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