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Date:: Sat Aug 14 20:10:47 2021 UTC
Message:: move load_url_in_tab, switch_to_tab, new_tab{,_id} to telescope.c
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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  *
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 "compat.h"
34 
35 #include <assert.h>
36 #include <curses.h>
37 #include <locale.h>
38 #include <signal.h>
39 #include <stdarg.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <unistd.h>
43 
44 #include "defaults.h"
45 #include "minibuffer.h"
46 #include "telescope.h"
47 #include "ui.h"
48 #include "utf8.h"
49 
50 static struct event	stdioev, winchev;
51 
52 static void		 restore_curs_x(struct buffer *);
53 
54 static int		 readkey(void);
55 static void		 dispatch_stdio(int, short, void*);
56 static void		 handle_resize(int, short, void*);
57 static void		 handle_resize_nodelay(int, short, void*);
58 static void		 rearrange_windows(void);
59 static void		 line_prefix_and_text(struct vline *, char *, size_t, const char **, const char **);
60 static void		 print_vline(int, int, WINDOW*, struct vline*);
61 static void		 redraw_tabline(void);
62 static void		 redraw_window(WINDOW*, int, int, int, struct buffer*);
63 static void		 redraw_help(void);
64 static void		 redraw_body(struct tab*);
65 static void		 redraw_modeline(struct tab*);
66 static void		 redraw_minibuffer(void);
67 static void		 do_redraw_echoarea(void);
68 static void		 do_redraw_minibuffer(void);
69 static void		 do_redraw_minibuffer_compl(void);
70 static void		 place_cursor(int);
71 static void		 redraw_tab(struct tab*);
72 static void		 update_loading_anim(int, short, void*);
73 static void		 stop_loading_anim(struct tab*);
74 
75 static int		 should_rearrange_windows;
76 static int		 too_small;
77 static int		 x_offset;
78 
79 struct thiskey	 thiskey;
80 struct tab	*current_tab;
81 
82 static struct event	resizeev;
83 static struct timeval	resize_timer = { 0, 250000 };
84 
85 static WINDOW	*tabline, *body, *modeline, *echoarea, *minibuffer;
86 
87 int			 body_lines, body_cols;
88 
89 static WINDOW		*help;
90 /* not static so we can see them from help.c */
91 struct buffer		 helpwin;
92 int			 help_lines, help_cols;
93 
94 static int		 side_window;
95 static int		 in_side_window;
96 
97 static struct timeval	loadingev_timer = { 0, 250000 };
98 
99 static char	keybuf[64];
100 
101 /* XXX: don't forget to init these in main() */
102 struct kmap global_map,
103 	minibuffer_map,
104 	*current_map,
105 	*base_map;
106 
107 static inline void
108 update_x_offset(void)
109 {
110 	if (olivetti_mode && fill_column < body_cols)
111 		x_offset = (body_cols - fill_column)/2;
112 	else
113 		x_offset = 0;
114 }
115 
116 void
117 save_excursion(struct excursion *place, struct buffer *buffer)
118 {
119 	place->curs_x = buffer->curs_x;
120 	place->curs_y = buffer->curs_y;
121 	place->line_off = buffer->line_off;
122 	place->top_line = buffer->top_line;
123 	place->current_line = buffer->current_line;
124 	place->cpoff = buffer->cpoff;
125 }
126 
127 void
128 restore_excursion(struct excursion *place, struct buffer *buffer)
129 {
130 	buffer->curs_x = place->curs_x;
131 	buffer->curs_y = place->curs_y;
132 	buffer->line_off = place->line_off;
133 	buffer->top_line = place->top_line;
134 	buffer->current_line = place->current_line;
135 	buffer->cpoff = place->cpoff;
136 }
137 
138 static void
139 restore_curs_x(struct buffer *buffer)
140 {
141 	struct vline	*vl;
142 	const char	*prfx, *text;
143 
144 	vl = buffer->current_line;
145 	if (vl == NULL || vl->line == NULL)
146 		buffer->curs_x = buffer->cpoff = 0;
147 	else if (vl->parent->data != NULL) {
148 		text = vl->parent->data;
149 		buffer->curs_x = utf8_snwidth(text + 1, buffer->cpoff) + 1;
150 	} else
151 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
152 
153 	buffer->curs_x += x_offset;
154 
155 	if (vl == NULL)
156 		return;
157 
158 	if (vl->parent->data != NULL)
159 		buffer->curs_x += utf8_swidth_between(vl->parent->line,
160 		    vl->parent->data);
161 	else {
162 		prfx = line_prefixes[vl->parent->type].prfx1;
163 		buffer->curs_x += utf8_swidth(prfx);
164 	}
165 }
166 
167 void
168 global_key_unbound(void)
169 {
170 	message("%s is undefined", keybuf);
171 }
172 
173 struct buffer *
174 current_buffer(void)
175 {
176 	if (in_minibuffer)
177 		return &ministate.buffer;
178 	if (in_side_window)
179 		return &helpwin;
180 	return &current_tab->buffer;
181 }
182 
183 static int
184 readkey(void)
185 {
186 	uint32_t state = 0;
187 
188 	if ((thiskey.key = wgetch(body)) == ERR)
189 		return 0;
190 
191 	thiskey.meta = thiskey.key == 27;
192 	if (thiskey.meta) {
193 		thiskey.key = wgetch(body);
194 		if (thiskey.key == ERR || thiskey.key == 27) {
195 			thiskey.meta = 0;
196 			thiskey.key = 27;
197 		}
198 	}
199 
200 	thiskey.cp = 0;
201 
202 	if ((unsigned int)thiskey.key >= UINT8_MAX)
203 		return 1;
204 
205 	while (1) {
206 		if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
207 			break;
208 		if ((thiskey.key = wgetch(body)) == ERR) {
209 			message("Error decoding user input");
210 			return 0;
211 		}
212 	}
213 
214 	return 1;
215 }
216 
217 static void
218 dispatch_stdio(int fd, short ev, void *d)
219 {
220 	struct keymap	*k;
221 	const char	*keyname;
222 	char		 tmp[5] = {0};
223 
224 	/* TODO: schedule a redraw? */
225 	if (too_small)
226 		return;
227 
228 	if (!readkey())
229 		return;
230 
231 	if (keybuf[0] != '\0')
232 		strlcat(keybuf, " ", sizeof(keybuf));
233 	if (thiskey.meta)
234 		strlcat(keybuf, "M-", sizeof(keybuf));
235 	if (thiskey.cp != 0) {
236 		utf8_encode(thiskey.cp, tmp);
237 		strlcat(keybuf, tmp, sizeof(keybuf));
238 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
239 		strlcat(keybuf, keyname, sizeof(keybuf));
240 	} else {
241 		tmp[0] = thiskey.key;
242 		strlcat(keybuf, tmp, sizeof(keybuf));
243 	}
244 
245 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
246 		if (k->meta == thiskey.meta &&
247 		    k->key == thiskey.key) {
248 			if (k->fn == NULL)
249 				current_map = &k->map;
250 			else {
251 				current_map = base_map;
252 				strlcpy(keybuf, "", sizeof(keybuf));
253 				k->fn(current_buffer());
254 			}
255 			goto done;
256 		}
257 	}
258 
259 	if (current_map->unhandled_input != NULL)
260 		current_map->unhandled_input();
261 	else
262 		global_key_unbound();
263 
264 	strlcpy(keybuf, "", sizeof(keybuf));
265 	current_map = base_map;
266 
267 done:
268 	if (side_window)
269 		recompute_help();
270 
271 	if (should_rearrange_windows)
272 		rearrange_windows();
273 	redraw_tab(current_tab);
274 }
275 
276 static void
277 handle_resize(int sig, short ev, void *d)
278 {
279 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
280 		event_del(&resizeev);
281 	}
282 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
283 	evtimer_add(&resizeev, &resize_timer);
284 }
285 
286 static void
287 handle_resize_nodelay(int s, short ev, void *d)
288 {
289 	endwin();
290 	refresh();
291 	clear();
292 
293 	rearrange_windows();
294 }
295 
296 static void
297 rearrange_windows(void)
298 {
299 	int		 lines;
300 
301 	should_rearrange_windows = 0;
302 
303 	lines = LINES;
304 
305 	if ((too_small = lines < 15)) {
306 		erase();
307 		printw("Window too small.");
308 		refresh();
309 		return;
310 	}
311 
312 	/* move and resize the windows, in reverse order! */
313 
314 	if (in_minibuffer == MB_COMPREAD) {
315 		mvwin(minibuffer, lines-10, 0);
316 		wresize(minibuffer, 10, COLS);
317 		lines -= 10;
318 
319 		wrap_page(&ministate.compl.buffer, COLS);
320 	}
321 
322 	mvwin(echoarea, --lines, 0);
323 	wresize(echoarea, 1, COLS);
324 
325 	mvwin(modeline, --lines, 0);
326 	wresize(modeline, 1, COLS);
327 
328 	body_lines = --lines;
329 	body_cols = COLS;
330 
331 	if (side_window) {
332 		help_cols = 0.3 * COLS;
333 		help_lines = lines;
334 		mvwin(help, 1, 0);
335 		wresize(help, help_lines, help_cols);
336 
337 		wrap_page(&helpwin, help_cols);
338 
339 		body_cols = COLS - help_cols - 1;
340 		mvwin(body, 1, help_cols);
341 	} else
342 		mvwin(body, 1, 0);
343 
344 	update_x_offset();
345 	wresize(body, body_lines, body_cols);
346 
347 	wresize(tabline, 1, COLS);
348 
349 	wrap_page(&current_tab->buffer, body_cols);
350 	redraw_tab(current_tab);
351 }
352 
353 static void
354 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
355     const char **prfx_ret, const char **text_ret)
356 {
357 	int type, i, cont, width;
358 	char *space, *t;
359 
360 	if ((*text_ret = vl->line) == NULL)
361 		*text_ret = "";
362 
363 	cont = vl->flags & L_CONTINUATION;
364 	type = vl->parent->type;
365 	if (!cont)
366 		*prfx_ret = line_prefixes[type].prfx1;
367 	else
368 		*prfx_ret = line_prefixes[type].prfx2;
369 
370 	space = vl->parent->data;
371 	if (!emojify_link || type != LINE_LINK || space == NULL)
372 		return;
373 
374 	if (cont) {
375 		memset(buf, 0, len);
376 		width = utf8_swidth_between(vl->parent->line, space);
377 		for (i = 0; i < width + 1; ++i)
378 			strlcat(buf, " ", len);
379 	} else {
380 		strlcpy(buf, *text_ret, len);
381 		if ((t = strchr(buf, ' ')) != NULL)
382 			*t = '\0';
383 		strlcat(buf, " ", len);
384 
385 		/* skip the emoji */
386                 *text_ret += (space - vl->parent->line) + 1;
387 	}
388 
389 	*prfx_ret = buf;
390 }
391 
392 static inline void
393 print_vline_descr(int width, WINDOW *window, struct vline *vl)
394 {
395 	int x, y, goal;
396 
397 	if (vl->parent->type != LINE_COMPL &&
398 	    vl->parent->type != LINE_COMPL_CURRENT &&
399 	    vl->parent->type != LINE_HELP)
400 		return;
401 
402 	if (vl->parent->alt == NULL)
403 		return;
404 
405 	(void)y;
406 	getyx(window, y, x);
407 
408 	if (vl->parent->type == LINE_HELP)
409 		goal = 8;
410 	else
411 		goal = width/2;
412 
413 	if (goal <= x)
414 		wprintw(window, " ");
415 	for (; goal > x; ++x)
416 		wprintw(window, " ");
417 
418 	wprintw(window, "%s", vl->parent->alt);
419 }
420 
421 /*
422  * Core part of the rendering.  It prints a vline starting from the
423  * current cursor position.  Printing a vline consists of skipping
424  * `off' columns (for olivetti-mode), print the correct prefix (which
425  * may be the emoji in case of emojified links-lines), printing the
426  * text itself, filling until width - off and filling off columns
427  * again.
428  */
429 static void
430 print_vline(int off, int width, WINDOW *window, struct vline *vl)
431 {
432 	/*
433 	 * Believe me or not, I've seen emoji ten code points long!
434 	 * That means, to stay large, 4*10 bytes + NUL.
435 	 */
436 	char emojibuf[41] = {0};
437 	const char *text, *prfx;
438 	struct line_face *f;
439 	int i, left, x, y;
440 
441 	f = &line_faces[vl->parent->type];
442 
443 	/* unused, set by getyx */
444 	(void)y;
445 
446 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
447 
448 	wattr_on(window, body_face.left, NULL);
449 	for (i = 0; i < off; i++)
450 		waddch(window, ' ');
451 	wattr_off(window, body_face.left, NULL);
452 
453 	wattr_on(window, f->prefix, NULL);
454 	wprintw(window, "%s", prfx);
455 	wattr_off(window, f->prefix, NULL);
456 
457 	wattr_on(window, f->text, NULL);
458 	wprintw(window, "%s", text);
459 	print_vline_descr(width, window, vl);
460 	wattr_off(window, f->text, NULL);
461 
462 	getyx(window, y, x);
463 
464 	left = width - x;
465 
466 	wattr_on(window, f->trail, NULL);
467 	for (i = 0; i < left - off; ++i)
468 		waddch(window, ' ');
469 	wattr_off(window, f->trail, NULL);
470 
471 	wattr_on(window, body_face.right, NULL);
472 	for (i = 0; i < off; i++)
473 		waddch(window, ' ');
474 	wattr_off(window, body_face.right, NULL);
475 
476 }
477 
478 static void
479 redraw_tabline(void)
480 {
481 	struct tab	*tab;
482 	size_t		 toskip, ots, tabwidth, space, x;
483 	int		 current, y, truncated, pair;
484 	const char	*title;
485 	char		 buf[25];
486 
487 	x = 0;
488 
489 	/* unused, but setted by a getyx */
490 	(void)y;
491 
492 	tabwidth = sizeof(buf)+1;
493 	space = COLS-2;
494 
495 	toskip = 0;
496 	TAILQ_FOREACH(tab, &tabshead, tabs) {
497 		toskip++;
498 		if (tab == current_tab)
499 			break;
500 	}
501 
502 	if (toskip * tabwidth < space)
503 		toskip = 0;
504 	else {
505 		ots = toskip;
506 		toskip--;
507                 while (toskip != 0 &&
508 		    (ots - toskip+1) * tabwidth < space)
509 			toskip--;
510 	}
511 
512 	werase(tabline);
513 	wattr_on(tabline, tab_face.background, NULL);
514 	wprintw(tabline, toskip == 0 ? " " : "<");
515 	wattr_off(tabline, tab_face.background, NULL);
516 
517 	truncated = 0;
518 	TAILQ_FOREACH(tab, &tabshead, tabs) {
519 		if (truncated)
520 			break;
521 		if (toskip != 0) {
522 			toskip--;
523 			continue;
524 		}
525 
526 		getyx(tabline, y, x);
527 		if (x + sizeof(buf)+2 >= (size_t)COLS)
528 			truncated = 1;
529 
530 		current = tab == current_tab;
531 
532 		if (*(title = tab->buffer.page.title) == '\0')
533 			title = tab->hist_cur->h;
534 
535 		if (tab->flags & TAB_URGENT)
536 			strlcpy(buf, "!", sizeof(buf));
537 		else
538 			strlcpy(buf, " ", sizeof(buf));
539 
540                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
541 			/* truncation happens */
542 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
543 		} else {
544 			/* pad with spaces */
545 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
546 				/* nop */ ;
547 		}
548 
549 		pair = current ? tab_face.current : tab_face.tab;
550 		wattr_on(tabline, pair, NULL);
551 		wprintw(tabline, "%s", buf);
552 		wattr_off(tabline, pair, NULL);
553 
554 		wattr_on(tabline, tab_face.background, NULL);
555 		if (TAILQ_NEXT(tab, tabs) != NULL)
556 			wprintw(tabline, "┃");
557 		wattr_off(tabline, tab_face.background, NULL);
558 	}
559 
560 	wattr_on(tabline, tab_face.background, NULL);
561 	for (; x < (size_t)COLS; ++x)
562 		waddch(tabline, ' ');
563 	if (truncated)
564 		mvwprintw(tabline, 0, COLS-1, ">");
565 	wattr_off(tabline, tab_face.background, NULL);
566 }
567 
568 /*
569  * Compute the first visible line around vl.  Try to search forward
570  * until the end of the buffer; if a visible line is not found, search
571  * backward.  Return NULL if no viable line was found.
572  */
573 struct vline *
574 adjust_line(struct vline *vl, struct buffer *buffer)
575 {
576 	struct vline *t;
577 
578 	if (vl == NULL)
579 		return NULL;
580 
581 	if (!(vl->parent->flags & L_HIDDEN))
582 		return vl;
583 
584 	/* search forward */
585 	for (t = vl;
586 	     t != NULL && t->parent->flags & L_HIDDEN;
587 	     t = TAILQ_NEXT(t, vlines))
588 		;		/* nop */
589 
590 	if (t != NULL)
591 		return t;
592 
593 	/* search backward */
594 	for (t = vl;
595 	     t != NULL && t->parent->flags & L_HIDDEN;
596 	     t = TAILQ_PREV(t, vhead, vlines))
597 		;		/* nop */
598 
599 	return t;
600 }
601 
602 static void
603 redraw_window(WINDOW *win, int off, int height, int width,
604     struct buffer *buffer)
605 {
606 	struct vline	*vl;
607 	int		 l, onscreen;
608 
609 	restore_curs_x(buffer);
610 
611 	/*
612 	 * TODO: ignoring buffer->force_update and always
613 	 * re-rendering.  In theory we can recompute the y position
614 	 * without a re-render, and optimize here.  It's not the only
615 	 * optimisation possible here, wscrl wolud also be an
616 	 * interesting one.
617 	 */
618 
619 again:
620 	werase(win);
621 	buffer->curs_y = 0;
622 
623 	if (TAILQ_EMPTY(&buffer->head))
624 		goto end;
625 
626 	if (buffer->top_line == NULL)
627 		buffer->top_line = TAILQ_FIRST(&buffer->head);
628 
629 	buffer->top_line = adjust_line(buffer->top_line, buffer);
630 	if (buffer->top_line == NULL)
631 		goto end;
632 
633 	buffer->current_line = adjust_line(buffer->current_line, buffer);
634 
635 	l = 0;
636 	onscreen = 0;
637 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
638 		if (vl->parent->flags & L_HIDDEN)
639 			continue;
640 
641 		wmove(win, l, 0);
642 		print_vline(off, width, win, vl);
643 
644 		if (vl == buffer->current_line)
645 			onscreen = 1;
646 
647 		if (!onscreen)
648 			buffer->curs_y++;
649 
650 		l++;
651 		if (l == height)
652 			break;
653 	}
654 
655 	if (!onscreen) {
656 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
657 			if (vl == buffer->current_line)
658 				break;
659 			if (vl->parent->flags & L_HIDDEN)
660 				continue;
661 			buffer->line_off++;
662 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
663 		}
664 
665 		if (vl != NULL)
666 			goto again;
667 	}
668 
669 	buffer->last_line_off = buffer->line_off;
670 	buffer->force_redraw = 0;
671 end:
672 	wmove(win, buffer->curs_y, buffer->curs_x);
673 }
674 
675 static void
676 redraw_help(void)
677 {
678 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
679 }
680 
681 static void
682 redraw_body(struct tab *tab)
683 {
684 	static struct tab *last_tab;
685 
686 	if (last_tab != tab)
687 		tab->buffer.force_redraw =1;
688 	last_tab = tab;
689 
690 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
691 }
692 
693 static inline char
694 trust_status_char(enum trust_state ts)
695 {
696 	switch (ts) {
697 	case TS_UNKNOWN:	return '-';
698 	case TS_UNTRUSTED:	return '!';
699 	case TS_TEMP_TRUSTED:	return '!';
700 	case TS_TRUSTED:	return 'v';
701 	case TS_VERIFIED:	return 'V';
702 	default:		return 'X';
703 	}
704 }
705 
706 static void
707 redraw_modeline(struct tab *tab)
708 {
709 	struct buffer	*buffer;
710 	double		 pct;
711 	int		 x, y, max_x, max_y;
712 	const char	*mode;
713 	const char	*spin = "-\\|/";
714 
715 	buffer = current_buffer();
716 	mode = buffer->page.name;
717 
718 	werase(modeline);
719 	wattr_on(modeline, modeline_face.background, NULL);
720 	wmove(modeline, 0, 0);
721 
722 	wprintw(modeline, "-%c%c %s ",
723 	    spin[tab->loading_anim_step],
724 	    trust_status_char(tab->trust),
725 	    mode == NULL ? "(none)" : mode);
726 
727 	pct = (buffer->line_off + buffer->curs_y) * 100.0
728 		/ buffer->line_max;
729 
730 	if (buffer->line_max <= (size_t)body_lines)
731                 wprintw(modeline, "All ");
732 	else if (buffer->line_off == 0)
733                 wprintw(modeline, "Top ");
734 	else if (buffer->line_off + body_lines >= buffer->line_max)
735 		wprintw(modeline, "Bottom ");
736 	else
737 		wprintw(modeline, "%.0f%% ", pct);
738 
739 	wprintw(modeline, "%d/%d %s ",
740 	    buffer->line_off + buffer->curs_y,
741 	    buffer->line_max,
742 	    tab->hist_cur->h);
743 
744 	getyx(modeline, y, x);
745 	getmaxyx(modeline, max_y, max_x);
746 
747 	(void)y;
748 	(void)max_y;
749 
750 	for (; x < max_x; ++x)
751 		waddstr(modeline, "-");
752 
753 	wattr_off(modeline, modeline_face.background, NULL);
754 }
755 
756 static void
757 redraw_minibuffer(void)
758 {
759 	wattr_on(echoarea, minibuffer_face.background, NULL);
760 	werase(echoarea);
761 
762 	if (in_minibuffer)
763 		do_redraw_minibuffer();
764 	else
765 		do_redraw_echoarea();
766 
767 	if (in_minibuffer == MB_COMPREAD)
768 		do_redraw_minibuffer_compl();
769 
770 	wattr_off(echoarea, minibuffer_face.background, NULL);
771 }
772 
773 static void
774 do_redraw_echoarea(void)
775 {
776 	struct vline *vl;
777 
778 	if (ministate.curmesg != NULL)
779                 wprintw(echoarea, "%s", ministate.curmesg);
780 	else if (*keybuf != '\0')
781 		waddstr(echoarea, keybuf);
782 	else {
783 		/* If nothing else, show the URL at point */
784 		vl = current_tab->buffer.current_line;
785 		if (vl != NULL && vl->parent->type == LINE_LINK)
786 			waddstr(echoarea, vl->parent->alt);
787 	}
788 }
789 
790 static void
791 do_redraw_minibuffer(void)
792 {
793 	struct buffer	*cmplbuf, *buffer;
794 	size_t		 off_y, off_x = 0;
795 	const char	*start, *c;
796 
797 	cmplbuf = &ministate.compl.buffer;
798 	buffer = &ministate.buffer;
799 	(void)off_y;		/* unused, set by getyx */
800 
801 	wmove(echoarea, 0, 0);
802 
803 	if (in_minibuffer == MB_COMPREAD)
804 		wprintw(echoarea, "(%2d) ",
805 		    cmplbuf->line_max);
806 
807 	wprintw(echoarea, "%s", ministate.prompt);
808 	if (ministate.hist_cur != NULL)
809 		wprintw(echoarea, "(%zu/%zu) ",
810 		    ministate.hist_off + 1,
811 		    ministate.history->len);
812 
813 	getyx(echoarea, off_y, off_x);
814 
815 	start = ministate.hist_cur != NULL
816 		? ministate.hist_cur->h
817 		: ministate.buf;
818 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
819 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
820 		start = utf8_next_cp(start);
821 	}
822 
823 	waddstr(echoarea, start);
824 
825 	if (ministate.curmesg != NULL)
826 		wprintw(echoarea, " [%s]", ministate.curmesg);
827 
828 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
829 }
830 
831 static void
832 do_redraw_minibuffer_compl(void)
833 {
834 	redraw_window(minibuffer, 0, 10, COLS,
835 	    &ministate.compl.buffer);
836 }
837 
838 /*
839  * Place the cursor in the right ncurses window.  If soft is 1, use
840  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
841  * wrefresh.
842  */
843 static void
844 place_cursor(int soft)
845 {
846 	int (*touch)(WINDOW *);
847 
848 	if (soft)
849 		touch = wnoutrefresh;
850 	else
851 		touch = wrefresh;
852 
853 	if (in_minibuffer) {
854 		if (side_window)
855 			touch(help);
856 		touch(body);
857 		touch(echoarea);
858 	} else if (in_side_window) {
859 		touch(body);
860 		touch(echoarea);
861 		touch(help);
862 	} else {
863 		if (side_window)
864 			touch(help);
865 		touch(echoarea);
866 		touch(body);
867 	}
868 }
869 
870 static void
871 redraw_tab(struct tab *tab)
872 {
873 	if (too_small)
874 		return;
875 
876 	if (side_window) {
877 		redraw_help();
878 		wnoutrefresh(help);
879 	}
880 
881 	redraw_tabline();
882 	redraw_body(tab);
883 	redraw_modeline(tab);
884 	redraw_minibuffer();
885 
886 	wnoutrefresh(tabline);
887 	wnoutrefresh(modeline);
888 
889 	if (in_minibuffer == MB_COMPREAD)
890 		wnoutrefresh(minibuffer);
891 
892 	place_cursor(1);
893 
894 	doupdate();
895 
896 	if (set_title)
897 		dprintf(1, "\033]0;%s - Telescope\a",
898 		    current_tab->buffer.page.title);
899 }
900 
901 void
902 start_loading_anim(struct tab *tab)
903 {
904 	if (tab->loading_anim)
905 		return;
906 	tab->loading_anim = 1;
907 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
908 	evtimer_add(&tab->loadingev, &loadingev_timer);
909 }
910 
911 static void
912 update_loading_anim(int fd, short ev, void *d)
913 {
914 	struct tab	*tab = d;
915 
916 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
917 
918 	if (tab == current_tab) {
919 		redraw_modeline(tab);
920 		wrefresh(modeline);
921 		wrefresh(body);
922 		if (in_minibuffer)
923 			wrefresh(echoarea);
924 	}
925 
926 	evtimer_add(&tab->loadingev, &loadingev_timer);
927 }
928 
929 static void
930 stop_loading_anim(struct tab *tab)
931 {
932 	if (!tab->loading_anim)
933 		return;
934 	evtimer_del(&tab->loadingev);
935 	tab->loading_anim = 0;
936 	tab->loading_anim_step = 0;
937 
938 	if (tab != current_tab)
939 		return;
940 
941 	redraw_modeline(tab);
942 
943 	wrefresh(modeline);
944 	wrefresh(body);
945 	if (in_minibuffer)
946 		wrefresh(echoarea);
947 }
948 
949 int
950 ui_print_colors(void)
951 {
952 	int colors = 0, pairs = 0, can_change = 0;
953 	int columns = 16, lines, color, i, j;
954 
955 	initscr();
956 	if (has_colors()) {
957 		start_color();
958 		use_default_colors();
959 
960 		colors = COLORS;
961 		pairs = COLOR_PAIRS;
962 		can_change = can_change_color();
963 	}
964 	endwin();
965 
966 	printf("Term info:\n");
967 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
968 	    getenv("TERM"), colors, pairs, can_change);
969 	printf("\n");
970 
971 	if (colors == 0) {
972 		printf("No color support\n");
973 		return 0;
974 	}
975 
976 	printf("Available colors:\n\n");
977 	lines = (colors - 1) / columns + 1;
978 	color = 0;
979 	for (i = 0; i < lines; ++i) {
980 		for (j = 0; j < columns; ++j, ++color) {
981 			printf("\033[0;38;5;%dm %03d", color, color);
982 		}
983 		printf("\n");
984 	}
985 
986 	printf("\033[0m");
987 	fflush(stdout);
988 	return 0;
989 }
990 
991 int
992 ui_init()
993 {
994 	setlocale(LC_ALL, "");
995 
996 	if (TAILQ_EMPTY(&global_map.m)) {
997 		fprintf(stderr, "no keys defined!\n");
998 		return 0;
999 	}
1000 
1001 	minibuffer_init();
1002 
1003 	/* initialize help window */
1004 	TAILQ_INIT(&helpwin.head);
1005 	TAILQ_INIT(&helpwin.page.head);
1006 
1007 	base_map = &global_map;
1008 	current_map = &global_map;
1009 
1010 	initscr();
1011 
1012 	if (enable_colors) {
1013 		if (has_colors()) {
1014 			start_color();
1015 			use_default_colors();
1016 		} else
1017 			enable_colors = 0;
1018 	}
1019 
1020 	config_apply_style();
1021 
1022 	raw();
1023 	noecho();
1024 	nonl();
1025 	intrflush(stdscr, FALSE);
1026 
1027 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1028 		return 0;
1029 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1030 		return 0;
1031 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1032 		return 0;
1033 	if ((echoarea = newwin(1, COLS, LINES-1, 0)) == NULL)
1034 		return 0;
1035 	if ((minibuffer = newwin(1, COLS, LINES-1, 0)) == NULL)
1036 		return 0;
1037 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1038 		return 0;
1039 
1040 	body_lines = LINES-3;
1041 	body_cols = COLS;
1042 
1043 	wbkgd(body, body_face.body);
1044 	wbkgd(echoarea, minibuffer_face.background);
1045 
1046 	update_x_offset();
1047 
1048 	keypad(body, TRUE);
1049 	scrollok(body, FALSE);
1050 
1051 	/* non-blocking input */
1052 	wtimeout(body, 0);
1053 	wtimeout(help, 0);
1054 
1055 	mvwprintw(body, 0, 0, "");
1056 
1057 	evtimer_set(&resizeev, handle_resize, NULL);
1058 
1059 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1060 	event_add(&stdioev, NULL);
1061 
1062 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1063 	signal_add(&winchev, NULL);
1064 
1065 	return 1;
1066 }
1067 
1068 void
1069 ui_main_loop(void)
1070 {
1071 	switch_to_tab(current_tab);
1072 	redraw_tab(current_tab);
1073 
1074 	event_dispatch();
1075 }
1076 
1077 void
1078 ui_on_tab_loaded(struct tab *tab)
1079 {
1080 	stop_loading_anim(tab);
1081 	message("Loaded %s", tab->hist_cur->h);
1082 
1083 	redraw_tabline();
1084 	wrefresh(tabline);
1085 	place_cursor(0);
1086 }
1087 
1088 void
1089 ui_on_tab_refresh(struct tab *tab)
1090 {
1091 	wrap_page(&tab->buffer, body_cols);
1092 	if (tab == current_tab)
1093 		redraw_tab(tab);
1094 	else
1095 		tab->flags |= TAB_URGENT;
1096 }
1097 
1098 const char *
1099 ui_keyname(int k)
1100 {
1101 	return keyname(k);
1102 }
1103 
1104 void
1105 ui_toggle_side_window(void)
1106 {
1107 	side_window = !side_window;
1108 	if (side_window)
1109 		recompute_help();
1110 	else
1111 		in_side_window = 0;
1112 
1113 	/*
1114 	 * ugly hack, but otherwise the window doesn't get updated
1115 	 * until I call rearrange_windows a second time (e.g. via
1116 	 * C-l).  I will be happy to know why something like this is
1117 	 * needed.
1118 	 */
1119 	rearrange_windows();
1120 	rearrange_windows();
1121 }
1122 
1123 void
1124 ui_schedule_redraw(void)
1125 {
1126 	should_rearrange_windows = 1;
1127 }
1128 
1129 void
1130 ui_require_input(struct tab *tab, int hide, int proto)
1131 {
1132 	void (*fn)(void);
1133 
1134 	if (proto == PROTO_GEMINI)
1135 		fn = ir_select_gemini;
1136 	else if (proto == PROTO_GOPHER)
1137 		fn = ir_select_gopher;
1138 	else
1139 		abort();
1140 
1141 	/* TODO: hard-switching to another tab is ugly */
1142 	switch_to_tab(tab);
1143 
1144 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1145 	    &ir_history, NULL, NULL);
1146 	strlcpy(ministate.prompt, "Input required: ",
1147 	    sizeof(ministate.prompt));
1148 	redraw_tab(tab);
1149 }
1150 
1151 void
1152 ui_after_message_hook(void)
1153 {
1154 	redraw_minibuffer();
1155 	place_cursor(0);
1156 }
1157 
1158 void
1159 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1160     struct tab *data)
1161 {
1162 	yornp(prompt, fn, data);
1163 	redraw_tab(current_tab);
1164 }
1165 
1166 void
1167 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1168     struct tab *data)
1169 {
1170 	minibuffer_read(prompt, fn, data);
1171 	redraw_tab(current_tab);
1172 }
1173 
1174 void
1175 ui_other_window(void)
1176 {
1177 	if (side_window)
1178 		in_side_window = !in_side_window;
1179 	else
1180 		message("No other window to select");
1181 }
1182 
1183 void
1184 ui_suspend(void)
1185 {
1186 	endwin();
1187 
1188 	kill(getpid(), SIGSTOP);
1189 
1190 	refresh();
1191 	clear();
1192 	rearrange_windows();
1193 }
1194 
1195 void
1196 ui_end(void)
1197 {
1198 	endwin();
1199 }