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Date:: Fri Nov 5 20:54:38 2021 UTC
Message:: extract the key matching logic to its own function
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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 "session.h"
47 #include "telescope.h"
48 #include "ui.h"
49 #include "utf8.h"
50 
51 static struct event	stdioev, winchev;
52 
53 static void		 restore_curs_x(struct buffer *);
54 
55 static int		 readkey(void);
56 static void		 dispatch_stdio(int, short, void*);
57 static void		 handle_resize(int, short, void*);
58 static void		 handle_resize_nodelay(int, short, void*);
59 static void		 rearrange_windows(void);
60 static void		 line_prefix_and_text(struct vline *, char *, size_t, const char **, const char **);
61 static void		 print_vline(int, int, WINDOW*, struct vline*);
62 static void		 redraw_tabline(void);
63 static void		 redraw_window(WINDOW*, int, int, int, struct buffer*);
64 static void		 redraw_download(void);
65 static void		 redraw_help(void);
66 static void		 redraw_body(struct tab*);
67 static void		 redraw_modeline(struct tab*);
68 static void		 redraw_minibuffer(void);
69 static void		 do_redraw_echoarea(void);
70 static void		 do_redraw_minibuffer(void);
71 static void		 do_redraw_minibuffer_compl(void);
72 static void		 place_cursor(int);
73 static void		 redraw_tab(struct tab*);
74 static void		 update_loading_anim(int, short, void*);
75 static void		 stop_loading_anim(struct tab*);
76 
77 static int		 should_rearrange_windows;
78 static int		 show_tab_bar;
79 static int		 too_small;
80 static int		 x_offset;
81 
82 struct thiskey	 thiskey;
83 struct tab	*current_tab;
84 
85 static struct event	resizeev;
86 static struct timeval	resize_timer = { 0, 250000 };
87 
88 static WINDOW	*tabline, *body, *modeline, *echoarea, *minibuffer;
89 
90 int			 body_lines, body_cols;
91 
92 static WINDOW		*help;
93 /* not static so we can see them from help.c */
94 struct buffer		 helpwin;
95 int			 help_lines, help_cols;
96 
97 static WINDOW		*download;
98 /* not static so we can see them from download.c */
99 struct buffer		 downloadwin;
100 int			 download_lines;
101 
102 static int		 side_window;
103 static int		 in_side_window;
104 
105 static struct timeval	loadingev_timer = { 0, 250000 };
106 
107 static char	keybuf[64];
108 
109 /* XXX: don't forget to init these in main() */
110 struct kmap global_map,
111 	minibuffer_map,
112 	*current_map,
113 	*base_map;
114 
115 static inline void
116 update_x_offset(void)
117 {
118 	if (olivetti_mode && fill_column < body_cols)
119 		x_offset = (body_cols - fill_column)/2;
120 	else
121 		x_offset = 0;
122 }
123 
124 void
125 save_excursion(struct excursion *place, struct buffer *buffer)
126 {
127 	place->curs_x = buffer->curs_x;
128 	place->curs_y = buffer->curs_y;
129 	place->line_off = buffer->line_off;
130 	place->top_line = buffer->top_line;
131 	place->current_line = buffer->current_line;
132 	place->cpoff = buffer->cpoff;
133 }
134 
135 void
136 restore_excursion(struct excursion *place, struct buffer *buffer)
137 {
138 	buffer->curs_x = place->curs_x;
139 	buffer->curs_y = place->curs_y;
140 	buffer->line_off = place->line_off;
141 	buffer->top_line = place->top_line;
142 	buffer->current_line = place->current_line;
143 	buffer->cpoff = place->cpoff;
144 }
145 
146 static void
147 restore_curs_x(struct buffer *buffer)
148 {
149 	struct vline	*vl;
150 	const char	*prfx, *text;
151 
152 	vl = buffer->current_line;
153 	if (vl == NULL || vl->line == NULL)
154 		buffer->curs_x = buffer->cpoff = 0;
155 	else if (vl->parent->data != NULL) {
156 		text = vl->parent->data;
157 		buffer->curs_x = utf8_snwidth(text + 1, buffer->cpoff) + 1;
158 	} else
159 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
160 
161 	/* small hack: don't olivetti-mode the download pane */
162 	if (buffer != &downloadwin)
163 		buffer->curs_x += x_offset;
164 
165 	if (vl == NULL)
166 		return;
167 
168 	if (vl->parent->data != NULL)
169 		buffer->curs_x += utf8_swidth_between(vl->parent->line,
170 		    vl->parent->data);
171 	else {
172 		prfx = line_prefixes[vl->parent->type].prfx1;
173 		buffer->curs_x += utf8_swidth(prfx);
174 	}
175 }
176 
177 void
178 global_key_unbound(void)
179 {
180 	message("%s is undefined", keybuf);
181 }
182 
183 struct buffer *
184 current_buffer(void)
185 {
186 	if (in_minibuffer)
187 		return &ministate.buffer;
188 	if (in_side_window & SIDE_WINDOW_LEFT)
189 		return &helpwin;
190 	if (in_side_window & SIDE_WINDOW_BOTTOM)
191 		return &downloadwin;
192 	return &current_tab->buffer;
193 }
194 
195 static int
196 readkey(void)
197 {
198 	uint32_t state = 0;
199 
200 	if ((thiskey.key = wgetch(body)) == ERR)
201 		return 0;
202 
203 	thiskey.meta = thiskey.key == 27;
204 	if (thiskey.meta) {
205 		thiskey.key = wgetch(body);
206 		if (thiskey.key == ERR || thiskey.key == 27) {
207 			thiskey.meta = 0;
208 			thiskey.key = 27;
209 		}
210 	}
211 
212 	thiskey.cp = 0;
213 
214 	if ((unsigned int)thiskey.key >= UINT8_MAX)
215 		return 1;
216 
217 	while (1) {
218 		if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
219 			break;
220 		if ((thiskey.key = wgetch(body)) == ERR) {
221 			message("Error decoding user input");
222 			return 0;
223 		}
224 	}
225 
226 	return 1;
227 }
228 
229 static void
230 dispatch_stdio(int fd, short ev, void *d)
231 {
232 	int		 lk;
233 	const char	*keyname;
234 	char		 tmp[5] = {0};
235 
236 	/* TODO: schedule a redraw? */
237 	if (too_small)
238 		return;
239 
240 	if (!readkey())
241 		return;
242 
243 	if (keybuf[0] != '\0')
244 		strlcat(keybuf, " ", sizeof(keybuf));
245 	if (thiskey.meta)
246 		strlcat(keybuf, "M-", sizeof(keybuf));
247 	if (thiskey.cp != 0) {
248 		utf8_encode(thiskey.cp, tmp);
249 		strlcat(keybuf, tmp, sizeof(keybuf));
250 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
251 		strlcat(keybuf, keyname, sizeof(keybuf));
252 	} else {
253 		tmp[0] = thiskey.key;
254 		strlcat(keybuf, tmp, sizeof(keybuf));
255 	}
256 
257 	lk = lookup_key(&current_map, &thiskey, current_buffer());
258 	if (lk == LK_UNBOUND) {
259 		if (current_map->unhandled_input != NULL)
260 			current_map->unhandled_input();
261 		else
262 			global_key_unbound();
263 	}
264 	if (lk != LK_ADVANCED_MAP) {
265 		current_map = base_map;
266 		strlcpy(keybuf, "", sizeof(keybuf));
267 	}
268 
269 	if (side_window & SIDE_WINDOW_LEFT)
270 		recompute_help();
271 
272 	if (should_rearrange_windows)
273 		rearrange_windows();
274 	redraw_tab(current_tab);
275 }
276 
277 static void
278 handle_resize(int sig, short ev, void *d)
279 {
280 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
281 		event_del(&resizeev);
282 	}
283 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
284 	evtimer_add(&resizeev, &resize_timer);
285 }
286 
287 static void
288 handle_resize_nodelay(int s, short ev, void *d)
289 {
290 	endwin();
291 	refresh();
292 	clear();
293 
294 	rearrange_windows();
295 }
296 
297 static inline int
298 should_show_tab_bar(void)
299 {
300 	if (tab_bar_show == -1)
301 		return 0;
302 	if (tab_bar_show == 0)
303 		return 1;
304 
305 	return TAILQ_NEXT(TAILQ_FIRST(&tabshead), tabs) != NULL;
306 }
307 
308 static void
309 rearrange_windows(void)
310 {
311 	int		 lines;
312 	int		 minibuffer_lines;
313 
314 	should_rearrange_windows = 0;
315 	show_tab_bar = should_show_tab_bar();
316 
317 	lines = LINES;
318 
319 	/* 3 lines for the ui and 12 for the  */
320 	if ((too_small = lines < 15)) {
321 		erase();
322 		printw("Window too small.");
323 		refresh();
324 		return;
325 	}
326 
327 	/* move and resize the windows, in reverse order! */
328 
329 	if (in_minibuffer == MB_COMPREAD) {
330 		minibuffer_lines = MIN(10, lines/2);
331 		mvwin(minibuffer, lines - minibuffer_lines, 0);
332 		wresize(minibuffer, minibuffer_lines, COLS);
333 		lines -= minibuffer_lines;
334 
335 		wrap_page(&ministate.compl.buffer, COLS);
336 	}
337 
338 	mvwin(echoarea, --lines, 0);
339 	wresize(echoarea, 1, COLS);
340 
341 	mvwin(modeline, --lines, 0);
342 	wresize(modeline, 1, COLS);
343 
344 	if (side_window & SIDE_WINDOW_BOTTOM) {
345 		download_lines = MIN(5, lines/2);
346 		mvwin(download, lines - download_lines, 0);
347 		wresize(download, download_lines, COLS);
348 		lines -= download_lines;
349 
350 		wrap_page(&downloadwin, COLS);
351 	}
352 
353 	body_lines = show_tab_bar ? --lines : lines;
354 	body_cols = COLS;
355 
356 	/*
357 	 * Here we make the assumption that show_tab_bar is either 0
358 	 * or 1, and reuse that as argument to mvwin.
359 	 */
360 	if (side_window & SIDE_WINDOW_LEFT) {
361 		help_cols = 0.3 * COLS;
362 		help_lines = lines;
363 		mvwin(help, show_tab_bar, 0);
364 		wresize(help, help_lines, help_cols);
365 
366 		wrap_page(&helpwin, help_cols);
367 
368 		body_cols = COLS - help_cols - 1;
369 		mvwin(body, show_tab_bar, help_cols);
370 	} else
371 		mvwin(body, show_tab_bar, 0);
372 
373 	update_x_offset();
374 	wresize(body, body_lines, body_cols);
375 
376 	if (show_tab_bar)
377 		wresize(tabline, 1, COLS);
378 
379 	wrap_page(&current_tab->buffer, body_cols);
380 	redraw_tab(current_tab);
381 }
382 
383 static void
384 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
385     const char **prfx_ret, const char **text_ret)
386 {
387 	int type, i, cont, width;
388 	char *space, *t;
389 
390 	if ((*text_ret = vl->line) == NULL)
391 		*text_ret = "";
392 
393 	cont = vl->flags & L_CONTINUATION;
394 	type = vl->parent->type;
395 	if (!cont)
396 		*prfx_ret = line_prefixes[type].prfx1;
397 	else
398 		*prfx_ret = line_prefixes[type].prfx2;
399 
400 	space = vl->parent->data;
401 	if (!emojify_link || type != LINE_LINK || space == NULL)
402 		return;
403 
404 	if (cont) {
405 		memset(buf, 0, len);
406 		width = utf8_swidth_between(vl->parent->line, space);
407 		for (i = 0; i < width + 1; ++i)
408 			strlcat(buf, " ", len);
409 	} else {
410 		strlcpy(buf, *text_ret, len);
411 		if ((t = strchr(buf, ' ')) != NULL)
412 			*t = '\0';
413 		strlcat(buf, " ", len);
414 
415 		/* skip the emoji */
416 		*text_ret += (space - vl->parent->line) + 1;
417 	}
418 
419 	*prfx_ret = buf;
420 }
421 
422 static inline void
423 print_vline_descr(int width, WINDOW *window, struct vline *vl)
424 {
425 	int x, y, goal;
426 
427 	switch (vl->parent->type) {
428 	case LINE_COMPL:
429 	case LINE_COMPL_CURRENT:
430 		goal = width/2;
431 		break;
432 	case LINE_DOWNLOAD:
433 	case LINE_DOWNLOAD_DONE:
434 		goal = width/4;
435 		break;
436 	case LINE_HELP:
437 		goal = 8;
438 		break;
439 	default:
440 		return;
441 	}
442 
443 	if (vl->parent->alt == NULL)
444 		return;
445 
446 	(void)y;
447 	getyx(window, y, x);
448 
449 	if (goal <= x)
450 		wprintw(window, " ");
451 	for (; goal > x; ++x)
452 		wprintw(window, " ");
453 
454 	wprintw(window, "%s", vl->parent->alt);
455 }
456 
457 /*
458  * Core part of the rendering.  It prints a vline starting from the
459  * current cursor position.  Printing a vline consists of skipping
460  * `off' columns (for olivetti-mode), print the correct prefix (which
461  * may be the emoji in case of emojified links-lines), printing the
462  * text itself, filling until width - off and filling off columns
463  * again.
464  */
465 static void
466 print_vline(int off, int width, WINDOW *window, struct vline *vl)
467 {
468 	/*
469 	 * Believe me or not, I've seen emoji ten code points long!
470 	 * That means, to stay large, 4*10 bytes + NUL.
471 	 */
472 	char emojibuf[41] = {0};
473 	const char *text, *prfx;
474 	struct line_face *f;
475 	int i, left, x, y;
476 
477 	f = &line_faces[vl->parent->type];
478 
479 	/* unused, set by getyx */
480 	(void)y;
481 
482 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
483 
484 	wattr_on(window, body_face.left, NULL);
485 	for (i = 0; i < off; i++)
486 		waddch(window, ' ');
487 	wattr_off(window, body_face.left, NULL);
488 
489 	wattr_on(window, f->prefix, NULL);
490 	wprintw(window, "%s", prfx);
491 	wattr_off(window, f->prefix, NULL);
492 
493 	wattr_on(window, f->text, NULL);
494 	wprintw(window, "%s", text);
495 	print_vline_descr(width, window, vl);
496 	wattr_off(window, f->text, NULL);
497 
498 	getyx(window, y, x);
499 
500 	left = width - x;
501 
502 	wattr_on(window, f->trail, NULL);
503 	for (i = 0; i < left - off; ++i)
504 		waddch(window, ' ');
505 	wattr_off(window, f->trail, NULL);
506 
507 	wattr_on(window, body_face.right, NULL);
508 	for (i = 0; i < off; i++)
509 		waddch(window, ' ');
510 	wattr_off(window, body_face.right, NULL);
511 
512 }
513 
514 static void
515 redraw_tabline(void)
516 {
517 	struct tab	*tab;
518 	size_t		 toskip, ots, tabwidth, space, x;
519 	int		 current, y, truncated, pair;
520 	const char	*title;
521 	char		 buf[25];
522 
523 	x = 0;
524 
525 	/* unused, but setted by a getyx */
526 	(void)y;
527 
528 	tabwidth = sizeof(buf)+1;
529 	space = COLS-2;
530 
531 	toskip = 0;
532 	TAILQ_FOREACH(tab, &tabshead, tabs) {
533 		toskip++;
534 		if (tab == current_tab)
535 			break;
536 	}
537 
538 	if (toskip * tabwidth < space)
539 		toskip = 0;
540 	else {
541 		ots = toskip;
542 		toskip--;
543 		while (toskip != 0 &&
544 		    (ots - toskip+1) * tabwidth < space)
545 			toskip--;
546 	}
547 
548 	werase(tabline);
549 	wattr_on(tabline, tab_face.background, NULL);
550 	wprintw(tabline, toskip == 0 ? " " : "<");
551 	wattr_off(tabline, tab_face.background, NULL);
552 
553 	truncated = 0;
554 	TAILQ_FOREACH(tab, &tabshead, tabs) {
555 		if (truncated)
556 			break;
557 		if (toskip != 0) {
558 			toskip--;
559 			continue;
560 		}
561 
562 		getyx(tabline, y, x);
563 		if (x + sizeof(buf)+2 >= (size_t)COLS)
564 			truncated = 1;
565 
566 		current = tab == current_tab;
567 
568 		if (*(title = tab->buffer.page.title) == '\0')
569 			title = tab->hist_cur->h;
570 
571 		if (tab->flags & TAB_URGENT)
572 			strlcpy(buf, "!", sizeof(buf));
573 		else
574 			strlcpy(buf, " ", sizeof(buf));
575 
576 		if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
577 			/* truncation happens */
578 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
579 		} else {
580 			/* pad with spaces */
581 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
582 				/* nop */ ;
583 		}
584 
585 		pair = current ? tab_face.current : tab_face.tab;
586 		wattr_on(tabline, pair, NULL);
587 		wprintw(tabline, "%s", buf);
588 		wattr_off(tabline, pair, NULL);
589 
590 		wattr_on(tabline, tab_face.background, NULL);
591 		if (TAILQ_NEXT(tab, tabs) != NULL)
592 			wprintw(tabline, "┃");
593 		wattr_off(tabline, tab_face.background, NULL);
594 	}
595 
596 	wattr_on(tabline, tab_face.background, NULL);
597 	for (; x < (size_t)COLS; ++x)
598 		waddch(tabline, ' ');
599 	if (truncated)
600 		mvwprintw(tabline, 0, COLS-1, ">");
601 	wattr_off(tabline, tab_face.background, NULL);
602 }
603 
604 /*
605  * Compute the first visible line around vl.  Try to search forward
606  * until the end of the buffer; if a visible line is not found, search
607  * backward.  Return NULL if no viable line was found.
608  */
609 struct vline *
610 adjust_line(struct vline *vl, struct buffer *buffer)
611 {
612 	struct vline *t;
613 
614 	if (vl == NULL)
615 		return NULL;
616 
617 	if (!(vl->parent->flags & L_HIDDEN))
618 		return vl;
619 
620 	/* search forward */
621 	for (t = vl;
622 	     t != NULL && t->parent->flags & L_HIDDEN;
623 	     t = TAILQ_NEXT(t, vlines))
624 		;		/* nop */
625 
626 	if (t != NULL)
627 		return t;
628 
629 	/* search backward */
630 	for (t = vl;
631 	     t != NULL && t->parent->flags & L_HIDDEN;
632 	     t = TAILQ_PREV(t, vhead, vlines))
633 		;		/* nop */
634 
635 	return t;
636 }
637 
638 static void
639 redraw_window(WINDOW *win, int off, int height, int width,
640     struct buffer *buffer)
641 {
642 	struct vline	*vl;
643 	int		 l, onscreen;
644 
645 	restore_curs_x(buffer);
646 
647 	/*
648 	 * TODO: ignoring buffer->force_update and always
649 	 * re-rendering.  In theory we can recompute the y position
650 	 * without a re-render, and optimize here.  It's not the only
651 	 * optimisation possible here, wscrl wolud also be an
652 	 * interesting one.
653 	 */
654 
655 again:
656 	werase(win);
657 	buffer->curs_y = 0;
658 
659 	if (TAILQ_EMPTY(&buffer->head))
660 		goto end;
661 
662 	if (buffer->top_line == NULL)
663 		buffer->top_line = TAILQ_FIRST(&buffer->head);
664 
665 	buffer->top_line = adjust_line(buffer->top_line, buffer);
666 	if (buffer->top_line == NULL)
667 		goto end;
668 
669 	buffer->current_line = adjust_line(buffer->current_line, buffer);
670 
671 	l = 0;
672 	onscreen = 0;
673 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
674 		if (vl->parent->flags & L_HIDDEN)
675 			continue;
676 
677 		wmove(win, l, 0);
678 		print_vline(off, width, win, vl);
679 
680 		if (vl == buffer->current_line)
681 			onscreen = 1;
682 
683 		if (!onscreen)
684 			buffer->curs_y++;
685 
686 		l++;
687 		if (l == height)
688 			break;
689 	}
690 
691 	if (!onscreen) {
692 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
693 			if (vl == buffer->current_line)
694 				break;
695 			if (vl->parent->flags & L_HIDDEN)
696 				continue;
697 			buffer->line_off++;
698 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
699 		}
700 
701 		if (vl != NULL)
702 			goto again;
703 	}
704 
705 	buffer->last_line_off = buffer->line_off;
706 	buffer->force_redraw = 0;
707 end:
708 	wmove(win, buffer->curs_y, buffer->curs_x);
709 }
710 
711 static void
712 redraw_download(void)
713 {
714 	redraw_window(download, 0, download_lines, COLS, &downloadwin);
715 }
716 
717 static void
718 redraw_help(void)
719 {
720 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
721 }
722 
723 static void
724 redraw_body(struct tab *tab)
725 {
726 	static struct tab *last_tab;
727 
728 	if (last_tab != tab)
729 		tab->buffer.force_redraw =1;
730 	last_tab = tab;
731 
732 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
733 }
734 
735 static inline char
736 trust_status_char(enum trust_state ts)
737 {
738 	switch (ts) {
739 	case TS_UNKNOWN:	return '-';
740 	case TS_UNTRUSTED:	return '!';
741 	case TS_TEMP_TRUSTED:	return '!';
742 	case TS_TRUSTED:	return 'v';
743 	case TS_VERIFIED:	return 'V';
744 	default:		return 'X';
745 	}
746 }
747 
748 static void
749 redraw_modeline(struct tab *tab)
750 {
751 	struct buffer	*buffer;
752 	double		 pct;
753 	int		 x, y, max_x, max_y;
754 	const char	*mode;
755 	const char	*spin = "-\\|/";
756 
757 	buffer = current_buffer();
758 	mode = buffer->page.name;
759 
760 	werase(modeline);
761 	wattr_on(modeline, modeline_face.background, NULL);
762 	wmove(modeline, 0, 0);
763 
764 	wprintw(modeline, "-%c%c %s ",
765 	    spin[tab->loading_anim_step],
766 	    trust_status_char(tab->trust),
767 	    mode == NULL ? "(none)" : mode);
768 
769 	pct = (buffer->line_off + buffer->curs_y) * 100.0
770 		/ buffer->line_max;
771 
772 	if (buffer->line_max <= (size_t)body_lines)
773 		wprintw(modeline, "All ");
774 	else if (buffer->line_off == 0)
775 		wprintw(modeline, "Top ");
776 	else if (buffer->line_off + body_lines >= buffer->line_max)
777 		wprintw(modeline, "Bottom ");
778 	else
779 		wprintw(modeline, "%.0f%% ", pct);
780 
781 	wprintw(modeline, "%d/%d %s ",
782 	    buffer->line_off + buffer->curs_y,
783 	    buffer->line_max,
784 	    tab->hist_cur->h);
785 
786 	getyx(modeline, y, x);
787 	getmaxyx(modeline, max_y, max_x);
788 
789 	(void)y;
790 	(void)max_y;
791 
792 	for (; x < max_x; ++x)
793 		waddstr(modeline, "-");
794 
795 	wattr_off(modeline, modeline_face.background, NULL);
796 }
797 
798 static void
799 redraw_minibuffer(void)
800 {
801 	wattr_on(echoarea, minibuffer_face.background, NULL);
802 	werase(echoarea);
803 
804 	if (in_minibuffer)
805 		do_redraw_minibuffer();
806 	else
807 		do_redraw_echoarea();
808 
809 	if (in_minibuffer == MB_COMPREAD)
810 		do_redraw_minibuffer_compl();
811 
812 	wattr_off(echoarea, minibuffer_face.background, NULL);
813 }
814 
815 static void
816 do_redraw_echoarea(void)
817 {
818 	struct vline *vl;
819 
820 	if (ministate.curmesg != NULL)
821 		wprintw(echoarea, "%s", ministate.curmesg);
822 	else if (*keybuf != '\0')
823 		waddstr(echoarea, keybuf);
824 	else {
825 		/* If nothing else, show the URL at point */
826 		vl = current_tab->buffer.current_line;
827 		if (vl != NULL && vl->parent->type == LINE_LINK)
828 			waddstr(echoarea, vl->parent->alt);
829 	}
830 }
831 
832 static void
833 do_redraw_minibuffer(void)
834 {
835 	struct buffer	*cmplbuf, *buffer;
836 	size_t		 off_y, off_x = 0;
837 	const char	*start, *c;
838 
839 	cmplbuf = &ministate.compl.buffer;
840 	buffer = &ministate.buffer;
841 	(void)off_y;		/* unused, set by getyx */
842 
843 	wmove(echoarea, 0, 0);
844 
845 	if (in_minibuffer == MB_COMPREAD)
846 		wprintw(echoarea, "(%2d) ",
847 		    cmplbuf->line_max);
848 
849 	wprintw(echoarea, "%s", ministate.prompt);
850 	if (ministate.hist_cur != NULL)
851 		wprintw(echoarea, "(%zu/%zu) ",
852 		    ministate.hist_off + 1,
853 		    ministate.history->len);
854 
855 	getyx(echoarea, off_y, off_x);
856 
857 	start = ministate.hist_cur != NULL
858 		? ministate.hist_cur->h
859 		: ministate.buf;
860 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
861 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
862 		start = utf8_next_cp(start);
863 	}
864 
865 	waddstr(echoarea, start);
866 
867 	if (ministate.curmesg != NULL)
868 		wprintw(echoarea, " [%s]", ministate.curmesg);
869 
870 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
871 }
872 
873 static void
874 do_redraw_minibuffer_compl(void)
875 {
876 	redraw_window(minibuffer, 0, 10, COLS,
877 	    &ministate.compl.buffer);
878 }
879 
880 /*
881  * Place the cursor in the right ncurses window.  If soft is 1, use
882  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
883  * wrefresh.
884  */
885 static void
886 place_cursor(int soft)
887 {
888 	int (*touch)(WINDOW *);
889 
890 	if (soft)
891 		touch = wnoutrefresh;
892 	else
893 		touch = wrefresh;
894 
895 	if (in_minibuffer) {
896 		if (side_window & SIDE_WINDOW_LEFT)
897 			touch(help);
898 		if (side_window & SIDE_WINDOW_BOTTOM)
899 			touch(download);
900 		touch(body);
901 		touch(echoarea);
902 	} else if (in_side_window & SIDE_WINDOW_LEFT) {
903 		touch(body);
904 		touch(echoarea);
905                 if (in_side_window & SIDE_WINDOW_BOTTOM)
906 			touch(download);
907 		touch(help);
908 	} else if (in_side_window & SIDE_WINDOW_BOTTOM) {
909 		touch(body);
910 		touch(echoarea);
911 		if (in_side_window & SIDE_WINDOW_LEFT)
912 			touch(help);
913 		touch(download);
914 	} else {
915 		if (side_window & SIDE_WINDOW_LEFT)
916 			touch(help);
917 		if (side_window & SIDE_WINDOW_BOTTOM)
918 			touch(download);
919 		touch(echoarea);
920 		touch(body);
921 	}
922 }
923 
924 static void
925 redraw_tab(struct tab *tab)
926 {
927 	if (too_small)
928 		return;
929 
930 	if (side_window & SIDE_WINDOW_LEFT) {
931 		redraw_help();
932 		wnoutrefresh(help);
933 	}
934 
935 	if (side_window & SIDE_WINDOW_BOTTOM) {
936 		redraw_download();
937 		wnoutrefresh(download);
938 	}
939 
940 	if (show_tab_bar)
941 		redraw_tabline();
942 
943 	redraw_body(tab);
944 	redraw_modeline(tab);
945 	redraw_minibuffer();
946 
947 	wnoutrefresh(tabline);
948 	wnoutrefresh(modeline);
949 
950 	if (in_minibuffer == MB_COMPREAD)
951 		wnoutrefresh(minibuffer);
952 
953 	place_cursor(1);
954 
955 	doupdate();
956 
957 	if (set_title)
958 		dprintf(1, "\033]2;%s - Telescope\a",
959 		    current_tab->buffer.page.title);
960 }
961 
962 void
963 start_loading_anim(struct tab *tab)
964 {
965 	if (tab->loading_anim)
966 		return;
967 	tab->loading_anim = 1;
968 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
969 	evtimer_add(&tab->loadingev, &loadingev_timer);
970 }
971 
972 static void
973 update_loading_anim(int fd, short ev, void *d)
974 {
975 	struct tab	*tab = d;
976 
977 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
978 
979 	if (tab == current_tab) {
980 		redraw_modeline(tab);
981 		wrefresh(modeline);
982 		wrefresh(body);
983 		if (in_minibuffer)
984 			wrefresh(echoarea);
985 	}
986 
987 	evtimer_add(&tab->loadingev, &loadingev_timer);
988 }
989 
990 static void
991 stop_loading_anim(struct tab *tab)
992 {
993 	if (!tab->loading_anim)
994 		return;
995 	evtimer_del(&tab->loadingev);
996 	tab->loading_anim = 0;
997 	tab->loading_anim_step = 0;
998 
999 	if (tab != current_tab)
1000 		return;
1001 
1002 	redraw_modeline(tab);
1003 
1004 	wrefresh(modeline);
1005 	wrefresh(body);
1006 	if (in_minibuffer)
1007 		wrefresh(echoarea);
1008 }
1009 
1010 int
1011 ui_print_colors(void)
1012 {
1013 	int colors = 0, pairs = 0, can_change = 0;
1014 	int columns = 16, lines, color, i, j;
1015 
1016 	initscr();
1017 	if (has_colors()) {
1018 		start_color();
1019 		use_default_colors();
1020 
1021 		colors = COLORS;
1022 		pairs = COLOR_PAIRS;
1023 		can_change = can_change_color();
1024 	}
1025 	endwin();
1026 
1027 	printf("Term info:\n");
1028 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1029 	    getenv("TERM"), colors, pairs, can_change);
1030 	printf("\n");
1031 
1032 	if (colors == 0) {
1033 		printf("No color support\n");
1034 		return 0;
1035 	}
1036 
1037 	printf("Available colors:\n\n");
1038 	lines = (colors - 1) / columns + 1;
1039 	color = 0;
1040 	for (i = 0; i < lines; ++i) {
1041 		for (j = 0; j < columns; ++j, ++color) {
1042 			printf("\033[0;38;5;%dm %03d", color, color);
1043 		}
1044 		printf("\n");
1045 	}
1046 
1047 	printf("\033[0m");
1048 	fflush(stdout);
1049 	return 0;
1050 }
1051 
1052 int
1053 ui_init()
1054 {
1055 	setlocale(LC_ALL, "");
1056 
1057 	if (TAILQ_EMPTY(&global_map.m)) {
1058 		fprintf(stderr, "no keys defined!\n");
1059 		return 0;
1060 	}
1061 
1062 	minibuffer_init();
1063 
1064 	/* initialize download window */
1065 	TAILQ_INIT(&downloadwin.head);
1066 	TAILQ_INIT(&downloadwin.page.head);
1067 
1068 	/* initialize help window */
1069 	TAILQ_INIT(&helpwin.head);
1070 	TAILQ_INIT(&helpwin.page.head);
1071 
1072 	base_map = &global_map;
1073 	current_map = &global_map;
1074 
1075 	initscr();
1076 
1077 	if (enable_colors) {
1078 		if (has_colors()) {
1079 			start_color();
1080 			use_default_colors();
1081 		} else
1082 			enable_colors = 0;
1083 	}
1084 
1085 	config_apply_style();
1086 
1087 	raw();
1088 	noecho();
1089 	nonl();
1090 	intrflush(stdscr, FALSE);
1091 
1092 	if ((tabline = newwin(1, 1, 0, 0)) == NULL)
1093 		return 0;
1094 	if ((body = newwin(1, 1, 0, 0)) == NULL)
1095 		return 0;
1096 	if ((modeline = newwin(1, 1, 0, 0)) == NULL)
1097 		return 0;
1098 	if ((echoarea = newwin(1, 1, 0, 0)) == NULL)
1099 		return 0;
1100 	if ((minibuffer = newwin(1, 1, 0, 0)) == NULL)
1101 		return 0;
1102 	if ((download = newwin(1, 1, 0, 0)) == NULL)
1103 		return 0;
1104 	if ((help = newwin(1, 1, 0, 0)) == NULL)
1105 		return 0;
1106 
1107 	wbkgd(body, body_face.body);
1108 	wbkgd(download, download_face.background);
1109 	wbkgd(echoarea, minibuffer_face.background);
1110 
1111 	update_x_offset();
1112 
1113 	keypad(body, TRUE);
1114 	scrollok(body, FALSE);
1115 
1116 	/* non-blocking input */
1117 	wtimeout(body, 0);
1118 	wtimeout(help, 0);
1119 
1120 	mvwprintw(body, 0, 0, "");
1121 
1122 	evtimer_set(&resizeev, handle_resize, NULL);
1123 
1124 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1125 	event_add(&stdioev, NULL);
1126 
1127 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1128 	signal_add(&winchev, NULL);
1129 
1130 	return 1;
1131 }
1132 
1133 void
1134 ui_main_loop(void)
1135 {
1136 	switch_to_tab(current_tab);
1137 	rearrange_windows();
1138 
1139 	event_dispatch();
1140 }
1141 
1142 void
1143 ui_on_tab_loaded(struct tab *tab)
1144 {
1145 	stop_loading_anim(tab);
1146 	message("Loaded %s", tab->hist_cur->h);
1147 
1148 	if (show_tab_bar)
1149 		redraw_tabline();
1150 
1151 	wrefresh(tabline);
1152 	place_cursor(0);
1153 }
1154 
1155 void
1156 ui_on_tab_refresh(struct tab *tab)
1157 {
1158 	wrap_page(&tab->buffer, body_cols);
1159 	if (tab == current_tab)
1160 		redraw_tab(tab);
1161 	else
1162 		tab->flags |= TAB_URGENT;
1163 }
1164 
1165 void
1166 ui_on_download_refresh(void)
1167 {
1168 	if (side_window & SIDE_WINDOW_BOTTOM) {
1169                 recompute_downloads();
1170 		redraw_tab(current_tab);
1171 	}
1172 }
1173 
1174 const char *
1175 ui_keyname(int k)
1176 {
1177 	return keyname(k);
1178 }
1179 
1180 void
1181 ui_toggle_side_window(int kind)
1182 {
1183 	if (in_side_window & kind)
1184 		ui_other_window();
1185 
1186 	side_window ^= kind;
1187 	if (side_window & SIDE_WINDOW_LEFT)
1188 		recompute_help();
1189 	if (side_window & SIDE_WINDOW_BOTTOM)
1190 		recompute_downloads();
1191 
1192 	/*
1193 	 * ugly hack, but otherwise the window doesn't get updated
1194 	 * until I call rearrange_windows a second time (e.g. via
1195 	 * C-l).  I will be happy to know why something like this is
1196 	 * needed.
1197 	 */
1198 	rearrange_windows();
1199 	rearrange_windows();
1200 }
1201 
1202 void
1203 ui_show_downloads_pane(void)
1204 {
1205 	if (!(side_window & SIDE_WINDOW_BOTTOM))
1206 		ui_toggle_side_window(SIDE_WINDOW_BOTTOM);
1207 }
1208 
1209 void
1210 ui_schedule_redraw(void)
1211 {
1212 	should_rearrange_windows = 1;
1213 }
1214 
1215 void
1216 ui_require_input(struct tab *tab, int hide, int proto)
1217 {
1218 	void (*fn)(void);
1219 
1220 	if (proto == PROTO_GEMINI)
1221 		fn = ir_select_gemini;
1222 	else if (proto == PROTO_GOPHER)
1223 		fn = ir_select_gopher;
1224 	else
1225 		abort();
1226 
1227 	/* TODO: hard-switching to another tab is ugly */
1228 	switch_to_tab(tab);
1229 
1230 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1231 	    &ir_history, NULL, NULL);
1232 	strlcpy(ministate.prompt, "Input required: ",
1233 	    sizeof(ministate.prompt));
1234 	redraw_tab(tab);
1235 }
1236 
1237 void
1238 ui_after_message_hook(void)
1239 {
1240 	redraw_minibuffer();
1241 	place_cursor(0);
1242 }
1243 
1244 void
1245 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1246     struct tab *data)
1247 {
1248 	yornp(prompt, fn, data);
1249 	redraw_tab(current_tab);
1250 }
1251 
1252 void
1253 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1254     struct tab *data, const char *input)
1255 {
1256 	minibuffer_read(prompt, fn, data);
1257 
1258 	if (input != NULL) {
1259 		strlcpy(ministate.buf, input, sizeof(ministate.buf));
1260 		cmd_move_end_of_line(&ministate.buffer);
1261 	}
1262 
1263 	redraw_tab(current_tab);
1264 }
1265 
1266 void
1267 ui_other_window(void)
1268 {
1269 	if (in_side_window & SIDE_WINDOW_LEFT &&
1270 	    side_window & SIDE_WINDOW_BOTTOM)
1271 		in_side_window = SIDE_WINDOW_BOTTOM;
1272 	else if (in_side_window)
1273 		in_side_window = 0;
1274 	else if (!in_side_window && side_window & SIDE_WINDOW_LEFT)
1275 		in_side_window = SIDE_WINDOW_LEFT;
1276 	else if (!in_side_window && side_window)
1277 		in_side_window = SIDE_WINDOW_BOTTOM;
1278 	else
1279 		message("No other window to select");
1280 }
1281 
1282 void
1283 ui_suspend(void)
1284 {
1285 	endwin();
1286 
1287 	kill(getpid(), SIGSTOP);
1288 
1289 	refresh();
1290 	clear();
1291 	rearrange_windows();
1292 }
1293 
1294 void
1295 ui_end(void)
1296 {
1297 	endwin();
1298 }