_set_key("g g",		cmd_beginning_of_buffer);
328 	global_set_key("G",		cmd_end_of_buffer);
329 
330 	global_set_key("g D",		cmd_tab_close);
331 	global_set_key("g N",		cmd_tab_new);
332 	global_set_key("g t",		cmd_tab_next);
333 	global_set_key("g T",		cmd_tab_previous);
334 	global_set_key("g M-t",		cmd_tab_move);
335 	global_set_key("g M-T",		cmd_tab_move_to);
336 
337 	global_set_key("H",		cmd_previous_page);
338 	global_set_key("L",		cmd_next_page);
339 
340 	/* tmp */
341 	global_set_key("q",		cmd_kill_telescope);
342 
343 	global_set_key("esc",		cmd_clear_minibuf);
344 
345 	global_set_key(":",		cmd_execute_extended_command);
346 
347 	/* cua */
348 	global_set_key("<up>",		cmd_previous_line);
349 	global_set_key("<down>",	cmd_next_line);
350 	global_set_key("<right>",	cmd_forward_char);
351 	global_set_key("<left>",	cmd_backward_char);
352 	global_set_key("<prior>",	cmd_scroll_up);
353 	global_set_key("<next>",	cmd_scroll_down);
354 
355 	global_set_key("M-<left>",	cmd_previous_page);
356 	global_set_key("M-<right>",	cmd_next_page);
357 
358 	/* "ncurses standard" */
359 	global_set_key("C-l",		cmd_redraw);
360 
361 	/* global */
362 	global_set_key("<f1>",		cmd_toggle_help);
363 	global_set_key("C-m",		cmd_push_button);
364 	global_set_key("M-enter",	cmd_push_button_new_tab);
365 	global_set_key("M-tab",		cmd_previous_button);
366 	global_set_key("tab",		cmd_next_button);
367 
368 	/* === minibuffer map === */
369 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
370 	minibuffer_set_key("C-g",		cmd_mini_abort);
371 	minibuffer_set_key("esc",		cmd_mini_abort);
372 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
373 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
374 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
375 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
376 
377 	minibuffer_set_key("C-b",		cmd_backward_char);
378 	minibuffer_set_key("C-f",		cmd_forward_char);
379 	minibuffer_set_key("<left>",		cmd_backward_char);
380 	minibuffer_set_key("<right>",		cmd_forward_char);
381 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
382 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
383 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
384 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
385 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
386 
387 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
388 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
389 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
390 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
391 }
392 
393 static void
394 restore_cursor(struct window *window)
395 {
396 	struct vline	*vl;
397 	const char	*prfx;
398 
399 	vl = window->current_line;
400 	if (vl == NULL || vl->line == NULL)
401 		window->curs_x = window->cpoff = 0;
402 	else
403 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
404 
405 	if (vl != NULL) {
406 		prfx = line_prefixes[vl->parent->type].prfx1;
407 		window->curs_x += utf8_swidth(prfx);
408 	}
409 }
410 
411 static void
412 cmd_previous_line(struct window *window)
413 {
414 	struct vline	*vl;
415 
416 	if (window->current_line == NULL
417 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
418 		return;
419 
420 	if (--window->curs_y < 0) {
421 		window->curs_y = 0;
422 		cmd_scroll_line_up(window);
423 		return;
424 	}
425 
426 	window->current_line = vl;
427 	restore_cursor(window);
428 }
429 
430 static void
431 cmd_next_line(struct window *window)
432 {
433 	struct vline	*vl;
434 
435 	if (window->current_line == NULL
436 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
437 		return;
438 
439 	if (++window->curs_y > body_lines-1) {
440 		window->curs_y = body_lines-1;
441 		cmd_scroll_line_down(window);
442 		return;
443 	}
444 
445 	window->current_line = vl;
446 	restore_cursor(window);
447 }
448 
449 static void
450 cmd_backward_char(struct window *window)
451 {
452 	if (window->cpoff != 0)
453 		window->cpoff--;
454 	restore_cursor(window);
455 }
456 
457 static void
458 cmd_forward_char(struct window *window)
459 {
460 	size_t len = 0;
461 
462 	if (window->current_line->line != NULL)
463 		len = utf8_cplen(window->current_line->line);
464 	if (++window->cpoff > len)
465 		window->cpoff = len;
466 	restore_cursor(window);
467 }
468 
469 static void
470 cmd_backward_paragraph(struct window *window)
471 {
472 	do {
473 		if (window->current_line == NULL ||
474 		    window->current_line == TAILQ_FIRST(&window->head)) {
475 			message("No previous paragraph");
476 			return;
477 		}
478 		cmd_previous_line(window);
479 	} while (window->current_line->line != NULL ||
480 	    window->current_line->parent->type != LINE_TEXT);
481 }
482 
483 static void
484 cmd_forward_paragraph(struct window *window)
485 {
486 	do {
487 		if (window->current_line == NULL ||
488 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
489 			message("No next paragraph");
490 			return;
491 		}
492 		cmd_next_line(window);
493 	} while (window->current_line->line != NULL ||
494 	    window->current_line->parent->type != LINE_TEXT);
495 }
496 
497 static void
498 cmd_move_beginning_of_line(struct window *window)
499 {
500 	window->cpoff = 0;
501 	restore_cursor(window);
502 }
503 
504 static void
505 cmd_move_end_of_line(struct window *window)
506 {
507 	struct vline	*vl;
508 
509 	vl = window->current_line;
510 	if (vl->line == NULL)
511 		return;
512 	window->cpoff = utf8_cplen(vl->line);
513 	restore_cursor(window);
514 }
515 
516 static void
517 cmd_redraw(struct window *window)
518 {
519 	handle_resize(0, 0, NULL);
520 }
521 
522 static void
523 cmd_scroll_line_up(struct window *window)
524 {
525 	struct vline	*vl;
526 
527 	if (window->line_off == 0)
528 		return;
529 
530 	vl = nth_line(window, --window->line_off);
531 	wscrl(body, -1);
532 	wmove(body, 0, 0);
533 	print_vline(body, vl);
534 
535 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
536 	restore_cursor(window);
537 }
538 
539 static void
540 cmd_scroll_line_down(struct window *window)
541 {
542 	struct vline	*vl;
543 
544 	vl = window->current_line;
545 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
546 		return;
547 	window->current_line = vl;
548 
549 	window->line_off++;
550 	wscrl(body, 1);
551 
552 	if (window->line_max - window->line_off < (size_t)body_lines)
553 		return;
554 
555 	vl = nth_line(window, window->line_off + body_lines-1);
556 	wmove(body, body_lines-1, 0);
557 	print_vline(body, vl);
558 
559 	restore_cursor(window);
560 }
561 
562 static void
563 cmd_scroll_up(struct window *window)
564 {
565 	size_t off;
566 
567 	off = body_lines-1;
568 
569 	for (; off > 0; --off)
570 		cmd_scroll_line_up(window);
571 }
572 
573 static void
574 cmd_scroll_down(struct window *window)
575 {
576 	size_t off;
577 
578 	off = body_lines-1;
579 
580 	for (; off > 0; --off)
581 		cmd_scroll_line_down(window);
582 }
583 
584 static void
585 cmd_beginning_of_buffer(struct window *window)
586 {
587 	window->current_line = TAILQ_FIRST(&window->head);
588 	window->line_off = 0;
589 	window->curs_y = 0;
590 	window->cpoff = 0;
591 	restore_cursor(window);
592 }
593 
594 static void
595 cmd_end_of_buffer(struct window *window)
596 {
597 	ssize_t off;
598 
599 	off = window->line_max - body_lines;
600 	off = MAX(0, off);
601 
602 	window->line_off = off;
603 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
604 
605 	window->current_line = TAILQ_LAST(&window->head, vhead);
606 	window->cpoff = body_cols;
607 	restore_cursor(window);
608 }
609 
610 static void
611 cmd_kill_telescope(struct window *window)
612 {
613 	save_session();
614 	event_loopbreak();
615 }
616 
617 static void
618 cmd_push_button(struct window *window)
619 {
620 	struct vline	*vl;
621 	size_t		 nth;
622 
623 	nth = window->line_off + window->curs_y;
624 	if (nth >= window->line_max)
625 		return;
626 	vl = nth_line(window, nth);
627 	if (vl->parent->type != LINE_LINK)
628 		return;
629 
630 	load_url_in_tab(current_tab(), vl->parent->alt);
631 }
632 
633 static void
634 cmd_push_button_new_tab(struct window *window)
635 {
636 	struct vline	*vl;
637 	size_t		 nth;
638 
639 	nth = window->line_off + window->curs_y;
640 	if (nth > window->line_max)
641 		return;
642 	vl = nth_line(window, nth);
643 	if (vl->parent->type != LINE_LINK)
644 		return;
645 
646 	new_tab(vl->parent->alt);
647 }
648 
649 static void
650 cmd_previous_button(struct window *window)
651 {
652 	do {
653 		if (window->current_line == NULL ||
654 		    window->current_line == TAILQ_FIRST(&window->head)) {
655 			message("No previous link");
656 			return;
657 		}
658 		cmd_previous_line(window);
659 	} while (window->current_line->parent->type != LINE_LINK);
660 }
661 
662 static void
663 cmd_next_button(struct window *window)
664 {
665 	do {
666 		if (window->current_line == NULL ||
667 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
668 			message("No next link");
669 			return;
670 		}
671 		cmd_next_line(window);
672 	} while (window->current_line->parent->type != LINE_LINK);
673 }
674 
675 static void
676 cmd_previous_page(struct window *window)
677 {
678 	struct tab *tab = current_tab();
679 
680 	if (!load_previous_page(tab))
681 		message("No previous page");
682 	else
683 		start_loading_anim(tab);
684 }
685 
686 static void
687 cmd_next_page(struct window *window)
688 {
689 	struct tab *tab = current_tab();
690 
691 	if (!load_next_page(tab))
692 		message("No next page");
693 	else
694 		start_loading_anim(tab);
695 }
696 
697 static void
698 cmd_clear_minibuf(struct window *window)
699 {
700 	handle_clear_minibuf(0, 0, NULL);
701 }
702 
703 static void
704 cmd_execute_extended_command(struct window *window)
705 {
706 	size_t	 len;
707 
708 	if (in_minibuffer) {
709 		message("We don't have enable-recursive-minibuffers");
710 		return;
711 	}
712 
713 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
714 	    &eecmd_history);
715 
716 	len = sizeof(ministate.prompt);
717 	strlcpy(ministate.prompt, "", len);
718 
719 	if (thiskey.meta)
720 		strlcat(ministate.prompt, "M-", len);
721 
722 	strlcat(ministate.prompt, keyname(thiskey.key), len);
723 
724 	if (thiskey.meta)
725 		strlcat(ministate.prompt, " ", len);
726 }
727 
728 static void
729 cmd_tab_close(struct window *window)
730 {
731 	struct tab *tab, *t;
732 
733 	tab = current_tab();
734 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
735 	    TAILQ_NEXT(tab, tabs) == NULL) {
736 		message("Can't close the only tab.");
737 		return;
738 	}
739 
740 	if (evtimer_pending(&tab->loadingev, NULL))
741 		evtimer_del(&tab->loadingev);
742 
743 	stop_tab(tab);
744 
745 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
746 		t = TAILQ_NEXT(tab, tabs);
747 	TAILQ_REMOVE(&tabshead, tab, tabs);
748 	free(tab);
749 
750 	switch_to_tab(t);
751 }
752 
753 static void
754 cmd_tab_close_other(struct window *window)
755 {
756 	struct tab *t, *i;
757 
758 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
759 		if (t->flags & TAB_CURRENT)
760 			continue;
761 
762 		stop_tab(t);
763 		TAILQ_REMOVE(&tabshead, t, tabs);
764 		free(t);
765 	}
766 }
767 
768 static void
769 cmd_tab_new(struct window *window)
770 {
771 	new_tab(NEW_TAB_URL);
772 }
773 
774 static void
775 cmd_tab_next(struct window *window)
776 {
777 	struct tab *tab, *t;
778 
779 	tab = current_tab();
780 	tab->flags &= ~TAB_CURRENT;
781 
782 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
783 		t = TAILQ_FIRST(&tabshead);
784 	t->flags |= TAB_CURRENT;
785 }
786 
787 static void
788 cmd_tab_previous(struct window *window)
789 {
790 	struct tab *tab, *t;
791 
792 	tab = current_tab();
793 	tab->flags &= ~TAB_CURRENT;
794 
795 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
796 		t = TAILQ_LAST(&tabshead, tabshead);
797 	t->flags |= TAB_CURRENT;
798 }
799 
800 static void
801 cmd_tab_move(struct window *window)
802 {
803 	struct tab *tab, *t;
804 
805 	tab = current_tab();
806 	t = TAILQ_NEXT(tab, tabs);
807 	TAILQ_REMOVE(&tabshead, tab, tabs);
808 
809 	if (t == NULL)
810 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
811 	else
812 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
813 }
814 
815 static void
816 cmd_tab_move_to(struct window *window)
817 {
818 	struct tab *tab, *t;
819 
820 	tab = current_tab();
821 	t = TAILQ_PREV(tab, tabshead, tabs);
822 	TAILQ_REMOVE(&tabshead, tab, tabs);
823 
824 	if (t == NULL) {
825 		if (TAILQ_EMPTY(&tabshead))
826 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
827 		else
828 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
829 	} else
830 		TAILQ_INSERT_BEFORE(t, tab, tabs);
831 }
832 
833 static void
834 cmd_load_url(struct window *window)
835 {
836 	if (in_minibuffer) {
837 		message("We don't have enable-recursive-minibuffers");
838 		return;
839 	}
840 
841 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
842 	    &lu_history);
843 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
844 	strlcpy(ministate.buf, "gemini://", sizeof(ministate.buf));
845 	cmd_move_end_of_line(&ministate.window);
846 }
847 
848 static void
849 cmd_load_current_url(struct window *window)
850 {
851 	struct tab *tab = current_tab();
852 
853 	if (in_minibuffer) {
854 		message("We don't have enable-recursive-minibuffers");
855 		return;
856 	}
857 
858 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
859 	    &lu_history);
860 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
861 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
862 	ministate.window.cpoff = utf8_cplen(ministate.buf);
863 }
864 
865 static void
866 cmd_bookmark_page(struct window *window)
867 {
868 	struct tab *tab = current_tab();
869 
870 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
871 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
872 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
873 	ministate.window.cpoff = utf8_cplen(ministate.buf);
874 }
875 
876 static void
877 cmd_list_bookmarks(struct window *window)
878 {
879 	load_url_in_tab(current_tab(), "about:bookmarks");
880 }
881 
882 static void
883 cmd_toggle_help(struct window *window)
884 {
885 	side_window = !side_window;
886 	if (side_window)
887 		recompute_help();
888 
889 	/*
890 	 * ugly hack, but otherwise the window doesn't get updated
891 	 * until I call handle_resize a second time (i.e. C-l).  I
892 	 * will be happy to know why something like this is needed.
893 	 */
894 	handle_resize(0, 0, NULL);
895 	handle_resize(0, 0, NULL);
896 }
897 
898 static void
899 cmd_mini_delete_char(struct window *window)
900 {
901 	char *c, *n;
902 
903 	if (!in_minibuffer) {
904 		message("text is read-only");
905 		return;
906 	}
907 
908 	minibuffer_taint_hist();
909 
910 	c = utf8_nth(window->current_line->line, window->cpoff);
911 	if (*c == '\0')
912 		return;
913 	n = utf8_next_cp(c);
914 
915 	memmove(c, n, strlen(n)+1);
916 }
917 
918 static void
919 cmd_mini_delete_backward_char(struct window *window)
920 {
921 	char *c, *p, *start;
922 
923 	if (!in_minibuffer) {
924 		message("text is read-only");
925 		return;
926 	}
927 
928 	minibuffer_taint_hist();
929 
930 	c = utf8_nth(window->current_line->line, window->cpoff);
931 	start = window->current_line->line;
932 	if (c == start)
933 		return;
934 	p = utf8_prev_cp(c-1, start);
935 
936 	memmove(p, c, strlen(c)+1);
937 	window->cpoff--;
938 }
939 
940 static void
941 cmd_mini_kill_line(struct window *window)
942 {
943 	char *c;
944 
945 	if (!in_minibuffer) {
946 		message("text is read-only");
947 		return;
948 	}
949 
950 	minibuffer_taint_hist();
951 	c = utf8_nth(window->current_line->line, window->cpoff);
952 	*c = '\0';
953 }
954 
955 static void
956 cmd_mini_abort(struct window *window)
957 {
958 	if (!in_minibuffer)
959 		return;
960 
961 	ministate.abortfn();
962 }
963 
964 static void
965 cmd_mini_complete_and_exit(struct window *window)
966 {
967 	if (!in_minibuffer)
968 		return;
969 
970 	minibuffer_taint_hist();
971 	ministate.donefn();
972 }
973 
974 static void
975 cmd_mini_previous_history_element(struct window *window)
976 {
977 	if (ministate.history == NULL) {
978 		message("No history");
979 		return;
980 	}
981 
982 	if (ministate.hist_cur == NULL ||
983 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
984 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
985 		ministate.hist_off = ministate.history->len - 1;
986 		if (ministate.hist_cur == NULL)
987 			message("No prev item");
988 	} else {
989 		ministate.hist_off--;
990 	}
991 
992 	if (ministate.hist_cur != NULL)
993 		window->current_line->line = ministate.hist_cur->h;
994 }
995 
996 static void
997 cmd_mini_next_history_element(struct window *window)
998 {
999 	if (ministate.history == NULL) {
1000 		message("No history");
1001 		return;
1002 	}
1003 
1004 	if (ministate.hist_cur == NULL ||
1005 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
1006 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
1007 		ministate.hist_off = 0;
1008 		if (ministate.hist_cur == NULL)
1009 			message("No next item");
1010 	} else {
1011 		ministate.hist_off++;
1012 	}
1013 
1014 	if (ministate.hist_cur != NULL)
1015 		window->current_line->line = ministate.hist_cur->h;
1016 }
1017 
1018 static void
1019 global_key_unbound(void)
1020 {
1021 	message("%s is undefined", keybuf);
1022 }
1023 
1024 static void
1025 minibuffer_hist_save_entry(void)
1026 {
1027 	struct hist	*hist;
1028 
1029 	if (ministate.history == NULL)
1030 		return;
1031 
1032 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
1033 		abort();
1034 
1035 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
1036 
1037 	if (TAILQ_EMPTY(&ministate.history->head))
1038 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
1039 	else
1040 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
1041 	ministate.history->len++;
1042 }
1043 
1044 /*
1045  * taint the minibuffer cache: if we're currently showing a history
1046  * element, copy that to the current buf and reset the "history
1047  * navigation" thing.
1048  */
1049 static void
1050 minibuffer_taint_hist(void)
1051 {
1052 	if (ministate.hist_cur == NULL)
1053 		return;
1054 
1055 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1056 	ministate.hist_cur = NULL;
1057 }
1058 
1059 static void
1060 minibuffer_self_insert(void)
1061 {
1062 	char	*c, tmp[5] = {0};
1063 	size_t	len;
1064 
1065 	minibuffer_taint_hist();
1066 
1067 	if (thiskey.cp == 0)
1068 		return;
1069 
1070 	len = utf8_encode(thiskey.cp, tmp);
1071 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1072 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1073 		return;
1074 
1075 	memmove(c + len, c, strlen(c)+1);
1076 	memcpy(c, tmp, len);
1077 	ministate.window.cpoff++;
1078 }
1079 
1080 static void
1081 eecmd_self_insert(void)
1082 {
1083 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1084 	    !unicode_isgraph(thiskey.cp)) {
1085 		global_key_unbound();
1086 		return;
1087 	}
1088 
1089 	minibuffer_self_insert();
1090 }
1091 
1092 static void
1093 eecmd_select(void)
1094 {
1095 	struct cmds *cmd;
1096 
1097 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1098 		if (!strcmp(cmd->cmd, ministate.buf)) {
1099 			exit_minibuffer();
1100 			minibuffer_hist_save_entry();
1101 			cmd->fn(current_window());
1102 			return;
1103 		}
1104 	}
1105 
1106 	message("No match");
1107 }
1108 
1109 static void
1110 ir_self_insert(void)
1111 {
1112 	minibuffer_self_insert();
1113 }
1114 
1115 static void
1116 ir_select(void)
1117 {
1118 	char		 buf[1025] = {0};
1119 	struct phos_uri	 uri;
1120 	struct tab	*tab;
1121 
1122 	tab = current_tab();
1123 
1124 	exit_minibuffer();
1125 	minibuffer_hist_save_entry();
1126 
1127 	/* a bit ugly but... */
1128 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
1129 	phos_uri_set_query(&uri, ministate.buf);
1130 	phos_serialize_uri(&uri, buf, sizeof(buf));
1131 	load_url_in_tab(tab, buf);
1132 }
1133 
1134 static void
1135 lu_self_insert(void)
1136 {
1137 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1138 	    !unicode_isgraph(thiskey.key)) {
1139 		global_key_unbound();
1140 		return;
1141 	}
1142 
1143 	minibuffer_self_insert();
1144 }
1145 
1146 static void
1147 lu_select(void)
1148 {
1149 	exit_minibuffer();
1150 	minibuffer_hist_save_entry();
1151 	load_url_in_tab(current_tab(), ministate.buf);
1152 }
1153 
1154 static void
1155 bp_select(void)
1156 {
1157 	exit_minibuffer();
1158 	if (*ministate.buf != '\0')
1159 		add_to_bookmarks(ministate.buf);
1160 	else
1161 		message("Abort.");
1162 }
1163 
1164 static void
1165 yornp_self_insert(void)
1166 {
1167 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1168 		message("Please answer y or n");
1169 		return;
1170 	}
1171 
1172 	exit_minibuffer();
1173 	yornp_cb(thiskey.key == 'y', yornp_data);
1174 }
1175 
1176 static void
1177 yornp_abort(void)
1178 {
1179 	exit_minibuffer();
1180 	yornp_cb(0, yornp_data);
1181 }
1182 
1183 static struct vline *
1184 nth_line(struct window *window, size_t n)
1185 {
1186 	struct vline	*vl;
1187 	size_t		 i;
1188 
1189 	i = 0;
1190 	TAILQ_FOREACH(vl, &window->head, vlines) {
1191 		if (i == n)
1192 			return vl;
1193 		i++;
1194 	}
1195 
1196 	/* unreachable */
1197 	abort();
1198 }
1199 
1200 static struct tab *
1201 current_tab(void)
1202 {
1203 	struct tab *t;
1204 
1205 	TAILQ_FOREACH(t, &tabshead, tabs) {
1206 		if (t->flags & TAB_CURRENT)
1207 			return t;
1208 	}
1209 
1210 	/* unreachable */
1211 	abort();
1212 }
1213 
1214 static struct window *
1215 current_window(void)
1216 {
1217 	if (in_minibuffer)
1218 		return &ministate.window;
1219 	return &current_tab()->window;
1220 }
1221 
1222 static int
1223 readkey(void)
1224 {
1225 	uint32_t state = 0;
1226 
1227 	if ((thiskey.key = wgetch(body)) == ERR)
1228 		return 0;
1229 
1230 	thiskey.meta = thiskey.key == 27;
1231 	if (thiskey.meta) {
1232 		thiskey.key = wgetch(body);
1233 		if (thiskey.key == ERR || thiskey.key == 27) {
1234 			thiskey.meta = 0;
1235 			thiskey.key = 27;
1236 		}
1237 	}
1238 
1239 	thiskey.cp = 0;
1240 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1241 		while (1) {
1242 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1243 				break;
1244 			if ((thiskey.key = wgetch(body)) == ERR) {
1245 				message("Error decoding user input");
1246 				return 0;
1247 			}
1248 		}
1249 	}
1250 
1251 	return 1;
1252 }
1253 
1254 static void
1255 dispatch_stdio(int fd, short ev, void *d)
1256 {
1257 	struct keymap	*k;
1258 	const char	*keyname;
1259 	char		 tmp[5] = {0};
1260 
1261 	if (!readkey())
1262 		return;
1263 
1264 	if (keybuf[0] != '\0')
1265 		strlcat(keybuf, " ", sizeof(keybuf));
1266 	if (thiskey.meta)
1267 		strlcat(keybuf, "M-", sizeof(keybuf));
1268 	if (thiskey.cp != 0) {
1269 		utf8_encode(thiskey.cp, tmp);
1270 		strlcat(keybuf, tmp, sizeof(keybuf));
1271 	} else {
1272 		if ((keyname = unkbd(thiskey.key)) != NULL)
1273 			strlcat(keybuf, keyname, sizeof(keybuf));
1274 		else {
1275 			tmp[0] = thiskey.key;
1276 			strlcat(keybuf, tmp, sizeof(keybuf));
1277 		}
1278 	}
1279 
1280 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1281 		if (k->meta == thiskey.meta &&
1282 		    k->key == thiskey.key) {
1283 			if (k->fn == NULL)
1284 				current_map = &k->map;
1285 			else {
1286 				current_map = base_map;
1287 				strlcpy(keybuf, "", sizeof(keybuf));
1288 				k->fn(current_window());
1289 			}
1290 			goto done;
1291 		}
1292 	}
1293 
1294 	if (current_map->unhandled_input != NULL)
1295 		current_map->unhandled_input();
1296 	else {
1297 		global_key_unbound();
1298 	}
1299 
1300 	strlcpy(keybuf, "", sizeof(keybuf));
1301 	current_map = base_map;
1302 
1303 done:
1304 	if (side_window)
1305 		recompute_help();
1306 
1307 	redraw_tab(current_tab());
1308 }
1309 
1310 static void
1311 handle_clear_minibuf(int fd, short ev, void *d)
1312 {
1313 	free(ministate.curmesg);
1314 	ministate.curmesg = NULL;
1315 
1316 	redraw_minibuffer();
1317 	if (in_minibuffer) {
1318 		wrefresh(body);
1319 		wrefresh(minibuf);
1320 	} else {
1321 		wrefresh(minibuf);
1322 		wrefresh(body);
1323 	}
1324 }
1325 
1326 static void
1327 handle_resize(int sig, short ev, void *d)
1328 {
1329 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
1330 		event_del(&resizeev);
1331 	}
1332 	evtimer_set(&resizeev, handle_resize_timeout, NULL);
1333 	evtimer_add(&resizeev, &resize_timer);
1334 }
1335 
1336 static void
1337 handle_resize_timeout(int s, short ev, void *d)
1338 {
1339 	struct tab	*tab;
1340 
1341 	endwin();
1342 	refresh();
1343 	clear();
1344 
1345 	/* move and resize the windows, in reverse order! */
1346 
1347 	mvwin(minibuf, LINES-1, 0);
1348 	wresize(minibuf, 1, COLS);
1349 
1350 	mvwin(modeline, LINES-2, 0);
1351 	wresize(modeline, 1, COLS);
1352 
1353 	body_lines = LINES-3;
1354 	body_cols = COLS;
1355 
1356 	if (side_window) {
1357 		help_cols = 0.3 * COLS;
1358 		help_lines = LINES-3;
1359 		mvwin(help, 1, 0);
1360 		wresize(help, help_lines, help_cols);
1361 
1362 		wrap_page(&helpwin, help_cols);
1363 
1364 		body_cols = COLS - help_cols - 1;
1365 		mvwin(body, 1, help_cols);
1366 	} else
1367 		mvwin(body, 1, 0);
1368 
1369 	wresize(body, body_lines, body_cols);
1370 
1371 	wresize(tabline, 1, COLS);
1372 
1373 	tab = current_tab();
1374 
1375 	wrap_page(&tab->window, body_cols);
1376 	redraw_tab(tab);
1377 }
1378 
1379 static int
1380 wrap_page(struct window *window, int width)
1381 {
1382 	struct line		*l;
1383 	const struct line	*orig;
1384 	struct vline		*vl;
1385 	const char		*prfx;
1386 
1387 	orig = window->current_line == NULL
1388 		? NULL
1389 		: window->current_line->parent;
1390 	window->current_line = NULL;
1391 
1392 	window->curs_y = 0;
1393 	window->line_off = 0;
1394 
1395 	empty_vlist(window);
1396 
1397 	TAILQ_FOREACH(l, &window->page.head, lines) {
1398 		prfx = line_prefixes[l->type].prfx1;
1399 		switch (l->type) {
1400 		case LINE_TEXT:
1401 		case LINE_LINK:
1402 		case LINE_TITLE_1:
1403 		case LINE_TITLE_2:
1404 		case LINE_TITLE_3:
1405 		case LINE_ITEM:
1406 		case LINE_QUOTE:
1407 		case LINE_PRE_START:
1408 		case LINE_PRE_END:
1409 			wrap_text(window, prfx, l, width);
1410 			break;
1411 		case LINE_PRE_CONTENT:
1412                         hardwrap_text(window, l, width);
1413 			break;
1414 		}
1415 
1416 		if (orig == l && window->current_line == NULL) {
1417 			window->line_off = window->line_max-1;
1418 			window->current_line = TAILQ_LAST(&window->head, vhead);
1419 
1420 			while (1) {
1421 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1422 				if (vl == NULL || vl->parent != orig)
1423 					break;
1424 				window->current_line = vl;
1425 				window->line_off--;
1426 			}
1427 		}
1428 	}
1429 
1430         if (window->current_line == NULL)
1431 		window->current_line = TAILQ_FIRST(&window->head);
1432 
1433 	return 1;
1434 }
1435 
1436 static void
1437 print_vline(WINDOW *window, struct vline *vl)
1438 {
1439 	const char *text = vl->line;
1440 	const char *prfx;
1441 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1442 	int text_face = line_faces[vl->parent->type].text_prop;
1443 
1444 	if (!vl->flags)
1445 		prfx = line_prefixes[vl->parent->type].prfx1;
1446 	else
1447 		prfx = line_prefixes[vl->parent->type].prfx2;
1448 
1449 	if (text == NULL)
1450 		text = "";
1451 
1452 	wattron(window, prefix_face);
1453 	wprintw(window, "%s", prfx);
1454 	wattroff(window, prefix_face);
1455 
1456 	wattron(window, text_face);
1457 	wprintw(window, "%s", text);
1458 	wattroff(window, text_face);
1459 }
1460 
1461 static void
1462 redraw_tabline(void)
1463 {
1464 	struct tab	*tab;
1465 	size_t		 toskip, ots, tabwidth, space, x;
1466 	int		 current, y, truncated;
1467 	const char	*title;
1468 	char		 buf[25];
1469 
1470 	tabwidth = sizeof(buf)+1;
1471 	space = COLS-2;
1472 
1473 	toskip = 0;
1474 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1475 		toskip++;
1476 		if (tab->flags & TAB_CURRENT)
1477 			break;
1478 	}
1479 
1480 	if (toskip * tabwidth < space)
1481 		toskip = 0;
1482 	else {
1483 		ots = toskip;
1484 		toskip--;
1485                 while (toskip != 0 &&
1486 		    (ots - toskip+1) * tabwidth < space)
1487 			toskip--;
1488 	}
1489 
1490 	werase(tabline);
1491 	wattron(tabline, tab_face.background);
1492 	wprintw(tabline, toskip == 0 ? " " : "<");
1493 	wattroff(tabline, tab_face.background);
1494 
1495 	truncated = 0;
1496 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1497 		if (truncated)
1498 			break;
1499 		if (toskip != 0) {
1500 			toskip--;
1501 			continue;
1502 		}
1503 
1504 		getyx(tabline, y, x);
1505 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1506 			truncated = 1;
1507 
1508 		current = tab->flags & TAB_CURRENT;
1509 
1510 		if (*(title = tab->window.page.title) == '\0')
1511 			title = tab->hist_cur->h;
1512 
1513 		strlcpy(buf, " ", sizeof(buf));
1514                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1515 			/* truncation happens */
1516 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1517 		} else {
1518 			/* pad with spaces */
1519 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1520 				/* nop */ ;
1521 		}
1522 
1523 		if (current)
1524 			wattron(tabline, tab_face.current_tab);
1525 		else
1526 			wattron(tabline, tab_face.tab);
1527 
1528 		wprintw(tabline, "%s", buf);
1529 		if (TAILQ_NEXT(tab, tabs) != NULL)
1530 			wprintw(tabline, " ");
1531 
1532 		if (current)
1533 			wattroff(tabline, tab_face.current_tab);
1534 		else
1535 			wattroff(tabline, tab_face.tab);
1536 	}
1537 
1538 	wattron(tabline, tab_face.background);
1539 	for (; x < (size_t)COLS; ++x)
1540 		waddch(tabline, ' ');
1541 	if (truncated)
1542 		mvwprintw(tabline, 0, COLS-1, ">");
1543 }
1544 
1545 static void
1546 redraw_window(WINDOW *win, int height, struct window *window)
1547 {
1548 	struct vline	*vl;
1549 	int		 l;
1550 
1551 	werase(win);
1552 
1553 	window->line_off = MIN(window->line_max-1, window->line_off);
1554 	if (TAILQ_EMPTY(&window->head))
1555 		return;
1556 
1557 	l = 0;
1558 	vl = nth_line(window, window->line_off);
1559 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1560 		wmove(win, l, 0);
1561 		print_vline(win, vl);
1562 		l++;
1563 		if (l == height)
1564 			break;
1565 	}
1566 
1567 	wmove(win, window->curs_y, window->curs_x);
1568 }
1569 
1570 static void
1571 redraw_help(void)
1572 {
1573 	redraw_window(help, help_lines, &helpwin);
1574 }
1575 
1576 static void
1577 redraw_body(struct tab *tab)
1578 {
1579 	redraw_window(body, body_lines, &tab->window);
1580 }
1581 
1582 static inline char
1583 trust_status_char(enum trust_state ts)
1584 {
1585 	switch (ts) {
1586 	case TS_UNKNOWN:	return 'u';
1587 	case TS_UNTRUSTED:	return '!';
1588 	case TS_TRUSTED:	return 'v';
1589 	case TS_VERIFIED:	return 'V';
1590 	}
1591 }
1592 
1593 static void
1594 redraw_modeline(struct tab *tab)
1595 {
1596 	double		 pct;
1597 	int		 x, y, max_x, max_y;
1598 	const char	*mode = tab->window.page.name;
1599 	const char	*spin = "-\\|/";
1600 
1601 	werase(modeline);
1602 	wattron(modeline, A_REVERSE);
1603 	wmove(modeline, 0, 0);
1604 
1605 	wprintw(modeline, "-%c%c %s ",
1606 	    spin[tab->loading_anim_step],
1607 	    trust_status_char(tab->trust),
1608 	    mode == NULL ? "(none)" : mode);
1609 
1610 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1611 
1612 	if (tab->window.line_max <= (size_t)body_lines)
1613                 wprintw(modeline, "All ");
1614 	else if (tab->window.line_off == 0)
1615                 wprintw(modeline, "Top ");
1616 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1617 		wprintw(modeline, "Bottom ");
1618 	else
1619 		wprintw(modeline, "%.0f%% ", pct);
1620 
1621 	wprintw(modeline, "%d/%d %s ",
1622 	    tab->window.line_off + tab->window.curs_y,
1623 	    tab->window.line_max,
1624 	    tab->hist_cur->h);
1625 
1626 	getyx(modeline, y, x);
1627 	getmaxyx(modeline, max_y, max_x);
1628 
1629 	(void)y;
1630 	(void)max_y;
1631 
1632 	for (; x < max_x; ++x)
1633 		waddstr(modeline, "-");
1634 }
1635 
1636 static void
1637 redraw_minibuffer(void)
1638 {
1639 	struct tab *tab;
1640 	size_t off_y, off_x = 0;
1641 	char *start, *c;
1642 
1643 	werase(minibuf);
1644 
1645 	if (in_minibuffer) {
1646 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1647 		if (ministate.hist_cur != NULL)
1648 			wprintw(minibuf, "(%zu/%zu) ",
1649 			    ministate.hist_off + 1,
1650 			    ministate.history->len);
1651 
1652 		getyx(minibuf, off_y, off_x);
1653 
1654 		start = ministate.hist_cur != NULL
1655 			? ministate.hist_cur->h
1656 			: ministate.buf;
1657 		c = utf8_nth(ministate.window.current_line->line,
1658 		    ministate.window.cpoff);
1659 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1660 			start = utf8_next_cp(start);
1661 		}
1662 
1663 		waddstr(minibuf, start);
1664 	}
1665 
1666 	if (ministate.curmesg != NULL)
1667                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1668 		    ministate.curmesg);
1669 
1670 	if (!in_minibuffer && ministate.curmesg == NULL)
1671 		waddstr(minibuf, keybuf);
1672 
1673 	/* If nothing else, show the URL at point */
1674 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1675 		tab = current_tab();
1676 		if (tab->window.current_line != NULL &&
1677 		    tab->window.current_line->parent->type == LINE_LINK)
1678 			waddstr(minibuf, tab->window.current_line->parent->alt);
1679 	}
1680 
1681 	if (in_minibuffer)
1682 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1683 }
1684 
1685 static void
1686 redraw_tab(struct tab *tab)
1687 {
1688 	if (side_window) {
1689 		redraw_help();
1690 		wnoutrefresh(help);
1691 	}
1692 
1693 	redraw_tabline();
1694 	redraw_body(tab);
1695 	redraw_modeline(tab);
1696 	redraw_minibuffer();
1697 
1698 	wnoutrefresh(tabline);
1699 	wnoutrefresh(modeline);
1700 
1701 	if (in_minibuffer) {
1702 		wnoutrefresh(body);
1703 		wnoutrefresh(minibuf);
1704 	} else {
1705 		wnoutrefresh(minibuf);
1706 		wnoutrefresh(body);
1707 	}
1708 
1709 	doupdate();
1710 }
1711 
1712 static void
1713 emit_help_item(char *prfx, void *fn)
1714 {
1715 	struct line	*l;
1716 	struct cmds	*cmd;
1717 
1718 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1719 		if (fn == cmd->fn)
1720 			break;
1721 	}
1722 	assert(cmd != NULL);
1723 
1724 	if ((l = calloc(1, sizeof(*l))) == NULL)
1725 		abort();
1726 
1727 	l->type = LINE_TEXT;
1728 	l->alt = NULL;
1729 
1730 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1731 
1732 	if (TAILQ_EMPTY(&helpwin.page.head))
1733 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1734 	else
1735 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1736 }
1737 
1738 static void
1739 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1740 {
1741 	struct keymap	*k;
1742 	char		 p[32];
1743 	const char	*kn;
1744 
1745 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1746 		strlcpy(p, prfx, sizeof(p));
1747 		if (*p != '\0')
1748 			strlcat(p, " ", sizeof(p));
1749 		if (k->meta)
1750 			strlcat(p, "M-", sizeof(p));
1751 		if ((kn = unkbd(k->key)) != NULL)
1752 			strlcat(p, kn, sizeof(p));
1753 		else
1754 			strlcat(p, keyname(k->key), sizeof(p));
1755 
1756 		if (k->fn == NULL)
1757 			rec_compute_help(&k->map, p, sizeof(p));
1758 		else
1759 			emit_help_item(p, k->fn);
1760 	}
1761 }
1762 
1763 static void
1764 recompute_help(void)
1765 {
1766 	char	p[32] = { 0 };
1767 
1768 	empty_vlist(&helpwin);
1769 	empty_linelist(&helpwin);
1770 	rec_compute_help(current_map, p, sizeof(p));
1771 	wrap_page(&helpwin, help_cols);
1772 }
1773 
1774 static void
1775 vmessage(const char *fmt, va_list ap)
1776 {
1777 	if (evtimer_pending(&clminibufev, NULL))
1778 		evtimer_del(&clminibufev);
1779 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1780 	evtimer_add(&clminibufev, &clminibufev_timer);
1781 
1782 	free(ministate.curmesg);
1783 
1784 	/* TODO: what to do if the allocation fails here? */
1785 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1786 		ministate.curmesg = NULL;
1787 
1788 	redraw_minibuffer();
1789 	if (in_minibuffer) {
1790 		wrefresh(body);
1791 		wrefresh(minibuf);
1792 	} else {
1793 		wrefresh(minibuf);
1794 		wrefresh(body);
1795 	}
1796 }
1797 
1798 static void
1799 message(const char *fmt, ...)
1800 {
1801 	va_list ap;
1802 
1803 	va_start(ap, fmt);
1804 	vmessage(fmt, ap);
1805 	va_end(ap);
1806 }
1807 
1808 static void
1809 start_loading_anim(struct tab *tab)
1810 {
1811 	if (tab->loading_anim)
1812 		return;
1813 	tab->loading_anim = 1;
1814 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1815 	evtimer_add(&tab->loadingev, &loadingev_timer);
1816 }
1817 
1818 static void
1819 update_loading_anim(int fd, short ev, void *d)
1820 {
1821 	struct tab	*tab = d;
1822 
1823 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1824 
1825 	if (tab->flags & TAB_CURRENT) {
1826 		redraw_modeline(tab);
1827 		wrefresh(modeline);
1828 		wrefresh(body);
1829 		if (in_minibuffer)
1830 			wrefresh(minibuf);
1831 	}
1832 
1833 	evtimer_add(&tab->loadingev, &loadingev_timer);
1834 }
1835 
1836 static void
1837 stop_loading_anim(struct tab *tab)
1838 {
1839 	if (!tab->loading_anim)
1840 		return;
1841 	evtimer_del(&tab->loadingev);
1842 	tab->loading_anim = 0;
1843 	tab->loading_anim_step = 0;
1844 
1845 	if (!(tab->flags & TAB_CURRENT))
1846 		return;
1847 
1848 	redraw_modeline(tab);
1849 
1850 	wrefresh(modeline);
1851 	wrefresh(body);
1852 	if (in_minibuffer)
1853 		wrefresh(minibuf);
1854 }
1855 
1856 static void
1857 load_url_in_tab(struct tab *tab, const char *url)
1858 {
1859 	message("Loading %s...", url);
1860 	start_loading_anim(tab);
1861 	load_url(tab, url);
1862 
1863 	tab->window.curs_x = 0;
1864 	tab->window.curs_y = 0;
1865 	redraw_tab(tab);
1866 }
1867 
1868 static void
1869 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1870     void (*abortfn)(void), struct histhead *hist)
1871 {
1872 	in_minibuffer = 1;
1873 	base_map = &minibuffer_map;
1874 	current_map = &minibuffer_map;
1875 
1876 	base_map->unhandled_input = self_insert_fn;
1877 
1878 	ministate.donefn = donefn;
1879 	ministate.abortfn = abortfn;
1880 	memset(ministate.buf, 0, sizeof(ministate.buf));
1881 	ministate.window.current_line = &ministate.vline;
1882 	ministate.window.current_line->line = ministate.buf;
1883 	ministate.window.cpoff = 0;
1884 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1885 
1886 	ministate.history = hist;
1887 	ministate.hist_cur = NULL;
1888 	ministate.hist_off = 0;
1889 }
1890 
1891 static void
1892 exit_minibuffer(void)
1893 {
1894 	werase(minibuf);
1895 
1896 	in_minibuffer = 0;
1897 	base_map = &global_map;
1898 	current_map = &global_map;
1899 }
1900 
1901 static void
1902 switch_to_tab(struct tab *tab)
1903 {
1904 	struct tab	*t;
1905 
1906 	TAILQ_FOREACH(t, &tabshead, tabs) {
1907 		t->flags &= ~TAB_CURRENT;
1908 	}
1909 
1910 	tab->flags |= TAB_CURRENT;
1911 }
1912 
1913 unsigned int
1914 tab_new_id(void)
1915 {
1916 	return tab_counter++;
1917 }
1918 
1919 static struct tab *
1920 new_tab(const char *url)
1921 {
1922 	struct tab	*tab;
1923 
1924 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1925 		event_loopbreak();
1926 		return NULL;
1927 	}
1928 
1929 	TAILQ_INIT(&tab->hist.head);
1930 
1931 	TAILQ_INIT(&tab->window.head);
1932 
1933 	tab->id = tab_new_id();
1934 	switch_to_tab(tab);
1935 
1936 	if (TAILQ_EMPTY(&tabshead))
1937 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1938 	else
1939 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1940 
1941 	load_url_in_tab(tab, url);
1942 	return tab;
1943 }
1944 
1945 static void
1946 session_new_tab_cb(const char *url)
1947 {
1948 	new_tab(url);
1949 }
1950 
1951 static void
1952 usage(void)
1953 {
1954 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1955 }
1956 
1957 int
1958 ui_init(int argc, char * const *argv)
1959 {
1960 	const char *url = NEW_TAB_URL;
1961 	int ch;
1962 
1963 	while ((ch = getopt(argc, argv, "")) != -1) {
1964 		switch (ch) {
1965 		default:
1966 			usage();
1967 			return 0;
1968 		}
1969 	}
1970 	argc -= optind;
1971 	argv += optind;
1972 
1973 	if (argc != 0)
1974 		url = argv[0];
1975 
1976 	setlocale(LC_ALL, "");
1977 
1978 	TAILQ_INIT(&global_map.m);
1979 	global_map.unhandled_input = global_key_unbound;
1980 
1981 	TAILQ_INIT(&minibuffer_map.m);
1982 
1983 	TAILQ_INIT(&eecmd_history.head);
1984 	TAILQ_INIT(&ir_history.head);
1985 	TAILQ_INIT(&lu_history.head);
1986 
1987 	ministate.line.type = LINE_TEXT;
1988 	ministate.vline.parent = &ministate.line;
1989 	ministate.window.current_line = &ministate.vline;
1990 
1991 	/* initialize help window */
1992 	TAILQ_INIT(&helpwin.head);
1993 
1994 	base_map = &global_map;
1995 	current_map = &global_map;
1996 	load_default_keys();
1997 
1998 	initscr();
1999 	raw();
2000 	noecho();
2001 
2002 	nonl();
2003 	intrflush(stdscr, FALSE);
2004 
2005 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
2006 		return 0;
2007 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
2008 		return 0;
2009 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
2010 		return 0;
2011 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
2012 		return 0;
2013 	if ((help = newwin(1, 1, 1, 0)) == NULL)
2014 		return 0;
2015 
2016 	body_lines = LINES-3;
2017 	body_cols = COLS;
2018 
2019 	keypad(body, TRUE);
2020 	scrollok(body, TRUE);
2021 
2022 	/* non-blocking input */
2023 	wtimeout(body, 0);
2024 
2025 	mvwprintw(body, 0, 0, "");
2026 
2027 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
2028 	event_add(&stdioev, NULL);
2029 
2030 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
2031 	signal_add(&winchev, NULL);
2032 
2033 	load_last_session(session_new_tab_cb);
2034 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
2035 		new_tab(url);
2036 
2037 	return 1;
2038 }
2039 
2040 void
2041 ui_on_tab_loaded(struct tab *tab)
2042 {
2043 	stop_loading_anim(tab);
2044 	message("Loaded %s", tab->hist_cur->h);
2045 
2046 	redraw_tabline();
2047 	wrefresh(tabline);
2048 	if (in_minibuffer)
2049 		wrefresh(minibuf);
2050 	else
2051 		wrefresh(body);
2052 }
2053 
2054 void
2055 ui_on_tab_refresh(struct tab *tab)
2056 {
2057 	wrap_page(&tab->window, body_cols);
2058 	if (tab->flags & TAB_CURRENT) {
2059 		restore_cursor(&tab->window);
2060 		redraw_tab(tab);
2061 	}
2062 }
2063 
2064 void
2065 ui_require_input(struct tab *tab, int hide)
2066 {
2067 	/* TODO: hard-switching to another tab is ugly */
2068 	switch_to_tab(tab);
2069 
2070 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2071 	    &ir_history);
2072 	strlcpy(ministate.prompt, "Input required: ",
2073 	    sizeof(ministate.prompt));
2074 	redraw_tab(tab);
2075 }
2076 
2077 void
2078 ui_yornp(const char *prompt, void (*fn)(int, unsigned int),
2079     unsigned int data)
2080 {
2081 	size_t len;
2082 
2083 	if (in_minibuffer) {
2084 		fn(0, data);
2085 		return;
2086 	}
2087 
2088 	yornp_cb = fn;
2089 	yornp_data = data;
2090 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2091 	    yornp_abort, NULL);
2092 
2093 	len = sizeof(ministate.prompt);
2094 	strlcpy(ministate.prompt, prompt, len);
2095 	strlcat(ministate.prompt, " (y or n) ", len);
2096 	redraw_tab(current_tab());
2097 }
2098 
2099 void
2100 ui_notify(const char *fmt, ...)
2101 {
2102 	va_list ap;
2103 
2104 	va_start(ap, fmt);
2105 	vmessage(fmt, ap);
2106 	va_end(ap);
2107 }
2108 
2109 void
2110 ui_end(void)
2111 {
2112 	endwin();
2113 }