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  *
27  * This means that on every resize we have to clear our list of lines
28  * and re-render everything.  A clever approach would be to do this
29  * ``on-demand'', but it's still missing.
30  *
31  */
32 
33 #include "telescope.h"
34 
35 #include <assert.h>
36 #include <curses.h>
37 #include <event.h>
38 #include <limits.h>
39 #include <locale.h>
40 #include <signal.h>
41 #include <stdarg.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 
46 static struct event	stdioev, winchev;
47 
48 static void		 load_default_keys(void);
49 
50 static void		 global_key_unbound(void);
51 static void		 minibuffer_hist_save_entry(void);
52 static void		 minibuffer_self_insert(void);
53 static void		 yornp_self_insert(void);
54 static void		 yornp_abort(void);
55 static void		 read_self_insert(void);
56 static void		 read_abort(void);
57 static void		 read_select(void);
58 
59 static struct vline	*nth_line(struct buffer*, size_t);
60 static struct buffer	*current_buffer(void);
61 static int		 readkey(void);
62 static void		 dispatch_stdio(int, short, void*);
63 static void		 handle_clear_minibuf(int, short, void*);
64 static void		 handle_resize(int, short, void*);
65 static void		 handle_resize_nodelay(int, short, void*);
66 static int		 wrap_page(struct buffer*, int);
67 static void		 print_vline(int, int, WINDOW*, struct vline*);
68 static void		 redraw_tabline(void);
69 static void		 redraw_window(WINDOW*, int, int, struct buffer*);
70 static void		 redraw_help(void);
71 static void		 redraw_body(struct tab*);
72 static void		 redraw_modeline(struct tab*);
73 static void		 redraw_minibuffer(void);
74 static void		 redraw_tab(struct tab*);
75 static void		 emit_help_item(char*, void*);
76 static void		 rec_compute_help(struct kmap*, char*, size_t);
77 static void		 recompute_help(void);
78 static void		 update_loading_anim(int, short, void*);
79 static void		 stop_loading_anim(struct tab*);
80 static void		 session_new_tab_cb(const char*);
81 static void		 usage(void);
82 
83 static int		 x_offset;
84 
85 struct thiskey thiskey;
86 
87 static struct event	resizeev;
88 static struct timeval	resize_timer = { 0, 250000 };
89 
90 static WINDOW	*tabline, *body, *modeline, *minibuf;
91 
92 int			 body_lines, body_cols;
93 
94 static WINDOW		*help;
95 static struct buffer	 helpwin;
96 static int		 help_lines, help_cols;
97 
98 static int		 side_window;
99 
100 static struct event	clminibufev;
101 static struct timeval	clminibufev_timer = { 5, 0 };
102 static struct timeval	loadingev_timer = { 0, 250000 };
103 
104 static uint32_t		 tab_counter;
105 
106 static char	keybuf[64];
107 
108 static void (*yornp_cb)(int, unsigned int);
109 static unsigned int yornp_data;
110 
111 static void (*read_cb)(const char*, unsigned int);
112 static unsigned int read_data;
113 
114 struct kmap global_map,
115 	minibuffer_map,
116 	*current_map,
117 	*base_map;
118 
119 struct histhead eecmd_history,
120 	ir_history,
121 	lu_history,
122 	read_history;
123 
124 int in_minibuffer;
125 
126 struct ministate ministate;
127 
128 static inline void
129 update_x_offset(void)
130 {
131 	if (olivetti_mode && fill_column < body_cols)
132 		x_offset = (body_cols - fill_column)/2;
133 	else
134 		x_offset = 0;
135 }
136 
137 static inline void
138 global_set_key(const char *key, void (*fn)(struct buffer*))
139 {
140 	if (!kmap_define_key(&global_map, key, fn))
141 		_exit(1);
142 }
143 
144 static inline void
145 minibuffer_set_key(const char *key, void (*fn)(struct buffer*))
146 {
147 	if (!kmap_define_key(&minibuffer_map, key, fn))
148 		_exit(1);
149 }
150 
151 static void
152 load_default_keys(void)
153 {
154 	/* === global map === */
155 
156 	/* emacs */
157 	global_set_key("C-p",		cmd_previous_line);
158 	global_set_key("C-n",		cmd_next_line);
159 	global_set_key("C-f",		cmd_forward_char);
160 	global_set_key("C-b",		cmd_backward_char);
161 	global_set_key("M-{",		cmd_backward_paragraph);
162 	global_set_key("M-}",		cmd_forward_paragraph);
163 	global_set_key("C-a",		cmd_move_beginning_of_line);
164 	global_set_key("C-e",		cmd_move_end_of_line);
165 
166 	global_set_key("M-v",		cmd_scroll_up);
167 	global_set_key("C-v",		cmd_scroll_down);
168 	global_set_key("M-space",	cmd_scroll_up);
169 	global_set_key("space",		cmd_scroll_down);
170 
171 	global_set_key("M-<",		cmd_beginning_of_buffer);
172 	global_set_key("M->",		cmd_end_of_buffer);
173 
174 	global_set_key("C-x C-c",	cmd_kill_telescope);
175 
176 	global_set_key("C-g",		cmd_clear_minibuf);
177 
178 	global_set_key("M-x",		cmd_execute_extended_command);
179 
180 	global_set_key("C-c {",		cmd_dec_fill_column);
181 	global_set_key("C-c }",		cmd_inc_fill_column);
182 
183 	global_set_key("C-c p",		cmd_previous_heading);
184 	global_set_key("C-c n",		cmd_next_heading);
185 
186 	global_set_key(">",		cmd_load_url);
187 	global_set_key("C-x C-f",	cmd_load_url);
188 	global_set_key("C-x M-f",	cmd_load_current_url);
189 
190 	global_set_key("C-x t 0",	cmd_tab_close);
191 	global_set_key("C-x t 1",	cmd_tab_close_other);
192 	global_set_key("C-x t 2",	cmd_tab_new);
193 	global_set_key("C-x t o",	cmd_tab_next);
194 	global_set_key("C-x t O",	cmd_tab_previous);
195 	global_set_key("C-x t m",	cmd_tab_move);
196 	global_set_key("C-x t M",	cmd_tab_move_to);
197 
198 	global_set_key("C-M-b",		cmd_previous_page);
199 	global_set_key("C-M-f",		cmd_next_page);
200 
201 	global_set_key("<f7> a",	cmd_bookmark_page);
202 	global_set_key("<f7> <f7>",	cmd_list_bookmarks);
203 
204 	/* vi/vi-like */
205 	global_set_key("k",		cmd_previous_line);
206 	global_set_key("j",		cmd_next_line);
207 	global_set_key("l",		cmd_forward_char);
208 	global_set_key("h",		cmd_backward_char);
209 	global_set_key("{",		cmd_backward_paragraph);
210 	global_set_key("}",		cmd_forward_paragraph);
211 	global_set_key("^",		cmd_move_beginning_of_line);
212 	global_set_key("$",		cmd_move_end_of_line);
213 
214 	global_set_key("K",		cmd_scroll_line_up);
215 	global_set_key("J",		cmd_scroll_line_down);
216 
217 	global_set_key("g g",		cmd_beginning_of_buffer);
218 	global_set_key("G",		cmd_end_of_buffer);
219 
220 	global_set_key("g D",		cmd_tab_close);
221 	global_set_key("g N",		cmd_tab_new);
222 	global_set_key("g t",		cmd_tab_next);
223 	global_set_key("g T",		cmd_tab_previous);
224 	global_set_key("g M-t",		cmd_tab_move);
225 	global_set_key("g M-T",		cmd_tab_move_to);
226 
227 	global_set_key("H",		cmd_previous_page);
228 	global_set_key("L",		cmd_next_page);
229 
230 	/* tmp */
231 	global_set_key("q",		cmd_kill_telescope);
232 
233 	global_set_key("esc",		cmd_clear_minibuf);
234 
235 	global_set_key(":",		cmd_execute_extended_command);
236 
237 	/* cua */
238 	global_set_key("<up>",		cmd_previous_line);
239 	global_set_key("<down>",	cmd_next_line);
240 	global_set_key("<right>",	cmd_forward_char);
241 	global_set_key("<left>",	cmd_backward_char);
242 	global_set_key("<prior>",	cmd_scroll_up);
243 	global_set_key("<next>",	cmd_scroll_down);
244 
245 	global_set_key("M-<left>",	cmd_previous_page);
246 	global_set_key("M-<right>",	cmd_next_page);
247 
248 	/* "ncurses standard" */
249 	global_set_key("C-l",		cmd_redraw);
250 
251 	/* global */
252 	global_set_key("<f1>",		cmd_toggle_help);
253 	global_set_key("C-m",		cmd_push_button);
254 	global_set_key("M-enter",	cmd_push_button_new_tab);
255 	global_set_key("M-tab",		cmd_previous_button);
256 	global_set_key("backtab",	cmd_previous_button);
257 	global_set_key("tab",		cmd_next_button);
258 
259 	/* === minibuffer map === */
260 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
261 	minibuffer_set_key("C-g",		cmd_mini_abort);
262 	minibuffer_set_key("esc",		cmd_mini_abort);
263 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
264 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
265 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
266 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
267 
268 	minibuffer_set_key("C-b",		cmd_backward_char);
269 	minibuffer_set_key("C-f",		cmd_forward_char);
270 	minibuffer_set_key("<left>",		cmd_backward_char);
271 	minibuffer_set_key("<right>",		cmd_forward_char);
272 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
273 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
274 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
275 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
276 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
277 
278 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
279 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
280 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
281 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
282 }
283 
284 void
285 save_excursion(struct excursion *place, struct buffer *buffer)
286 {
287 	place->curs_x = buffer->curs_x;
288 	place->curs_y = buffer->curs_y;
289 	place->line_off = buffer->line_off;
290 	place->current_line = buffer->current_line;
291 	place->cpoff = buffer->cpoff;
292 }
293 
294 void
295 restore_excursion(struct excursion *place, struct buffer *buffer)
296 {
297 	buffer->curs_x = place->curs_x;
298 	buffer->curs_y = place->curs_y;
299 	buffer->line_off = place->line_off;
300 	buffer->current_line = place->current_line;
301 	buffer->cpoff = place->cpoff;
302 }
303 
304 void
305 restore_cursor(struct buffer *buffer)
306 {
307 	struct vline	*vl;
308 	const char	*prfx;
309 
310 	vl = buffer->current_line;
311 	if (vl == NULL || vl->line == NULL)
312 		buffer->curs_x = buffer->cpoff = 0;
313 	else
314 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
315 
316 	buffer->curs_x += x_offset;
317 
318 	if (vl != NULL) {
319 		prfx = line_prefixes[vl->parent->type].prfx1;
320 		buffer->curs_x += utf8_swidth(prfx);
321 	}
322 }
323 
324 static void
325 global_key_unbound(void)
326 {
327 	message("%s is undefined", keybuf);
328 }
329 
330 static void
331 minibuffer_hist_save_entry(void)
332 {
333 	struct hist	*hist;
334 
335 	if (ministate.history == NULL)
336 		return;
337 
338 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
339 		abort();
340 
341 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
342 
343 	if (TAILQ_EMPTY(&ministate.history->head))
344 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
345 	else
346 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
347 	ministate.history->len++;
348 }
349 
350 /*
351  * taint the minibuffer cache: if we're currently showing a history
352  * element, copy that to the current buf and reset the "history
353  * navigation" thing.
354  */
355 void
356 minibuffer_taint_hist(void)
357 {
358 	if (ministate.hist_cur == NULL)
359 		return;
360 
361 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
362 	ministate.hist_cur = NULL;
363 }
364 
365 static void
366 minibuffer_self_insert(void)
367 {
368 	char	*c, tmp[5] = {0};
369 	size_t	len;
370 
371 	minibuffer_taint_hist();
372 
373 	if (thiskey.cp == 0)
374 		return;
375 
376 	len = utf8_encode(thiskey.cp, tmp);
377 	c = utf8_nth(ministate.buffer.current_line->line, ministate.buffer.cpoff);
378 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
379 		return;
380 
381 	memmove(c + len, c, strlen(c)+1);
382 	memcpy(c, tmp, len);
383 	ministate.buffer.cpoff++;
384 }
385 
386 void
387 eecmd_self_insert(void)
388 {
389 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
390 	    !unicode_isgraph(thiskey.cp)) {
391 		global_key_unbound();
392 		return;
393 	}
394 
395 	minibuffer_self_insert();
396 }
397 
398 void
399 eecmd_select(void)
400 {
401 	struct cmd *cmd;
402 
403 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
404 		if (!strcmp(cmd->cmd, ministate.buf)) {
405 			exit_minibuffer();
406 			minibuffer_hist_save_entry();
407 			cmd->fn(current_buffer());
408 			return;
409 		}
410 	}
411 
412 	message("No match");
413 }
414 
415 void
416 ir_self_insert(void)
417 {
418 	minibuffer_self_insert();
419 }
420 
421 void
422 ir_select(void)
423 {
424 	char		 buf[1025] = {0};
425 	struct phos_uri	 uri;
426 	struct tab	*tab;
427 
428 	tab = current_tab();
429 
430 	exit_minibuffer();
431 	minibuffer_hist_save_entry();
432 
433 	/* a bit ugly but... */
434 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
435 	phos_uri_set_query(&uri, ministate.buf);
436 	phos_serialize_uri(&uri, buf, sizeof(buf));
437 	load_url_in_tab(tab, buf);
438 }
439 
440 void
441 lu_self_insert(void)
442 {
443 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
444 	    !unicode_isgraph(thiskey.key)) {
445 		global_key_unbound();
446 		return;
447 	}
448 
449 	minibuffer_self_insert();
450 }
451 
452 void
453 lu_select(void)
454 {
455 	exit_minibuffer();
456 	minibuffer_hist_save_entry();
457 	load_url_in_tab(current_tab(), ministate.buf);
458 }
459 
460 void
461 bp_select(void)
462 {
463 	exit_minibuffer();
464 	if (*ministate.buf != '\0')
465 		add_to_bookmarks(ministate.buf);
466 	else
467 		message("Abort.");
468 }
469 
470 static void
471 yornp_self_insert(void)
472 {
473 	if (thiskey.key != 'y' && thiskey.key != 'n') {
474 		message("Please answer y or n");
475 		return;
476 	}
477 
478 	exit_minibuffer();
479 	yornp_cb(thiskey.key == 'y', yornp_data);
480 }
481 
482 static void
483 yornp_abort(void)
484 {
485 	exit_minibuffer();
486 	yornp_cb(0, yornp_data);
487 }
488 
489 static void
490 read_self_insert(void)
491 {
492 	if (thiskey.meta || !unicode_isgraph(thiskey.cp)) {
493 		global_key_unbound();
494 		return;
495 	}
496 
497 	minibuffer_self_insert();
498 }
499 
500 static void
501 read_abort(void)
502 {
503 	exit_minibuffer();
504 	read_cb(NULL, read_data);
505 }
506 
507 static void
508 read_select(void)
509 {
510         exit_minibuffer();
511 	minibuffer_hist_save_entry();
512 	read_cb(ministate.buf, read_data);
513 }
514 
515 static struct vline *
516 nth_line(struct buffer *buffer, size_t n)
517 {
518 	struct vline	*vl;
519 	size_t		 i;
520 
521 	i = 0;
522 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
523 		if (i == n)
524 			return vl;
525 		i++;
526 	}
527 
528 	/* unreachable */
529 	abort();
530 }
531 
532 struct tab *
533 current_tab(void)
534 {
535 	struct tab *t;
536 
537 	TAILQ_FOREACH(t, &tabshead, tabs) {
538 		if (t->flags & TAB_CURRENT)
539 			return t;
540 	}
541 
542 	/* unreachable */
543 	abort();
544 }
545 
546 struct buffer *
547 current_buffer(void)
548 {
549 	if (in_minibuffer)
550 		return &ministate.buffer;
551 	return &current_tab()->buffer;
552 }
553 
554 static int
555 readkey(void)
556 {
557 	uint32_t state = 0;
558 
559 	if ((thiskey.key = wgetch(body)) == ERR)
560 		return 0;
561 
562 	thiskey.meta = thiskey.key == 27;
563 	if (thiskey.meta) {
564 		thiskey.key = wgetch(body);
565 		if (thiskey.key == ERR || thiskey.key == 27) {
566 			thiskey.meta = 0;
567 			thiskey.key = 27;
568 		}
569 	}
570 
571 	thiskey.cp = 0;
572 	if ((unsigned int)thiskey.key < UINT8_MAX) {
573 		while (1) {
574 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
575 				break;
576 			if ((thiskey.key = wgetch(body)) == ERR) {
577 				message("Error decoding user input");
578 				return 0;
579 			}
580 		}
581 	}
582 
583 	return 1;
584 }
585 
586 static void
587 dispatch_stdio(int fd, short ev, void *d)
588 {
589 	struct keymap	*k;
590 	const char	*keyname;
591 	char		 tmp[5] = {0};
592 
593 	if (!readkey())
594 		return;
595 
596 	if (keybuf[0] != '\0')
597 		strlcat(keybuf, " ", sizeof(keybuf));
598 	if (thiskey.meta)
599 		strlcat(keybuf, "M-", sizeof(keybuf));
600 	if (thiskey.cp != 0) {
601 		utf8_encode(thiskey.cp, tmp);
602 		strlcat(keybuf, tmp, sizeof(keybuf));
603 	} else {
604 		if ((keyname = unkbd(thiskey.key)) != NULL)
605 			strlcat(keybuf, keyname, sizeof(keybuf));
606 		else {
607 			tmp[0] = thiskey.key;
608 			strlcat(keybuf, tmp, sizeof(keybuf));
609 		}
610 	}
611 
612 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
613 		if (k->meta == thiskey.meta &&
614 		    k->key == thiskey.key) {
615 			if (k->fn == NULL)
616 				current_map = &k->map;
617 			else {
618 				current_map = base_map;
619 				strlcpy(keybuf, "", sizeof(keybuf));
620 				k->fn(current_buffer());
621 			}
622 			goto done;
623 		}
624 	}
625 
626 	if (current_map->unhandled_input != NULL)
627 		current_map->unhandled_input();
628 	else
629 		global_key_unbound();
630 
631 	strlcpy(keybuf, "", sizeof(keybuf));
632 	current_map = base_map;
633 
634 done:
635 	if (side_window)
636 		recompute_help();
637 
638 	redraw_tab(current_tab());
639 }
640 
641 static void
642 handle_clear_minibuf(int fd, short ev, void *d)
643 {
644 	free(ministate.curmesg);
645 	ministate.curmesg = NULL;
646 
647 	redraw_minibuffer();
648 	if (in_minibuffer) {
649 		wrefresh(body);
650 		wrefresh(minibuf);
651 	} else {
652 		wrefresh(minibuf);
653 		wrefresh(body);
654 	}
655 }
656 
657 static void
658 handle_resize(int sig, short ev, void *d)
659 {
660 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
661 		event_del(&resizeev);
662 	}
663 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
664 	evtimer_add(&resizeev, &resize_timer);
665 }
666 
667 static void
668 handle_resize_nodelay(int s, short ev, void *d)
669 {
670 	struct tab	*tab;
671 
672 	endwin();
673 	refresh();
674 	clear();
675 
676 	/* move and resize the windows, in reverse order! */
677 
678 	mvwin(minibuf, LINES-1, 0);
679 	wresize(minibuf, 1, COLS);
680 
681 	mvwin(modeline, LINES-2, 0);
682 	wresize(modeline, 1, COLS);
683 
684 	body_lines = LINES-3;
685 	body_cols = COLS;
686 
687 	if (side_window) {
688 		help_cols = 0.3 * COLS;
689 		help_lines = LINES-3;
690 		mvwin(help, 1, 0);
691 		wresize(help, help_lines, help_cols);
692 
693 		wrap_page(&helpwin, help_cols);
694 
695 		body_cols = COLS - help_cols - 1;
696 		mvwin(body, 1, help_cols);
697 	} else
698 		mvwin(body, 1, 0);
699 
700 	update_x_offset();
701 	wresize(body, body_lines, body_cols);
702 
703 	wresize(tabline, 1, COLS);
704 
705 	tab = current_tab();
706 
707 	wrap_page(&tab->buffer, body_cols);
708 	redraw_tab(tab);
709 }
710 
711 static int
712 wrap_page(struct buffer *buffer, int width)
713 {
714 	struct line		*l;
715 	const struct line	*orig;
716 	struct vline		*vl;
717 	int			 pre_width;
718 	const char		*prfx;
719 
720 	orig = buffer->current_line == NULL
721 		? NULL
722 		: buffer->current_line->parent;
723 	buffer->current_line = NULL;
724 
725 	buffer->force_redraw = 1;
726 	buffer->curs_y = 0;
727 	buffer->line_off = 0;
728 
729 	empty_vlist(buffer);
730 
731 	TAILQ_FOREACH(l, &buffer->page.head, lines) {
732 		prfx = line_prefixes[l->type].prfx1;
733 		switch (l->type) {
734 		case LINE_TEXT:
735 		case LINE_LINK:
736 		case LINE_TITLE_1:
737 		case LINE_TITLE_2:
738 		case LINE_TITLE_3:
739 		case LINE_ITEM:
740 		case LINE_QUOTE:
741 		case LINE_PRE_START:
742 		case LINE_PRE_END:
743 			wrap_text(buffer, prfx, l, MIN(fill_column, width));
744 			break;
745 		case LINE_PRE_CONTENT:
746 			if (olivetti_mode)
747 				pre_width = MIN(fill_column, width);
748 			else
749 				pre_width = width;
750 			hardwrap_text(buffer, l, pre_width);
751 			break;
752 		}
753 
754 		if (orig == l && buffer->current_line == NULL) {
755 			buffer->line_off = buffer->line_max-1;
756 			buffer->current_line = TAILQ_LAST(&buffer->head, vhead);
757 
758 			while (1) {
759 				vl = TAILQ_PREV(buffer->current_line, vhead, vlines);
760 				if (vl == NULL || vl->parent != orig)
761 					break;
762 				buffer->current_line = vl;
763 				buffer->line_off--;
764 			}
765 		}
766 	}
767 
768         if (buffer->current_line == NULL)
769 		buffer->current_line = TAILQ_FIRST(&buffer->head);
770 
771 	return 1;
772 }
773 
774 static void
775 print_vline(int off, int width, WINDOW *window, struct vline *vl)
776 {
777 	const char *text;
778 	const char *prfx;
779 	struct line_face *f;
780 	int i, left, x, y;
781 
782 	f = &line_faces[vl->parent->type];
783 
784 	/* unused, set by getyx */
785 	(void)y;
786 
787 	if (!vl->flags)
788 		prfx = line_prefixes[vl->parent->type].prfx1;
789 	else
790 		prfx = line_prefixes[vl->parent->type].prfx2;
791 
792 	text = vl->line;
793 	if (text == NULL)
794 		text = "";
795 
796 	wattr_on(window, body_face.left, NULL);
797 	for (i = 0; i < off; i++)
798 		waddch(window, ' ');
799 	wattr_off(window, body_face.left, NULL);
800 
801 	wattr_on(window, f->prefix, NULL);
802 	wprintw(window, "%s", prfx);
803 	wattr_off(window, f->prefix, NULL);
804 
805 	wattr_on(window, f->text, NULL);
806 	wprintw(window, "%s", text);
807 	wattr_off(window, f->text, NULL);
808 
809 	getyx(window, y, x);
810 
811 	left = width - x;
812 
813 	wattr_on(window, f->trail, NULL);
814 	for (i = 0; i < left - off - 1; ++i)
815 		waddch(window, ' ');
816 	wattr_off(window, f->trail, NULL);
817 
818 	wattr_on(window, body_face.right, NULL);
819 	for (i = 0; i < off; i++)
820 		waddch(window, ' ');
821 	wattr_off(window, body_face.right, NULL);
822 
823 }
824 
825 static void
826 redraw_tabline(void)
827 {
828 	struct tab	*tab;
829 	size_t		 toskip, ots, tabwidth, space, x;
830 	int		 current, y, truncated;
831 	const char	*title;
832 	char		 buf[25];
833 
834 	x = 0;
835 
836 	/* unused, but setted by a getyx */
837 	(void)y;
838 
839 	tabwidth = sizeof(buf)+1;
840 	space = COLS-2;
841 
842 	toskip = 0;
843 	TAILQ_FOREACH(tab, &tabshead, tabs) {
844 		toskip++;
845 		if (tab->flags & TAB_CURRENT)
846 			break;
847 	}
848 
849 	if (toskip * tabwidth < space)
850 		toskip = 0;
851 	else {
852 		ots = toskip;
853 		toskip--;
854                 while (toskip != 0 &&
855 		    (ots - toskip+1) * tabwidth < space)
856 			toskip--;
857 	}
858 
859 	werase(tabline);
860 	wattr_on(tabline, tab_face.background, NULL);
861 	wprintw(tabline, toskip == 0 ? " " : "<");
862 	wattr_off(tabline, tab_face.background, NULL);
863 
864 	truncated = 0;
865 	TAILQ_FOREACH(tab, &tabshead, tabs) {
866 		if (truncated)
867 			break;
868 		if (toskip != 0) {
869 			toskip--;
870 			continue;
871 		}
872 
873 		getyx(tabline, y, x);
874 		if (x + sizeof(buf)+2 >= (size_t)COLS)
875 			truncated = 1;
876 
877 		current = tab->flags & TAB_CURRENT;
878 
879 		if (*(title = tab->buffer.page.title) == '\0')
880 			title = tab->hist_cur->h;
881 
882 		if (tab->flags & TAB_URGENT)
883 			strlcpy(buf, "!", sizeof(buf));
884 		else
885 			strlcpy(buf, " ", sizeof(buf));
886 
887                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
888 			/* truncation happens */
889 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
890 		} else {
891 			/* pad with spaces */
892 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
893 				/* nop */ ;
894 		}
895 
896 		if (current)
897 			wattr_on(tabline, tab_face.current, NULL);
898 		else
899 			wattr_on(tabline, tab_face.tab, NULL);
900 
901 		wprintw(tabline, "%s", buf);
902 		if (TAILQ_NEXT(tab, tabs) != NULL)
903 			wprintw(tabline, " ");
904 
905 		if (current)
906 			wattr_off(tabline, tab_face.current, NULL);
907 		else
908 			wattr_off(tabline, tab_face.tab, NULL);
909 	}
910 
911 	wattr_on(tabline, tab_face.background, NULL);
912 	for (; x < (size_t)COLS; ++x)
913 		waddch(tabline, ' ');
914 	if (truncated)
915 		mvwprintw(tabline, 0, COLS-1, ">");
916 	wattr_off(tabline, tab_face.background, NULL);
917 }
918 
919 static void
920 redraw_window(WINDOW *win, int height, int width, struct buffer *buffer)
921 {
922 	struct vline	*vl;
923 	int		 l;
924 
925 	/*
926 	 * Don't bother redraw the body if nothing changed.  Cursor
927 	 * movements count as "nothing changed" if it hasn't produced
928 	 * a scroll.  Ensure that wmove is called though!
929 	 */
930 	if (!buffer->force_redraw &&
931 	    buffer->last_line_off == buffer->line_off)
932 		goto end;
933 
934 	werase(win);
935 
936 	buffer->line_off = MIN(buffer->line_max-1, buffer->line_off);
937 	buffer->force_redraw = 0;
938 	buffer->last_line_off = buffer->line_off;
939 
940 	if (TAILQ_EMPTY(&buffer->head))
941 		goto end;
942 
943 	l = 0;
944 	vl = nth_line(buffer, buffer->line_off);
945 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
946 		wmove(win, l, 0);
947 		print_vline(x_offset, width, win, vl);
948 		l++;
949 		if (l == height)
950 			break;
951 	}
952 
953 end:
954 	wmove(win, buffer->curs_y, buffer->curs_x);
955 }
956 
957 static void
958 redraw_help(void)
959 {
960 	redraw_window(help, help_lines, help_cols, &helpwin);
961 }
962 
963 static void
964 redraw_body(struct tab *tab)
965 {
966 	static struct tab *last_tab;
967 
968 	if (last_tab != tab)
969 		tab->buffer.force_redraw =1;
970 	last_tab = tab;
971 
972 	redraw_window(body, body_lines, body_cols, &tab->buffer);
973 }
974 
975 static inline char
976 trust_status_char(enum trust_state ts)
977 {
978 	switch (ts) {
979 	case TS_UNKNOWN:	return 'u';
980 	case TS_UNTRUSTED:	return '!';
981 	case TS_TRUSTED:	return 'v';
982 	case TS_VERIFIED:	return 'V';
983 	default:		return 'X';
984 	}
985 }
986 
987 static void
988 redraw_modeline(struct tab *tab)
989 {
990 	double		 pct;
991 	int		 x, y, max_x, max_y;
992 	const char	*mode = tab->buffer.page.name;
993 	const char	*spin = "-\\|/";
994 
995 	werase(modeline);
996 	wattr_on(modeline, modeline_face.background, NULL);
997 	wmove(modeline, 0, 0);
998 
999 	wprintw(modeline, "-%c%c %s ",
1000 	    spin[tab->loading_anim_step],
1001 	    trust_status_char(tab->trust),
1002 	    mode == NULL ? "(none)" : mode);
1003 
1004 	pct = (tab->buffer.line_off + tab->buffer.curs_y) * 100.0 / tab->buffer.line_max;
1005 
1006 	if (tab->buffer.line_max <= (size_t)body_lines)
1007                 wprintw(modeline, "All ");
1008 	else if (tab->buffer.line_off == 0)
1009                 wprintw(modeline, "Top ");
1010 	else if (tab->buffer.line_off + body_lines >= tab->buffer.line_max)
1011 		wprintw(modeline, "Bottom ");
1012 	else
1013 		wprintw(modeline, "%.0f%% ", pct);
1014 
1015 	wprintw(modeline, "%d/%d %s ",
1016 	    tab->buffer.line_off + tab->buffer.curs_y,
1017 	    tab->buffer.line_max,
1018 	    tab->hist_cur->h);
1019 
1020 	getyx(modeline, y, x);
1021 	getmaxyx(modeline, max_y, max_x);
1022 
1023 	(void)y;
1024 	(void)max_y;
1025 
1026 	for (; x < max_x; ++x)
1027 		waddstr(modeline, "-");
1028 
1029 	wattr_off(modeline, modeline_face.background, NULL);
1030 }
1031 
1032 static void
1033 redraw_minibuffer(void)
1034 {
1035 	struct tab *tab;
1036 	size_t off_y, off_x = 0;
1037 	char *start = NULL, *c = NULL;
1038 
1039 	/* unused, but set by getyx */
1040 	(void)off_y;
1041 
1042 	wattr_on(minibuf, minibuffer_face.background, NULL);
1043 	werase(minibuf);
1044 
1045 	if (in_minibuffer) {
1046 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1047 		if (ministate.hist_cur != NULL)
1048 			wprintw(minibuf, "(%zu/%zu) ",
1049 			    ministate.hist_off + 1,
1050 			    ministate.history->len);
1051 
1052 		getyx(minibuf, off_y, off_x);
1053 
1054 		start = ministate.hist_cur != NULL
1055 			? ministate.hist_cur->h
1056 			: ministate.buf;
1057 		c = utf8_nth(ministate.buffer.current_line->line,
1058 		    ministate.buffer.cpoff);
1059 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1060 			start = utf8_next_cp(start);
1061 		}
1062 
1063 		waddstr(minibuf, start);
1064 	}
1065 
1066 	if (ministate.curmesg != NULL)
1067                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1068 		    ministate.curmesg);
1069 
1070 	if (!in_minibuffer && ministate.curmesg == NULL)
1071 		waddstr(minibuf, keybuf);
1072 
1073 	/* If nothing else, show the URL at point */
1074 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1075 		tab = current_tab();
1076 		if (tab->buffer.current_line != NULL &&
1077 		    tab->buffer.current_line->parent->type == LINE_LINK)
1078 			waddstr(minibuf, tab->buffer.current_line->parent->alt);
1079 	}
1080 
1081 	if (in_minibuffer)
1082 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1083 
1084 	wattr_off(minibuf, minibuffer_face.background, NULL);
1085 }
1086 
1087 static void
1088 redraw_tab(struct tab *tab)
1089 {
1090 	if (side_window) {
1091 		redraw_help();
1092 		wnoutrefresh(help);
1093 	}
1094 
1095 	restore_cursor(&tab->buffer);
1096 
1097 	redraw_tabline();
1098 	redraw_body(tab);
1099 	redraw_modeline(tab);
1100 	redraw_minibuffer();
1101 
1102 	wnoutrefresh(tabline);
1103 	wnoutrefresh(modeline);
1104 
1105 	if (in_minibuffer) {
1106 		wnoutrefresh(body);
1107 		wnoutrefresh(minibuf);
1108 	} else {
1109 		wnoutrefresh(minibuf);
1110 		wnoutrefresh(body);
1111 	}
1112 
1113 	doupdate();
1114 }
1115 
1116 static void
1117 emit_help_item(char *prfx, void *fn)
1118 {
1119 	struct line	*l;
1120 	struct cmd	*cmd;
1121 
1122 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1123 		if (fn == cmd->fn)
1124 			break;
1125 	}
1126 	assert(cmd != NULL);
1127 
1128 	if ((l = calloc(1, sizeof(*l))) == NULL)
1129 		abort();
1130 
1131 	l->type = LINE_TEXT;
1132 	l->alt = NULL;
1133 
1134 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1135 
1136 	if (TAILQ_EMPTY(&helpwin.page.head))
1137 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1138 	else
1139 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1140 }
1141 
1142 static void
1143 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1144 {
1145 	struct keymap	*k;
1146 	char		 p[32];
1147 	const char	*kn;
1148 
1149 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1150 		strlcpy(p, prfx, sizeof(p));
1151 		if (*p != '\0')
1152 			strlcat(p, " ", sizeof(p));
1153 		if (k->meta)
1154 			strlcat(p, "M-", sizeof(p));
1155 		if ((kn = unkbd(k->key)) != NULL)
1156 			strlcat(p, kn, sizeof(p));
1157 		else
1158 			strlcat(p, keyname(k->key), sizeof(p));
1159 
1160 		if (k->fn == NULL)
1161 			rec_compute_help(&k->map, p, sizeof(p));
1162 		else
1163 			emit_help_item(p, k->fn);
1164 	}
1165 }
1166 
1167 static void
1168 recompute_help(void)
1169 {
1170 	char	p[32] = { 0 };
1171 
1172 	empty_vlist(&helpwin);
1173 	empty_linelist(&helpwin);
1174 	rec_compute_help(current_map, p, sizeof(p));
1175 	wrap_page(&helpwin, help_cols);
1176 }
1177 
1178 void
1179 vmessage(const char *fmt, va_list ap)
1180 {
1181 	if (evtimer_pending(&clminibufev, NULL))
1182 		evtimer_del(&clminibufev);
1183 
1184 	free(ministate.curmesg);
1185 	ministate.curmesg = NULL;
1186 
1187 	if (fmt != NULL) {
1188 		evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1189 		evtimer_add(&clminibufev, &clminibufev_timer);
1190 
1191 		/* TODO: what to do if the allocation fails here? */
1192 		if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1193 			ministate.curmesg = NULL;
1194 	}
1195 
1196 	redraw_minibuffer();
1197 	if (in_minibuffer) {
1198 		wrefresh(body);
1199 		wrefresh(minibuf);
1200 	} else {
1201 		wrefresh(minibuf);
1202 		wrefresh(body);
1203 	}
1204 }
1205 
1206 void
1207 message(const char *fmt, ...)
1208 {
1209 	va_list ap;
1210 
1211 	va_start(ap, fmt);
1212 	vmessage(fmt, ap);
1213 	va_end(ap);
1214 }
1215 
1216 void
1217 start_loading_anim(struct tab *tab)
1218 {
1219 	if (tab->loading_anim)
1220 		return;
1221 	tab->loading_anim = 1;
1222 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1223 	evtimer_add(&tab->loadingev, &loadingev_timer);
1224 }
1225 
1226 static void
1227 update_loading_anim(int fd, short ev, void *d)
1228 {
1229 	struct tab	*tab = d;
1230 
1231 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1232 
1233 	if (tab->flags & TAB_CURRENT) {
1234 		redraw_modeline(tab);
1235 		wrefresh(modeline);
1236 		wrefresh(body);
1237 		if (in_minibuffer)
1238 			wrefresh(minibuf);
1239 	}
1240 
1241 	evtimer_add(&tab->loadingev, &loadingev_timer);
1242 }
1243 
1244 static void
1245 stop_loading_anim(struct tab *tab)
1246 {
1247 	if (!tab->loading_anim)
1248 		return;
1249 	evtimer_del(&tab->loadingev);
1250 	tab->loading_anim = 0;
1251 	tab->loading_anim_step = 0;
1252 
1253 	if (!(tab->flags & TAB_CURRENT))
1254 		return;
1255 
1256 	redraw_modeline(tab);
1257 
1258 	wrefresh(modeline);
1259 	wrefresh(body);
1260 	if (in_minibuffer)
1261 		wrefresh(minibuf);
1262 }
1263 
1264 void
1265 load_url_in_tab(struct tab *tab, const char *url)
1266 {
1267 	message("Loading %s...", url);
1268 	start_loading_anim(tab);
1269 	load_url(tab, url);
1270 
1271 	tab->buffer.curs_x = 0;
1272 	tab->buffer.curs_y = 0;
1273 	redraw_tab(tab);
1274 }
1275 
1276 void
1277 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1278     void (*abortfn)(void), struct histhead *hist)
1279 {
1280 	in_minibuffer = 1;
1281 	base_map = &minibuffer_map;
1282 	current_map = &minibuffer_map;
1283 
1284 	base_map->unhandled_input = self_insert_fn;
1285 
1286 	ministate.donefn = donefn;
1287 	ministate.abortfn = abortfn;
1288 	memset(ministate.buf, 0, sizeof(ministate.buf));
1289 	ministate.buffer.current_line = &ministate.vline;
1290 	ministate.buffer.current_line->line = ministate.buf;
1291 	ministate.buffer.cpoff = 0;
1292 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1293 
1294 	ministate.history = hist;
1295 	ministate.hist_cur = NULL;
1296 	ministate.hist_off = 0;
1297 }
1298 
1299 void
1300 exit_minibuffer(void)
1301 {
1302 	werase(minibuf);
1303 
1304 	in_minibuffer = 0;
1305 	base_map = &global_map;
1306 	current_map = &global_map;
1307 }
1308 
1309 void
1310 switch_to_tab(struct tab *tab)
1311 {
1312 	struct tab	*t;
1313 
1314 	TAILQ_FOREACH(t, &tabshead, tabs) {
1315 		t->flags &= ~TAB_CURRENT;
1316 	}
1317 
1318 	tab->flags |= TAB_CURRENT;
1319 	tab->flags &= ~TAB_URGENT;
1320 }
1321 
1322 unsigned int
1323 tab_new_id(void)
1324 {
1325 	return tab_counter++;
1326 }
1327 
1328 struct tab *
1329 new_tab(const char *url)
1330 {
1331 	struct tab	*tab;
1332 
1333 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1334 		event_loopbreak();
1335 		return NULL;
1336 	}
1337 	tab->fd = -1;
1338 
1339 	TAILQ_INIT(&tab->hist.head);
1340 
1341 	TAILQ_INIT(&tab->buffer.head);
1342 
1343 	tab->id = tab_new_id();
1344 	switch_to_tab(tab);
1345 
1346 	if (TAILQ_EMPTY(&tabshead))
1347 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1348 	else
1349 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1350 
1351 	load_url_in_tab(tab, url);
1352 	return tab;
1353 }
1354 
1355 static void
1356 session_new_tab_cb(const char *url)
1357 {
1358 	new_tab(url);
1359 }
1360 
1361 static void
1362 usage(void)
1363 {
1364 	fprintf(stderr, "USAGE: %s [-hn] [-c config] [url]\n", getprogname());
1365 	fprintf(stderr, "version: " PACKAGE " " VERSION "\n");
1366 }
1367 
1368 int
1369 ui_init(int argc, char * const *argv)
1370 {
1371 	char path[PATH_MAX];
1372 	const char *url = NEW_TAB_URL;
1373 	int ch, configtest = 0, fonf = 0;
1374 
1375 	if (getenv("NO_COLOR") != NULL)
1376 		enable_colors = 0;
1377 
1378 	strlcpy(path, getenv("HOME"), sizeof(path));
1379 	strlcat(path, "/.telescope/config", sizeof(path));
1380 
1381 	while ((ch = getopt(argc, argv, "c:hn")) != -1) {
1382 		switch (ch) {
1383 		case 'c':
1384 			fonf = 1;
1385 			strlcpy(path, optarg, sizeof(path));
1386 			break;
1387 		case 'n':
1388 			configtest = 1;
1389 			break;
1390 		case 'h':
1391 			usage();
1392 			return 0;
1393 		default:
1394 			usage();
1395 			return 1;
1396 		}
1397 	}
1398 	argc -= optind;
1399 	argv += optind;
1400 
1401 	/* setup keys before reading the config */
1402 	TAILQ_INIT(&global_map.m);
1403 	global_map.unhandled_input = global_key_unbound;
1404 
1405 	TAILQ_INIT(&minibuffer_map.m);
1406 
1407 	load_default_keys();
1408 
1409 	config_init();
1410 	parseconfig(path, fonf);
1411 	if (configtest){
1412 		puts("config OK");
1413 		exit(0);
1414 	}
1415 
1416 	if (argc != 0)
1417 		url = argv[0];
1418 
1419 	setlocale(LC_ALL, "");
1420 
1421 	TAILQ_INIT(&eecmd_history.head);
1422 	TAILQ_INIT(&ir_history.head);
1423 	TAILQ_INIT(&lu_history.head);
1424 
1425 	ministate.line.type = LINE_TEXT;
1426 	ministate.vline.parent = &ministate.line;
1427 	ministate.buffer.current_line = &ministate.vline;
1428 
1429 	/* initialize help window */
1430 	TAILQ_INIT(&helpwin.head);
1431 
1432 	base_map = &global_map;
1433 	current_map = &global_map;
1434 
1435 	initscr();
1436 
1437 	if (enable_colors) {
1438 		if (has_colors()) {
1439 			start_color();
1440 			use_default_colors();
1441 		} else
1442 			enable_colors = 0;
1443 	}
1444 
1445 	config_apply_style();
1446 
1447 	raw();
1448 	noecho();
1449 	nonl();
1450 	intrflush(stdscr, FALSE);
1451 
1452 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1453 		return 0;
1454 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1455 		return 0;
1456 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1457 		return 0;
1458 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1459 		return 0;
1460 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1461 		return 0;
1462 
1463 	body_lines = LINES-3;
1464 	body_cols = COLS;
1465 
1466 	wbkgd(body, body_face.body);
1467 	wbkgd(minibuf, minibuffer_face.background);
1468 
1469 	update_x_offset();
1470 
1471 	keypad(body, TRUE);
1472 	scrollok(body, FALSE);
1473 
1474 	/* non-blocking input */
1475 	wtimeout(body, 0);
1476 
1477 	mvwprintw(body, 0, 0, "");
1478 
1479 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1480 	event_add(&stdioev, NULL);
1481 
1482 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1483 	signal_add(&winchev, NULL);
1484 
1485 	load_last_session(session_new_tab_cb);
1486 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
1487 		new_tab(url);
1488 
1489 	return 1;
1490 }
1491 
1492 void
1493 ui_on_tab_loaded(struct tab *tab)
1494 {
1495 	stop_loading_anim(tab);
1496 	message("Loaded %s", tab->hist_cur->h);
1497 
1498 	redraw_tabline();
1499 	wrefresh(tabline);
1500 	if (in_minibuffer)
1501 		wrefresh(minibuf);
1502 	else
1503 		wrefresh(body);
1504 }
1505 
1506 void
1507 ui_on_tab_refresh(struct tab *tab)
1508 {
1509 	wrap_page(&tab->buffer, body_cols);
1510 	if (tab->flags & TAB_CURRENT) {
1511 		restore_cursor(&tab->buffer);
1512 		redraw_tab(tab);
1513 	} else
1514 		tab->flags |= TAB_URGENT;
1515 }
1516 
1517 const char *
1518 ui_keyname(int k)
1519 {
1520 	return keyname(k);
1521 }
1522 
1523 void
1524 ui_toggle_side_window(void)
1525 {
1526 	side_window = !side_window;
1527 	if (side_window)
1528 		recompute_help();
1529 
1530 	/*
1531 	 * ugly hack, but otherwise the window doesn't get updated
1532 	 * until I call handle_resize a second time (i.e. C-l).  I
1533 	 * will be happy to know why something like this is needed.
1534 	 */
1535 	handle_resize_nodelay(0, 0, NULL);
1536 	handle_resize_nodelay(0, 0, NULL);
1537 }
1538 
1539 void
1540 ui_schedule_redraw(void)
1541 {
1542 	handle_resize_nodelay(0, 0, NULL);
1543 }
1544 
1545 void
1546 ui_require_input(struct tab *tab, int hide)
1547 {
1548 	/* TODO: hard-switching to another tab is ugly */
1549 	switch_to_tab(tab);
1550 
1551 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1552 	    &ir_history);
1553 	strlcpy(ministate.prompt, "Input required: ",
1554 	    sizeof(ministate.prompt));
1555 	redraw_tab(tab);
1556 }
1557 
1558 void
1559 ui_yornp(const char *prompt, void (*fn)(int, unsigned int),
1560     unsigned int data)
1561 {
1562 	size_t len;
1563 
1564 	if (in_minibuffer) {
1565 		fn(0, data);
1566 		return;
1567 	}
1568 
1569 	yornp_cb = fn;
1570 	yornp_data = data;
1571 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
1572 	    yornp_abort, NULL);
1573 
1574 	len = sizeof(ministate.prompt);
1575 	strlcpy(ministate.prompt, prompt, len);
1576 	strlcat(ministate.prompt, " (y or n) ", len);
1577 	redraw_tab(current_tab());
1578 }
1579 
1580 void
1581 ui_read(const char *prompt, void (*fn)(const char*, unsigned int),
1582     unsigned int data)
1583 {
1584 	size_t len;
1585 
1586 	if (in_minibuffer)
1587 		return;
1588 
1589 	read_cb = fn;
1590 	read_data = data;
1591 	enter_minibuffer(read_self_insert, read_select, read_abort,
1592 	    &read_history);
1593 
1594 	len = sizeof(ministate.prompt);
1595 	strlcpy(ministate.prompt, prompt, len);
1596 	strlcat(ministate.prompt, ": ", len);
1597 	redraw_tab(current_tab());
1598 }
1599 
1600 void
1601 ui_end(void)
1602 {
1603 	endwin();
1604 }