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Date:: Mon Jan 10 15:15:27 2022 UTC
Message:: add fringe prefix and allow to override offset for fringes alone
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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, 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 int			 download_cols;
102 
103 static int		 side_window;
104 static int		 in_side_window;
105 
106 static struct timeval	loadingev_timer = { 0, 250000 };
107 
108 static char	keybuf[64];
109 
110 /* XXX: don't forget to init these in main() */
111 struct kmap global_map,
112 	minibuffer_map,
113 	*current_map,
114 	*base_map;
115 
116 static inline void
117 update_x_offset(void)
118 {
119 	if (olivetti_mode && fill_column < body_cols)
120 		x_offset = (body_cols - fill_column)/2;
121 	else
122 		x_offset = 0;
123 }
124 
125 void
126 save_excursion(struct excursion *place, struct buffer *buffer)
127 {
128 	place->curs_x = buffer->curs_x;
129 	place->curs_y = buffer->curs_y;
130 	place->line_off = buffer->line_off;
131 	place->top_line = buffer->top_line;
132 	place->current_line = buffer->current_line;
133 	place->cpoff = buffer->cpoff;
134 }
135 
136 void
137 restore_excursion(struct excursion *place, struct buffer *buffer)
138 {
139 	buffer->curs_x = place->curs_x;
140 	buffer->curs_y = place->curs_y;
141 	buffer->line_off = place->line_off;
142 	buffer->top_line = place->top_line;
143 	buffer->current_line = place->current_line;
144 	buffer->cpoff = place->cpoff;
145 }
146 
147 static void
148 restore_curs_x(struct buffer *buffer)
149 {
150 	struct vline	*vl;
151 	const char	*prfx, *text;
152 
153 	vl = buffer->current_line;
154 	if (vl == NULL || vl->line == NULL)
155 		buffer->curs_x = buffer->cpoff = 0;
156 	else if (vl->parent->data != NULL) {
157 		text = vl->parent->data;
158 		buffer->curs_x = utf8_snwidth(text + 1, buffer->cpoff) + 1;
159 	} else
160 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
161 
162 	/* small hack: don't olivetti-mode the download pane */
163 	if (buffer != &downloadwin)
164 		buffer->curs_x += x_offset;
165 
166 	if (vl == NULL)
167 		return;
168 
169 	if (vl->parent->data != NULL)
170 		buffer->curs_x += utf8_swidth_between(vl->parent->line,
171 		    vl->parent->data);
172 	else {
173 		prfx = line_prefixes[vl->parent->type].prfx1;
174 		buffer->curs_x += utf8_swidth(prfx);
175 	}
176 }
177 
178 void
179 global_key_unbound(void)
180 {
181 	message("%s is undefined", keybuf);
182 }
183 
184 struct buffer *
185 current_buffer(void)
186 {
187 	if (in_minibuffer)
188 		return &ministate.buffer;
189 	if (in_side_window & SIDE_WINDOW_LEFT)
190 		return &helpwin;
191 	if (in_side_window & SIDE_WINDOW_BOTTOM)
192 		return &downloadwin;
193 	return &current_tab->buffer;
194 }
195 
196 static int
197 readkey(void)
198 {
199 	uint32_t state = 0;
200 
201 	if ((thiskey.key = wgetch(body)) == ERR)
202 		return 0;
203 
204 	thiskey.meta = thiskey.key == '\e';
205 	if (thiskey.meta) {
206 		thiskey.key = wgetch(body);
207 		if (thiskey.key == ERR || thiskey.key == '\e') {
208 			thiskey.meta = 0;
209 			thiskey.key = '\e';
210 		}
211 	}
212 
213 	thiskey.cp = 0;
214 
215 	if ((unsigned int)thiskey.key >= UINT8_MAX)
216 		return 1;
217 
218 	while (1) {
219 		if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
220 			break;
221 		if ((thiskey.key = wgetch(body)) == ERR) {
222 			message("Error decoding user input");
223 			return 0;
224 		}
225 	}
226 
227 	return 1;
228 }
229 
230 static void
231 dispatch_stdio(int fd, short ev, void *d)
232 {
233 	int		 lk;
234 	const char	*keyname;
235 	char		 tmp[5] = {0};
236 
237 	/* TODO: schedule a redraw? */
238 	if (too_small)
239 		return;
240 
241 	if (!readkey())
242 		return;
243 
244 	if (keybuf[0] != '\0')
245 		strlcat(keybuf, " ", sizeof(keybuf));
246 	if (thiskey.meta)
247 		strlcat(keybuf, "M-", sizeof(keybuf));
248 	if (thiskey.cp != 0) {
249 		utf8_encode(thiskey.cp, tmp);
250 		strlcat(keybuf, tmp, sizeof(keybuf));
251 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
252 		strlcat(keybuf, keyname, sizeof(keybuf));
253 	} else {
254 		tmp[0] = thiskey.key;
255 		strlcat(keybuf, tmp, sizeof(keybuf));
256 	}
257 
258 	lk = lookup_key(&current_map, &thiskey, current_buffer());
259 	if (lk == LK_UNBOUND) {
260 		if (current_map->unhandled_input != NULL)
261 			current_map->unhandled_input();
262 		else
263 			global_key_unbound();
264 	}
265 	if (lk != LK_ADVANCED_MAP) {
266 		current_map = base_map;
267 		strlcpy(keybuf, "", sizeof(keybuf));
268 	}
269 
270 	if (side_window & SIDE_WINDOW_LEFT)
271 		recompute_help();
272 
273 	if (should_rearrange_windows)
274 		rearrange_windows();
275 	redraw_tab(current_tab);
276 }
277 
278 static void
279 handle_resize(int sig, short ev, void *d)
280 {
281 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
282 		event_del(&resizeev);
283 	}
284 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
285 	evtimer_add(&resizeev, &resize_timer);
286 }
287 
288 static void
289 handle_resize_nodelay(int s, short ev, void *d)
290 {
291 	endwin();
292 	refresh();
293 	clear();
294 
295 	rearrange_windows();
296 }
297 
298 static inline int
299 should_show_tab_bar(void)
300 {
301 	if (tab_bar_show == -1)
302 		return 0;
303 	if (tab_bar_show == 0)
304 		return 1;
305 
306 	return TAILQ_NEXT(TAILQ_FIRST(&tabshead), tabs) != NULL;
307 }
308 
309 static void
310 rearrange_windows(void)
311 {
312 	int		 lines;
313 	int		 minibuffer_lines;
314 
315 	should_rearrange_windows = 0;
316 	show_tab_bar = should_show_tab_bar();
317 
318 	lines = LINES;
319 
320 	/* 3 lines for the ui and 12 for the  */
321 	if ((too_small = lines < 15)) {
322 		erase();
323 		printw("Window too small.");
324 		refresh();
325 		return;
326 	}
327 
328 	/* move and resize the windows, in reverse order! */
329 
330 	if (in_minibuffer == MB_COMPREAD) {
331 		minibuffer_lines = MIN(10, lines/2);
332 		mvwin(minibuffer, lines - minibuffer_lines, 0);
333 		wresize(minibuffer, minibuffer_lines, COLS);
334 		lines -= minibuffer_lines;
335 
336 		wrap_page(&ministate.compl.buffer, COLS);
337 	}
338 
339 	mvwin(echoarea, --lines, 0);
340 	wresize(echoarea, 1, COLS);
341 
342 	mvwin(modeline, --lines, 0);
343 	wresize(modeline, 1, COLS);
344 
345 	if (side_window & SIDE_WINDOW_BOTTOM) {
346 		download_lines = MIN(5, lines/2);
347 		download_cols = COLS;
348 		mvwin(download, lines - download_lines, 0);
349 		wresize(download, download_lines, download_cols);
350 		lines -= download_lines;
351 
352 		wrap_page(&downloadwin, download_cols);
353 	}
354 
355 	body_lines = show_tab_bar ? --lines : lines;
356 	body_cols = COLS;
357 
358 	/*
359 	 * Here we make the assumption that show_tab_bar is either 0
360 	 * or 1, and reuse that as argument to mvwin.
361 	 */
362 	if (side_window & SIDE_WINDOW_LEFT) {
363 		help_cols = 0.3 * COLS;
364 		help_lines = lines;
365 		mvwin(help, show_tab_bar, 0);
366 		wresize(help, help_lines, help_cols);
367 
368 		wrap_page(&helpwin, help_cols);
369 
370 		body_cols = COLS - help_cols - 1;
371 		mvwin(body, show_tab_bar, help_cols);
372 	} else
373 		mvwin(body, show_tab_bar, 0);
374 
375 	update_x_offset();
376 	wresize(body, body_lines, body_cols);
377 
378 	if (show_tab_bar)
379 		wresize(tabline, 1, COLS);
380 
381 	wrap_page(&current_tab->buffer, body_cols);
382 	redraw_tab(current_tab);
383 }
384 
385 static void
386 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
387     const char **prfx_ret, const char **text_ret)
388 {
389 	int type, i, cont, width;
390 	char *space, *t;
391 
392 	if ((*text_ret = vl->line) == NULL)
393 		*text_ret = "";
394 
395 	cont = vl->flags & L_CONTINUATION;
396 	type = vl->parent->type;
397 	if (!cont)
398 		*prfx_ret = line_prefixes[type].prfx1;
399 	else
400 		*prfx_ret = line_prefixes[type].prfx2;
401 
402 	space = vl->parent->data;
403 	if (!emojify_link || type != LINE_LINK || space == NULL)
404 		return;
405 
406 	if (cont) {
407 		memset(buf, 0, len);
408 		width = utf8_swidth_between(vl->parent->line, space);
409 		for (i = 0; i < width + 1; ++i)
410 			strlcat(buf, " ", len);
411 	} else {
412 		strlcpy(buf, *text_ret, len);
413 		if ((t = strchr(buf, ' ')) != NULL)
414 			*t = '\0';
415 		strlcat(buf, " ", len);
416 
417 		/* skip the emoji */
418 		*text_ret += (space - vl->parent->line) + 1;
419 	}
420 
421 	*prfx_ret = buf;
422 }
423 
424 static inline void
425 print_vline_descr(int width, WINDOW *window, struct vline *vl)
426 {
427 	int x, y, goal;
428 
429 	switch (vl->parent->type) {
430 	case LINE_COMPL:
431 	case LINE_COMPL_CURRENT:
432 		goal = width/2;
433 		break;
434 	case LINE_DOWNLOAD:
435 	case LINE_DOWNLOAD_DONE:
436 		goal = width/4;
437 		break;
438 	case LINE_HELP:
439 		goal = 8;
440 		break;
441 	default:
442 		return;
443 	}
444 
445 	if (vl->parent->alt == NULL)
446 		return;
447 
448 	(void)y;
449 	getyx(window, y, x);
450 
451 	if (goal <= x)
452 		wprintw(window, " ");
453 	for (; goal > x; ++x)
454 		wprintw(window, " ");
455 
456 	wprintw(window, "%s", vl->parent->alt);
457 }
458 
459 /*
460  * Core part of the rendering.  It prints a vline starting from the
461  * current cursor position.  Printing a vline consists of skipping
462  * `off' columns (for olivetti-mode), print the correct prefix (which
463  * may be the emoji in case of emojified links-lines), printing the
464  * text itself, filling until width - off and filling off columns
465  * again.
466  */
467 static void
468 print_vline(int off, int width, WINDOW *window, struct vline *vl)
469 {
470 	/*
471 	 * Believe me or not, I've seen emoji ten code points long!
472 	 * That means, to stay large, 4*10 bytes + NUL.
473 	 */
474 	char emojibuf[41] = {0};
475 	const char *text, *prfx;
476 	struct line_face *f;
477 	int i, left, x, y;
478 
479 	f = &line_faces[vl->parent->type];
480 
481 	/* unused, set by getyx */
482 	(void)y;
483 
484 	if (vl->parent->type == LINE_FRINGE && fringe_ignore_offset)
485 		off = 0;
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     int show_fringe, struct buffer *buffer)
646 {
647 	struct vline	*vl;
648 	int		 onscreen = 0, l = 0;
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 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
677 		if (vl->parent->flags & L_HIDDEN)
678 			continue;
679 
680 		wmove(win, l, 0);
681 		print_vline(off, width, win, vl);
682 
683 		if (vl == buffer->current_line)
684 			onscreen = 1;
685 
686 		if (!onscreen)
687 			buffer->curs_y++;
688 
689 		l++;
690 		if (l == height)
691 			break;
692 	}
693 
694 	if (!onscreen) {
695 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
696 			if (vl == buffer->current_line)
697 				break;
698 			if (vl->parent->flags & L_HIDDEN)
699 				continue;
700 			buffer->line_off++;
701 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
702 		}
703 
704 		if (vl != NULL)
705 			goto again;
706 	}
707 
708 	buffer->last_line_off = buffer->line_off;
709 	buffer->force_redraw = 0;
710 end:
711 	for (; show_fringe && l < height; l++)
712 		print_vline(off, width, win, &fringe);
713 
714 	wmove(win, buffer->curs_y, buffer->curs_x);
715 }
716 
717 static void
718 redraw_download(void)
719 {
720 	redraw_window(download, 0, download_lines, COLS, 0, &downloadwin);
721 }
722 
723 static void
724 redraw_help(void)
725 {
726 	redraw_window(help, 0, help_lines, help_cols, 1, &helpwin);
727 }
728 
729 static void
730 redraw_body(struct tab *tab)
731 {
732 	static struct tab *last_tab;
733 
734 	if (last_tab != tab)
735 		tab->buffer.force_redraw =1;
736 	last_tab = tab;
737 
738 	redraw_window(body, x_offset, body_lines, body_cols, 1, &tab->buffer);
739 }
740 
741 static inline char
742 trust_status_char(enum trust_state ts)
743 {
744 	switch (ts) {
745 	case TS_UNKNOWN:	return '-';
746 	case TS_UNTRUSTED:	return '!';
747 	case TS_TEMP_TRUSTED:	return '!';
748 	case TS_TRUSTED:	return 'v';
749 	case TS_VERIFIED:	return 'V';
750 	default:		return 'X';
751 	}
752 }
753 
754 static void
755 redraw_modeline(struct tab *tab)
756 {
757 	struct buffer	*buffer;
758 	double		 pct;
759 	int		 x, y, max_x, max_y;
760 	const char	*mode;
761 	const char	*spin = "-\\|/";
762 
763 	buffer = current_buffer();
764 	mode = buffer->page.name;
765 
766 	werase(modeline);
767 	wattr_on(modeline, modeline_face.background, NULL);
768 	wmove(modeline, 0, 0);
769 
770 	wprintw(modeline, "-%c%c- %s ",
771 	    spin[tab->loading_anim_step],
772 	    trust_status_char(tab->trust),
773 	    mode == NULL ? "(none)" : mode);
774 
775 	pct = (buffer->line_off + buffer->curs_y) * 100.0
776 		/ buffer->line_max;
777 
778 	if (buffer->line_max <= (size_t)body_lines)
779 		wprintw(modeline, "All ");
780 	else if (buffer->line_off == 0)
781 		wprintw(modeline, "Top ");
782 	else if (buffer->line_off + body_lines >= buffer->line_max)
783 		wprintw(modeline, "Bottom ");
784 	else
785 		wprintw(modeline, "%.0f%% ", pct);
786 
787 	wprintw(modeline, "%d/%d %s ",
788 	    buffer->line_off + buffer->curs_y,
789 	    buffer->line_max,
790 	    tab->hist_cur->h);
791 
792 	getyx(modeline, y, x);
793 	getmaxyx(modeline, max_y, max_x);
794 
795 	(void)y;
796 	(void)max_y;
797 
798 	for (; x < max_x; ++x)
799 		waddstr(modeline, "-");
800 
801 	wattr_off(modeline, modeline_face.background, NULL);
802 }
803 
804 static void
805 redraw_minibuffer(void)
806 {
807 	wattr_on(echoarea, minibuffer_face.background, NULL);
808 	werase(echoarea);
809 
810 	if (in_minibuffer)
811 		do_redraw_minibuffer();
812 	else
813 		do_redraw_echoarea();
814 
815 	if (in_minibuffer == MB_COMPREAD)
816 		do_redraw_minibuffer_compl();
817 
818 	wattr_off(echoarea, minibuffer_face.background, NULL);
819 }
820 
821 static void
822 do_redraw_echoarea(void)
823 {
824 	struct vline *vl;
825 
826 	if (ministate.curmesg != NULL)
827 		wprintw(echoarea, "%s", ministate.curmesg);
828 	else if (*keybuf != '\0')
829 		waddstr(echoarea, keybuf);
830 	else {
831 		/* If nothing else, show the URL at point */
832 		vl = current_tab->buffer.current_line;
833 		if (vl != NULL && vl->parent->type == LINE_LINK)
834 			waddstr(echoarea, vl->parent->alt);
835 	}
836 }
837 
838 static void
839 do_redraw_minibuffer(void)
840 {
841 	struct buffer	*cmplbuf, *buffer;
842 	size_t		 off_y, off_x = 0;
843 	const char	*start, *c;
844 
845 	cmplbuf = &ministate.compl.buffer;
846 	buffer = &ministate.buffer;
847 	(void)off_y;		/* unused, set by getyx */
848 
849 	wmove(echoarea, 0, 0);
850 
851 	if (in_minibuffer == MB_COMPREAD)
852 		wprintw(echoarea, "(%2d) ",
853 		    cmplbuf->line_max);
854 
855 	wprintw(echoarea, "%s", ministate.prompt);
856 	if (ministate.hist_cur != NULL)
857 		wprintw(echoarea, "(%zu/%zu) ",
858 		    ministate.hist_off + 1,
859 		    ministate.history->len);
860 
861 	getyx(echoarea, off_y, off_x);
862 
863 	start = ministate.hist_cur != NULL
864 		? ministate.hist_cur->h
865 		: ministate.buf;
866 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
867 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
868 		start = utf8_next_cp(start);
869 	}
870 
871 	waddstr(echoarea, start);
872 
873 	if (ministate.curmesg != NULL)
874 		wprintw(echoarea, " [%s]", ministate.curmesg);
875 
876 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
877 }
878 
879 static void
880 do_redraw_minibuffer_compl(void)
881 {
882 	redraw_window(minibuffer, 0, 10, COLS, 1,
883 	    &ministate.compl.buffer);
884 }
885 
886 /*
887  * Place the cursor in the right ncurses window.  If soft is 1, use
888  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
889  * wrefresh.
890  */
891 static void
892 place_cursor(int soft)
893 {
894 	int (*touch)(WINDOW *);
895 
896 	if (soft)
897 		touch = wnoutrefresh;
898 	else
899 		touch = wrefresh;
900 
901 	if (in_minibuffer) {
902 		if (side_window & SIDE_WINDOW_LEFT)
903 			touch(help);
904 		if (side_window & SIDE_WINDOW_BOTTOM)
905 			touch(download);
906 		touch(body);
907 		touch(echoarea);
908 	} else if (in_side_window & SIDE_WINDOW_LEFT) {
909 		touch(body);
910 		touch(echoarea);
911                 if (in_side_window & SIDE_WINDOW_BOTTOM)
912 			touch(download);
913 		touch(help);
914 	} else if (in_side_window & SIDE_WINDOW_BOTTOM) {
915 		touch(body);
916 		touch(echoarea);
917 		if (in_side_window & SIDE_WINDOW_LEFT)
918 			touch(help);
919 		touch(download);
920 	} else {
921 		if (side_window & SIDE_WINDOW_LEFT)
922 			touch(help);
923 		if (side_window & SIDE_WINDOW_BOTTOM)
924 			touch(download);
925 		touch(echoarea);
926 		touch(body);
927 	}
928 }
929 
930 static void
931 redraw_tab(struct tab *tab)
932 {
933 	if (too_small)
934 		return;
935 
936 	if (side_window & SIDE_WINDOW_LEFT) {
937 		redraw_help();
938 		wnoutrefresh(help);
939 	}
940 
941 	if (side_window & SIDE_WINDOW_BOTTOM) {
942 		redraw_download();
943 		wnoutrefresh(download);
944 	}
945 
946 	if (show_tab_bar)
947 		redraw_tabline();
948 
949 	redraw_body(tab);
950 	redraw_modeline(tab);
951 	redraw_minibuffer();
952 
953 	wnoutrefresh(tabline);
954 	wnoutrefresh(modeline);
955 
956 	if (in_minibuffer == MB_COMPREAD)
957 		wnoutrefresh(minibuffer);
958 
959 	place_cursor(1);
960 
961 	doupdate();
962 
963 	if (set_title)
964 		dprintf(1, "\033]2;%s - Telescope\a",
965 		    current_tab->buffer.page.title);
966 }
967 
968 void
969 start_loading_anim(struct tab *tab)
970 {
971 	if (tab->loading_anim)
972 		return;
973 	tab->loading_anim = 1;
974 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
975 	evtimer_add(&tab->loadingev, &loadingev_timer);
976 }
977 
978 static void
979 update_loading_anim(int fd, short ev, void *d)
980 {
981 	struct tab	*tab = d;
982 
983 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
984 
985 	if (tab == current_tab) {
986 		redraw_modeline(tab);
987 		wrefresh(modeline);
988 		wrefresh(body);
989 		if (in_minibuffer)
990 			wrefresh(echoarea);
991 	}
992 
993 	evtimer_add(&tab->loadingev, &loadingev_timer);
994 }
995 
996 static void
997 stop_loading_anim(struct tab *tab)
998 {
999 	if (!tab->loading_anim)
1000 		return;
1001 	evtimer_del(&tab->loadingev);
1002 	tab->loading_anim = 0;
1003 	tab->loading_anim_step = 0;
1004 
1005 	if (tab != current_tab)
1006 		return;
1007 
1008 	redraw_modeline(tab);
1009 
1010 	wrefresh(modeline);
1011 	wrefresh(body);
1012 	if (in_minibuffer)
1013 		wrefresh(echoarea);
1014 }
1015 
1016 int
1017 ui_print_colors(void)
1018 {
1019 	int colors = 0, pairs = 0, can_change = 0;
1020 	int columns = 16, lines, color, i, j;
1021 
1022 	initscr();
1023 	if (has_colors()) {
1024 		start_color();
1025 		use_default_colors();
1026 
1027 		colors = COLORS;
1028 		pairs = COLOR_PAIRS;
1029 		can_change = can_change_color();
1030 	}
1031 	endwin();
1032 
1033 	printf("Term info:\n");
1034 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1035 	    getenv("TERM"), colors, pairs, can_change);
1036 	printf("\n");
1037 
1038 	if (colors == 0) {
1039 		printf("No color support\n");
1040 		return 0;
1041 	}
1042 
1043 	printf("Available colors:\n\n");
1044 	lines = (colors - 1) / columns + 1;
1045 	color = 0;
1046 	for (i = 0; i < lines; ++i) {
1047 		for (j = 0; j < columns; ++j, ++color) {
1048 			printf("\033[0;38;5;%dm %03d", color, color);
1049 		}
1050 		printf("\n");
1051 	}
1052 
1053 	printf("\033[0m");
1054 	fflush(stdout);
1055 	return 0;
1056 }
1057 
1058 int
1059 ui_init()
1060 {
1061 	setlocale(LC_ALL, "");
1062 
1063 	if (TAILQ_EMPTY(&global_map.m)) {
1064 		fprintf(stderr, "no keys defined!\n");
1065 		return 0;
1066 	}
1067 
1068 	minibuffer_init();
1069 
1070 	/* initialize download window */
1071 	TAILQ_INIT(&downloadwin.head);
1072 	TAILQ_INIT(&downloadwin.page.head);
1073 
1074 	/* initialize help window */
1075 	TAILQ_INIT(&helpwin.head);
1076 	TAILQ_INIT(&helpwin.page.head);
1077 
1078 	base_map = &global_map;
1079 	current_map = &global_map;
1080 
1081 	initscr();
1082 
1083 	if (enable_colors) {
1084 		if (has_colors()) {
1085 			start_color();
1086 			use_default_colors();
1087 		} else
1088 			enable_colors = 0;
1089 	}
1090 
1091 	config_apply_style();
1092 
1093 	raw();
1094 	noecho();
1095 	nonl();
1096 	intrflush(stdscr, FALSE);
1097 
1098 	if ((tabline = newwin(1, 1, 0, 0)) == NULL)
1099 		return 0;
1100 	if ((body = newwin(1, 1, 0, 0)) == NULL)
1101 		return 0;
1102 	if ((modeline = newwin(1, 1, 0, 0)) == NULL)
1103 		return 0;
1104 	if ((echoarea = newwin(1, 1, 0, 0)) == NULL)
1105 		return 0;
1106 	if ((minibuffer = newwin(1, 1, 0, 0)) == NULL)
1107 		return 0;
1108 	if ((download = newwin(1, 1, 0, 0)) == NULL)
1109 		return 0;
1110 	if ((help = newwin(1, 1, 0, 0)) == NULL)
1111 		return 0;
1112 
1113 	wbkgd(body, body_face.body);
1114 	wbkgd(download, download_face.background);
1115 	wbkgd(echoarea, minibuffer_face.background);
1116 
1117 	update_x_offset();
1118 
1119 	keypad(body, TRUE);
1120 	scrollok(body, FALSE);
1121 
1122 	/* non-blocking input */
1123 	wtimeout(body, 0);
1124 	wtimeout(help, 0);
1125 
1126 	mvwprintw(body, 0, 0, "");
1127 
1128 	return 1;
1129 }
1130 
1131 void
1132 ui_main_loop(void)
1133 {
1134 	evtimer_set(&resizeev, handle_resize, NULL);
1135 
1136 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1137 	event_add(&stdioev, NULL);
1138 
1139 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1140 	signal_add(&winchev, NULL);
1141 
1142 	switch_to_tab(current_tab);
1143 	rearrange_windows();
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 void
1170 ui_on_download_refresh(void)
1171 {
1172 	if (side_window & SIDE_WINDOW_BOTTOM) {
1173 		recompute_downloads();
1174 		redraw_tab(current_tab);
1175 	}
1176 }
1177 
1178 const char *
1179 ui_keyname(int k)
1180 {
1181 	return keyname(k);
1182 }
1183 
1184 void
1185 ui_toggle_side_window(int kind)
1186 {
1187 	if (in_side_window & kind)
1188 		ui_other_window();
1189 
1190 	side_window ^= kind;
1191 	if (side_window & SIDE_WINDOW_LEFT)
1192 		recompute_help();
1193 	if (side_window & SIDE_WINDOW_BOTTOM)
1194 		recompute_downloads();
1195 
1196 	/*
1197 	 * ugly hack, but otherwise the window doesn't get updated
1198 	 * until I call rearrange_windows a second time (e.g. via
1199 	 * C-l).  I will be happy to know why something like this is
1200 	 * needed.
1201 	 */
1202 	rearrange_windows();
1203 	rearrange_windows();
1204 }
1205 
1206 void
1207 ui_show_downloads_pane(void)
1208 {
1209 	if (!(side_window & SIDE_WINDOW_BOTTOM))
1210 		ui_toggle_side_window(SIDE_WINDOW_BOTTOM);
1211 }
1212 
1213 void
1214 ui_schedule_redraw(void)
1215 {
1216 	should_rearrange_windows = 1;
1217 }
1218 
1219 void
1220 ui_require_input(struct tab *tab, int hide, int proto)
1221 {
1222 	void (*fn)(void);
1223 
1224 	if (proto == PROTO_GEMINI)
1225 		fn = ir_select_gemini;
1226 	else if (proto == PROTO_GOPHER)
1227 		fn = ir_select_gopher;
1228 	else
1229 		abort();
1230 
1231 	/* TODO: hard-switching to another tab is ugly */
1232 	switch_to_tab(tab);
1233 
1234 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1235 	    &ir_history, NULL, NULL);
1236 	strlcpy(ministate.prompt, "Input required: ",
1237 	    sizeof(ministate.prompt));
1238 	redraw_tab(tab);
1239 }
1240 
1241 void
1242 ui_after_message_hook(void)
1243 {
1244 	redraw_minibuffer();
1245 	place_cursor(0);
1246 }
1247 
1248 void
1249 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1250     struct tab *data)
1251 {
1252 	yornp(prompt, fn, data);
1253 	redraw_tab(current_tab);
1254 }
1255 
1256 void
1257 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1258     struct tab *data, const char *input)
1259 {
1260 	minibuffer_read(prompt, fn, data);
1261 
1262 	if (input != NULL) {
1263 		strlcpy(ministate.buf, input, sizeof(ministate.buf));
1264 		cmd_move_end_of_line(&ministate.buffer);
1265 	}
1266 
1267 	redraw_tab(current_tab);
1268 }
1269 
1270 void
1271 ui_other_window(void)
1272 {
1273 	if (in_side_window & SIDE_WINDOW_LEFT &&
1274 	    side_window & SIDE_WINDOW_BOTTOM)
1275 		in_side_window = SIDE_WINDOW_BOTTOM;
1276 	else if (in_side_window)
1277 		in_side_window = 0;
1278 	else if (!in_side_window && side_window & SIDE_WINDOW_LEFT)
1279 		in_side_window = SIDE_WINDOW_LEFT;
1280 	else if (!in_side_window && side_window)
1281 		in_side_window = SIDE_WINDOW_BOTTOM;
1282 	else
1283 		message("No other window to select");
1284 }
1285 
1286 void
1287 ui_suspend(void)
1288 {
1289 	endwin();
1290 
1291 	kill(getpid(), SIGSTOP);
1292 
1293 	refresh();
1294 	clear();
1295 	rearrange_windows();
1296 }
1297 
1298 void
1299 ui_end(void)
1300 {
1301 	endwin();
1302 }