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Date:: Fri Nov 5 13:59:10 2021 UTC
Message:: add side window for downloads
Actions:: History | Blame | Raw File
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 	struct keymap	*k;
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 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
258 		if (k->meta == thiskey.meta &&
259 		    k->key == thiskey.key) {
260 			if (k->fn == NULL)
261 				current_map = &k->map;
262 			else {
263 				current_map = base_map;
264 				strlcpy(keybuf, "", sizeof(keybuf));
265 				k->fn(current_buffer());
266 			}
267 			goto done;
268 		}
269 	}
270 
271 	if (current_map->unhandled_input != NULL)
272 		current_map->unhandled_input();
273 	else
274 		global_key_unbound();
275 
276 	strlcpy(keybuf, "", sizeof(keybuf));
277 	current_map = base_map;
278 
279 done:
280 	if (side_window & SIDE_WINDOW_LEFT)
281 		recompute_help();
282 
283 	if (should_rearrange_windows)
284 		rearrange_windows();
285 	redraw_tab(current_tab);
286 }
287 
288 static void
289 handle_resize(int sig, short ev, void *d)
290 {
291 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
292 		event_del(&resizeev);
293 	}
294 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
295 	evtimer_add(&resizeev, &resize_timer);
296 }
297 
298 static void
299 handle_resize_nodelay(int s, short ev, void *d)
300 {
301 	endwin();
302 	refresh();
303 	clear();
304 
305 	rearrange_windows();
306 }
307 
308 static inline int
309 should_show_tab_bar(void)
310 {
311 	if (tab_bar_show == -1)
312 		return 0;
313 	if (tab_bar_show == 0)
314 		return 1;
315 
316 	return TAILQ_NEXT(TAILQ_FIRST(&tabshead), tabs) != NULL;
317 }
318 
319 static void
320 rearrange_windows(void)
321 {
322 	int		 lines;
323 	int		 minibuffer_lines;
324 
325 	should_rearrange_windows = 0;
326 	show_tab_bar = should_show_tab_bar();
327 
328 	lines = LINES;
329 
330 	/* 3 lines for the ui and 12 for the  */
331 	if ((too_small = lines < 15)) {
332 		erase();
333 		printw("Window too small.");
334 		refresh();
335 		return;
336 	}
337 
338 	/* move and resize the windows, in reverse order! */
339 
340 	if (in_minibuffer == MB_COMPREAD) {
341 		minibuffer_lines = MIN(10, lines/2);
342 		mvwin(minibuffer, lines - minibuffer_lines, 0);
343 		wresize(minibuffer, minibuffer_lines, COLS);
344 		lines -= minibuffer_lines;
345 
346 		wrap_page(&ministate.compl.buffer, COLS);
347 	}
348 
349 	mvwin(echoarea, --lines, 0);
350 	wresize(echoarea, 1, COLS);
351 
352 	mvwin(modeline, --lines, 0);
353 	wresize(modeline, 1, COLS);
354 
355 	if (side_window & SIDE_WINDOW_BOTTOM) {
356 		download_lines = MIN(5, lines/2);
357 		mvwin(download, lines - download_lines, 0);
358 		wresize(download, download_lines, COLS);
359 		lines -= download_lines;
360 
361 		wrap_page(&downloadwin, COLS);
362 	}
363 
364 	body_lines = show_tab_bar ? --lines : lines;
365 	body_cols = COLS;
366 
367 	/*
368 	 * Here we make the assumption that show_tab_bar is either 0
369 	 * or 1, and reuse that as argument to mvwin.
370 	 */
371 	if (side_window & SIDE_WINDOW_LEFT) {
372 		help_cols = 0.3 * COLS;
373 		help_lines = lines;
374 		mvwin(help, show_tab_bar, 0);
375 		wresize(help, help_lines, help_cols);
376 
377 		wrap_page(&helpwin, help_cols);
378 
379 		body_cols = COLS - help_cols - 1;
380 		mvwin(body, show_tab_bar, help_cols);
381 	} else
382 		mvwin(body, show_tab_bar, 0);
383 
384 	update_x_offset();
385 	wresize(body, body_lines, body_cols);
386 
387 	if (show_tab_bar)
388 		wresize(tabline, 1, COLS);
389 
390 	wrap_page(&current_tab->buffer, body_cols);
391 	redraw_tab(current_tab);
392 }
393 
394 static void
395 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
396     const char **prfx_ret, const char **text_ret)
397 {
398 	int type, i, cont, width;
399 	char *space, *t;
400 
401 	if ((*text_ret = vl->line) == NULL)
402 		*text_ret = "";
403 
404 	cont = vl->flags & L_CONTINUATION;
405 	type = vl->parent->type;
406 	if (!cont)
407 		*prfx_ret = line_prefixes[type].prfx1;
408 	else
409 		*prfx_ret = line_prefixes[type].prfx2;
410 
411 	space = vl->parent->data;
412 	if (!emojify_link || type != LINE_LINK || space == NULL)
413 		return;
414 
415 	if (cont) {
416 		memset(buf, 0, len);
417 		width = utf8_swidth_between(vl->parent->line, space);
418 		for (i = 0; i < width + 1; ++i)
419 			strlcat(buf, " ", len);
420 	} else {
421 		strlcpy(buf, *text_ret, len);
422 		if ((t = strchr(buf, ' ')) != NULL)
423 			*t = '\0';
424 		strlcat(buf, " ", len);
425 
426 		/* skip the emoji */
427 		*text_ret += (space - vl->parent->line) + 1;
428 	}
429 
430 	*prfx_ret = buf;
431 }
432 
433 static inline void
434 print_vline_descr(int width, WINDOW *window, struct vline *vl)
435 {
436 	int x, y, goal;
437 
438 	if (vl->parent->type != LINE_COMPL &&
439 	    vl->parent->type != LINE_COMPL_CURRENT &&
440 	    vl->parent->type != LINE_HELP)
441 		return;
442 
443 	if (vl->parent->alt == NULL)
444 		return;
445 
446 	(void)y;
447 	getyx(window, y, x);
448 
449 	if (vl->parent->type == LINE_HELP)
450 		goal = 8;
451 	else
452 		goal = width/2;
453 
454 	if (goal <= x)
455 		wprintw(window, " ");
456 	for (; goal > x; ++x)
457 		wprintw(window, " ");
458 
459 	wprintw(window, "%s", vl->parent->alt);
460 }
461 
462 /*
463  * Core part of the rendering.  It prints a vline starting from the
464  * current cursor position.  Printing a vline consists of skipping
465  * `off' columns (for olivetti-mode), print the correct prefix (which
466  * may be the emoji in case of emojified links-lines), printing the
467  * text itself, filling until width - off and filling off columns
468  * again.
469  */
470 static void
471 print_vline(int off, int width, WINDOW *window, struct vline *vl)
472 {
473 	/*
474 	 * Believe me or not, I've seen emoji ten code points long!
475 	 * That means, to stay large, 4*10 bytes + NUL.
476 	 */
477 	char emojibuf[41] = {0};
478 	const char *text, *prfx;
479 	struct line_face *f;
480 	int i, left, x, y;
481 
482 	f = &line_faces[vl->parent->type];
483 
484 	/* unused, set by getyx */
485 	(void)y;
486 
487 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
488 
489 	wattr_on(window, body_face.left, NULL);
490 	for (i = 0; i < off; i++)
491 		waddch(window, ' ');
492 	wattr_off(window, body_face.left, NULL);
493 
494 	wattr_on(window, f->prefix, NULL);
495 	wprintw(window, "%s", prfx);
496 	wattr_off(window, f->prefix, NULL);
497 
498 	wattr_on(window, f->text, NULL);
499 	wprintw(window, "%s", text);
500 	print_vline_descr(width, window, vl);
501 	wattr_off(window, f->text, NULL);
502 
503 	getyx(window, y, x);
504 
505 	left = width - x;
506 
507 	wattr_on(window, f->trail, NULL);
508 	for (i = 0; i < left - off; ++i)
509 		waddch(window, ' ');
510 	wattr_off(window, f->trail, NULL);
511 
512 	wattr_on(window, body_face.right, NULL);
513 	for (i = 0; i < off; i++)
514 		waddch(window, ' ');
515 	wattr_off(window, body_face.right, NULL);
516 
517 }
518 
519 static void
520 redraw_tabline(void)
521 {
522 	struct tab	*tab;
523 	size_t		 toskip, ots, tabwidth, space, x;
524 	int		 current, y, truncated, pair;
525 	const char	*title;
526 	char		 buf[25];
527 
528 	x = 0;
529 
530 	/* unused, but setted by a getyx */
531 	(void)y;
532 
533 	tabwidth = sizeof(buf)+1;
534 	space = COLS-2;
535 
536 	toskip = 0;
537 	TAILQ_FOREACH(tab, &tabshead, tabs) {
538 		toskip++;
539 		if (tab == current_tab)
540 			break;
541 	}
542 
543 	if (toskip * tabwidth < space)
544 		toskip = 0;
545 	else {
546 		ots = toskip;
547 		toskip--;
548 		while (toskip != 0 &&
549 		    (ots - toskip+1) * tabwidth < space)
550 			toskip--;
551 	}
552 
553 	werase(tabline);
554 	wattr_on(tabline, tab_face.background, NULL);
555 	wprintw(tabline, toskip == 0 ? " " : "<");
556 	wattr_off(tabline, tab_face.background, NULL);
557 
558 	truncated = 0;
559 	TAILQ_FOREACH(tab, &tabshead, tabs) {
560 		if (truncated)
561 			break;
562 		if (toskip != 0) {
563 			toskip--;
564 			continue;
565 		}
566 
567 		getyx(tabline, y, x);
568 		if (x + sizeof(buf)+2 >= (size_t)COLS)
569 			truncated = 1;
570 
571 		current = tab == current_tab;
572 
573 		if (*(title = tab->buffer.page.title) == '\0')
574 			title = tab->hist_cur->h;
575 
576 		if (tab->flags & TAB_URGENT)
577 			strlcpy(buf, "!", sizeof(buf));
578 		else
579 			strlcpy(buf, " ", sizeof(buf));
580 
581 		if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
582 			/* truncation happens */
583 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
584 		} else {
585 			/* pad with spaces */
586 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
587 				/* nop */ ;
588 		}
589 
590 		pair = current ? tab_face.current : tab_face.tab;
591 		wattr_on(tabline, pair, NULL);
592 		wprintw(tabline, "%s", buf);
593 		wattr_off(tabline, pair, NULL);
594 
595 		wattr_on(tabline, tab_face.background, NULL);
596 		if (TAILQ_NEXT(tab, tabs) != NULL)
597 			wprintw(tabline, "┃");
598 		wattr_off(tabline, tab_face.background, NULL);
599 	}
600 
601 	wattr_on(tabline, tab_face.background, NULL);
602 	for (; x < (size_t)COLS; ++x)
603 		waddch(tabline, ' ');
604 	if (truncated)
605 		mvwprintw(tabline, 0, COLS-1, ">");
606 	wattr_off(tabline, tab_face.background, NULL);
607 }
608 
609 /*
610  * Compute the first visible line around vl.  Try to search forward
611  * until the end of the buffer; if a visible line is not found, search
612  * backward.  Return NULL if no viable line was found.
613  */
614 struct vline *
615 adjust_line(struct vline *vl, struct buffer *buffer)
616 {
617 	struct vline *t;
618 
619 	if (vl == NULL)
620 		return NULL;
621 
622 	if (!(vl->parent->flags & L_HIDDEN))
623 		return vl;
624 
625 	/* search forward */
626 	for (t = vl;
627 	     t != NULL && t->parent->flags & L_HIDDEN;
628 	     t = TAILQ_NEXT(t, vlines))
629 		;		/* nop */
630 
631 	if (t != NULL)
632 		return t;
633 
634 	/* search backward */
635 	for (t = vl;
636 	     t != NULL && t->parent->flags & L_HIDDEN;
637 	     t = TAILQ_PREV(t, vhead, vlines))
638 		;		/* nop */
639 
640 	return t;
641 }
642 
643 static void
644 redraw_window(WINDOW *win, int off, int height, int width,
645     struct buffer *buffer)
646 {
647 	struct vline	*vl;
648 	int		 l, onscreen;
649 
650 	restore_curs_x(buffer);
651 
652 	/*
653 	 * TODO: ignoring buffer->force_update and always
654 	 * re-rendering.  In theory we can recompute the y position
655 	 * without a re-render, and optimize here.  It's not the only
656 	 * optimisation possible here, wscrl wolud also be an
657 	 * interesting one.
658 	 */
659 
660 again:
661 	werase(win);
662 	buffer->curs_y = 0;
663 
664 	if (TAILQ_EMPTY(&buffer->head))
665 		goto end;
666 
667 	if (buffer->top_line == NULL)
668 		buffer->top_line = TAILQ_FIRST(&buffer->head);
669 
670 	buffer->top_line = adjust_line(buffer->top_line, buffer);
671 	if (buffer->top_line == NULL)
672 		goto end;
673 
674 	buffer->current_line = adjust_line(buffer->current_line, buffer);
675 
676 	l = 0;
677 	onscreen = 0;
678 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
679 		if (vl->parent->flags & L_HIDDEN)
680 			continue;
681 
682 		wmove(win, l, 0);
683 		print_vline(off, width, win, vl);
684 
685 		if (vl == buffer->current_line)
686 			onscreen = 1;
687 
688 		if (!onscreen)
689 			buffer->curs_y++;
690 
691 		l++;
692 		if (l == height)
693 			break;
694 	}
695 
696 	if (!onscreen) {
697 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
698 			if (vl == buffer->current_line)
699 				break;
700 			if (vl->parent->flags & L_HIDDEN)
701 				continue;
702 			buffer->line_off++;
703 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
704 		}
705 
706 		if (vl != NULL)
707 			goto again;
708 	}
709 
710 	buffer->last_line_off = buffer->line_off;
711 	buffer->force_redraw = 0;
712 end:
713 	wmove(win, buffer->curs_y, buffer->curs_x);
714 }
715 
716 static void
717 redraw_download(void)
718 {
719 	redraw_window(download, 0, download_lines, COLS, &downloadwin);
720 }
721 
722 static void
723 redraw_help(void)
724 {
725 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
726 }
727 
728 static void
729 redraw_body(struct tab *tab)
730 {
731 	static struct tab *last_tab;
732 
733 	if (last_tab != tab)
734 		tab->buffer.force_redraw =1;
735 	last_tab = tab;
736 
737 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
738 }
739 
740 static inline char
741 trust_status_char(enum trust_state ts)
742 {
743 	switch (ts) {
744 	case TS_UNKNOWN:	return '-';
745 	case TS_UNTRUSTED:	return '!';
746 	case TS_TEMP_TRUSTED:	return '!';
747 	case TS_TRUSTED:	return 'v';
748 	case TS_VERIFIED:	return 'V';
749 	default:		return 'X';
750 	}
751 }
752 
753 static void
754 redraw_modeline(struct tab *tab)
755 {
756 	struct buffer	*buffer;
757 	double		 pct;
758 	int		 x, y, max_x, max_y;
759 	const char	*mode;
760 	const char	*spin = "-\\|/";
761 
762 	buffer = current_buffer();
763 	mode = buffer->page.name;
764 
765 	werase(modeline);
766 	wattr_on(modeline, modeline_face.background, NULL);
767 	wmove(modeline, 0, 0);
768 
769 	wprintw(modeline, "-%c%c %s ",
770 	    spin[tab->loading_anim_step],
771 	    trust_status_char(tab->trust),
772 	    mode == NULL ? "(none)" : mode);
773 
774 	pct = (buffer->line_off + buffer->curs_y) * 100.0
775 		/ buffer->line_max;
776 
777 	if (buffer->line_max <= (size_t)body_lines)
778 		wprintw(modeline, "All ");
779 	else if (buffer->line_off == 0)
780 		wprintw(modeline, "Top ");
781 	else if (buffer->line_off + body_lines >= buffer->line_max)
782 		wprintw(modeline, "Bottom ");
783 	else
784 		wprintw(modeline, "%.0f%% ", pct);
785 
786 	wprintw(modeline, "%d/%d %s ",
787 	    buffer->line_off + buffer->curs_y,
788 	    buffer->line_max,
789 	    tab->hist_cur->h);
790 
791 	getyx(modeline, y, x);
792 	getmaxyx(modeline, max_y, max_x);
793 
794 	(void)y;
795 	(void)max_y;
796 
797 	for (; x < max_x; ++x)
798 		waddstr(modeline, "-");
799 
800 	wattr_off(modeline, modeline_face.background, NULL);
801 }
802 
803 static void
804 redraw_minibuffer(void)
805 {
806 	wattr_on(echoarea, minibuffer_face.background, NULL);
807 	werase(echoarea);
808 
809 	if (in_minibuffer)
810 		do_redraw_minibuffer();
811 	else
812 		do_redraw_echoarea();
813 
814 	if (in_minibuffer == MB_COMPREAD)
815 		do_redraw_minibuffer_compl();
816 
817 	wattr_off(echoarea, minibuffer_face.background, NULL);
818 }
819 
820 static void
821 do_redraw_echoarea(void)
822 {
823 	struct vline *vl;
824 
825 	if (ministate.curmesg != NULL)
826 		wprintw(echoarea, "%s", ministate.curmesg);
827 	else if (*keybuf != '\0')
828 		waddstr(echoarea, keybuf);
829 	else {
830 		/* If nothing else, show the URL at point */
831 		vl = current_tab->buffer.current_line;
832 		if (vl != NULL && vl->parent->type == LINE_LINK)
833 			waddstr(echoarea, vl->parent->alt);
834 	}
835 }
836 
837 static void
838 do_redraw_minibuffer(void)
839 {
840 	struct buffer	*cmplbuf, *buffer;
841 	size_t		 off_y, off_x = 0;
842 	const char	*start, *c;
843 
844 	cmplbuf = &ministate.compl.buffer;
845 	buffer = &ministate.buffer;
846 	(void)off_y;		/* unused, set by getyx */
847 
848 	wmove(echoarea, 0, 0);
849 
850 	if (in_minibuffer == MB_COMPREAD)
851 		wprintw(echoarea, "(%2d) ",
852 		    cmplbuf->line_max);
853 
854 	wprintw(echoarea, "%s", ministate.prompt);
855 	if (ministate.hist_cur != NULL)
856 		wprintw(echoarea, "(%zu/%zu) ",
857 		    ministate.hist_off + 1,
858 		    ministate.history->len);
859 
860 	getyx(echoarea, off_y, off_x);
861 
862 	start = ministate.hist_cur != NULL
863 		? ministate.hist_cur->h
864 		: ministate.buf;
865 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
866 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
867 		start = utf8_next_cp(start);
868 	}
869 
870 	waddstr(echoarea, start);
871 
872 	if (ministate.curmesg != NULL)
873 		wprintw(echoarea, " [%s]", ministate.curmesg);
874 
875 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
876 }
877 
878 static void
879 do_redraw_minibuffer_compl(void)
880 {
881 	redraw_window(minibuffer, 0, 10, COLS,
882 	    &ministate.compl.buffer);
883 }
884 
885 /*
886  * Place the cursor in the right ncurses window.  If soft is 1, use
887  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
888  * wrefresh.
889  */
890 static void
891 place_cursor(int soft)
892 {
893 	int (*touch)(WINDOW *);
894 
895 	if (soft)
896 		touch = wnoutrefresh;
897 	else
898 		touch = wrefresh;
899 
900 	if (in_minibuffer) {
901 		if (side_window & SIDE_WINDOW_LEFT)
902 			touch(help);
903 		if (side_window & SIDE_WINDOW_BOTTOM)
904 			touch(download);
905 		touch(body);
906 		touch(echoarea);
907 	} else if (in_side_window & SIDE_WINDOW_LEFT) {
908 		touch(body);
909 		touch(echoarea);
910                 if (in_side_window & SIDE_WINDOW_BOTTOM)
911 			touch(download);
912 		touch(help);
913 	} else if (in_side_window & SIDE_WINDOW_BOTTOM) {
914 		touch(body);
915 		touch(echoarea);
916 		if (in_side_window & SIDE_WINDOW_LEFT)
917 			touch(help);
918 		touch(download);
919 	} else {
920 		if (side_window & SIDE_WINDOW_LEFT)
921 			touch(help);
922 		if (side_window & SIDE_WINDOW_BOTTOM)
923 			touch(download);
924 		touch(echoarea);
925 		touch(body);
926 	}
927 }
928 
929 static void
930 redraw_tab(struct tab *tab)
931 {
932 	if (too_small)
933 		return;
934 
935 	if (side_window & SIDE_WINDOW_LEFT) {
936 		redraw_help();
937 		wnoutrefresh(help);
938 	}
939 
940 	if (side_window & SIDE_WINDOW_BOTTOM) {
941 		redraw_download();
942 		wnoutrefresh(download);
943 	}
944 
945 	if (show_tab_bar)
946 		redraw_tabline();
947 
948 	redraw_body(tab);
949 	redraw_modeline(tab);
950 	redraw_minibuffer();
951 
952 	wnoutrefresh(tabline);
953 	wnoutrefresh(modeline);
954 
955 	if (in_minibuffer == MB_COMPREAD)
956 		wnoutrefresh(minibuffer);
957 
958 	place_cursor(1);
959 
960 	doupdate();
961 
962 	if (set_title)
963 		dprintf(1, "\033]2;%s - Telescope\a",
964 		    current_tab->buffer.page.title);
965 }
966 
967 void
968 start_loading_anim(struct tab *tab)
969 {
970 	if (tab->loading_anim)
971 		return;
972 	tab->loading_anim = 1;
973 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
974 	evtimer_add(&tab->loadingev, &loadingev_timer);
975 }
976 
977 static void
978 update_loading_anim(int fd, short ev, void *d)
979 {
980 	struct tab	*tab = d;
981 
982 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
983 
984 	if (tab == current_tab) {
985 		redraw_modeline(tab);
986 		wrefresh(modeline);
987 		wrefresh(body);
988 		if (in_minibuffer)
989 			wrefresh(echoarea);
990 	}
991 
992 	evtimer_add(&tab->loadingev, &loadingev_timer);
993 }
994 
995 static void
996 stop_loading_anim(struct tab *tab)
997 {
998 	if (!tab->loading_anim)
999 		return;
1000 	evtimer_del(&tab->loadingev);
1001 	tab->loading_anim = 0;
1002 	tab->loading_anim_step = 0;
1003 
1004 	if (tab != current_tab)
1005 		return;
1006 
1007 	redraw_modeline(tab);
1008 
1009 	wrefresh(modeline);
1010 	wrefresh(body);
1011 	if (in_minibuffer)
1012 		wrefresh(echoarea);
1013 }
1014 
1015 int
1016 ui_print_colors(void)
1017 {
1018 	int colors = 0, pairs = 0, can_change = 0;
1019 	int columns = 16, lines, color, i, j;
1020 
1021 	initscr();
1022 	if (has_colors()) {
1023 		start_color();
1024 		use_default_colors();
1025 
1026 		colors = COLORS;
1027 		pairs = COLOR_PAIRS;
1028 		can_change = can_change_color();
1029 	}
1030 	endwin();
1031 
1032 	printf("Term info:\n");
1033 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1034 	    getenv("TERM"), colors, pairs, can_change);
1035 	printf("\n");
1036 
1037 	if (colors == 0) {
1038 		printf("No color support\n");
1039 		return 0;
1040 	}
1041 
1042 	printf("Available colors:\n\n");
1043 	lines = (colors - 1) / columns + 1;
1044 	color = 0;
1045 	for (i = 0; i < lines; ++i) {
1046 		for (j = 0; j < columns; ++j, ++color) {
1047 			printf("\033[0;38;5;%dm %03d", color, color);
1048 		}
1049 		printf("\n");
1050 	}
1051 
1052 	printf("\033[0m");
1053 	fflush(stdout);
1054 	return 0;
1055 }
1056 
1057 int
1058 ui_init()
1059 {
1060 	setlocale(LC_ALL, "");
1061 
1062 	if (TAILQ_EMPTY(&global_map.m)) {
1063 		fprintf(stderr, "no keys defined!\n");
1064 		return 0;
1065 	}
1066 
1067 	minibuffer_init();
1068 
1069 	/* initialize download window */
1070 	TAILQ_INIT(&downloadwin.head);
1071 	TAILQ_INIT(&downloadwin.page.head);
1072 
1073 	/* initialize help window */
1074 	TAILQ_INIT(&helpwin.head);
1075 	TAILQ_INIT(&helpwin.page.head);
1076 
1077 	base_map = &global_map;
1078 	current_map = &global_map;
1079 
1080 	initscr();
1081 
1082 	if (enable_colors) {
1083 		if (has_colors()) {
1084 			start_color();
1085 			use_default_colors();
1086 		} else
1087 			enable_colors = 0;
1088 	}
1089 
1090 	config_apply_style();
1091 
1092 	raw();
1093 	noecho();
1094 	nonl();
1095 	intrflush(stdscr, FALSE);
1096 
1097 	if ((tabline = newwin(1, 1, 0, 0)) == NULL)
1098 		return 0;
1099 	if ((body = newwin(1, 1, 0, 0)) == NULL)
1100 		return 0;
1101 	if ((modeline = newwin(1, 1, 0, 0)) == NULL)
1102 		return 0;
1103 	if ((echoarea = newwin(1, 1, 0, 0)) == NULL)
1104 		return 0;
1105 	if ((minibuffer = newwin(1, 1, 0, 0)) == NULL)
1106 		return 0;
1107 	if ((download = newwin(1, 1, 0, 0)) == NULL)
1108 		return 0;
1109 	if ((help = newwin(1, 1, 0, 0)) == NULL)
1110 		return 0;
1111 
1112 	wbkgd(body, body_face.body);
1113 	wbkgd(echoarea, minibuffer_face.background);
1114 
1115 	update_x_offset();
1116 
1117 	keypad(body, TRUE);
1118 	scrollok(body, FALSE);
1119 
1120 	/* non-blocking input */
1121 	wtimeout(body, 0);
1122 	wtimeout(help, 0);
1123 
1124 	mvwprintw(body, 0, 0, "");
1125 
1126 	evtimer_set(&resizeev, handle_resize, NULL);
1127 
1128 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1129 	event_add(&stdioev, NULL);
1130 
1131 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1132 	signal_add(&winchev, NULL);
1133 
1134 	return 1;
1135 }
1136 
1137 void
1138 ui_main_loop(void)
1139 {
1140 	switch_to_tab(current_tab);
1141 	rearrange_windows();
1142 
1143 	event_dispatch();
1144 }
1145 
1146 void
1147 ui_on_tab_loaded(struct tab *tab)
1148 {
1149 	stop_loading_anim(tab);
1150 	message("Loaded %s", tab->hist_cur->h);
1151 
1152 	if (show_tab_bar)
1153 		redraw_tabline();
1154 
1155 	wrefresh(tabline);
1156 	place_cursor(0);
1157 }
1158 
1159 void
1160 ui_on_tab_refresh(struct tab *tab)
1161 {
1162 	wrap_page(&tab->buffer, body_cols);
1163 	if (tab == current_tab)
1164 		redraw_tab(tab);
1165 	else
1166 		tab->flags |= TAB_URGENT;
1167 }
1168 
1169 const char *
1170 ui_keyname(int k)
1171 {
1172 	return keyname(k);
1173 }
1174 
1175 void
1176 ui_toggle_side_window(int kind)
1177 {
1178 	if (in_side_window & kind)
1179 		ui_other_window();
1180 
1181 	side_window ^= kind;
1182 	if (side_window & SIDE_WINDOW_LEFT)
1183 		recompute_help();
1184 	if (side_window & SIDE_WINDOW_BOTTOM)
1185 		recompute_downloads();
1186 
1187 	/*
1188 	 * ugly hack, but otherwise the window doesn't get updated
1189 	 * until I call rearrange_windows a second time (e.g. via
1190 	 * C-l).  I will be happy to know why something like this is
1191 	 * needed.
1192 	 */
1193 	rearrange_windows();
1194 	rearrange_windows();
1195 }
1196 
1197 void
1198 ui_schedule_redraw(void)
1199 {
1200 	should_rearrange_windows = 1;
1201 }
1202 
1203 void
1204 ui_require_input(struct tab *tab, int hide, int proto)
1205 {
1206 	void (*fn)(void);
1207 
1208 	if (proto == PROTO_GEMINI)
1209 		fn = ir_select_gemini;
1210 	else if (proto == PROTO_GOPHER)
1211 		fn = ir_select_gopher;
1212 	else
1213 		abort();
1214 
1215 	/* TODO: hard-switching to another tab is ugly */
1216 	switch_to_tab(tab);
1217 
1218 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1219 	    &ir_history, NULL, NULL);
1220 	strlcpy(ministate.prompt, "Input required: ",
1221 	    sizeof(ministate.prompt));
1222 	redraw_tab(tab);
1223 }
1224 
1225 void
1226 ui_after_message_hook(void)
1227 {
1228 	redraw_minibuffer();
1229 	place_cursor(0);
1230 }
1231 
1232 void
1233 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1234     struct tab *data)
1235 {
1236 	yornp(prompt, fn, data);
1237 	redraw_tab(current_tab);
1238 }
1239 
1240 void
1241 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1242     struct tab *data, const char *input)
1243 {
1244 	minibuffer_read(prompt, fn, data);
1245 
1246 	if (input != NULL) {
1247 		strlcpy(ministate.buf, input, sizeof(ministate.buf));
1248 		cmd_move_end_of_line(&ministate.buffer);
1249 	}
1250 
1251 	redraw_tab(current_tab);
1252 }
1253 
1254 void
1255 ui_other_window(void)
1256 {
1257 	if (in_side_window & SIDE_WINDOW_LEFT &&
1258 	    side_window & SIDE_WINDOW_BOTTOM)
1259 		in_side_window = SIDE_WINDOW_BOTTOM;
1260 	else if (in_side_window)
1261 		in_side_window = 0;
1262 	else if (!in_side_window && side_window & SIDE_WINDOW_LEFT)
1263 		in_side_window = SIDE_WINDOW_LEFT;
1264 	else if (!in_side_window && side_window)
1265 		in_side_window = SIDE_WINDOW_BOTTOM;
1266 	else
1267 		message("No other window to select");
1268 }
1269 
1270 void
1271 ui_suspend(void)
1272 {
1273 	endwin();
1274 
1275 	kill(getpid(), SIGSTOP);
1276 
1277 	refresh();
1278 	clear();
1279 	rearrange_windows();
1280 }
1281 
1282 void
1283 ui_end(void)
1284 {
1285 	endwin();
1286 }