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Date:: Fri May 14 10:10:58 2021 UTC
Message:: moved commands def to their own file and made the cmd_* functions public
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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 #include "cmd.gen.h"
37 
38 #include <assert.h>
39 #include <curses.h>
40 #include <event.h>
41 #include <locale.h>
42 #include <signal.h>
43 #include <stdarg.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47 
48 #define TAB_CURRENT	0x1
49 #define TAB_URGENT	0x2
50 
51 #define NEW_TAB_URL	"about:new"
52 
53 static struct event	stdioev, winchev;
54 
55 static void		 load_default_keys(void);
56 static void		 restore_cursor(struct window*);
57 
58 static void		 global_key_unbound(void);
59 static void		 minibuffer_hist_save_entry(void);
60 static void		 minibuffer_taint_hist(void);
61 static void		 minibuffer_self_insert(void);
62 static void		 eecmd_self_insert(void);
63 static void		 eecmd_select(void);
64 static void		 ir_self_insert(void);
65 static void		 ir_select(void);
66 static void		 lu_self_insert(void);
67 static void		 lu_select(void);
68 static void		 bp_select(void);
69 static void		 yornp_self_insert(void);
70 static void		 yornp_abort(void);
71 
72 static struct vline	*nth_line(struct window*, size_t);
73 static struct tab	*current_tab(void);
74 static struct window	*current_window(void);
75 static int		 readkey(void);
76 static void		 dispatch_stdio(int, short, void*);
77 static void		 handle_clear_minibuf(int, short, void*);
78 static void		 handle_resize(int, short, void*);
79 static void		 handle_resize_timeout(int, short, void*);
80 static int		 wrap_page(struct window*, int);
81 static void		 print_vline(WINDOW*, struct vline*);
82 static void		 redraw_tabline(void);
83 static void		 redraw_window(WINDOW*, int, struct window*);
84 static void		 redraw_help(void);
85 static void		 redraw_body(struct tab*);
86 static void		 redraw_modeline(struct tab*);
87 static void		 redraw_minibuffer(void);
88 static void		 redraw_tab(struct tab*);
89 static void		 emit_help_item(char*, void*);
90 static void		 rec_compute_help(struct kmap*, char*, size_t);
91 static void		 recompute_help(void);
92 static void		 vmessage(const char*, va_list);
93 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
94 static void		 start_loading_anim(struct tab*);
95 static void		 update_loading_anim(int, short, void*);
96 static void		 stop_loading_anim(struct tab*);
97 static void		 load_url_in_tab(struct tab*, const char*);
98 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
99 static void		 exit_minibuffer(void);
100 static void		 switch_to_tab(struct tab*);
101 static struct tab	*new_tab(const char*);
102 static void		 session_new_tab_cb(const char*);
103 static void		 usage(void);
104 
105 static struct { short meta; int key; uint32_t cp; } thiskey;
106 
107 static struct event	resizeev;
108 static struct timeval	resize_timer = { 0, 250000 };
109 
110 static WINDOW	*tabline, *body, *modeline, *minibuf;
111 static int	 body_lines, body_cols;
112 
113 static WINDOW		*help;
114 static struct window	 helpwin;
115 static int		 help_lines, help_cols;
116 
117 static int		 side_window;
118 
119 static struct event	clminibufev;
120 static struct timeval	clminibufev_timer = { 5, 0 };
121 static struct timeval	loadingev_timer = { 0, 250000 };
122 
123 static uint32_t		 tab_counter;
124 
125 static char	keybuf[64];
126 
127 static void (*yornp_cb)(int, unsigned int);
128 static unsigned int yornp_data;
129 
130 struct kmap global_map,
131 	minibuffer_map,
132 	*current_map,
133 	*base_map;
134 
135 static struct histhead eecmd_history,
136 	ir_history,
137 	lu_history;
138 
139 static int	in_minibuffer;
140 
141 static struct {
142 	char		*curmesg;
143 
144 	char		 prompt[64];
145 	void		 (*donefn)(void);
146 	void		 (*abortfn)(void);
147 
148 	char		 buf[1025];
149 	struct line	 line;
150 	struct vline	 vline;
151 	struct window	 window;
152 
153 	struct histhead	*history;
154 	struct hist	*hist_cur;
155 	size_t		 hist_off;
156 } ministate;
157 
158 struct lineprefix {
159 	const char	*prfx1;
160 	const char	*prfx2;
161 } line_prefixes[] = {
162 	[LINE_TEXT] =		{ "",		"" },
163 	[LINE_LINK] =		{ "=> ",	"   " },
164 	[LINE_TITLE_1] =	{ "# ",		"  " },
165 	[LINE_TITLE_2] =	{ "## ",	"   " },
166 	[LINE_TITLE_3] =	{ "### ",	"    " },
167 	[LINE_ITEM] =		{ "* ",		"  " },
168 	[LINE_QUOTE] =		{ "> ",		"  " },
169 	[LINE_PRE_START] =	{ "```",	"   " },
170 	[LINE_PRE_CONTENT] =	{ "",		"" },
171 	[LINE_PRE_END] =	{ "```",	"```" },
172 };
173 
174 static struct line_face {
175 	int prefix_prop;
176 	int text_prop;
177 } line_faces[] = {
178 	[LINE_TEXT] =		{ 0,		0 },
179 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
180 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
181 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
182 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
183 	[LINE_ITEM] =		{ 0,		0 },
184 	[LINE_QUOTE] =		{ 0,		A_DIM },
185 	[LINE_PRE_START] =	{ 0,		0 },
186 	[LINE_PRE_CONTENT] =	{ 0,		0 },
187 	[LINE_PRE_END] =	{ 0,		0 },
188 };
189 
190 static struct tab_face {
191 	int background, tab, current_tab;
192 } tab_face = {
193 	A_REVERSE, A_REVERSE, A_NORMAL
194 };
195 
196 static inline void
197 global_set_key(const char *key, void (*fn)(struct window*))
198 {
199 	if (!kmap_define_key(&global_map, key, fn))
200 		_exit(1);
201 }
202 
203 static inline void
204 minibuffer_set_key(const char *key, void (*fn)(struct window*))
205 {
206 	if (!kmap_define_key(&minibuffer_map, key, fn))
207 		_exit(1);
208 }
209 
210 static void
211 load_default_keys(void)
212 {
213 	/* === global map === */
214 
215 	/* emacs */
216 	global_set_key("C-p",		cmd_previous_line);
217 	global_set_key("C-n",		cmd_next_line);
218 	global_set_key("C-f",		cmd_forward_char);
219 	global_set_key("C-b",		cmd_backward_char);
220 	global_set_key("M-{",		cmd_backward_paragraph);
221 	global_set_key("M-}",		cmd_forward_paragraph);
222 	global_set_key("C-a",		cmd_move_beginning_of_line);
223 	global_set_key("C-e",		cmd_move_end_of_line);
224 
225 	global_set_key("M-v",		cmd_scroll_up);
226 	global_set_key("C-v",		cmd_scroll_down);
227 	global_set_key("M-space",	cmd_scroll_up);
228 	global_set_key("space",		cmd_scroll_down);
229 
230 	global_set_key("M-<",		cmd_beginning_of_buffer);
231 	global_set_key("M->",		cmd_end_of_buffer);
232 
233 	global_set_key("C-x C-c",	cmd_kill_telescope);
234 
235 	global_set_key("C-g",		cmd_clear_minibuf);
236 
237 	global_set_key("M-x",		cmd_execute_extended_command);
238 	global_set_key("C-x C-f",	cmd_load_url);
239 	global_set_key("C-x M-f",	cmd_load_current_url);
240 
241 	global_set_key("C-x t 0",	cmd_tab_close);
242 	global_set_key("C-x t 1",	cmd_tab_close_other);
243 	global_set_key("C-x t 2",	cmd_tab_new);
244 	global_set_key("C-x t o",	cmd_tab_next);
245 	global_set_key("C-x t O",	cmd_tab_previous);
246 	global_set_key("C-x t m",	cmd_tab_move);
247 	global_set_key("C-x t M",	cmd_tab_move_to);
248 
249 	global_set_key("C-M-b",		cmd_previous_page);
250 	global_set_key("C-M-f",		cmd_next_page);
251 
252 	global_set_key("<f7> a",	cmd_bookmark_page);
253 	global_set_key("<f7> <f7>",	cmd_list_bookmarks);
254 
255 	/* vi/vi-like */
256 	global_set_key("k",		cmd_previous_line);
257 	global_set_key("j",		cmd_next_line);
258 	global_set_key("l",		cmd_forward_char);
259 	global_set_key("h",		cmd_backward_char);
260 	global_set_key("{",		cmd_backward_paragraph);
261 	global_set_key("}",		cmd_forward_paragraph);
262 	global_set_key("^",		cmd_move_beginning_of_line);
263 	global_set_key("$",		cmd_move_end_of_line);
264 
265 	global_set_key("K",		cmd_scroll_line_up);
266 	global_set_key("J",		cmd_scroll_line_down);
267 
268 	global_set_key("g g",		cmd_beginning_of_buffer);
269 	global_set_key("G",		cmd_end_of_buffer);
270 
271 	global_set_key("g D",		cmd_tab_close);
272 	global_set_key("g N",		cmd_tab_new);
273 	global_set_key("g t",		cmd_tab_next);
274 	global_set_key("g T",		cmd_tab_previous);
275 	global_set_key("g M-t",		cmd_tab_move);
276 	global_set_key("g M-T",		cmd_tab_move_to);
277 
278 	global_set_key("H",		cmd_previous_page);
279 	global_set_key("L",		cmd_next_page);
280 
281 	/* tmp */
282 	global_set_key("q",		cmd_kill_telescope);
283 
284 	global_set_key("esc",		cmd_clear_minibuf);
285 
286 	global_set_key(":",		cmd_execute_extended_command);
287 
288 	/* cua */
289 	global_set_key("<up>",		cmd_previous_line);
290 	global_set_key("<down>",	cmd_next_line);
291 	global_set_key("<right>",	cmd_forward_char);
292 	global_set_key("<left>",	cmd_backward_char);
293 	global_set_key("<prior>",	cmd_scroll_up);
294 	global_set_key("<next>",	cmd_scroll_down);
295 
296 	global_set_key("M-<left>",	cmd_previous_page);
297 	global_set_key("M-<right>",	cmd_next_page);
298 
299 	/* "ncurses standard" */
300 	global_set_key("C-l",		cmd_redraw);
301 
302 	/* global */
303 	global_set_key("<f1>",		cmd_toggle_help);
304 	global_set_key("C-m",		cmd_push_button);
305 	global_set_key("M-enter",	cmd_push_button_new_tab);
306 	global_set_key("M-tab",		cmd_previous_button);
307 	global_set_key("tab",		cmd_next_button);
308 
309 	/* === minibuffer map === */
310 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
311 	minibuffer_set_key("C-g",		cmd_mini_abort);
312 	minibuffer_set_key("esc",		cmd_mini_abort);
313 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
314 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
315 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
316 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
317 
318 	minibuffer_set_key("C-b",		cmd_backward_char);
319 	minibuffer_set_key("C-f",		cmd_forward_char);
320 	minibuffer_set_key("<left>",		cmd_backward_char);
321 	minibuffer_set_key("<right>",		cmd_forward_char);
322 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
323 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
324 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
325 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
326 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
327 
328 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
329 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
330 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
331 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
332 }
333 
334 static void
335 restore_cursor(struct window *window)
336 {
337 	struct vline	*vl;
338 	const char	*prfx;
339 
340 	vl = window->current_line;
341 	if (vl == NULL || vl->line == NULL)
342 		window->curs_x = window->cpoff = 0;
343 	else
344 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
345 
346 	if (vl != NULL) {
347 		prfx = line_prefixes[vl->parent->type].prfx1;
348 		window->curs_x += utf8_swidth(prfx);
349 	}
350 }
351 
352 void
353 cmd_previous_line(struct window *window)
354 {
355 	struct vline	*vl;
356 
357 	if (window->current_line == NULL
358 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
359 		return;
360 
361 	if (--window->curs_y < 0) {
362 		window->curs_y = 0;
363 		cmd_scroll_line_up(window);
364 		return;
365 	}
366 
367 	window->current_line = vl;
368 	restore_cursor(window);
369 }
370 
371 void
372 cmd_next_line(struct window *window)
373 {
374 	struct vline	*vl;
375 
376 	if (window->current_line == NULL
377 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
378 		return;
379 
380 	if (++window->curs_y > body_lines-1) {
381 		window->curs_y = body_lines-1;
382 		cmd_scroll_line_down(window);
383 		return;
384 	}
385 
386 	window->current_line = vl;
387 	restore_cursor(window);
388 }
389 
390 void
391 cmd_backward_char(struct window *window)
392 {
393 	if (window->cpoff != 0)
394 		window->cpoff--;
395 	restore_cursor(window);
396 }
397 
398 void
399 cmd_forward_char(struct window *window)
400 {
401 	size_t len = 0;
402 
403 	if (window->current_line->line != NULL)
404 		len = utf8_cplen(window->current_line->line);
405 	if (++window->cpoff > len)
406 		window->cpoff = len;
407 	restore_cursor(window);
408 }
409 
410 void
411 cmd_backward_paragraph(struct window *window)
412 {
413 	do {
414 		if (window->current_line == NULL ||
415 		    window->current_line == TAILQ_FIRST(&window->head)) {
416 			message("No previous paragraph");
417 			return;
418 		}
419 		cmd_previous_line(window);
420 	} while (window->current_line->line != NULL ||
421 	    window->current_line->parent->type != LINE_TEXT);
422 }
423 
424 void
425 cmd_forward_paragraph(struct window *window)
426 {
427 	do {
428 		if (window->current_line == NULL ||
429 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
430 			message("No next paragraph");
431 			return;
432 		}
433 		cmd_next_line(window);
434 	} while (window->current_line->line != NULL ||
435 	    window->current_line->parent->type != LINE_TEXT);
436 }
437 
438 void
439 cmd_move_beginning_of_line(struct window *window)
440 {
441 	window->cpoff = 0;
442 	restore_cursor(window);
443 }
444 
445 void
446 cmd_move_end_of_line(struct window *window)
447 {
448 	struct vline	*vl;
449 
450 	vl = window->current_line;
451 	if (vl->line == NULL)
452 		return;
453 	window->cpoff = utf8_cplen(vl->line);
454 	restore_cursor(window);
455 }
456 
457 void
458 cmd_redraw(struct window *window)
459 {
460 	handle_resize(0, 0, NULL);
461 }
462 
463 void
464 cmd_scroll_line_up(struct window *window)
465 {
466 	struct vline	*vl;
467 
468 	if (window->line_off == 0)
469 		return;
470 
471 	vl = nth_line(window, --window->line_off);
472 	wscrl(body, -1);
473 	wmove(body, 0, 0);
474 	print_vline(body, vl);
475 
476 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
477 	restore_cursor(window);
478 }
479 
480 void
481 cmd_scroll_line_down(struct window *window)
482 {
483 	struct vline	*vl;
484 
485 	vl = window->current_line;
486 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
487 		return;
488 	window->current_line = vl;
489 
490 	window->line_off++;
491 	wscrl(body, 1);
492 
493 	if (window->line_max - window->line_off < (size_t)body_lines)
494 		return;
495 
496 	vl = nth_line(window, window->line_off + body_lines-1);
497 	wmove(body, body_lines-1, 0);
498 	print_vline(body, vl);
499 
500 	restore_cursor(window);
501 }
502 
503 void
504 cmd_scroll_up(struct window *window)
505 {
506 	size_t off;
507 
508 	off = body_lines-1;
509 
510 	for (; off > 0; --off)
511 		cmd_scroll_line_up(window);
512 }
513 
514 void
515 cmd_scroll_down(struct window *window)
516 {
517 	size_t off;
518 
519 	off = body_lines-1;
520 
521 	for (; off > 0; --off)
522 		cmd_scroll_line_down(window);
523 }
524 
525 void
526 cmd_beginning_of_buffer(struct window *window)
527 {
528 	window->current_line = TAILQ_FIRST(&window->head);
529 	window->line_off = 0;
530 	window->curs_y = 0;
531 	window->cpoff = 0;
532 	restore_cursor(window);
533 }
534 
535 void
536 cmd_end_of_buffer(struct window *window)
537 {
538 	ssize_t off;
539 
540 	off = window->line_max - body_lines;
541 	off = MAX(0, off);
542 
543 	window->line_off = off;
544 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
545 
546 	window->current_line = TAILQ_LAST(&window->head, vhead);
547 	window->cpoff = body_cols;
548 	restore_cursor(window);
549 }
550 
551 void
552 cmd_kill_telescope(struct window *window)
553 {
554 	save_session();
555 	event_loopbreak();
556 }
557 
558 void
559 cmd_push_button(struct window *window)
560 {
561 	struct vline	*vl;
562 	size_t		 nth;
563 
564 	nth = window->line_off + window->curs_y;
565 	if (nth >= window->line_max)
566 		return;
567 	vl = nth_line(window, nth);
568 	if (vl->parent->type != LINE_LINK)
569 		return;
570 
571 	load_url_in_tab(current_tab(), vl->parent->alt);
572 }
573 
574 void
575 cmd_push_button_new_tab(struct window *window)
576 {
577 	struct vline	*vl;
578 	size_t		 nth;
579 
580 	nth = window->line_off + window->curs_y;
581 	if (nth > window->line_max)
582 		return;
583 	vl = nth_line(window, nth);
584 	if (vl->parent->type != LINE_LINK)
585 		return;
586 
587 	new_tab(vl->parent->alt);
588 }
589 
590 void
591 cmd_previous_button(struct window *window)
592 {
593 	do {
594 		if (window->current_line == NULL ||
595 		    window->current_line == TAILQ_FIRST(&window->head)) {
596 			message("No previous link");
597 			return;
598 		}
599 		cmd_previous_line(window);
600 	} while (window->current_line->parent->type != LINE_LINK);
601 }
602 
603 void
604 cmd_next_button(struct window *window)
605 {
606 	do {
607 		if (window->current_line == NULL ||
608 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
609 			message("No next link");
610 			return;
611 		}
612 		cmd_next_line(window);
613 	} while (window->current_line->parent->type != LINE_LINK);
614 }
615 
616 void
617 cmd_previous_page(struct window *window)
618 {
619 	struct tab *tab = current_tab();
620 
621 	if (!load_previous_page(tab))
622 		message("No previous page");
623 	else
624 		start_loading_anim(tab);
625 }
626 
627 void
628 cmd_next_page(struct window *window)
629 {
630 	struct tab *tab = current_tab();
631 
632 	if (!load_next_page(tab))
633 		message("No next page");
634 	else
635 		start_loading_anim(tab);
636 }
637 
638 void
639 cmd_clear_minibuf(struct window *window)
640 {
641 	handle_clear_minibuf(0, 0, NULL);
642 }
643 
644 void
645 cmd_execute_extended_command(struct window *window)
646 {
647 	size_t	 len;
648 
649 	if (in_minibuffer) {
650 		message("We don't have enable-recursive-minibuffers");
651 		return;
652 	}
653 
654 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
655 	    &eecmd_history);
656 
657 	len = sizeof(ministate.prompt);
658 	strlcpy(ministate.prompt, "", len);
659 
660 	if (thiskey.meta)
661 		strlcat(ministate.prompt, "M-", len);
662 
663 	strlcat(ministate.prompt, keyname(thiskey.key), len);
664 
665 	if (thiskey.meta)
666 		strlcat(ministate.prompt, " ", len);
667 }
668 
669 void
670 cmd_tab_close(struct window *window)
671 {
672 	struct tab *tab, *t;
673 
674 	tab = current_tab();
675 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
676 	    TAILQ_NEXT(tab, tabs) == NULL) {
677 		message("Can't close the only tab.");
678 		return;
679 	}
680 
681 	if (evtimer_pending(&tab->loadingev, NULL))
682 		evtimer_del(&tab->loadingev);
683 
684 	stop_tab(tab);
685 
686 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
687 		t = TAILQ_NEXT(tab, tabs);
688 	TAILQ_REMOVE(&tabshead, tab, tabs);
689 	free(tab);
690 
691 	switch_to_tab(t);
692 }
693 
694 void
695 cmd_tab_close_other(struct window *window)
696 {
697 	struct tab *t, *i;
698 
699 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
700 		if (t->flags & TAB_CURRENT)
701 			continue;
702 
703 		stop_tab(t);
704 		TAILQ_REMOVE(&tabshead, t, tabs);
705 		free(t);
706 	}
707 }
708 
709 void
710 cmd_tab_new(struct window *window)
711 {
712 	new_tab(NEW_TAB_URL);
713 }
714 
715 void
716 cmd_tab_next(struct window *window)
717 {
718 	struct tab *tab, *t;
719 
720 	tab = current_tab();
721 	tab->flags &= ~TAB_CURRENT;
722 
723 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
724 		t = TAILQ_FIRST(&tabshead);
725 	t->flags |= TAB_CURRENT;
726 	t->flags &= ~TAB_URGENT;
727 }
728 
729 void
730 cmd_tab_previous(struct window *window)
731 {
732 	struct tab *tab, *t;
733 
734 	tab = current_tab();
735 	tab->flags &= ~TAB_CURRENT;
736 
737 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
738 		t = TAILQ_LAST(&tabshead, tabshead);
739 	t->flags |= TAB_CURRENT;
740 	t->flags &= ~TAB_URGENT;
741 }
742 
743 void
744 cmd_tab_move(struct window *window)
745 {
746 	struct tab *tab, *t;
747 
748 	tab = current_tab();
749 	t = TAILQ_NEXT(tab, tabs);
750 	TAILQ_REMOVE(&tabshead, tab, tabs);
751 
752 	if (t == NULL)
753 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
754 	else
755 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
756 }
757 
758 void
759 cmd_tab_move_to(struct window *window)
760 {
761 	struct tab *tab, *t;
762 
763 	tab = current_tab();
764 	t = TAILQ_PREV(tab, tabshead, tabs);
765 	TAILQ_REMOVE(&tabshead, tab, tabs);
766 
767 	if (t == NULL) {
768 		if (TAILQ_EMPTY(&tabshead))
769 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
770 		else
771 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
772 	} else
773 		TAILQ_INSERT_BEFORE(t, tab, tabs);
774 }
775 
776 void
777 cmd_load_url(struct window *window)
778 {
779 	if (in_minibuffer) {
780 		message("We don't have enable-recursive-minibuffers");
781 		return;
782 	}
783 
784 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
785 	    &lu_history);
786 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
787 	strlcpy(ministate.buf, "gemini://", sizeof(ministate.buf));
788 	cmd_move_end_of_line(&ministate.window);
789 }
790 
791 void
792 cmd_load_current_url(struct window *window)
793 {
794 	struct tab *tab = current_tab();
795 
796 	if (in_minibuffer) {
797 		message("We don't have enable-recursive-minibuffers");
798 		return;
799 	}
800 
801 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
802 	    &lu_history);
803 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
804 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
805 	ministate.window.cpoff = utf8_cplen(ministate.buf);
806 }
807 
808 void
809 cmd_bookmark_page(struct window *window)
810 {
811 	struct tab *tab = current_tab();
812 
813 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
814 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
815 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
816 	ministate.window.cpoff = utf8_cplen(ministate.buf);
817 }
818 
819 void
820 cmd_list_bookmarks(struct window *window)
821 {
822 	load_url_in_tab(current_tab(), "about:bookmarks");
823 }
824 
825 void
826 cmd_toggle_help(struct window *window)
827 {
828 	side_window = !side_window;
829 	if (side_window)
830 		recompute_help();
831 
832 	/*
833 	 * ugly hack, but otherwise the window doesn't get updated
834 	 * until I call handle_resize a second time (i.e. C-l).  I
835 	 * will be happy to know why something like this is needed.
836 	 */
837 	handle_resize(0, 0, NULL);
838 	handle_resize(0, 0, NULL);
839 }
840 
841 void
842 cmd_mini_delete_char(struct window *window)
843 {
844 	char *c, *n;
845 
846 	if (!in_minibuffer) {
847 		message("text is read-only");
848 		return;
849 	}
850 
851 	minibuffer_taint_hist();
852 
853 	c = utf8_nth(window->current_line->line, window->cpoff);
854 	if (*c == '\0')
855 		return;
856 	n = utf8_next_cp(c);
857 
858 	memmove(c, n, strlen(n)+1);
859 }
860 
861 void
862 cmd_mini_delete_backward_char(struct window *window)
863 {
864 	char *c, *p, *start;
865 
866 	if (!in_minibuffer) {
867 		message("text is read-only");
868 		return;
869 	}
870 
871 	minibuffer_taint_hist();
872 
873 	c = utf8_nth(window->current_line->line, window->cpoff);
874 	start = window->current_line->line;
875 	if (c == start)
876 		return;
877 	p = utf8_prev_cp(c-1, start);
878 
879 	memmove(p, c, strlen(c)+1);
880 	window->cpoff--;
881 }
882 
883 void
884 cmd_mini_kill_line(struct window *window)
885 {
886 	char *c;
887 
888 	if (!in_minibuffer) {
889 		message("text is read-only");
890 		return;
891 	}
892 
893 	minibuffer_taint_hist();
894 	c = utf8_nth(window->current_line->line, window->cpoff);
895 	*c = '\0';
896 }
897 
898 void
899 cmd_mini_abort(struct window *window)
900 {
901 	if (!in_minibuffer)
902 		return;
903 
904 	ministate.abortfn();
905 }
906 
907 void
908 cmd_mini_complete_and_exit(struct window *window)
909 {
910 	if (!in_minibuffer)
911 		return;
912 
913 	minibuffer_taint_hist();
914 	ministate.donefn();
915 }
916 
917 void
918 cmd_mini_previous_history_element(struct window *window)
919 {
920 	if (ministate.history == NULL) {
921 		message("No history");
922 		return;
923 	}
924 
925 	if (ministate.hist_cur == NULL ||
926 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
927 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
928 		ministate.hist_off = ministate.history->len - 1;
929 		if (ministate.hist_cur == NULL)
930 			message("No prev item");
931 	} else {
932 		ministate.hist_off--;
933 	}
934 
935 	if (ministate.hist_cur != NULL)
936 		window->current_line->line = ministate.hist_cur->h;
937 }
938 
939 void
940 cmd_mini_next_history_element(struct window *window)
941 {
942 	if (ministate.history == NULL) {
943 		message("No history");
944 		return;
945 	}
946 
947 	if (ministate.hist_cur == NULL ||
948 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
949 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
950 		ministate.hist_off = 0;
951 		if (ministate.hist_cur == NULL)
952 			message("No next item");
953 	} else {
954 		ministate.hist_off++;
955 	}
956 
957 	if (ministate.hist_cur != NULL)
958 		window->current_line->line = ministate.hist_cur->h;
959 }
960 
961 static void
962 global_key_unbound(void)
963 {
964 	message("%s is undefined", keybuf);
965 }
966 
967 static void
968 minibuffer_hist_save_entry(void)
969 {
970 	struct hist	*hist;
971 
972 	if (ministate.history == NULL)
973 		return;
974 
975 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
976 		abort();
977 
978 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
979 
980 	if (TAILQ_EMPTY(&ministate.history->head))
981 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
982 	else
983 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
984 	ministate.history->len++;
985 }
986 
987 /*
988  * taint the minibuffer cache: if we're currently showing a history
989  * element, copy that to the current buf and reset the "history
990  * navigation" thing.
991  */
992 static void
993 minibuffer_taint_hist(void)
994 {
995 	if (ministate.hist_cur == NULL)
996 		return;
997 
998 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
999 	ministate.hist_cur = NULL;
1000 }
1001 
1002 static void
1003 minibuffer_self_insert(void)
1004 {
1005 	char	*c, tmp[5] = {0};
1006 	size_t	len;
1007 
1008 	minibuffer_taint_hist();
1009 
1010 	if (thiskey.cp == 0)
1011 		return;
1012 
1013 	len = utf8_encode(thiskey.cp, tmp);
1014 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1015 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1016 		return;
1017 
1018 	memmove(c + len, c, strlen(c)+1);
1019 	memcpy(c, tmp, len);
1020 	ministate.window.cpoff++;
1021 }
1022 
1023 static void
1024 eecmd_self_insert(void)
1025 {
1026 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1027 	    !unicode_isgraph(thiskey.cp)) {
1028 		global_key_unbound();
1029 		return;
1030 	}
1031 
1032 	minibuffer_self_insert();
1033 }
1034 
1035 static void
1036 eecmd_select(void)
1037 {
1038 	struct cmds *cmd;
1039 
1040 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1041 		if (!strcmp(cmd->cmd, ministate.buf)) {
1042 			exit_minibuffer();
1043 			minibuffer_hist_save_entry();
1044 			cmd->fn(current_window());
1045 			return;
1046 		}
1047 	}
1048 
1049 	message("No match");
1050 }
1051 
1052 static void
1053 ir_self_insert(void)
1054 {
1055 	minibuffer_self_insert();
1056 }
1057 
1058 static void
1059 ir_select(void)
1060 {
1061 	char		 buf[1025] = {0};
1062 	struct phos_uri	 uri;
1063 	struct tab	*tab;
1064 
1065 	tab = current_tab();
1066 
1067 	exit_minibuffer();
1068 	minibuffer_hist_save_entry();
1069 
1070 	/* a bit ugly but... */
1071 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
1072 	phos_uri_set_query(&uri, ministate.buf);
1073 	phos_serialize_uri(&uri, buf, sizeof(buf));
1074 	load_url_in_tab(tab, buf);
1075 }
1076 
1077 static void
1078 lu_self_insert(void)
1079 {
1080 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1081 	    !unicode_isgraph(thiskey.key)) {
1082 		global_key_unbound();
1083 		return;
1084 	}
1085 
1086 	minibuffer_self_insert();
1087 }
1088 
1089 static void
1090 lu_select(void)
1091 {
1092 	exit_minibuffer();
1093 	minibuffer_hist_save_entry();
1094 	load_url_in_tab(current_tab(), ministate.buf);
1095 }
1096 
1097 static void
1098 bp_select(void)
1099 {
1100 	exit_minibuffer();
1101 	if (*ministate.buf != '\0')
1102 		add_to_bookmarks(ministate.buf);
1103 	else
1104 		message("Abort.");
1105 }
1106 
1107 static void
1108 yornp_self_insert(void)
1109 {
1110 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1111 		message("Please answer y or n");
1112 		return;
1113 	}
1114 
1115 	exit_minibuffer();
1116 	yornp_cb(thiskey.key == 'y', yornp_data);
1117 }
1118 
1119 static void
1120 yornp_abort(void)
1121 {
1122 	exit_minibuffer();
1123 	yornp_cb(0, yornp_data);
1124 }
1125 
1126 static struct vline *
1127 nth_line(struct window *window, size_t n)
1128 {
1129 	struct vline	*vl;
1130 	size_t		 i;
1131 
1132 	i = 0;
1133 	TAILQ_FOREACH(vl, &window->head, vlines) {
1134 		if (i == n)
1135 			return vl;
1136 		i++;
1137 	}
1138 
1139 	/* unreachable */
1140 	abort();
1141 }
1142 
1143 static struct tab *
1144 current_tab(void)
1145 {
1146 	struct tab *t;
1147 
1148 	TAILQ_FOREACH(t, &tabshead, tabs) {
1149 		if (t->flags & TAB_CURRENT)
1150 			return t;
1151 	}
1152 
1153 	/* unreachable */
1154 	abort();
1155 }
1156 
1157 static struct window *
1158 current_window(void)
1159 {
1160 	if (in_minibuffer)
1161 		return &ministate.window;
1162 	return &current_tab()->window;
1163 }
1164 
1165 static int
1166 readkey(void)
1167 {
1168 	uint32_t state = 0;
1169 
1170 	if ((thiskey.key = wgetch(body)) == ERR)
1171 		return 0;
1172 
1173 	thiskey.meta = thiskey.key == 27;
1174 	if (thiskey.meta) {
1175 		thiskey.key = wgetch(body);
1176 		if (thiskey.key == ERR || thiskey.key == 27) {
1177 			thiskey.meta = 0;
1178 			thiskey.key = 27;
1179 		}
1180 	}
1181 
1182 	thiskey.cp = 0;
1183 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1184 		while (1) {
1185 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1186 				break;
1187 			if ((thiskey.key = wgetch(body)) == ERR) {
1188 				message("Error decoding user input");
1189 				return 0;
1190 			}
1191 		}
1192 	}
1193 
1194 	return 1;
1195 }
1196 
1197 static void
1198 dispatch_stdio(int fd, short ev, void *d)
1199 {
1200 	struct keymap	*k;
1201 	const char	*keyname;
1202 	char		 tmp[5] = {0};
1203 
1204 	if (!readkey())
1205 		return;
1206 
1207 	if (keybuf[0] != '\0')
1208 		strlcat(keybuf, " ", sizeof(keybuf));
1209 	if (thiskey.meta)
1210 		strlcat(keybuf, "M-", sizeof(keybuf));
1211 	if (thiskey.cp != 0) {
1212 		utf8_encode(thiskey.cp, tmp);
1213 		strlcat(keybuf, tmp, sizeof(keybuf));
1214 	} else {
1215 		if ((keyname = unkbd(thiskey.key)) != NULL)
1216 			strlcat(keybuf, keyname, sizeof(keybuf));
1217 		else {
1218 			tmp[0] = thiskey.key;
1219 			strlcat(keybuf, tmp, sizeof(keybuf));
1220 		}
1221 	}
1222 
1223 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1224 		if (k->meta == thiskey.meta &&
1225 		    k->key == thiskey.key) {
1226 			if (k->fn == NULL)
1227 				current_map = &k->map;
1228 			else {
1229 				current_map = base_map;
1230 				strlcpy(keybuf, "", sizeof(keybuf));
1231 				k->fn(current_window());
1232 			}
1233 			goto done;
1234 		}
1235 	}
1236 
1237 	if (current_map->unhandled_input != NULL)
1238 		current_map->unhandled_input();
1239 	else {
1240 		global_key_unbound();
1241 	}
1242 
1243 	strlcpy(keybuf, "", sizeof(keybuf));
1244 	current_map = base_map;
1245 
1246 done:
1247 	if (side_window)
1248 		recompute_help();
1249 
1250 	redraw_tab(current_tab());
1251 }
1252 
1253 static void
1254 handle_clear_minibuf(int fd, short ev, void *d)
1255 {
1256 	free(ministate.curmesg);
1257 	ministate.curmesg = NULL;
1258 
1259 	redraw_minibuffer();
1260 	if (in_minibuffer) {
1261 		wrefresh(body);
1262 		wrefresh(minibuf);
1263 	} else {
1264 		wrefresh(minibuf);
1265 		wrefresh(body);
1266 	}
1267 }
1268 
1269 static void
1270 handle_resize(int sig, short ev, void *d)
1271 {
1272 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
1273 		event_del(&resizeev);
1274 	}
1275 	evtimer_set(&resizeev, handle_resize_timeout, NULL);
1276 	evtimer_add(&resizeev, &resize_timer);
1277 }
1278 
1279 static void
1280 handle_resize_timeout(int s, short ev, void *d)
1281 {
1282 	struct tab	*tab;
1283 
1284 	endwin();
1285 	refresh();
1286 	clear();
1287 
1288 	/* move and resize the windows, in reverse order! */
1289 
1290 	mvwin(minibuf, LINES-1, 0);
1291 	wresize(minibuf, 1, COLS);
1292 
1293 	mvwin(modeline, LINES-2, 0);
1294 	wresize(modeline, 1, COLS);
1295 
1296 	body_lines = LINES-3;
1297 	body_cols = COLS;
1298 
1299 	if (side_window) {
1300 		help_cols = 0.3 * COLS;
1301 		help_lines = LINES-3;
1302 		mvwin(help, 1, 0);
1303 		wresize(help, help_lines, help_cols);
1304 
1305 		wrap_page(&helpwin, help_cols);
1306 
1307 		body_cols = COLS - help_cols - 1;
1308 		mvwin(body, 1, help_cols);
1309 	} else
1310 		mvwin(body, 1, 0);
1311 
1312 	wresize(body, body_lines, body_cols);
1313 
1314 	wresize(tabline, 1, COLS);
1315 
1316 	tab = current_tab();
1317 
1318 	wrap_page(&tab->window, body_cols);
1319 	redraw_tab(tab);
1320 }
1321 
1322 static int
1323 wrap_page(struct window *window, int width)
1324 {
1325 	struct line		*l;
1326 	const struct line	*orig;
1327 	struct vline		*vl;
1328 	const char		*prfx;
1329 
1330 	orig = window->current_line == NULL
1331 		? NULL
1332 		: window->current_line->parent;
1333 	window->current_line = NULL;
1334 
1335 	window->curs_y = 0;
1336 	window->line_off = 0;
1337 
1338 	empty_vlist(window);
1339 
1340 	TAILQ_FOREACH(l, &window->page.head, lines) {
1341 		prfx = line_prefixes[l->type].prfx1;
1342 		switch (l->type) {
1343 		case LINE_TEXT:
1344 		case LINE_LINK:
1345 		case LINE_TITLE_1:
1346 		case LINE_TITLE_2:
1347 		case LINE_TITLE_3:
1348 		case LINE_ITEM:
1349 		case LINE_QUOTE:
1350 		case LINE_PRE_START:
1351 		case LINE_PRE_END:
1352 			wrap_text(window, prfx, l, width);
1353 			break;
1354 		case LINE_PRE_CONTENT:
1355                         hardwrap_text(window, l, width);
1356 			break;
1357 		}
1358 
1359 		if (orig == l && window->current_line == NULL) {
1360 			window->line_off = window->line_max-1;
1361 			window->current_line = TAILQ_LAST(&window->head, vhead);
1362 
1363 			while (1) {
1364 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1365 				if (vl == NULL || vl->parent != orig)
1366 					break;
1367 				window->current_line = vl;
1368 				window->line_off--;
1369 			}
1370 		}
1371 	}
1372 
1373         if (window->current_line == NULL)
1374 		window->current_line = TAILQ_FIRST(&window->head);
1375 
1376 	return 1;
1377 }
1378 
1379 static void
1380 print_vline(WINDOW *window, struct vline *vl)
1381 {
1382 	const char *text = vl->line;
1383 	const char *prfx;
1384 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1385 	int text_face = line_faces[vl->parent->type].text_prop;
1386 
1387 	if (!vl->flags)
1388 		prfx = line_prefixes[vl->parent->type].prfx1;
1389 	else
1390 		prfx = line_prefixes[vl->parent->type].prfx2;
1391 
1392 	if (text == NULL)
1393 		text = "";
1394 
1395 	wattron(window, prefix_face);
1396 	wprintw(window, "%s", prfx);
1397 	wattroff(window, prefix_face);
1398 
1399 	wattron(window, text_face);
1400 	wprintw(window, "%s", text);
1401 	wattroff(window, text_face);
1402 }
1403 
1404 static void
1405 redraw_tabline(void)
1406 {
1407 	struct tab	*tab;
1408 	size_t		 toskip, ots, tabwidth, space, x;
1409 	int		 current, y, truncated;
1410 	const char	*title;
1411 	char		 buf[25];
1412 
1413 	tabwidth = sizeof(buf)+1;
1414 	space = COLS-2;
1415 
1416 	toskip = 0;
1417 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1418 		toskip++;
1419 		if (tab->flags & TAB_CURRENT)
1420 			break;
1421 	}
1422 
1423 	if (toskip * tabwidth < space)
1424 		toskip = 0;
1425 	else {
1426 		ots = toskip;
1427 		toskip--;
1428                 while (toskip != 0 &&
1429 		    (ots - toskip+1) * tabwidth < space)
1430 			toskip--;
1431 	}
1432 
1433 	werase(tabline);
1434 	wattron(tabline, tab_face.background);
1435 	wprintw(tabline, toskip == 0 ? " " : "<");
1436 	wattroff(tabline, tab_face.background);
1437 
1438 	truncated = 0;
1439 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1440 		if (truncated)
1441 			break;
1442 		if (toskip != 0) {
1443 			toskip--;
1444 			continue;
1445 		}
1446 
1447 		getyx(tabline, y, x);
1448 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1449 			truncated = 1;
1450 
1451 		current = tab->flags & TAB_CURRENT;
1452 
1453 		if (*(title = tab->window.page.title) == '\0')
1454 			title = tab->hist_cur->h;
1455 
1456 		if (tab->flags & TAB_URGENT)
1457 			strlcpy(buf, "!", sizeof(buf));
1458 		else
1459 			strlcpy(buf, " ", sizeof(buf));
1460 
1461                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1462 			/* truncation happens */
1463 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1464 		} else {
1465 			/* pad with spaces */
1466 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1467 				/* nop */ ;
1468 		}
1469 
1470 		if (current)
1471 			wattron(tabline, tab_face.current_tab);
1472 		else
1473 			wattron(tabline, tab_face.tab);
1474 
1475 		wprintw(tabline, "%s", buf);
1476 		if (TAILQ_NEXT(tab, tabs) != NULL)
1477 			wprintw(tabline, " ");
1478 
1479 		if (current)
1480 			wattroff(tabline, tab_face.current_tab);
1481 		else
1482 			wattroff(tabline, tab_face.tab);
1483 	}
1484 
1485 	wattron(tabline, tab_face.background);
1486 	for (; x < (size_t)COLS; ++x)
1487 		waddch(tabline, ' ');
1488 	if (truncated)
1489 		mvwprintw(tabline, 0, COLS-1, ">");
1490 }
1491 
1492 static void
1493 redraw_window(WINDOW *win, int height, struct window *window)
1494 {
1495 	struct vline	*vl;
1496 	int		 l;
1497 
1498 	werase(win);
1499 
1500 	window->line_off = MIN(window->line_max-1, window->line_off);
1501 	if (TAILQ_EMPTY(&window->head))
1502 		return;
1503 
1504 	l = 0;
1505 	vl = nth_line(window, window->line_off);
1506 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1507 		wmove(win, l, 0);
1508 		print_vline(win, vl);
1509 		l++;
1510 		if (l == height)
1511 			break;
1512 	}
1513 
1514 	wmove(win, window->curs_y, window->curs_x);
1515 }
1516 
1517 static void
1518 redraw_help(void)
1519 {
1520 	redraw_window(help, help_lines, &helpwin);
1521 }
1522 
1523 static void
1524 redraw_body(struct tab *tab)
1525 {
1526 	redraw_window(body, body_lines, &tab->window);
1527 }
1528 
1529 static inline char
1530 trust_status_char(enum trust_state ts)
1531 {
1532 	switch (ts) {
1533 	case TS_UNKNOWN:	return 'u';
1534 	case TS_UNTRUSTED:	return '!';
1535 	case TS_TRUSTED:	return 'v';
1536 	case TS_VERIFIED:	return 'V';
1537 	}
1538 }
1539 
1540 static void
1541 redraw_modeline(struct tab *tab)
1542 {
1543 	double		 pct;
1544 	int		 x, y, max_x, max_y;
1545 	const char	*mode = tab->window.page.name;
1546 	const char	*spin = "-\\|/";
1547 
1548 	werase(modeline);
1549 	wattron(modeline, A_REVERSE);
1550 	wmove(modeline, 0, 0);
1551 
1552 	wprintw(modeline, "-%c%c %s ",
1553 	    spin[tab->loading_anim_step],
1554 	    trust_status_char(tab->trust),
1555 	    mode == NULL ? "(none)" : mode);
1556 
1557 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1558 
1559 	if (tab->window.line_max <= (size_t)body_lines)
1560                 wprintw(modeline, "All ");
1561 	else if (tab->window.line_off == 0)
1562                 wprintw(modeline, "Top ");
1563 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1564 		wprintw(modeline, "Bottom ");
1565 	else
1566 		wprintw(modeline, "%.0f%% ", pct);
1567 
1568 	wprintw(modeline, "%d/%d %s ",
1569 	    tab->window.line_off + tab->window.curs_y,
1570 	    tab->window.line_max,
1571 	    tab->hist_cur->h);
1572 
1573 	getyx(modeline, y, x);
1574 	getmaxyx(modeline, max_y, max_x);
1575 
1576 	(void)y;
1577 	(void)max_y;
1578 
1579 	for (; x < max_x; ++x)
1580 		waddstr(modeline, "-");
1581 }
1582 
1583 static void
1584 redraw_minibuffer(void)
1585 {
1586 	struct tab *tab;
1587 	size_t off_y, off_x = 0;
1588 	char *start, *c;
1589 
1590 	werase(minibuf);
1591 
1592 	if (in_minibuffer) {
1593 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1594 		if (ministate.hist_cur != NULL)
1595 			wprintw(minibuf, "(%zu/%zu) ",
1596 			    ministate.hist_off + 1,
1597 			    ministate.history->len);
1598 
1599 		getyx(minibuf, off_y, off_x);
1600 
1601 		start = ministate.hist_cur != NULL
1602 			? ministate.hist_cur->h
1603 			: ministate.buf;
1604 		c = utf8_nth(ministate.window.current_line->line,
1605 		    ministate.window.cpoff);
1606 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1607 			start = utf8_next_cp(start);
1608 		}
1609 
1610 		waddstr(minibuf, start);
1611 	}
1612 
1613 	if (ministate.curmesg != NULL)
1614                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1615 		    ministate.curmesg);
1616 
1617 	if (!in_minibuffer && ministate.curmesg == NULL)
1618 		waddstr(minibuf, keybuf);
1619 
1620 	/* If nothing else, show the URL at point */
1621 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1622 		tab = current_tab();
1623 		if (tab->window.current_line != NULL &&
1624 		    tab->window.current_line->parent->type == LINE_LINK)
1625 			waddstr(minibuf, tab->window.current_line->parent->alt);
1626 	}
1627 
1628 	if (in_minibuffer)
1629 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1630 }
1631 
1632 static void
1633 redraw_tab(struct tab *tab)
1634 {
1635 	if (side_window) {
1636 		redraw_help();
1637 		wnoutrefresh(help);
1638 	}
1639 
1640 	redraw_tabline();
1641 	redraw_body(tab);
1642 	redraw_modeline(tab);
1643 	redraw_minibuffer();
1644 
1645 	wnoutrefresh(tabline);
1646 	wnoutrefresh(modeline);
1647 
1648 	if (in_minibuffer) {
1649 		wnoutrefresh(body);
1650 		wnoutrefresh(minibuf);
1651 	} else {
1652 		wnoutrefresh(minibuf);
1653 		wnoutrefresh(body);
1654 	}
1655 
1656 	doupdate();
1657 }
1658 
1659 static void
1660 emit_help_item(char *prfx, void *fn)
1661 {
1662 	struct line	*l;
1663 	struct cmds	*cmd;
1664 
1665 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1666 		if (fn == cmd->fn)
1667 			break;
1668 	}
1669 	assert(cmd != NULL);
1670 
1671 	if ((l = calloc(1, sizeof(*l))) == NULL)
1672 		abort();
1673 
1674 	l->type = LINE_TEXT;
1675 	l->alt = NULL;
1676 
1677 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1678 
1679 	if (TAILQ_EMPTY(&helpwin.page.head))
1680 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1681 	else
1682 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1683 }
1684 
1685 static void
1686 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1687 {
1688 	struct keymap	*k;
1689 	char		 p[32];
1690 	const char	*kn;
1691 
1692 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1693 		strlcpy(p, prfx, sizeof(p));
1694 		if (*p != '\0')
1695 			strlcat(p, " ", sizeof(p));
1696 		if (k->meta)
1697 			strlcat(p, "M-", sizeof(p));
1698 		if ((kn = unkbd(k->key)) != NULL)
1699 			strlcat(p, kn, sizeof(p));
1700 		else
1701 			strlcat(p, keyname(k->key), sizeof(p));
1702 
1703 		if (k->fn == NULL)
1704 			rec_compute_help(&k->map, p, sizeof(p));
1705 		else
1706 			emit_help_item(p, k->fn);
1707 	}
1708 }
1709 
1710 static void
1711 recompute_help(void)
1712 {
1713 	char	p[32] = { 0 };
1714 
1715 	empty_vlist(&helpwin);
1716 	empty_linelist(&helpwin);
1717 	rec_compute_help(current_map, p, sizeof(p));
1718 	wrap_page(&helpwin, help_cols);
1719 }
1720 
1721 static void
1722 vmessage(const char *fmt, va_list ap)
1723 {
1724 	if (evtimer_pending(&clminibufev, NULL))
1725 		evtimer_del(&clminibufev);
1726 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1727 	evtimer_add(&clminibufev, &clminibufev_timer);
1728 
1729 	free(ministate.curmesg);
1730 
1731 	/* TODO: what to do if the allocation fails here? */
1732 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1733 		ministate.curmesg = NULL;
1734 
1735 	redraw_minibuffer();
1736 	if (in_minibuffer) {
1737 		wrefresh(body);
1738 		wrefresh(minibuf);
1739 	} else {
1740 		wrefresh(minibuf);
1741 		wrefresh(body);
1742 	}
1743 }
1744 
1745 static void
1746 message(const char *fmt, ...)
1747 {
1748 	va_list ap;
1749 
1750 	va_start(ap, fmt);
1751 	vmessage(fmt, ap);
1752 	va_end(ap);
1753 }
1754 
1755 static void
1756 start_loading_anim(struct tab *tab)
1757 {
1758 	if (tab->loading_anim)
1759 		return;
1760 	tab->loading_anim = 1;
1761 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1762 	evtimer_add(&tab->loadingev, &loadingev_timer);
1763 }
1764 
1765 static void
1766 update_loading_anim(int fd, short ev, void *d)
1767 {
1768 	struct tab	*tab = d;
1769 
1770 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1771 
1772 	if (tab->flags & TAB_CURRENT) {
1773 		redraw_modeline(tab);
1774 		wrefresh(modeline);
1775 		wrefresh(body);
1776 		if (in_minibuffer)
1777 			wrefresh(minibuf);
1778 	}
1779 
1780 	evtimer_add(&tab->loadingev, &loadingev_timer);
1781 }
1782 
1783 static void
1784 stop_loading_anim(struct tab *tab)
1785 {
1786 	if (!tab->loading_anim)
1787 		return;
1788 	evtimer_del(&tab->loadingev);
1789 	tab->loading_anim = 0;
1790 	tab->loading_anim_step = 0;
1791 
1792 	if (!(tab->flags & TAB_CURRENT))
1793 		return;
1794 
1795 	redraw_modeline(tab);
1796 
1797 	wrefresh(modeline);
1798 	wrefresh(body);
1799 	if (in_minibuffer)
1800 		wrefresh(minibuf);
1801 }
1802 
1803 static void
1804 load_url_in_tab(struct tab *tab, const char *url)
1805 {
1806 	message("Loading %s...", url);
1807 	start_loading_anim(tab);
1808 	load_url(tab, url);
1809 
1810 	tab->window.curs_x = 0;
1811 	tab->window.curs_y = 0;
1812 	redraw_tab(tab);
1813 }
1814 
1815 static void
1816 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1817     void (*abortfn)(void), struct histhead *hist)
1818 {
1819 	in_minibuffer = 1;
1820 	base_map = &minibuffer_map;
1821 	current_map = &minibuffer_map;
1822 
1823 	base_map->unhandled_input = self_insert_fn;
1824 
1825 	ministate.donefn = donefn;
1826 	ministate.abortfn = abortfn;
1827 	memset(ministate.buf, 0, sizeof(ministate.buf));
1828 	ministate.window.current_line = &ministate.vline;
1829 	ministate.window.current_line->line = ministate.buf;
1830 	ministate.window.cpoff = 0;
1831 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1832 
1833 	ministate.history = hist;
1834 	ministate.hist_cur = NULL;
1835 	ministate.hist_off = 0;
1836 }
1837 
1838 static void
1839 exit_minibuffer(void)
1840 {
1841 	werase(minibuf);
1842 
1843 	in_minibuffer = 0;
1844 	base_map = &global_map;
1845 	current_map = &global_map;
1846 }
1847 
1848 static void
1849 switch_to_tab(struct tab *tab)
1850 {
1851 	struct tab	*t;
1852 
1853 	TAILQ_FOREACH(t, &tabshead, tabs) {
1854 		t->flags &= ~TAB_CURRENT;
1855 	}
1856 
1857 	tab->flags |= TAB_CURRENT;
1858 }
1859 
1860 unsigned int
1861 tab_new_id(void)
1862 {
1863 	return tab_counter++;
1864 }
1865 
1866 static struct tab *
1867 new_tab(const char *url)
1868 {
1869 	struct tab	*tab;
1870 
1871 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1872 		event_loopbreak();
1873 		return NULL;
1874 	}
1875 
1876 	TAILQ_INIT(&tab->hist.head);
1877 
1878 	TAILQ_INIT(&tab->window.head);
1879 
1880 	tab->id = tab_new_id();
1881 	switch_to_tab(tab);
1882 
1883 	if (TAILQ_EMPTY(&tabshead))
1884 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1885 	else
1886 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1887 
1888 	load_url_in_tab(tab, url);
1889 	return tab;
1890 }
1891 
1892 static void
1893 session_new_tab_cb(const char *url)
1894 {
1895 	new_tab(url);
1896 }
1897 
1898 static void
1899 usage(void)
1900 {
1901 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1902 }
1903 
1904 int
1905 ui_init(int argc, char * const *argv)
1906 {
1907 	const char *url = NEW_TAB_URL;
1908 	int ch;
1909 
1910 	while ((ch = getopt(argc, argv, "")) != -1) {
1911 		switch (ch) {
1912 		default:
1913 			usage();
1914 			return 0;
1915 		}
1916 	}
1917 	argc -= optind;
1918 	argv += optind;
1919 
1920 	if (argc != 0)
1921 		url = argv[0];
1922 
1923 	setlocale(LC_ALL, "");
1924 
1925 	TAILQ_INIT(&global_map.m);
1926 	global_map.unhandled_input = global_key_unbound;
1927 
1928 	TAILQ_INIT(&minibuffer_map.m);
1929 
1930 	TAILQ_INIT(&eecmd_history.head);
1931 	TAILQ_INIT(&ir_history.head);
1932 	TAILQ_INIT(&lu_history.head);
1933 
1934 	ministate.line.type = LINE_TEXT;
1935 	ministate.vline.parent = &ministate.line;
1936 	ministate.window.current_line = &ministate.vline;
1937 
1938 	/* initialize help window */
1939 	TAILQ_INIT(&helpwin.head);
1940 
1941 	base_map = &global_map;
1942 	current_map = &global_map;
1943 	load_default_keys();
1944 
1945 	initscr();
1946 	raw();
1947 	noecho();
1948 
1949 	nonl();
1950 	intrflush(stdscr, FALSE);
1951 
1952 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1953 		return 0;
1954 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1955 		return 0;
1956 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1957 		return 0;
1958 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1959 		return 0;
1960 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1961 		return 0;
1962 
1963 	body_lines = LINES-3;
1964 	body_cols = COLS;
1965 
1966 	keypad(body, TRUE);
1967 	scrollok(body, TRUE);
1968 
1969 	/* non-blocking input */
1970 	wtimeout(body, 0);
1971 
1972 	mvwprintw(body, 0, 0, "");
1973 
1974 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1975 	event_add(&stdioev, NULL);
1976 
1977 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1978 	signal_add(&winchev, NULL);
1979 
1980 	load_last_session(session_new_tab_cb);
1981 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
1982 		new_tab(url);
1983 
1984 	return 1;
1985 }
1986 
1987 void
1988 ui_on_tab_loaded(struct tab *tab)
1989 {
1990 	stop_loading_anim(tab);
1991 	message("Loaded %s", tab->hist_cur->h);
1992 
1993 	redraw_tabline();
1994 	wrefresh(tabline);
1995 	if (in_minibuffer)
1996 		wrefresh(minibuf);
1997 	else
1998 		wrefresh(body);
1999 }
2000 
2001 void
2002 ui_on_tab_refresh(struct tab *tab)
2003 {
2004 	wrap_page(&tab->window, body_cols);
2005 	if (tab->flags & TAB_CURRENT) {
2006 		restore_cursor(&tab->window);
2007 		redraw_tab(tab);
2008 	} else
2009 		tab->flags |= TAB_URGENT;
2010 }
2011 
2012 void
2013 ui_require_input(struct tab *tab, int hide)
2014 {
2015 	/* TODO: hard-switching to another tab is ugly */
2016 	switch_to_tab(tab);
2017 
2018 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2019 	    &ir_history);
2020 	strlcpy(ministate.prompt, "Input required: ",
2021 	    sizeof(ministate.prompt));
2022 	redraw_tab(tab);
2023 }
2024 
2025 void
2026 ui_yornp(const char *prompt, void (*fn)(int, unsigned int),
2027     unsigned int data)
2028 {
2029 	size_t len;
2030 
2031 	if (in_minibuffer) {
2032 		fn(0, data);
2033 		return;
2034 	}
2035 
2036 	yornp_cb = fn;
2037 	yornp_data = data;
2038 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2039 	    yornp_abort, NULL);
2040 
2041 	len = sizeof(ministate.prompt);
2042 	strlcpy(ministate.prompt, prompt, len);
2043 	strlcat(ministate.prompt, " (y or n) ", len);
2044 	redraw_tab(current_tab());
2045 }
2046 
2047 void
2048 ui_notify(const char *fmt, ...)
2049 {
2050 	va_list ap;
2051 
2052 	va_start(ap, fmt);
2053 	vmessage(fmt, ap);
2054 	va_end(ap);
2055 }
2056 
2057 void
2058 ui_end(void)
2059 {
2060 	endwin();
2061 }