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Date:: Fri Nov 5 18:17:47 2021 UTC
Message:: change the goal for download lines
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 	switch (vl->parent->type) {
439 	case LINE_COMPL:
440 	case LINE_COMPL_CURRENT:
441 		goal = width/2;
442 		break;
443 	case LINE_DOWNLOAD:
444 	case LINE_DOWNLOAD_DONE:
445 	case LINE_DOWNLOAD_INFO:
446 		goal = width/4;
447 		break;
448 	case LINE_HELP:
449 		goal = 8;
450 		break;
451 	default:
452 		return;
453 	}
454 
455 	if (vl->parent->alt == NULL)
456 		return;
457 
458 	(void)y;
459 	getyx(window, y, x);
460 
461 	if (goal <= x)
462 		wprintw(window, " ");
463 	for (; goal > x; ++x)
464 		wprintw(window, " ");
465 
466 	wprintw(window, "%s", vl->parent->alt);
467 }
468 
469 /*
470  * Core part of the rendering.  It prints a vline starting from the
471  * current cursor position.  Printing a vline consists of skipping
472  * `off' columns (for olivetti-mode), print the correct prefix (which
473  * may be the emoji in case of emojified links-lines), printing the
474  * text itself, filling until width - off and filling off columns
475  * again.
476  */
477 static void
478 print_vline(int off, int width, WINDOW *window, struct vline *vl)
479 {
480 	/*
481 	 * Believe me or not, I've seen emoji ten code points long!
482 	 * That means, to stay large, 4*10 bytes + NUL.
483 	 */
484 	char emojibuf[41] = {0};
485 	const char *text, *prfx;
486 	struct line_face *f;
487 	int i, left, x, y;
488 
489 	f = &line_faces[vl->parent->type];
490 
491 	/* unused, set by getyx */
492 	(void)y;
493 
494 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
495 
496 	wattr_on(window, body_face.left, NULL);
497 	for (i = 0; i < off; i++)
498 		waddch(window, ' ');
499 	wattr_off(window, body_face.left, NULL);
500 
501 	wattr_on(window, f->prefix, NULL);
502 	wprintw(window, "%s", prfx);
503 	wattr_off(window, f->prefix, NULL);
504 
505 	wattr_on(window, f->text, NULL);
506 	wprintw(window, "%s", text);
507 	print_vline_descr(width, window, vl);
508 	wattr_off(window, f->text, NULL);
509 
510 	getyx(window, y, x);
511 
512 	left = width - x;
513 
514 	wattr_on(window, f->trail, NULL);
515 	for (i = 0; i < left - off; ++i)
516 		waddch(window, ' ');
517 	wattr_off(window, f->trail, NULL);
518 
519 	wattr_on(window, body_face.right, NULL);
520 	for (i = 0; i < off; i++)
521 		waddch(window, ' ');
522 	wattr_off(window, body_face.right, NULL);
523 
524 }
525 
526 static void
527 redraw_tabline(void)
528 {
529 	struct tab	*tab;
530 	size_t		 toskip, ots, tabwidth, space, x;
531 	int		 current, y, truncated, pair;
532 	const char	*title;
533 	char		 buf[25];
534 
535 	x = 0;
536 
537 	/* unused, but setted by a getyx */
538 	(void)y;
539 
540 	tabwidth = sizeof(buf)+1;
541 	space = COLS-2;
542 
543 	toskip = 0;
544 	TAILQ_FOREACH(tab, &tabshead, tabs) {
545 		toskip++;
546 		if (tab == current_tab)
547 			break;
548 	}
549 
550 	if (toskip * tabwidth < space)
551 		toskip = 0;
552 	else {
553 		ots = toskip;
554 		toskip--;
555 		while (toskip != 0 &&
556 		    (ots - toskip+1) * tabwidth < space)
557 			toskip--;
558 	}
559 
560 	werase(tabline);
561 	wattr_on(tabline, tab_face.background, NULL);
562 	wprintw(tabline, toskip == 0 ? " " : "<");
563 	wattr_off(tabline, tab_face.background, NULL);
564 
565 	truncated = 0;
566 	TAILQ_FOREACH(tab, &tabshead, tabs) {
567 		if (truncated)
568 			break;
569 		if (toskip != 0) {
570 			toskip--;
571 			continue;
572 		}
573 
574 		getyx(tabline, y, x);
575 		if (x + sizeof(buf)+2 >= (size_t)COLS)
576 			truncated = 1;
577 
578 		current = tab == current_tab;
579 
580 		if (*(title = tab->buffer.page.title) == '\0')
581 			title = tab->hist_cur->h;
582 
583 		if (tab->flags & TAB_URGENT)
584 			strlcpy(buf, "!", sizeof(buf));
585 		else
586 			strlcpy(buf, " ", sizeof(buf));
587 
588 		if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
589 			/* truncation happens */
590 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
591 		} else {
592 			/* pad with spaces */
593 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
594 				/* nop */ ;
595 		}
596 
597 		pair = current ? tab_face.current : tab_face.tab;
598 		wattr_on(tabline, pair, NULL);
599 		wprintw(tabline, "%s", buf);
600 		wattr_off(tabline, pair, NULL);
601 
602 		wattr_on(tabline, tab_face.background, NULL);
603 		if (TAILQ_NEXT(tab, tabs) != NULL)
604 			wprintw(tabline, "┃");
605 		wattr_off(tabline, tab_face.background, NULL);
606 	}
607 
608 	wattr_on(tabline, tab_face.background, NULL);
609 	for (; x < (size_t)COLS; ++x)
610 		waddch(tabline, ' ');
611 	if (truncated)
612 		mvwprintw(tabline, 0, COLS-1, ">");
613 	wattr_off(tabline, tab_face.background, NULL);
614 }
615 
616 /*
617  * Compute the first visible line around vl.  Try to search forward
618  * until the end of the buffer; if a visible line is not found, search
619  * backward.  Return NULL if no viable line was found.
620  */
621 struct vline *
622 adjust_line(struct vline *vl, struct buffer *buffer)
623 {
624 	struct vline *t;
625 
626 	if (vl == NULL)
627 		return NULL;
628 
629 	if (!(vl->parent->flags & L_HIDDEN))
630 		return vl;
631 
632 	/* search forward */
633 	for (t = vl;
634 	     t != NULL && t->parent->flags & L_HIDDEN;
635 	     t = TAILQ_NEXT(t, vlines))
636 		;		/* nop */
637 
638 	if (t != NULL)
639 		return t;
640 
641 	/* search backward */
642 	for (t = vl;
643 	     t != NULL && t->parent->flags & L_HIDDEN;
644 	     t = TAILQ_PREV(t, vhead, vlines))
645 		;		/* nop */
646 
647 	return t;
648 }
649 
650 static void
651 redraw_window(WINDOW *win, int off, int height, int width,
652     struct buffer *buffer)
653 {
654 	struct vline	*vl;
655 	int		 l, onscreen;
656 
657 	restore_curs_x(buffer);
658 
659 	/*
660 	 * TODO: ignoring buffer->force_update and always
661 	 * re-rendering.  In theory we can recompute the y position
662 	 * without a re-render, and optimize here.  It's not the only
663 	 * optimisation possible here, wscrl wolud also be an
664 	 * interesting one.
665 	 */
666 
667 again:
668 	werase(win);
669 	buffer->curs_y = 0;
670 
671 	if (TAILQ_EMPTY(&buffer->head))
672 		goto end;
673 
674 	if (buffer->top_line == NULL)
675 		buffer->top_line = TAILQ_FIRST(&buffer->head);
676 
677 	buffer->top_line = adjust_line(buffer->top_line, buffer);
678 	if (buffer->top_line == NULL)
679 		goto end;
680 
681 	buffer->current_line = adjust_line(buffer->current_line, buffer);
682 
683 	l = 0;
684 	onscreen = 0;
685 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
686 		if (vl->parent->flags & L_HIDDEN)
687 			continue;
688 
689 		wmove(win, l, 0);
690 		print_vline(off, width, win, vl);
691 
692 		if (vl == buffer->current_line)
693 			onscreen = 1;
694 
695 		if (!onscreen)
696 			buffer->curs_y++;
697 
698 		l++;
699 		if (l == height)
700 			break;
701 	}
702 
703 	if (!onscreen) {
704 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
705 			if (vl == buffer->current_line)
706 				break;
707 			if (vl->parent->flags & L_HIDDEN)
708 				continue;
709 			buffer->line_off++;
710 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
711 		}
712 
713 		if (vl != NULL)
714 			goto again;
715 	}
716 
717 	buffer->last_line_off = buffer->line_off;
718 	buffer->force_redraw = 0;
719 end:
720 	wmove(win, buffer->curs_y, buffer->curs_x);
721 }
722 
723 static void
724 redraw_download(void)
725 {
726 	redraw_window(download, 0, download_lines, COLS, &downloadwin);
727 }
728 
729 static void
730 redraw_help(void)
731 {
732 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
733 }
734 
735 static void
736 redraw_body(struct tab *tab)
737 {
738 	static struct tab *last_tab;
739 
740 	if (last_tab != tab)
741 		tab->buffer.force_redraw =1;
742 	last_tab = tab;
743 
744 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
745 }
746 
747 static inline char
748 trust_status_char(enum trust_state ts)
749 {
750 	switch (ts) {
751 	case TS_UNKNOWN:	return '-';
752 	case TS_UNTRUSTED:	return '!';
753 	case TS_TEMP_TRUSTED:	return '!';
754 	case TS_TRUSTED:	return 'v';
755 	case TS_VERIFIED:	return 'V';
756 	default:		return 'X';
757 	}
758 }
759 
760 static void
761 redraw_modeline(struct tab *tab)
762 {
763 	struct buffer	*buffer;
764 	double		 pct;
765 	int		 x, y, max_x, max_y;
766 	const char	*mode;
767 	const char	*spin = "-\\|/";
768 
769 	buffer = current_buffer();
770 	mode = buffer->page.name;
771 
772 	werase(modeline);
773 	wattr_on(modeline, modeline_face.background, NULL);
774 	wmove(modeline, 0, 0);
775 
776 	wprintw(modeline, "-%c%c %s ",
777 	    spin[tab->loading_anim_step],
778 	    trust_status_char(tab->trust),
779 	    mode == NULL ? "(none)" : mode);
780 
781 	pct = (buffer->line_off + buffer->curs_y) * 100.0
782 		/ buffer->line_max;
783 
784 	if (buffer->line_max <= (size_t)body_lines)
785 		wprintw(modeline, "All ");
786 	else if (buffer->line_off == 0)
787 		wprintw(modeline, "Top ");
788 	else if (buffer->line_off + body_lines >= buffer->line_max)
789 		wprintw(modeline, "Bottom ");
790 	else
791 		wprintw(modeline, "%.0f%% ", pct);
792 
793 	wprintw(modeline, "%d/%d %s ",
794 	    buffer->line_off + buffer->curs_y,
795 	    buffer->line_max,
796 	    tab->hist_cur->h);
797 
798 	getyx(modeline, y, x);
799 	getmaxyx(modeline, max_y, max_x);
800 
801 	(void)y;
802 	(void)max_y;
803 
804 	for (; x < max_x; ++x)
805 		waddstr(modeline, "-");
806 
807 	wattr_off(modeline, modeline_face.background, NULL);
808 }
809 
810 static void
811 redraw_minibuffer(void)
812 {
813 	wattr_on(echoarea, minibuffer_face.background, NULL);
814 	werase(echoarea);
815 
816 	if (in_minibuffer)
817 		do_redraw_minibuffer();
818 	else
819 		do_redraw_echoarea();
820 
821 	if (in_minibuffer == MB_COMPREAD)
822 		do_redraw_minibuffer_compl();
823 
824 	wattr_off(echoarea, minibuffer_face.background, NULL);
825 }
826 
827 static void
828 do_redraw_echoarea(void)
829 {
830 	struct vline *vl;
831 
832 	if (ministate.curmesg != NULL)
833 		wprintw(echoarea, "%s", ministate.curmesg);
834 	else if (*keybuf != '\0')
835 		waddstr(echoarea, keybuf);
836 	else {
837 		/* If nothing else, show the URL at point */
838 		vl = current_tab->buffer.current_line;
839 		if (vl != NULL && vl->parent->type == LINE_LINK)
840 			waddstr(echoarea, vl->parent->alt);
841 	}
842 }
843 
844 static void
845 do_redraw_minibuffer(void)
846 {
847 	struct buffer	*cmplbuf, *buffer;
848 	size_t		 off_y, off_x = 0;
849 	const char	*start, *c;
850 
851 	cmplbuf = &ministate.compl.buffer;
852 	buffer = &ministate.buffer;
853 	(void)off_y;		/* unused, set by getyx */
854 
855 	wmove(echoarea, 0, 0);
856 
857 	if (in_minibuffer == MB_COMPREAD)
858 		wprintw(echoarea, "(%2d) ",
859 		    cmplbuf->line_max);
860 
861 	wprintw(echoarea, "%s", ministate.prompt);
862 	if (ministate.hist_cur != NULL)
863 		wprintw(echoarea, "(%zu/%zu) ",
864 		    ministate.hist_off + 1,
865 		    ministate.history->len);
866 
867 	getyx(echoarea, off_y, off_x);
868 
869 	start = ministate.hist_cur != NULL
870 		? ministate.hist_cur->h
871 		: ministate.buf;
872 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
873 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
874 		start = utf8_next_cp(start);
875 	}
876 
877 	waddstr(echoarea, start);
878 
879 	if (ministate.curmesg != NULL)
880 		wprintw(echoarea, " [%s]", ministate.curmesg);
881 
882 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
883 }
884 
885 static void
886 do_redraw_minibuffer_compl(void)
887 {
888 	redraw_window(minibuffer, 0, 10, COLS,
889 	    &ministate.compl.buffer);
890 }
891 
892 /*
893  * Place the cursor in the right ncurses window.  If soft is 1, use
894  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
895  * wrefresh.
896  */
897 static void
898 place_cursor(int soft)
899 {
900 	int (*touch)(WINDOW *);
901 
902 	if (soft)
903 		touch = wnoutrefresh;
904 	else
905 		touch = wrefresh;
906 
907 	if (in_minibuffer) {
908 		if (side_window & SIDE_WINDOW_LEFT)
909 			touch(help);
910 		if (side_window & SIDE_WINDOW_BOTTOM)
911 			touch(download);
912 		touch(body);
913 		touch(echoarea);
914 	} else if (in_side_window & SIDE_WINDOW_LEFT) {
915 		touch(body);
916 		touch(echoarea);
917                 if (in_side_window & SIDE_WINDOW_BOTTOM)
918 			touch(download);
919 		touch(help);
920 	} else if (in_side_window & SIDE_WINDOW_BOTTOM) {
921 		touch(body);
922 		touch(echoarea);
923 		if (in_side_window & SIDE_WINDOW_LEFT)
924 			touch(help);
925 		touch(download);
926 	} else {
927 		if (side_window & SIDE_WINDOW_LEFT)
928 			touch(help);
929 		if (side_window & SIDE_WINDOW_BOTTOM)
930 			touch(download);
931 		touch(echoarea);
932 		touch(body);
933 	}
934 }
935 
936 static void
937 redraw_tab(struct tab *tab)
938 {
939 	if (too_small)
940 		return;
941 
942 	if (side_window & SIDE_WINDOW_LEFT) {
943 		redraw_help();
944 		wnoutrefresh(help);
945 	}
946 
947 	if (side_window & SIDE_WINDOW_BOTTOM) {
948 		redraw_download();
949 		wnoutrefresh(download);
950 	}
951 
952 	if (show_tab_bar)
953 		redraw_tabline();
954 
955 	redraw_body(tab);
956 	redraw_modeline(tab);
957 	redraw_minibuffer();
958 
959 	wnoutrefresh(tabline);
960 	wnoutrefresh(modeline);
961 
962 	if (in_minibuffer == MB_COMPREAD)
963 		wnoutrefresh(minibuffer);
964 
965 	place_cursor(1);
966 
967 	doupdate();
968 
969 	if (set_title)
970 		dprintf(1, "\033]2;%s - Telescope\a",
971 		    current_tab->buffer.page.title);
972 }
973 
974 void
975 start_loading_anim(struct tab *tab)
976 {
977 	if (tab->loading_anim)
978 		return;
979 	tab->loading_anim = 1;
980 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
981 	evtimer_add(&tab->loadingev, &loadingev_timer);
982 }
983 
984 static void
985 update_loading_anim(int fd, short ev, void *d)
986 {
987 	struct tab	*tab = d;
988 
989 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
990 
991 	if (tab == current_tab) {
992 		redraw_modeline(tab);
993 		wrefresh(modeline);
994 		wrefresh(body);
995 		if (in_minibuffer)
996 			wrefresh(echoarea);
997 	}
998 
999 	evtimer_add(&tab->loadingev, &loadingev_timer);
1000 }
1001 
1002 static void
1003 stop_loading_anim(struct tab *tab)
1004 {
1005 	if (!tab->loading_anim)
1006 		return;
1007 	evtimer_del(&tab->loadingev);
1008 	tab->loading_anim = 0;
1009 	tab->loading_anim_step = 0;
1010 
1011 	if (tab != current_tab)
1012 		return;
1013 
1014 	redraw_modeline(tab);
1015 
1016 	wrefresh(modeline);
1017 	wrefresh(body);
1018 	if (in_minibuffer)
1019 		wrefresh(echoarea);
1020 }
1021 
1022 int
1023 ui_print_colors(void)
1024 {
1025 	int colors = 0, pairs = 0, can_change = 0;
1026 	int columns = 16, lines, color, i, j;
1027 
1028 	initscr();
1029 	if (has_colors()) {
1030 		start_color();
1031 		use_default_colors();
1032 
1033 		colors = COLORS;
1034 		pairs = COLOR_PAIRS;
1035 		can_change = can_change_color();
1036 	}
1037 	endwin();
1038 
1039 	printf("Term info:\n");
1040 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1041 	    getenv("TERM"), colors, pairs, can_change);
1042 	printf("\n");
1043 
1044 	if (colors == 0) {
1045 		printf("No color support\n");
1046 		return 0;
1047 	}
1048 
1049 	printf("Available colors:\n\n");
1050 	lines = (colors - 1) / columns + 1;
1051 	color = 0;
1052 	for (i = 0; i < lines; ++i) {
1053 		for (j = 0; j < columns; ++j, ++color) {
1054 			printf("\033[0;38;5;%dm %03d", color, color);
1055 		}
1056 		printf("\n");
1057 	}
1058 
1059 	printf("\033[0m");
1060 	fflush(stdout);
1061 	return 0;
1062 }
1063 
1064 int
1065 ui_init()
1066 {
1067 	setlocale(LC_ALL, "");
1068 
1069 	if (TAILQ_EMPTY(&global_map.m)) {
1070 		fprintf(stderr, "no keys defined!\n");
1071 		return 0;
1072 	}
1073 
1074 	minibuffer_init();
1075 
1076 	/* initialize download window */
1077 	TAILQ_INIT(&downloadwin.head);
1078 	TAILQ_INIT(&downloadwin.page.head);
1079 
1080 	/* initialize help window */
1081 	TAILQ_INIT(&helpwin.head);
1082 	TAILQ_INIT(&helpwin.page.head);
1083 
1084 	base_map = &global_map;
1085 	current_map = &global_map;
1086 
1087 	initscr();
1088 
1089 	if (enable_colors) {
1090 		if (has_colors()) {
1091 			start_color();
1092 			use_default_colors();
1093 		} else
1094 			enable_colors = 0;
1095 	}
1096 
1097 	config_apply_style();
1098 
1099 	raw();
1100 	noecho();
1101 	nonl();
1102 	intrflush(stdscr, FALSE);
1103 
1104 	if ((tabline = newwin(1, 1, 0, 0)) == NULL)
1105 		return 0;
1106 	if ((body = newwin(1, 1, 0, 0)) == NULL)
1107 		return 0;
1108 	if ((modeline = newwin(1, 1, 0, 0)) == NULL)
1109 		return 0;
1110 	if ((echoarea = newwin(1, 1, 0, 0)) == NULL)
1111 		return 0;
1112 	if ((minibuffer = newwin(1, 1, 0, 0)) == NULL)
1113 		return 0;
1114 	if ((download = newwin(1, 1, 0, 0)) == NULL)
1115 		return 0;
1116 	if ((help = newwin(1, 1, 0, 0)) == NULL)
1117 		return 0;
1118 
1119 	wbkgd(body, body_face.body);
1120 	wbkgd(download, download_face.background);
1121 	wbkgd(echoarea, minibuffer_face.background);
1122 
1123 	update_x_offset();
1124 
1125 	keypad(body, TRUE);
1126 	scrollok(body, FALSE);
1127 
1128 	/* non-blocking input */
1129 	wtimeout(body, 0);
1130 	wtimeout(help, 0);
1131 
1132 	mvwprintw(body, 0, 0, "");
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 	return 1;
1143 }
1144 
1145 void
1146 ui_main_loop(void)
1147 {
1148 	switch_to_tab(current_tab);
1149 	rearrange_windows();
1150 
1151 	event_dispatch();
1152 }
1153 
1154 void
1155 ui_on_tab_loaded(struct tab *tab)
1156 {
1157 	stop_loading_anim(tab);
1158 	message("Loaded %s", tab->hist_cur->h);
1159 
1160 	if (show_tab_bar)
1161 		redraw_tabline();
1162 
1163 	wrefresh(tabline);
1164 	place_cursor(0);
1165 }
1166 
1167 void
1168 ui_on_tab_refresh(struct tab *tab)
1169 {
1170 	wrap_page(&tab->buffer, body_cols);
1171 	if (tab == current_tab)
1172 		redraw_tab(tab);
1173 	else
1174 		tab->flags |= TAB_URGENT;
1175 }
1176 
1177 void
1178 ui_on_download_refresh(void)
1179 {
1180 	if (side_window & SIDE_WINDOW_BOTTOM) {
1181                 recompute_downloads();
1182 		redraw_tab(current_tab);
1183 	}
1184 }
1185 
1186 const char *
1187 ui_keyname(int k)
1188 {
1189 	return keyname(k);
1190 }
1191 
1192 void
1193 ui_toggle_side_window(int kind)
1194 {
1195 	if (in_side_window & kind)
1196 		ui_other_window();
1197 
1198 	side_window ^= kind;
1199 	if (side_window & SIDE_WINDOW_LEFT)
1200 		recompute_help();
1201 	if (side_window & SIDE_WINDOW_BOTTOM)
1202 		recompute_downloads();
1203 
1204 	/*
1205 	 * ugly hack, but otherwise the window doesn't get updated
1206 	 * until I call rearrange_windows a second time (e.g. via
1207 	 * C-l).  I will be happy to know why something like this is
1208 	 * needed.
1209 	 */
1210 	rearrange_windows();
1211 	rearrange_windows();
1212 }
1213 
1214 void
1215 ui_show_downloads_pane(void)
1216 {
1217 	if (!(side_window & SIDE_WINDOW_BOTTOM))
1218 		ui_toggle_side_window(SIDE_WINDOW_BOTTOM);
1219 }
1220 
1221 void
1222 ui_schedule_redraw(void)
1223 {
1224 	should_rearrange_windows = 1;
1225 }
1226 
1227 void
1228 ui_require_input(struct tab *tab, int hide, int proto)
1229 {
1230 	void (*fn)(void);
1231 
1232 	if (proto == PROTO_GEMINI)
1233 		fn = ir_select_gemini;
1234 	else if (proto == PROTO_GOPHER)
1235 		fn = ir_select_gopher;
1236 	else
1237 		abort();
1238 
1239 	/* TODO: hard-switching to another tab is ugly */
1240 	switch_to_tab(tab);
1241 
1242 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1243 	    &ir_history, NULL, NULL);
1244 	strlcpy(ministate.prompt, "Input required: ",
1245 	    sizeof(ministate.prompt));
1246 	redraw_tab(tab);
1247 }
1248 
1249 void
1250 ui_after_message_hook(void)
1251 {
1252 	redraw_minibuffer();
1253 	place_cursor(0);
1254 }
1255 
1256 void
1257 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1258     struct tab *data)
1259 {
1260 	yornp(prompt, fn, data);
1261 	redraw_tab(current_tab);
1262 }
1263 
1264 void
1265 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1266     struct tab *data, const char *input)
1267 {
1268 	minibuffer_read(prompt, fn, data);
1269 
1270 	if (input != NULL) {
1271 		strlcpy(ministate.buf, input, sizeof(ministate.buf));
1272 		cmd_move_end_of_line(&ministate.buffer);
1273 	}
1274 
1275 	redraw_tab(current_tab);
1276 }
1277 
1278 void
1279 ui_other_window(void)
1280 {
1281 	if (in_side_window & SIDE_WINDOW_LEFT &&
1282 	    side_window & SIDE_WINDOW_BOTTOM)
1283 		in_side_window = SIDE_WINDOW_BOTTOM;
1284 	else if (in_side_window)
1285 		in_side_window = 0;
1286 	else if (!in_side_window && side_window & SIDE_WINDOW_LEFT)
1287 		in_side_window = SIDE_WINDOW_LEFT;
1288 	else if (!in_side_window && side_window)
1289 		in_side_window = SIDE_WINDOW_BOTTOM;
1290 	else
1291 		message("No other window to select");
1292 }
1293 
1294 void
1295 ui_suspend(void)
1296 {
1297 	endwin();
1298 
1299 	kill(getpid(), SIGSTOP);
1300 
1301 	refresh();
1302 	clear();
1303 	rearrange_windows();
1304 }
1305 
1306 void
1307 ui_end(void)
1308 {
1309 	endwin();
1310 }