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Date:: Fri Nov 5 15:09:40 2021 UTC
Message:: add download and download.* line styles
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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 	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 	    vl->parent->type != LINE_DOWNLOAD &&
442 	    vl->parent->type != LINE_DOWNLOAD_DONE &&
443 	    vl->parent->type != LINE_DOWNLOAD_INFO)
444 		return;
445 
446 	if (vl->parent->alt == NULL)
447 		return;
448 
449 	(void)y;
450 	getyx(window, y, x);
451 
452 	switch (vl->parent->type) {
453 	case LINE_HELP:
454 	case LINE_DOWNLOAD:
455 	case LINE_DOWNLOAD_DONE:
456 	case LINE_DOWNLOAD_INFO:
457 		goal = 8;
458 		break;
459 	default:
460 		goal = width/2;
461 	}
462 
463 	if (goal <= x)
464 		wprintw(window, " ");
465 	for (; goal > x; ++x)
466 		wprintw(window, " ");
467 
468 	wprintw(window, "%s", vl->parent->alt);
469 }
470 
471 /*
472  * Core part of the rendering.  It prints a vline starting from the
473  * current cursor position.  Printing a vline consists of skipping
474  * `off' columns (for olivetti-mode), print the correct prefix (which
475  * may be the emoji in case of emojified links-lines), printing the
476  * text itself, filling until width - off and filling off columns
477  * again.
478  */
479 static void
480 print_vline(int off, int width, WINDOW *window, struct vline *vl)
481 {
482 	/*
483 	 * Believe me or not, I've seen emoji ten code points long!
484 	 * That means, to stay large, 4*10 bytes + NUL.
485 	 */
486 	char emojibuf[41] = {0};
487 	const char *text, *prfx;
488 	struct line_face *f;
489 	int i, left, x, y;
490 
491 	f = &line_faces[vl->parent->type];
492 
493 	/* unused, set by getyx */
494 	(void)y;
495 
496 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
497 
498 	wattr_on(window, body_face.left, NULL);
499 	for (i = 0; i < off; i++)
500 		waddch(window, ' ');
501 	wattr_off(window, body_face.left, NULL);
502 
503 	wattr_on(window, f->prefix, NULL);
504 	wprintw(window, "%s", prfx);
505 	wattr_off(window, f->prefix, NULL);
506 
507 	wattr_on(window, f->text, NULL);
508 	wprintw(window, "%s", text);
509 	print_vline_descr(width, window, vl);
510 	wattr_off(window, f->text, NULL);
511 
512 	getyx(window, y, x);
513 
514 	left = width - x;
515 
516 	wattr_on(window, f->trail, NULL);
517 	for (i = 0; i < left - off; ++i)
518 		waddch(window, ' ');
519 	wattr_off(window, f->trail, NULL);
520 
521 	wattr_on(window, body_face.right, NULL);
522 	for (i = 0; i < off; i++)
523 		waddch(window, ' ');
524 	wattr_off(window, body_face.right, NULL);
525 
526 }
527 
528 static void
529 redraw_tabline(void)
530 {
531 	struct tab	*tab;
532 	size_t		 toskip, ots, tabwidth, space, x;
533 	int		 current, y, truncated, pair;
534 	const char	*title;
535 	char		 buf[25];
536 
537 	x = 0;
538 
539 	/* unused, but setted by a getyx */
540 	(void)y;
541 
542 	tabwidth = sizeof(buf)+1;
543 	space = COLS-2;
544 
545 	toskip = 0;
546 	TAILQ_FOREACH(tab, &tabshead, tabs) {
547 		toskip++;
548 		if (tab == current_tab)
549 			break;
550 	}
551 
552 	if (toskip * tabwidth < space)
553 		toskip = 0;
554 	else {
555 		ots = toskip;
556 		toskip--;
557 		while (toskip != 0 &&
558 		    (ots - toskip+1) * tabwidth < space)
559 			toskip--;
560 	}
561 
562 	werase(tabline);
563 	wattr_on(tabline, tab_face.background, NULL);
564 	wprintw(tabline, toskip == 0 ? " " : "<");
565 	wattr_off(tabline, tab_face.background, NULL);
566 
567 	truncated = 0;
568 	TAILQ_FOREACH(tab, &tabshead, tabs) {
569 		if (truncated)
570 			break;
571 		if (toskip != 0) {
572 			toskip--;
573 			continue;
574 		}
575 
576 		getyx(tabline, y, x);
577 		if (x + sizeof(buf)+2 >= (size_t)COLS)
578 			truncated = 1;
579 
580 		current = tab == current_tab;
581 
582 		if (*(title = tab->buffer.page.title) == '\0')
583 			title = tab->hist_cur->h;
584 
585 		if (tab->flags & TAB_URGENT)
586 			strlcpy(buf, "!", sizeof(buf));
587 		else
588 			strlcpy(buf, " ", sizeof(buf));
589 
590 		if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
591 			/* truncation happens */
592 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
593 		} else {
594 			/* pad with spaces */
595 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
596 				/* nop */ ;
597 		}
598 
599 		pair = current ? tab_face.current : tab_face.tab;
600 		wattr_on(tabline, pair, NULL);
601 		wprintw(tabline, "%s", buf);
602 		wattr_off(tabline, pair, NULL);
603 
604 		wattr_on(tabline, tab_face.background, NULL);
605 		if (TAILQ_NEXT(tab, tabs) != NULL)
606 			wprintw(tabline, "┃");
607 		wattr_off(tabline, tab_face.background, NULL);
608 	}
609 
610 	wattr_on(tabline, tab_face.background, NULL);
611 	for (; x < (size_t)COLS; ++x)
612 		waddch(tabline, ' ');
613 	if (truncated)
614 		mvwprintw(tabline, 0, COLS-1, ">");
615 	wattr_off(tabline, tab_face.background, NULL);
616 }
617 
618 /*
619  * Compute the first visible line around vl.  Try to search forward
620  * until the end of the buffer; if a visible line is not found, search
621  * backward.  Return NULL if no viable line was found.
622  */
623 struct vline *
624 adjust_line(struct vline *vl, struct buffer *buffer)
625 {
626 	struct vline *t;
627 
628 	if (vl == NULL)
629 		return NULL;
630 
631 	if (!(vl->parent->flags & L_HIDDEN))
632 		return vl;
633 
634 	/* search forward */
635 	for (t = vl;
636 	     t != NULL && t->parent->flags & L_HIDDEN;
637 	     t = TAILQ_NEXT(t, vlines))
638 		;		/* nop */
639 
640 	if (t != NULL)
641 		return t;
642 
643 	/* search backward */
644 	for (t = vl;
645 	     t != NULL && t->parent->flags & L_HIDDEN;
646 	     t = TAILQ_PREV(t, vhead, vlines))
647 		;		/* nop */
648 
649 	return t;
650 }
651 
652 static void
653 redraw_window(WINDOW *win, int off, int height, int width,
654     struct buffer *buffer)
655 {
656 	struct vline	*vl;
657 	int		 l, onscreen;
658 
659 	restore_curs_x(buffer);
660 
661 	/*
662 	 * TODO: ignoring buffer->force_update and always
663 	 * re-rendering.  In theory we can recompute the y position
664 	 * without a re-render, and optimize here.  It's not the only
665 	 * optimisation possible here, wscrl wolud also be an
666 	 * interesting one.
667 	 */
668 
669 again:
670 	werase(win);
671 	buffer->curs_y = 0;
672 
673 	if (TAILQ_EMPTY(&buffer->head))
674 		goto end;
675 
676 	if (buffer->top_line == NULL)
677 		buffer->top_line = TAILQ_FIRST(&buffer->head);
678 
679 	buffer->top_line = adjust_line(buffer->top_line, buffer);
680 	if (buffer->top_line == NULL)
681 		goto end;
682 
683 	buffer->current_line = adjust_line(buffer->current_line, buffer);
684 
685 	l = 0;
686 	onscreen = 0;
687 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
688 		if (vl->parent->flags & L_HIDDEN)
689 			continue;
690 
691 		wmove(win, l, 0);
692 		print_vline(off, width, win, vl);
693 
694 		if (vl == buffer->current_line)
695 			onscreen = 1;
696 
697 		if (!onscreen)
698 			buffer->curs_y++;
699 
700 		l++;
701 		if (l == height)
702 			break;
703 	}
704 
705 	if (!onscreen) {
706 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
707 			if (vl == buffer->current_line)
708 				break;
709 			if (vl->parent->flags & L_HIDDEN)
710 				continue;
711 			buffer->line_off++;
712 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
713 		}
714 
715 		if (vl != NULL)
716 			goto again;
717 	}
718 
719 	buffer->last_line_off = buffer->line_off;
720 	buffer->force_redraw = 0;
721 end:
722 	wmove(win, buffer->curs_y, buffer->curs_x);
723 }
724 
725 static void
726 redraw_download(void)
727 {
728 	redraw_window(download, 0, download_lines, COLS, &downloadwin);
729 }
730 
731 static void
732 redraw_help(void)
733 {
734 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
735 }
736 
737 static void
738 redraw_body(struct tab *tab)
739 {
740 	static struct tab *last_tab;
741 
742 	if (last_tab != tab)
743 		tab->buffer.force_redraw =1;
744 	last_tab = tab;
745 
746 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
747 }
748 
749 static inline char
750 trust_status_char(enum trust_state ts)
751 {
752 	switch (ts) {
753 	case TS_UNKNOWN:	return '-';
754 	case TS_UNTRUSTED:	return '!';
755 	case TS_TEMP_TRUSTED:	return '!';
756 	case TS_TRUSTED:	return 'v';
757 	case TS_VERIFIED:	return 'V';
758 	default:		return 'X';
759 	}
760 }
761 
762 static void
763 redraw_modeline(struct tab *tab)
764 {
765 	struct buffer	*buffer;
766 	double		 pct;
767 	int		 x, y, max_x, max_y;
768 	const char	*mode;
769 	const char	*spin = "-\\|/";
770 
771 	buffer = current_buffer();
772 	mode = buffer->page.name;
773 
774 	werase(modeline);
775 	wattr_on(modeline, modeline_face.background, NULL);
776 	wmove(modeline, 0, 0);
777 
778 	wprintw(modeline, "-%c%c %s ",
779 	    spin[tab->loading_anim_step],
780 	    trust_status_char(tab->trust),
781 	    mode == NULL ? "(none)" : mode);
782 
783 	pct = (buffer->line_off + buffer->curs_y) * 100.0
784 		/ buffer->line_max;
785 
786 	if (buffer->line_max <= (size_t)body_lines)
787 		wprintw(modeline, "All ");
788 	else if (buffer->line_off == 0)
789 		wprintw(modeline, "Top ");
790 	else if (buffer->line_off + body_lines >= buffer->line_max)
791 		wprintw(modeline, "Bottom ");
792 	else
793 		wprintw(modeline, "%.0f%% ", pct);
794 
795 	wprintw(modeline, "%d/%d %s ",
796 	    buffer->line_off + buffer->curs_y,
797 	    buffer->line_max,
798 	    tab->hist_cur->h);
799 
800 	getyx(modeline, y, x);
801 	getmaxyx(modeline, max_y, max_x);
802 
803 	(void)y;
804 	(void)max_y;
805 
806 	for (; x < max_x; ++x)
807 		waddstr(modeline, "-");
808 
809 	wattr_off(modeline, modeline_face.background, NULL);
810 }
811 
812 static void
813 redraw_minibuffer(void)
814 {
815 	wattr_on(echoarea, minibuffer_face.background, NULL);
816 	werase(echoarea);
817 
818 	if (in_minibuffer)
819 		do_redraw_minibuffer();
820 	else
821 		do_redraw_echoarea();
822 
823 	if (in_minibuffer == MB_COMPREAD)
824 		do_redraw_minibuffer_compl();
825 
826 	wattr_off(echoarea, minibuffer_face.background, NULL);
827 }
828 
829 static void
830 do_redraw_echoarea(void)
831 {
832 	struct vline *vl;
833 
834 	if (ministate.curmesg != NULL)
835 		wprintw(echoarea, "%s", ministate.curmesg);
836 	else if (*keybuf != '\0')
837 		waddstr(echoarea, keybuf);
838 	else {
839 		/* If nothing else, show the URL at point */
840 		vl = current_tab->buffer.current_line;
841 		if (vl != NULL && vl->parent->type == LINE_LINK)
842 			waddstr(echoarea, vl->parent->alt);
843 	}
844 }
845 
846 static void
847 do_redraw_minibuffer(void)
848 {
849 	struct buffer	*cmplbuf, *buffer;
850 	size_t		 off_y, off_x = 0;
851 	const char	*start, *c;
852 
853 	cmplbuf = &ministate.compl.buffer;
854 	buffer = &ministate.buffer;
855 	(void)off_y;		/* unused, set by getyx */
856 
857 	wmove(echoarea, 0, 0);
858 
859 	if (in_minibuffer == MB_COMPREAD)
860 		wprintw(echoarea, "(%2d) ",
861 		    cmplbuf->line_max);
862 
863 	wprintw(echoarea, "%s", ministate.prompt);
864 	if (ministate.hist_cur != NULL)
865 		wprintw(echoarea, "(%zu/%zu) ",
866 		    ministate.hist_off + 1,
867 		    ministate.history->len);
868 
869 	getyx(echoarea, off_y, off_x);
870 
871 	start = ministate.hist_cur != NULL
872 		? ministate.hist_cur->h
873 		: ministate.buf;
874 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
875 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
876 		start = utf8_next_cp(start);
877 	}
878 
879 	waddstr(echoarea, start);
880 
881 	if (ministate.curmesg != NULL)
882 		wprintw(echoarea, " [%s]", ministate.curmesg);
883 
884 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
885 }
886 
887 static void
888 do_redraw_minibuffer_compl(void)
889 {
890 	redraw_window(minibuffer, 0, 10, COLS,
891 	    &ministate.compl.buffer);
892 }
893 
894 /*
895  * Place the cursor in the right ncurses window.  If soft is 1, use
896  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
897  * wrefresh.
898  */
899 static void
900 place_cursor(int soft)
901 {
902 	int (*touch)(WINDOW *);
903 
904 	if (soft)
905 		touch = wnoutrefresh;
906 	else
907 		touch = wrefresh;
908 
909 	if (in_minibuffer) {
910 		if (side_window & SIDE_WINDOW_LEFT)
911 			touch(help);
912 		if (side_window & SIDE_WINDOW_BOTTOM)
913 			touch(download);
914 		touch(body);
915 		touch(echoarea);
916 	} else if (in_side_window & SIDE_WINDOW_LEFT) {
917 		touch(body);
918 		touch(echoarea);
919                 if (in_side_window & SIDE_WINDOW_BOTTOM)
920 			touch(download);
921 		touch(help);
922 	} else if (in_side_window & SIDE_WINDOW_BOTTOM) {
923 		touch(body);
924 		touch(echoarea);
925 		if (in_side_window & SIDE_WINDOW_LEFT)
926 			touch(help);
927 		touch(download);
928 	} else {
929 		if (side_window & SIDE_WINDOW_LEFT)
930 			touch(help);
931 		if (side_window & SIDE_WINDOW_BOTTOM)
932 			touch(download);
933 		touch(echoarea);
934 		touch(body);
935 	}
936 }
937 
938 static void
939 redraw_tab(struct tab *tab)
940 {
941 	if (too_small)
942 		return;
943 
944 	if (side_window & SIDE_WINDOW_LEFT) {
945 		redraw_help();
946 		wnoutrefresh(help);
947 	}
948 
949 	if (side_window & SIDE_WINDOW_BOTTOM) {
950 		redraw_download();
951 		wnoutrefresh(download);
952 	}
953 
954 	if (show_tab_bar)
955 		redraw_tabline();
956 
957 	redraw_body(tab);
958 	redraw_modeline(tab);
959 	redraw_minibuffer();
960 
961 	wnoutrefresh(tabline);
962 	wnoutrefresh(modeline);
963 
964 	if (in_minibuffer == MB_COMPREAD)
965 		wnoutrefresh(minibuffer);
966 
967 	place_cursor(1);
968 
969 	doupdate();
970 
971 	if (set_title)
972 		dprintf(1, "\033]2;%s - Telescope\a",
973 		    current_tab->buffer.page.title);
974 }
975 
976 void
977 start_loading_anim(struct tab *tab)
978 {
979 	if (tab->loading_anim)
980 		return;
981 	tab->loading_anim = 1;
982 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
983 	evtimer_add(&tab->loadingev, &loadingev_timer);
984 }
985 
986 static void
987 update_loading_anim(int fd, short ev, void *d)
988 {
989 	struct tab	*tab = d;
990 
991 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
992 
993 	if (tab == current_tab) {
994 		redraw_modeline(tab);
995 		wrefresh(modeline);
996 		wrefresh(body);
997 		if (in_minibuffer)
998 			wrefresh(echoarea);
999 	}
1000 
1001 	evtimer_add(&tab->loadingev, &loadingev_timer);
1002 }
1003 
1004 static void
1005 stop_loading_anim(struct tab *tab)
1006 {
1007 	if (!tab->loading_anim)
1008 		return;
1009 	evtimer_del(&tab->loadingev);
1010 	tab->loading_anim = 0;
1011 	tab->loading_anim_step = 0;
1012 
1013 	if (tab != current_tab)
1014 		return;
1015 
1016 	redraw_modeline(tab);
1017 
1018 	wrefresh(modeline);
1019 	wrefresh(body);
1020 	if (in_minibuffer)
1021 		wrefresh(echoarea);
1022 }
1023 
1024 int
1025 ui_print_colors(void)
1026 {
1027 	int colors = 0, pairs = 0, can_change = 0;
1028 	int columns = 16, lines, color, i, j;
1029 
1030 	initscr();
1031 	if (has_colors()) {
1032 		start_color();
1033 		use_default_colors();
1034 
1035 		colors = COLORS;
1036 		pairs = COLOR_PAIRS;
1037 		can_change = can_change_color();
1038 	}
1039 	endwin();
1040 
1041 	printf("Term info:\n");
1042 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1043 	    getenv("TERM"), colors, pairs, can_change);
1044 	printf("\n");
1045 
1046 	if (colors == 0) {
1047 		printf("No color support\n");
1048 		return 0;
1049 	}
1050 
1051 	printf("Available colors:\n\n");
1052 	lines = (colors - 1) / columns + 1;
1053 	color = 0;
1054 	for (i = 0; i < lines; ++i) {
1055 		for (j = 0; j < columns; ++j, ++color) {
1056 			printf("\033[0;38;5;%dm %03d", color, color);
1057 		}
1058 		printf("\n");
1059 	}
1060 
1061 	printf("\033[0m");
1062 	fflush(stdout);
1063 	return 0;
1064 }
1065 
1066 int
1067 ui_init()
1068 {
1069 	setlocale(LC_ALL, "");
1070 
1071 	if (TAILQ_EMPTY(&global_map.m)) {
1072 		fprintf(stderr, "no keys defined!\n");
1073 		return 0;
1074 	}
1075 
1076 	minibuffer_init();
1077 
1078 	/* initialize download window */
1079 	TAILQ_INIT(&downloadwin.head);
1080 	TAILQ_INIT(&downloadwin.page.head);
1081 
1082 	/* initialize help window */
1083 	TAILQ_INIT(&helpwin.head);
1084 	TAILQ_INIT(&helpwin.page.head);
1085 
1086 	base_map = &global_map;
1087 	current_map = &global_map;
1088 
1089 	initscr();
1090 
1091 	if (enable_colors) {
1092 		if (has_colors()) {
1093 			start_color();
1094 			use_default_colors();
1095 		} else
1096 			enable_colors = 0;
1097 	}
1098 
1099 	config_apply_style();
1100 
1101 	raw();
1102 	noecho();
1103 	nonl();
1104 	intrflush(stdscr, FALSE);
1105 
1106 	if ((tabline = newwin(1, 1, 0, 0)) == NULL)
1107 		return 0;
1108 	if ((body = newwin(1, 1, 0, 0)) == NULL)
1109 		return 0;
1110 	if ((modeline = newwin(1, 1, 0, 0)) == NULL)
1111 		return 0;
1112 	if ((echoarea = newwin(1, 1, 0, 0)) == NULL)
1113 		return 0;
1114 	if ((minibuffer = newwin(1, 1, 0, 0)) == NULL)
1115 		return 0;
1116 	if ((download = newwin(1, 1, 0, 0)) == NULL)
1117 		return 0;
1118 	if ((help = newwin(1, 1, 0, 0)) == NULL)
1119 		return 0;
1120 
1121 	wbkgd(body, body_face.body);
1122 	wbkgd(download, download_face.background);
1123 	wbkgd(echoarea, minibuffer_face.background);
1124 
1125 	update_x_offset();
1126 
1127 	keypad(body, TRUE);
1128 	scrollok(body, FALSE);
1129 
1130 	/* non-blocking input */
1131 	wtimeout(body, 0);
1132 	wtimeout(help, 0);
1133 
1134 	mvwprintw(body, 0, 0, "");
1135 
1136 	evtimer_set(&resizeev, handle_resize, NULL);
1137 
1138 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1139 	event_add(&stdioev, NULL);
1140 
1141 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1142 	signal_add(&winchev, NULL);
1143 
1144 	return 1;
1145 }
1146 
1147 void
1148 ui_main_loop(void)
1149 {
1150 	switch_to_tab(current_tab);
1151 	rearrange_windows();
1152 
1153 	event_dispatch();
1154 }
1155 
1156 void
1157 ui_on_tab_loaded(struct tab *tab)
1158 {
1159 	stop_loading_anim(tab);
1160 	message("Loaded %s", tab->hist_cur->h);
1161 
1162 	if (show_tab_bar)
1163 		redraw_tabline();
1164 
1165 	wrefresh(tabline);
1166 	place_cursor(0);
1167 }
1168 
1169 void
1170 ui_on_tab_refresh(struct tab *tab)
1171 {
1172 	wrap_page(&tab->buffer, body_cols);
1173 	if (tab == current_tab)
1174 		redraw_tab(tab);
1175 	else
1176 		tab->flags |= TAB_URGENT;
1177 }
1178 
1179 const char *
1180 ui_keyname(int k)
1181 {
1182 	return keyname(k);
1183 }
1184 
1185 void
1186 ui_toggle_side_window(int kind)
1187 {
1188 	if (in_side_window & kind)
1189 		ui_other_window();
1190 
1191 	side_window ^= kind;
1192 	if (side_window & SIDE_WINDOW_LEFT)
1193 		recompute_help();
1194 	if (side_window & SIDE_WINDOW_BOTTOM)
1195 		recompute_downloads();
1196 
1197 	/*
1198 	 * ugly hack, but otherwise the window doesn't get updated
1199 	 * until I call rearrange_windows a second time (e.g. via
1200 	 * C-l).  I will be happy to know why something like this is
1201 	 * needed.
1202 	 */
1203 	rearrange_windows();
1204 	rearrange_windows();
1205 }
1206 
1207 void
1208 ui_schedule_redraw(void)
1209 {
1210 	should_rearrange_windows = 1;
1211 }
1212 
1213 void
1214 ui_require_input(struct tab *tab, int hide, int proto)
1215 {
1216 	void (*fn)(void);
1217 
1218 	if (proto == PROTO_GEMINI)
1219 		fn = ir_select_gemini;
1220 	else if (proto == PROTO_GOPHER)
1221 		fn = ir_select_gopher;
1222 	else
1223 		abort();
1224 
1225 	/* TODO: hard-switching to another tab is ugly */
1226 	switch_to_tab(tab);
1227 
1228 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1229 	    &ir_history, NULL, NULL);
1230 	strlcpy(ministate.prompt, "Input required: ",
1231 	    sizeof(ministate.prompt));
1232 	redraw_tab(tab);
1233 }
1234 
1235 void
1236 ui_after_message_hook(void)
1237 {
1238 	redraw_minibuffer();
1239 	place_cursor(0);
1240 }
1241 
1242 void
1243 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1244     struct tab *data)
1245 {
1246 	yornp(prompt, fn, data);
1247 	redraw_tab(current_tab);
1248 }
1249 
1250 void
1251 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1252     struct tab *data, const char *input)
1253 {
1254 	minibuffer_read(prompt, fn, data);
1255 
1256 	if (input != NULL) {
1257 		strlcpy(ministate.buf, input, sizeof(ministate.buf));
1258 		cmd_move_end_of_line(&ministate.buffer);
1259 	}
1260 
1261 	redraw_tab(current_tab);
1262 }
1263 
1264 void
1265 ui_other_window(void)
1266 {
1267 	if (in_side_window & SIDE_WINDOW_LEFT &&
1268 	    side_window & SIDE_WINDOW_BOTTOM)
1269 		in_side_window = SIDE_WINDOW_BOTTOM;
1270 	else if (in_side_window)
1271 		in_side_window = 0;
1272 	else if (!in_side_window && side_window & SIDE_WINDOW_LEFT)
1273 		in_side_window = SIDE_WINDOW_LEFT;
1274 	else if (!in_side_window && side_window)
1275 		in_side_window = SIDE_WINDOW_BOTTOM;
1276 	else
1277 		message("No other window to select");
1278 }
1279 
1280 void
1281 ui_suspend(void)
1282 {
1283 	endwin();
1284 
1285 	kill(getpid(), SIGSTOP);
1286 
1287 	refresh();
1288 	clear();
1289 	rearrange_windows();
1290 }
1291 
1292 void
1293 ui_end(void)
1294 {
1295 	endwin();
1296 }