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Date:: Fri Nov 5 15:12:00 2021 UTC
Message:: simplify print_vline_descr
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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 	switch (vl->parent->type) {
439 	case LINE_COMPL:
440 	case LINE_COMPL_CURRENT:
441 		goal = width/2;
442 		break;
443 	case LINE_HELP:
444 	case LINE_DOWNLOAD:
445 	case LINE_DOWNLOAD_DONE:
446 	case LINE_DOWNLOAD_INFO:
447 		goal = 8;
448 		break;
449 	default:
450 		return;
451 	}
452 
453 	if (vl->parent->alt == NULL)
454 		return;
455 
456 	(void)y;
457 	getyx(window, y, x);
458 
459 	if (goal <= x)
460 		wprintw(window, " ");
461 	for (; goal > x; ++x)
462 		wprintw(window, " ");
463 
464 	wprintw(window, "%s", vl->parent->alt);
465 }
466 
467 /*
468  * Core part of the rendering.  It prints a vline starting from the
469  * current cursor position.  Printing a vline consists of skipping
470  * `off' columns (for olivetti-mode), print the correct prefix (which
471  * may be the emoji in case of emojified links-lines), printing the
472  * text itself, filling until width - off and filling off columns
473  * again.
474  */
475 static void
476 print_vline(int off, int width, WINDOW *window, struct vline *vl)
477 {
478 	/*
479 	 * Believe me or not, I've seen emoji ten code points long!
480 	 * That means, to stay large, 4*10 bytes + NUL.
481 	 */
482 	char emojibuf[41] = {0};
483 	const char *text, *prfx;
484 	struct line_face *f;
485 	int i, left, x, y;
486 
487 	f = &line_faces[vl->parent->type];
488 
489 	/* unused, set by getyx */
490 	(void)y;
491 
492 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
493 
494 	wattr_on(window, body_face.left, NULL);
495 	for (i = 0; i < off; i++)
496 		waddch(window, ' ');
497 	wattr_off(window, body_face.left, NULL);
498 
499 	wattr_on(window, f->prefix, NULL);
500 	wprintw(window, "%s", prfx);
501 	wattr_off(window, f->prefix, NULL);
502 
503 	wattr_on(window, f->text, NULL);
504 	wprintw(window, "%s", text);
505 	print_vline_descr(width, window, vl);
506 	wattr_off(window, f->text, NULL);
507 
508 	getyx(window, y, x);
509 
510 	left = width - x;
511 
512 	wattr_on(window, f->trail, NULL);
513 	for (i = 0; i < left - off; ++i)
514 		waddch(window, ' ');
515 	wattr_off(window, f->trail, NULL);
516 
517 	wattr_on(window, body_face.right, NULL);
518 	for (i = 0; i < off; i++)
519 		waddch(window, ' ');
520 	wattr_off(window, body_face.right, NULL);
521 
522 }
523 
524 static void
525 redraw_tabline(void)
526 {
527 	struct tab	*tab;
528 	size_t		 toskip, ots, tabwidth, space, x;
529 	int		 current, y, truncated, pair;
530 	const char	*title;
531 	char		 buf[25];
532 
533 	x = 0;
534 
535 	/* unused, but setted by a getyx */
536 	(void)y;
537 
538 	tabwidth = sizeof(buf)+1;
539 	space = COLS-2;
540 
541 	toskip = 0;
542 	TAILQ_FOREACH(tab, &tabshead, tabs) {
543 		toskip++;
544 		if (tab == current_tab)
545 			break;
546 	}
547 
548 	if (toskip * tabwidth < space)
549 		toskip = 0;
550 	else {
551 		ots = toskip;
552 		toskip--;
553 		while (toskip != 0 &&
554 		    (ots - toskip+1) * tabwidth < space)
555 			toskip--;
556 	}
557 
558 	werase(tabline);
559 	wattr_on(tabline, tab_face.background, NULL);
560 	wprintw(tabline, toskip == 0 ? " " : "<");
561 	wattr_off(tabline, tab_face.background, NULL);
562 
563 	truncated = 0;
564 	TAILQ_FOREACH(tab, &tabshead, tabs) {
565 		if (truncated)
566 			break;
567 		if (toskip != 0) {
568 			toskip--;
569 			continue;
570 		}
571 
572 		getyx(tabline, y, x);
573 		if (x + sizeof(buf)+2 >= (size_t)COLS)
574 			truncated = 1;
575 
576 		current = tab == current_tab;
577 
578 		if (*(title = tab->buffer.page.title) == '\0')
579 			title = tab->hist_cur->h;
580 
581 		if (tab->flags & TAB_URGENT)
582 			strlcpy(buf, "!", sizeof(buf));
583 		else
584 			strlcpy(buf, " ", sizeof(buf));
585 
586 		if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
587 			/* truncation happens */
588 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
589 		} else {
590 			/* pad with spaces */
591 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
592 				/* nop */ ;
593 		}
594 
595 		pair = current ? tab_face.current : tab_face.tab;
596 		wattr_on(tabline, pair, NULL);
597 		wprintw(tabline, "%s", buf);
598 		wattr_off(tabline, pair, NULL);
599 
600 		wattr_on(tabline, tab_face.background, NULL);
601 		if (TAILQ_NEXT(tab, tabs) != NULL)
602 			wprintw(tabline, "┃");
603 		wattr_off(tabline, tab_face.background, NULL);
604 	}
605 
606 	wattr_on(tabline, tab_face.background, NULL);
607 	for (; x < (size_t)COLS; ++x)
608 		waddch(tabline, ' ');
609 	if (truncated)
610 		mvwprintw(tabline, 0, COLS-1, ">");
611 	wattr_off(tabline, tab_face.background, NULL);
612 }
613 
614 /*
615  * Compute the first visible line around vl.  Try to search forward
616  * until the end of the buffer; if a visible line is not found, search
617  * backward.  Return NULL if no viable line was found.
618  */
619 struct vline *
620 adjust_line(struct vline *vl, struct buffer *buffer)
621 {
622 	struct vline *t;
623 
624 	if (vl == NULL)
625 		return NULL;
626 
627 	if (!(vl->parent->flags & L_HIDDEN))
628 		return vl;
629 
630 	/* search forward */
631 	for (t = vl;
632 	     t != NULL && t->parent->flags & L_HIDDEN;
633 	     t = TAILQ_NEXT(t, vlines))
634 		;		/* nop */
635 
636 	if (t != NULL)
637 		return t;
638 
639 	/* search backward */
640 	for (t = vl;
641 	     t != NULL && t->parent->flags & L_HIDDEN;
642 	     t = TAILQ_PREV(t, vhead, vlines))
643 		;		/* nop */
644 
645 	return t;
646 }
647 
648 static void
649 redraw_window(WINDOW *win, int off, int height, int width,
650     struct buffer *buffer)
651 {
652 	struct vline	*vl;
653 	int		 l, onscreen;
654 
655 	restore_curs_x(buffer);
656 
657 	/*
658 	 * TODO: ignoring buffer->force_update and always
659 	 * re-rendering.  In theory we can recompute the y position
660 	 * without a re-render, and optimize here.  It's not the only
661 	 * optimisation possible here, wscrl wolud also be an
662 	 * interesting one.
663 	 */
664 
665 again:
666 	werase(win);
667 	buffer->curs_y = 0;
668 
669 	if (TAILQ_EMPTY(&buffer->head))
670 		goto end;
671 
672 	if (buffer->top_line == NULL)
673 		buffer->top_line = TAILQ_FIRST(&buffer->head);
674 
675 	buffer->top_line = adjust_line(buffer->top_line, buffer);
676 	if (buffer->top_line == NULL)
677 		goto end;
678 
679 	buffer->current_line = adjust_line(buffer->current_line, buffer);
680 
681 	l = 0;
682 	onscreen = 0;
683 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
684 		if (vl->parent->flags & L_HIDDEN)
685 			continue;
686 
687 		wmove(win, l, 0);
688 		print_vline(off, width, win, vl);
689 
690 		if (vl == buffer->current_line)
691 			onscreen = 1;
692 
693 		if (!onscreen)
694 			buffer->curs_y++;
695 
696 		l++;
697 		if (l == height)
698 			break;
699 	}
700 
701 	if (!onscreen) {
702 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
703 			if (vl == buffer->current_line)
704 				break;
705 			if (vl->parent->flags & L_HIDDEN)
706 				continue;
707 			buffer->line_off++;
708 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
709 		}
710 
711 		if (vl != NULL)
712 			goto again;
713 	}
714 
715 	buffer->last_line_off = buffer->line_off;
716 	buffer->force_redraw = 0;
717 end:
718 	wmove(win, buffer->curs_y, buffer->curs_x);
719 }
720 
721 static void
722 redraw_download(void)
723 {
724 	redraw_window(download, 0, download_lines, COLS, &downloadwin);
725 }
726 
727 static void
728 redraw_help(void)
729 {
730 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
731 }
732 
733 static void
734 redraw_body(struct tab *tab)
735 {
736 	static struct tab *last_tab;
737 
738 	if (last_tab != tab)
739 		tab->buffer.force_redraw =1;
740 	last_tab = tab;
741 
742 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
743 }
744 
745 static inline char
746 trust_status_char(enum trust_state ts)
747 {
748 	switch (ts) {
749 	case TS_UNKNOWN:	return '-';
750 	case TS_UNTRUSTED:	return '!';
751 	case TS_TEMP_TRUSTED:	return '!';
752 	case TS_TRUSTED:	return 'v';
753 	case TS_VERIFIED:	return 'V';
754 	default:		return 'X';
755 	}
756 }
757 
758 static void
759 redraw_modeline(struct tab *tab)
760 {
761 	struct buffer	*buffer;
762 	double		 pct;
763 	int		 x, y, max_x, max_y;
764 	const char	*mode;
765 	const char	*spin = "-\\|/";
766 
767 	buffer = current_buffer();
768 	mode = buffer->page.name;
769 
770 	werase(modeline);
771 	wattr_on(modeline, modeline_face.background, NULL);
772 	wmove(modeline, 0, 0);
773 
774 	wprintw(modeline, "-%c%c %s ",
775 	    spin[tab->loading_anim_step],
776 	    trust_status_char(tab->trust),
777 	    mode == NULL ? "(none)" : mode);
778 
779 	pct = (buffer->line_off + buffer->curs_y) * 100.0
780 		/ buffer->line_max;
781 
782 	if (buffer->line_max <= (size_t)body_lines)
783 		wprintw(modeline, "All ");
784 	else if (buffer->line_off == 0)
785 		wprintw(modeline, "Top ");
786 	else if (buffer->line_off + body_lines >= buffer->line_max)
787 		wprintw(modeline, "Bottom ");
788 	else
789 		wprintw(modeline, "%.0f%% ", pct);
790 
791 	wprintw(modeline, "%d/%d %s ",
792 	    buffer->line_off + buffer->curs_y,
793 	    buffer->line_max,
794 	    tab->hist_cur->h);
795 
796 	getyx(modeline, y, x);
797 	getmaxyx(modeline, max_y, max_x);
798 
799 	(void)y;
800 	(void)max_y;
801 
802 	for (; x < max_x; ++x)
803 		waddstr(modeline, "-");
804 
805 	wattr_off(modeline, modeline_face.background, NULL);
806 }
807 
808 static void
809 redraw_minibuffer(void)
810 {
811 	wattr_on(echoarea, minibuffer_face.background, NULL);
812 	werase(echoarea);
813 
814 	if (in_minibuffer)
815 		do_redraw_minibuffer();
816 	else
817 		do_redraw_echoarea();
818 
819 	if (in_minibuffer == MB_COMPREAD)
820 		do_redraw_minibuffer_compl();
821 
822 	wattr_off(echoarea, minibuffer_face.background, NULL);
823 }
824 
825 static void
826 do_redraw_echoarea(void)
827 {
828 	struct vline *vl;
829 
830 	if (ministate.curmesg != NULL)
831 		wprintw(echoarea, "%s", ministate.curmesg);
832 	else if (*keybuf != '\0')
833 		waddstr(echoarea, keybuf);
834 	else {
835 		/* If nothing else, show the URL at point */
836 		vl = current_tab->buffer.current_line;
837 		if (vl != NULL && vl->parent->type == LINE_LINK)
838 			waddstr(echoarea, vl->parent->alt);
839 	}
840 }
841 
842 static void
843 do_redraw_minibuffer(void)
844 {
845 	struct buffer	*cmplbuf, *buffer;
846 	size_t		 off_y, off_x = 0;
847 	const char	*start, *c;
848 
849 	cmplbuf = &ministate.compl.buffer;
850 	buffer = &ministate.buffer;
851 	(void)off_y;		/* unused, set by getyx */
852 
853 	wmove(echoarea, 0, 0);
854 
855 	if (in_minibuffer == MB_COMPREAD)
856 		wprintw(echoarea, "(%2d) ",
857 		    cmplbuf->line_max);
858 
859 	wprintw(echoarea, "%s", ministate.prompt);
860 	if (ministate.hist_cur != NULL)
861 		wprintw(echoarea, "(%zu/%zu) ",
862 		    ministate.hist_off + 1,
863 		    ministate.history->len);
864 
865 	getyx(echoarea, off_y, off_x);
866 
867 	start = ministate.hist_cur != NULL
868 		? ministate.hist_cur->h
869 		: ministate.buf;
870 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
871 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
872 		start = utf8_next_cp(start);
873 	}
874 
875 	waddstr(echoarea, start);
876 
877 	if (ministate.curmesg != NULL)
878 		wprintw(echoarea, " [%s]", ministate.curmesg);
879 
880 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
881 }
882 
883 static void
884 do_redraw_minibuffer_compl(void)
885 {
886 	redraw_window(minibuffer, 0, 10, COLS,
887 	    &ministate.compl.buffer);
888 }
889 
890 /*
891  * Place the cursor in the right ncurses window.  If soft is 1, use
892  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
893  * wrefresh.
894  */
895 static void
896 place_cursor(int soft)
897 {
898 	int (*touch)(WINDOW *);
899 
900 	if (soft)
901 		touch = wnoutrefresh;
902 	else
903 		touch = wrefresh;
904 
905 	if (in_minibuffer) {
906 		if (side_window & SIDE_WINDOW_LEFT)
907 			touch(help);
908 		if (side_window & SIDE_WINDOW_BOTTOM)
909 			touch(download);
910 		touch(body);
911 		touch(echoarea);
912 	} else if (in_side_window & SIDE_WINDOW_LEFT) {
913 		touch(body);
914 		touch(echoarea);
915                 if (in_side_window & SIDE_WINDOW_BOTTOM)
916 			touch(download);
917 		touch(help);
918 	} else if (in_side_window & SIDE_WINDOW_BOTTOM) {
919 		touch(body);
920 		touch(echoarea);
921 		if (in_side_window & SIDE_WINDOW_LEFT)
922 			touch(help);
923 		touch(download);
924 	} else {
925 		if (side_window & SIDE_WINDOW_LEFT)
926 			touch(help);
927 		if (side_window & SIDE_WINDOW_BOTTOM)
928 			touch(download);
929 		touch(echoarea);
930 		touch(body);
931 	}
932 }
933 
934 static void
935 redraw_tab(struct tab *tab)
936 {
937 	if (too_small)
938 		return;
939 
940 	if (side_window & SIDE_WINDOW_LEFT) {
941 		redraw_help();
942 		wnoutrefresh(help);
943 	}
944 
945 	if (side_window & SIDE_WINDOW_BOTTOM) {
946 		redraw_download();
947 		wnoutrefresh(download);
948 	}
949 
950 	if (show_tab_bar)
951 		redraw_tabline();
952 
953 	redraw_body(tab);
954 	redraw_modeline(tab);
955 	redraw_minibuffer();
956 
957 	wnoutrefresh(tabline);
958 	wnoutrefresh(modeline);
959 
960 	if (in_minibuffer == MB_COMPREAD)
961 		wnoutrefresh(minibuffer);
962 
963 	place_cursor(1);
964 
965 	doupdate();
966 
967 	if (set_title)
968 		dprintf(1, "\033]2;%s - Telescope\a",
969 		    current_tab->buffer.page.title);
970 }
971 
972 void
973 start_loading_anim(struct tab *tab)
974 {
975 	if (tab->loading_anim)
976 		return;
977 	tab->loading_anim = 1;
978 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
979 	evtimer_add(&tab->loadingev, &loadingev_timer);
980 }
981 
982 static void
983 update_loading_anim(int fd, short ev, void *d)
984 {
985 	struct tab	*tab = d;
986 
987 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
988 
989 	if (tab == current_tab) {
990 		redraw_modeline(tab);
991 		wrefresh(modeline);
992 		wrefresh(body);
993 		if (in_minibuffer)
994 			wrefresh(echoarea);
995 	}
996 
997 	evtimer_add(&tab->loadingev, &loadingev_timer);
998 }
999 
1000 static void
1001 stop_loading_anim(struct tab *tab)
1002 {
1003 	if (!tab->loading_anim)
1004 		return;
1005 	evtimer_del(&tab->loadingev);
1006 	tab->loading_anim = 0;
1007 	tab->loading_anim_step = 0;
1008 
1009 	if (tab != current_tab)
1010 		return;
1011 
1012 	redraw_modeline(tab);
1013 
1014 	wrefresh(modeline);
1015 	wrefresh(body);
1016 	if (in_minibuffer)
1017 		wrefresh(echoarea);
1018 }
1019 
1020 int
1021 ui_print_colors(void)
1022 {
1023 	int colors = 0, pairs = 0, can_change = 0;
1024 	int columns = 16, lines, color, i, j;
1025 
1026 	initscr();
1027 	if (has_colors()) {
1028 		start_color();
1029 		use_default_colors();
1030 
1031 		colors = COLORS;
1032 		pairs = COLOR_PAIRS;
1033 		can_change = can_change_color();
1034 	}
1035 	endwin();
1036 
1037 	printf("Term info:\n");
1038 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1039 	    getenv("TERM"), colors, pairs, can_change);
1040 	printf("\n");
1041 
1042 	if (colors == 0) {
1043 		printf("No color support\n");
1044 		return 0;
1045 	}
1046 
1047 	printf("Available colors:\n\n");
1048 	lines = (colors - 1) / columns + 1;
1049 	color = 0;
1050 	for (i = 0; i < lines; ++i) {
1051 		for (j = 0; j < columns; ++j, ++color) {
1052 			printf("\033[0;38;5;%dm %03d", color, color);
1053 		}
1054 		printf("\n");
1055 	}
1056 
1057 	printf("\033[0m");
1058 	fflush(stdout);
1059 	return 0;
1060 }
1061 
1062 int
1063 ui_init()
1064 {
1065 	setlocale(LC_ALL, "");
1066 
1067 	if (TAILQ_EMPTY(&global_map.m)) {
1068 		fprintf(stderr, "no keys defined!\n");
1069 		return 0;
1070 	}
1071 
1072 	minibuffer_init();
1073 
1074 	/* initialize download window */
1075 	TAILQ_INIT(&downloadwin.head);
1076 	TAILQ_INIT(&downloadwin.page.head);
1077 
1078 	/* initialize help window */
1079 	TAILQ_INIT(&helpwin.head);
1080 	TAILQ_INIT(&helpwin.page.head);
1081 
1082 	base_map = &global_map;
1083 	current_map = &global_map;
1084 
1085 	initscr();
1086 
1087 	if (enable_colors) {
1088 		if (has_colors()) {
1089 			start_color();
1090 			use_default_colors();
1091 		} else
1092 			enable_colors = 0;
1093 	}
1094 
1095 	config_apply_style();
1096 
1097 	raw();
1098 	noecho();
1099 	nonl();
1100 	intrflush(stdscr, FALSE);
1101 
1102 	if ((tabline = newwin(1, 1, 0, 0)) == NULL)
1103 		return 0;
1104 	if ((body = newwin(1, 1, 0, 0)) == NULL)
1105 		return 0;
1106 	if ((modeline = newwin(1, 1, 0, 0)) == NULL)
1107 		return 0;
1108 	if ((echoarea = newwin(1, 1, 0, 0)) == NULL)
1109 		return 0;
1110 	if ((minibuffer = newwin(1, 1, 0, 0)) == NULL)
1111 		return 0;
1112 	if ((download = newwin(1, 1, 0, 0)) == NULL)
1113 		return 0;
1114 	if ((help = newwin(1, 1, 0, 0)) == NULL)
1115 		return 0;
1116 
1117 	wbkgd(body, body_face.body);
1118 	wbkgd(download, download_face.background);
1119 	wbkgd(echoarea, minibuffer_face.background);
1120 
1121 	update_x_offset();
1122 
1123 	keypad(body, TRUE);
1124 	scrollok(body, FALSE);
1125 
1126 	/* non-blocking input */
1127 	wtimeout(body, 0);
1128 	wtimeout(help, 0);
1129 
1130 	mvwprintw(body, 0, 0, "");
1131 
1132 	evtimer_set(&resizeev, handle_resize, NULL);
1133 
1134 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1135 	event_add(&stdioev, NULL);
1136 
1137 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1138 	signal_add(&winchev, NULL);
1139 
1140 	return 1;
1141 }
1142 
1143 void
1144 ui_main_loop(void)
1145 {
1146 	switch_to_tab(current_tab);
1147 	rearrange_windows();
1148 
1149 	event_dispatch();
1150 }
1151 
1152 void
1153 ui_on_tab_loaded(struct tab *tab)
1154 {
1155 	stop_loading_anim(tab);
1156 	message("Loaded %s", tab->hist_cur->h);
1157 
1158 	if (show_tab_bar)
1159 		redraw_tabline();
1160 
1161 	wrefresh(tabline);
1162 	place_cursor(0);
1163 }
1164 
1165 void
1166 ui_on_tab_refresh(struct tab *tab)
1167 {
1168 	wrap_page(&tab->buffer, body_cols);
1169 	if (tab == current_tab)
1170 		redraw_tab(tab);
1171 	else
1172 		tab->flags |= TAB_URGENT;
1173 }
1174 
1175 const char *
1176 ui_keyname(int k)
1177 {
1178 	return keyname(k);
1179 }
1180 
1181 void
1182 ui_toggle_side_window(int kind)
1183 {
1184 	if (in_side_window & kind)
1185 		ui_other_window();
1186 
1187 	side_window ^= kind;
1188 	if (side_window & SIDE_WINDOW_LEFT)
1189 		recompute_help();
1190 	if (side_window & SIDE_WINDOW_BOTTOM)
1191 		recompute_downloads();
1192 
1193 	/*
1194 	 * ugly hack, but otherwise the window doesn't get updated
1195 	 * until I call rearrange_windows a second time (e.g. via
1196 	 * C-l).  I will be happy to know why something like this is
1197 	 * needed.
1198 	 */
1199 	rearrange_windows();
1200 	rearrange_windows();
1201 }
1202 
1203 void
1204 ui_schedule_redraw(void)
1205 {
1206 	should_rearrange_windows = 1;
1207 }
1208 
1209 void
1210 ui_require_input(struct tab *tab, int hide, int proto)
1211 {
1212 	void (*fn)(void);
1213 
1214 	if (proto == PROTO_GEMINI)
1215 		fn = ir_select_gemini;
1216 	else if (proto == PROTO_GOPHER)
1217 		fn = ir_select_gopher;
1218 	else
1219 		abort();
1220 
1221 	/* TODO: hard-switching to another tab is ugly */
1222 	switch_to_tab(tab);
1223 
1224 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1225 	    &ir_history, NULL, NULL);
1226 	strlcpy(ministate.prompt, "Input required: ",
1227 	    sizeof(ministate.prompt));
1228 	redraw_tab(tab);
1229 }
1230 
1231 void
1232 ui_after_message_hook(void)
1233 {
1234 	redraw_minibuffer();
1235 	place_cursor(0);
1236 }
1237 
1238 void
1239 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1240     struct tab *data)
1241 {
1242 	yornp(prompt, fn, data);
1243 	redraw_tab(current_tab);
1244 }
1245 
1246 void
1247 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1248     struct tab *data, const char *input)
1249 {
1250 	minibuffer_read(prompt, fn, data);
1251 
1252 	if (input != NULL) {
1253 		strlcpy(ministate.buf, input, sizeof(ministate.buf));
1254 		cmd_move_end_of_line(&ministate.buffer);
1255 	}
1256 
1257 	redraw_tab(current_tab);
1258 }
1259 
1260 void
1261 ui_other_window(void)
1262 {
1263 	if (in_side_window & SIDE_WINDOW_LEFT &&
1264 	    side_window & SIDE_WINDOW_BOTTOM)
1265 		in_side_window = SIDE_WINDOW_BOTTOM;
1266 	else if (in_side_window)
1267 		in_side_window = 0;
1268 	else if (!in_side_window && side_window & SIDE_WINDOW_LEFT)
1269 		in_side_window = SIDE_WINDOW_LEFT;
1270 	else if (!in_side_window && side_window)
1271 		in_side_window = SIDE_WINDOW_BOTTOM;
1272 	else
1273 		message("No other window to select");
1274 }
1275 
1276 void
1277 ui_suspend(void)
1278 {
1279 	endwin();
1280 
1281 	kill(getpid(), SIGSTOP);
1282 
1283 	refresh();
1284 	clear();
1285 	rearrange_windows();
1286 }
1287 
1288 void
1289 ui_end(void)
1290 {
1291 	endwin();
1292 }