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Date:: Sat Aug 14 20:02:22 2021 UTC
Message:: wrap long lines
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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 "telescope.h"
47 #include "ui.h"
48 #include "utf8.h"
49 
50 static struct event	stdioev, winchev;
51 
52 static void		 restore_curs_x(struct buffer *);
53 
54 static int		 readkey(void);
55 static void		 dispatch_stdio(int, short, void*);
56 static void		 handle_resize(int, short, void*);
57 static void		 handle_resize_nodelay(int, short, void*);
58 static void		 rearrange_windows(void);
59 static void		 line_prefix_and_text(struct vline *, char *, size_t, const char **, const char **);
60 static void		 print_vline(int, int, WINDOW*, struct vline*);
61 static void		 redraw_tabline(void);
62 static void		 redraw_window(WINDOW*, int, int, int, struct buffer*);
63 static void		 redraw_help(void);
64 static void		 redraw_body(struct tab*);
65 static void		 redraw_modeline(struct tab*);
66 static void		 redraw_minibuffer(void);
67 static void		 do_redraw_echoarea(void);
68 static void		 do_redraw_minibuffer(void);
69 static void		 do_redraw_minibuffer_compl(void);
70 static void		 place_cursor(int);
71 static void		 redraw_tab(struct tab*);
72 static void		 update_loading_anim(int, short, void*);
73 static void		 stop_loading_anim(struct tab*);
74 
75 /*
76  * Used to know when we're finished loading.
77  */
78 static int		 operating;
79 
80 static int		 should_rearrange_windows;
81 static int		 too_small;
82 static int		 x_offset;
83 
84 struct thiskey	 thiskey;
85 struct tab	*current_tab;
86 
87 static struct event	resizeev;
88 static struct timeval	resize_timer = { 0, 250000 };
89 
90 static WINDOW	*tabline, *body, *modeline, *echoarea, *minibuffer;
91 
92 int			 body_lines, body_cols;
93 
94 static WINDOW		*help;
95 /* not static so we can see them from help.c */
96 struct buffer		 helpwin;
97 int			 help_lines, help_cols;
98 
99 static int		 side_window;
100 static int		 in_side_window;
101 
102 static struct timeval	loadingev_timer = { 0, 250000 };
103 
104 static uint32_t		 tab_counter;
105 
106 static char	keybuf[64];
107 
108 /* XXX: don't forget to init these in main() */
109 struct kmap global_map,
110 	minibuffer_map,
111 	*current_map,
112 	*base_map;
113 
114 static inline void
115 update_x_offset(void)
116 {
117 	if (olivetti_mode && fill_column < body_cols)
118 		x_offset = (body_cols - fill_column)/2;
119 	else
120 		x_offset = 0;
121 }
122 
123 void
124 save_excursion(struct excursion *place, struct buffer *buffer)
125 {
126 	place->curs_x = buffer->curs_x;
127 	place->curs_y = buffer->curs_y;
128 	place->line_off = buffer->line_off;
129 	place->top_line = buffer->top_line;
130 	place->current_line = buffer->current_line;
131 	place->cpoff = buffer->cpoff;
132 }
133 
134 void
135 restore_excursion(struct excursion *place, struct buffer *buffer)
136 {
137 	buffer->curs_x = place->curs_x;
138 	buffer->curs_y = place->curs_y;
139 	buffer->line_off = place->line_off;
140 	buffer->top_line = place->top_line;
141 	buffer->current_line = place->current_line;
142 	buffer->cpoff = place->cpoff;
143 }
144 
145 static void
146 restore_curs_x(struct buffer *buffer)
147 {
148 	struct vline	*vl;
149 	const char	*prfx, *text;
150 
151 	vl = buffer->current_line;
152 	if (vl == NULL || vl->line == NULL)
153 		buffer->curs_x = buffer->cpoff = 0;
154 	else if (vl->parent->data != NULL) {
155 		text = vl->parent->data;
156 		buffer->curs_x = utf8_snwidth(text + 1, buffer->cpoff) + 1;
157 	} else
158 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
159 
160 	buffer->curs_x += x_offset;
161 
162 	if (vl == NULL)
163 		return;
164 
165 	if (vl->parent->data != NULL)
166 		buffer->curs_x += utf8_swidth_between(vl->parent->line,
167 		    vl->parent->data);
168 	else {
169 		prfx = line_prefixes[vl->parent->type].prfx1;
170 		buffer->curs_x += utf8_swidth(prfx);
171 	}
172 }
173 
174 void
175 global_key_unbound(void)
176 {
177 	message("%s is undefined", keybuf);
178 }
179 
180 struct buffer *
181 current_buffer(void)
182 {
183 	if (in_minibuffer)
184 		return &ministate.buffer;
185 	if (in_side_window)
186 		return &helpwin;
187 	return &current_tab->buffer;
188 }
189 
190 static int
191 readkey(void)
192 {
193 	uint32_t state = 0;
194 
195 	if ((thiskey.key = wgetch(body)) == ERR)
196 		return 0;
197 
198 	thiskey.meta = thiskey.key == 27;
199 	if (thiskey.meta) {
200 		thiskey.key = wgetch(body);
201 		if (thiskey.key == ERR || thiskey.key == 27) {
202 			thiskey.meta = 0;
203 			thiskey.key = 27;
204 		}
205 	}
206 
207 	thiskey.cp = 0;
208 
209 	if ((unsigned int)thiskey.key >= UINT8_MAX)
210 		return 1;
211 
212 	while (1) {
213 		if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
214 			break;
215 		if ((thiskey.key = wgetch(body)) == ERR) {
216 			message("Error decoding user input");
217 			return 0;
218 		}
219 	}
220 
221 	return 1;
222 }
223 
224 static void
225 dispatch_stdio(int fd, short ev, void *d)
226 {
227 	struct keymap	*k;
228 	const char	*keyname;
229 	char		 tmp[5] = {0};
230 
231 	/* TODO: schedule a redraw? */
232 	if (too_small)
233 		return;
234 
235 	if (!readkey())
236 		return;
237 
238 	if (keybuf[0] != '\0')
239 		strlcat(keybuf, " ", sizeof(keybuf));
240 	if (thiskey.meta)
241 		strlcat(keybuf, "M-", sizeof(keybuf));
242 	if (thiskey.cp != 0) {
243 		utf8_encode(thiskey.cp, tmp);
244 		strlcat(keybuf, tmp, sizeof(keybuf));
245 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
246 		strlcat(keybuf, keyname, sizeof(keybuf));
247 	} else {
248 		tmp[0] = thiskey.key;
249 		strlcat(keybuf, tmp, sizeof(keybuf));
250 	}
251 
252 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
253 		if (k->meta == thiskey.meta &&
254 		    k->key == thiskey.key) {
255 			if (k->fn == NULL)
256 				current_map = &k->map;
257 			else {
258 				current_map = base_map;
259 				strlcpy(keybuf, "", sizeof(keybuf));
260 				k->fn(current_buffer());
261 			}
262 			goto done;
263 		}
264 	}
265 
266 	if (current_map->unhandled_input != NULL)
267 		current_map->unhandled_input();
268 	else
269 		global_key_unbound();
270 
271 	strlcpy(keybuf, "", sizeof(keybuf));
272 	current_map = base_map;
273 
274 done:
275 	if (side_window)
276 		recompute_help();
277 
278 	if (should_rearrange_windows)
279 		rearrange_windows();
280 	redraw_tab(current_tab);
281 }
282 
283 static void
284 handle_resize(int sig, short ev, void *d)
285 {
286 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
287 		event_del(&resizeev);
288 	}
289 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
290 	evtimer_add(&resizeev, &resize_timer);
291 }
292 
293 static void
294 handle_resize_nodelay(int s, short ev, void *d)
295 {
296 	endwin();
297 	refresh();
298 	clear();
299 
300 	rearrange_windows();
301 }
302 
303 static void
304 rearrange_windows(void)
305 {
306 	int		 lines;
307 
308 	should_rearrange_windows = 0;
309 
310 	lines = LINES;
311 
312 	if ((too_small = lines < 15)) {
313 		erase();
314 		printw("Window too small.");
315 		refresh();
316 		return;
317 	}
318 
319 	/* move and resize the windows, in reverse order! */
320 
321 	if (in_minibuffer == MB_COMPREAD) {
322 		mvwin(minibuffer, lines-10, 0);
323 		wresize(minibuffer, 10, COLS);
324 		lines -= 10;
325 
326 		wrap_page(&ministate.compl.buffer, COLS);
327 	}
328 
329 	mvwin(echoarea, --lines, 0);
330 	wresize(echoarea, 1, COLS);
331 
332 	mvwin(modeline, --lines, 0);
333 	wresize(modeline, 1, COLS);
334 
335 	body_lines = --lines;
336 	body_cols = COLS;
337 
338 	if (side_window) {
339 		help_cols = 0.3 * COLS;
340 		help_lines = lines;
341 		mvwin(help, 1, 0);
342 		wresize(help, help_lines, help_cols);
343 
344 		wrap_page(&helpwin, help_cols);
345 
346 		body_cols = COLS - help_cols - 1;
347 		mvwin(body, 1, help_cols);
348 	} else
349 		mvwin(body, 1, 0);
350 
351 	update_x_offset();
352 	wresize(body, body_lines, body_cols);
353 
354 	wresize(tabline, 1, COLS);
355 
356 	wrap_page(&current_tab->buffer, body_cols);
357 	redraw_tab(current_tab);
358 }
359 
360 static void
361 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
362     const char **prfx_ret, const char **text_ret)
363 {
364 	int type, i, cont, width;
365 	char *space, *t;
366 
367 	if ((*text_ret = vl->line) == NULL)
368 		*text_ret = "";
369 
370 	cont = vl->flags & L_CONTINUATION;
371 	type = vl->parent->type;
372 	if (!cont)
373 		*prfx_ret = line_prefixes[type].prfx1;
374 	else
375 		*prfx_ret = line_prefixes[type].prfx2;
376 
377 	space = vl->parent->data;
378 	if (!emojify_link || type != LINE_LINK || space == NULL)
379 		return;
380 
381 	if (cont) {
382 		memset(buf, 0, len);
383 		width = utf8_swidth_between(vl->parent->line, space);
384 		for (i = 0; i < width + 1; ++i)
385 			strlcat(buf, " ", len);
386 	} else {
387 		strlcpy(buf, *text_ret, len);
388 		if ((t = strchr(buf, ' ')) != NULL)
389 			*t = '\0';
390 		strlcat(buf, " ", len);
391 
392 		/* skip the emoji */
393                 *text_ret += (space - vl->parent->line) + 1;
394 	}
395 
396 	*prfx_ret = buf;
397 }
398 
399 static inline void
400 print_vline_descr(int width, WINDOW *window, struct vline *vl)
401 {
402 	int x, y, goal;
403 
404 	if (vl->parent->type != LINE_COMPL &&
405 	    vl->parent->type != LINE_COMPL_CURRENT &&
406 	    vl->parent->type != LINE_HELP)
407 		return;
408 
409 	if (vl->parent->alt == NULL)
410 		return;
411 
412 	(void)y;
413 	getyx(window, y, x);
414 
415 	if (vl->parent->type == LINE_HELP)
416 		goal = 8;
417 	else
418 		goal = width/2;
419 
420 	if (goal <= x)
421 		wprintw(window, " ");
422 	for (; goal > x; ++x)
423 		wprintw(window, " ");
424 
425 	wprintw(window, "%s", vl->parent->alt);
426 }
427 
428 /*
429  * Core part of the rendering.  It prints a vline starting from the
430  * current cursor position.  Printing a vline consists of skipping
431  * `off' columns (for olivetti-mode), print the correct prefix (which
432  * may be the emoji in case of emojified links-lines), printing the
433  * text itself, filling until width - off and filling off columns
434  * again.
435  */
436 static void
437 print_vline(int off, int width, WINDOW *window, struct vline *vl)
438 {
439 	/*
440 	 * Believe me or not, I've seen emoji ten code points long!
441 	 * That means, to stay large, 4*10 bytes + NUL.
442 	 */
443 	char emojibuf[41] = {0};
444 	const char *text, *prfx;
445 	struct line_face *f;
446 	int i, left, x, y;
447 
448 	f = &line_faces[vl->parent->type];
449 
450 	/* unused, set by getyx */
451 	(void)y;
452 
453 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
454 
455 	wattr_on(window, body_face.left, NULL);
456 	for (i = 0; i < off; i++)
457 		waddch(window, ' ');
458 	wattr_off(window, body_face.left, NULL);
459 
460 	wattr_on(window, f->prefix, NULL);
461 	wprintw(window, "%s", prfx);
462 	wattr_off(window, f->prefix, NULL);
463 
464 	wattr_on(window, f->text, NULL);
465 	wprintw(window, "%s", text);
466 	print_vline_descr(width, window, vl);
467 	wattr_off(window, f->text, NULL);
468 
469 	getyx(window, y, x);
470 
471 	left = width - x;
472 
473 	wattr_on(window, f->trail, NULL);
474 	for (i = 0; i < left - off; ++i)
475 		waddch(window, ' ');
476 	wattr_off(window, f->trail, NULL);
477 
478 	wattr_on(window, body_face.right, NULL);
479 	for (i = 0; i < off; i++)
480 		waddch(window, ' ');
481 	wattr_off(window, body_face.right, NULL);
482 
483 }
484 
485 static void
486 redraw_tabline(void)
487 {
488 	struct tab	*tab;
489 	size_t		 toskip, ots, tabwidth, space, x;
490 	int		 current, y, truncated, pair;
491 	const char	*title;
492 	char		 buf[25];
493 
494 	x = 0;
495 
496 	/* unused, but setted by a getyx */
497 	(void)y;
498 
499 	tabwidth = sizeof(buf)+1;
500 	space = COLS-2;
501 
502 	toskip = 0;
503 	TAILQ_FOREACH(tab, &tabshead, tabs) {
504 		toskip++;
505 		if (tab == current_tab)
506 			break;
507 	}
508 
509 	if (toskip * tabwidth < space)
510 		toskip = 0;
511 	else {
512 		ots = toskip;
513 		toskip--;
514                 while (toskip != 0 &&
515 		    (ots - toskip+1) * tabwidth < space)
516 			toskip--;
517 	}
518 
519 	werase(tabline);
520 	wattr_on(tabline, tab_face.background, NULL);
521 	wprintw(tabline, toskip == 0 ? " " : "<");
522 	wattr_off(tabline, tab_face.background, NULL);
523 
524 	truncated = 0;
525 	TAILQ_FOREACH(tab, &tabshead, tabs) {
526 		if (truncated)
527 			break;
528 		if (toskip != 0) {
529 			toskip--;
530 			continue;
531 		}
532 
533 		getyx(tabline, y, x);
534 		if (x + sizeof(buf)+2 >= (size_t)COLS)
535 			truncated = 1;
536 
537 		current = tab == current_tab;
538 
539 		if (*(title = tab->buffer.page.title) == '\0')
540 			title = tab->hist_cur->h;
541 
542 		if (tab->flags & TAB_URGENT)
543 			strlcpy(buf, "!", sizeof(buf));
544 		else
545 			strlcpy(buf, " ", sizeof(buf));
546 
547                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
548 			/* truncation happens */
549 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
550 		} else {
551 			/* pad with spaces */
552 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
553 				/* nop */ ;
554 		}
555 
556 		pair = current ? tab_face.current : tab_face.tab;
557 		wattr_on(tabline, pair, NULL);
558 		wprintw(tabline, "%s", buf);
559 		wattr_off(tabline, pair, NULL);
560 
561 		wattr_on(tabline, tab_face.background, NULL);
562 		if (TAILQ_NEXT(tab, tabs) != NULL)
563 			wprintw(tabline, "┃");
564 		wattr_off(tabline, tab_face.background, NULL);
565 	}
566 
567 	wattr_on(tabline, tab_face.background, NULL);
568 	for (; x < (size_t)COLS; ++x)
569 		waddch(tabline, ' ');
570 	if (truncated)
571 		mvwprintw(tabline, 0, COLS-1, ">");
572 	wattr_off(tabline, tab_face.background, NULL);
573 }
574 
575 /*
576  * Compute the first visible line around vl.  Try to search forward
577  * until the end of the buffer; if a visible line is not found, search
578  * backward.  Return NULL if no viable line was found.
579  */
580 struct vline *
581 adjust_line(struct vline *vl, struct buffer *buffer)
582 {
583 	struct vline *t;
584 
585 	if (vl == NULL)
586 		return NULL;
587 
588 	if (!(vl->parent->flags & L_HIDDEN))
589 		return vl;
590 
591 	/* search forward */
592 	for (t = vl;
593 	     t != NULL && t->parent->flags & L_HIDDEN;
594 	     t = TAILQ_NEXT(t, vlines))
595 		;		/* nop */
596 
597 	if (t != NULL)
598 		return t;
599 
600 	/* search backward */
601 	for (t = vl;
602 	     t != NULL && t->parent->flags & L_HIDDEN;
603 	     t = TAILQ_PREV(t, vhead, vlines))
604 		;		/* nop */
605 
606 	return t;
607 }
608 
609 static void
610 redraw_window(WINDOW *win, int off, int height, int width,
611     struct buffer *buffer)
612 {
613 	struct vline	*vl;
614 	int		 l, onscreen;
615 
616 	restore_curs_x(buffer);
617 
618 	/*
619 	 * TODO: ignoring buffer->force_update and always
620 	 * re-rendering.  In theory we can recompute the y position
621 	 * without a re-render, and optimize here.  It's not the only
622 	 * optimisation possible here, wscrl wolud also be an
623 	 * interesting one.
624 	 */
625 
626 again:
627 	werase(win);
628 	buffer->curs_y = 0;
629 
630 	if (TAILQ_EMPTY(&buffer->head))
631 		goto end;
632 
633 	if (buffer->top_line == NULL)
634 		buffer->top_line = TAILQ_FIRST(&buffer->head);
635 
636 	buffer->top_line = adjust_line(buffer->top_line, buffer);
637 	if (buffer->top_line == NULL)
638 		goto end;
639 
640 	buffer->current_line = adjust_line(buffer->current_line, buffer);
641 
642 	l = 0;
643 	onscreen = 0;
644 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
645 		if (vl->parent->flags & L_HIDDEN)
646 			continue;
647 
648 		wmove(win, l, 0);
649 		print_vline(off, width, win, vl);
650 
651 		if (vl == buffer->current_line)
652 			onscreen = 1;
653 
654 		if (!onscreen)
655 			buffer->curs_y++;
656 
657 		l++;
658 		if (l == height)
659 			break;
660 	}
661 
662 	if (!onscreen) {
663 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
664 			if (vl == buffer->current_line)
665 				break;
666 			if (vl->parent->flags & L_HIDDEN)
667 				continue;
668 			buffer->line_off++;
669 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
670 		}
671 
672 		if (vl != NULL)
673 			goto again;
674 	}
675 
676 	buffer->last_line_off = buffer->line_off;
677 	buffer->force_redraw = 0;
678 end:
679 	wmove(win, buffer->curs_y, buffer->curs_x);
680 }
681 
682 static void
683 redraw_help(void)
684 {
685 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
686 }
687 
688 static void
689 redraw_body(struct tab *tab)
690 {
691 	static struct tab *last_tab;
692 
693 	if (last_tab != tab)
694 		tab->buffer.force_redraw =1;
695 	last_tab = tab;
696 
697 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
698 }
699 
700 static inline char
701 trust_status_char(enum trust_state ts)
702 {
703 	switch (ts) {
704 	case TS_UNKNOWN:	return '-';
705 	case TS_UNTRUSTED:	return '!';
706 	case TS_TEMP_TRUSTED:	return '!';
707 	case TS_TRUSTED:	return 'v';
708 	case TS_VERIFIED:	return 'V';
709 	default:		return 'X';
710 	}
711 }
712 
713 static void
714 redraw_modeline(struct tab *tab)
715 {
716 	struct buffer	*buffer;
717 	double		 pct;
718 	int		 x, y, max_x, max_y;
719 	const char	*mode;
720 	const char	*spin = "-\\|/";
721 
722 	buffer = current_buffer();
723 	mode = buffer->page.name;
724 
725 	werase(modeline);
726 	wattr_on(modeline, modeline_face.background, NULL);
727 	wmove(modeline, 0, 0);
728 
729 	wprintw(modeline, "-%c%c %s ",
730 	    spin[tab->loading_anim_step],
731 	    trust_status_char(tab->trust),
732 	    mode == NULL ? "(none)" : mode);
733 
734 	pct = (buffer->line_off + buffer->curs_y) * 100.0
735 		/ buffer->line_max;
736 
737 	if (buffer->line_max <= (size_t)body_lines)
738                 wprintw(modeline, "All ");
739 	else if (buffer->line_off == 0)
740                 wprintw(modeline, "Top ");
741 	else if (buffer->line_off + body_lines >= buffer->line_max)
742 		wprintw(modeline, "Bottom ");
743 	else
744 		wprintw(modeline, "%.0f%% ", pct);
745 
746 	wprintw(modeline, "%d/%d %s ",
747 	    buffer->line_off + buffer->curs_y,
748 	    buffer->line_max,
749 	    tab->hist_cur->h);
750 
751 	getyx(modeline, y, x);
752 	getmaxyx(modeline, max_y, max_x);
753 
754 	(void)y;
755 	(void)max_y;
756 
757 	for (; x < max_x; ++x)
758 		waddstr(modeline, "-");
759 
760 	wattr_off(modeline, modeline_face.background, NULL);
761 }
762 
763 static void
764 redraw_minibuffer(void)
765 {
766 	wattr_on(echoarea, minibuffer_face.background, NULL);
767 	werase(echoarea);
768 
769 	if (in_minibuffer)
770 		do_redraw_minibuffer();
771 	else
772 		do_redraw_echoarea();
773 
774 	if (in_minibuffer == MB_COMPREAD)
775 		do_redraw_minibuffer_compl();
776 
777 	wattr_off(echoarea, minibuffer_face.background, NULL);
778 }
779 
780 static void
781 do_redraw_echoarea(void)
782 {
783 	struct vline *vl;
784 
785 	if (ministate.curmesg != NULL)
786                 wprintw(echoarea, "%s", ministate.curmesg);
787 	else if (*keybuf != '\0')
788 		waddstr(echoarea, keybuf);
789 	else {
790 		/* If nothing else, show the URL at point */
791 		vl = current_tab->buffer.current_line;
792 		if (vl != NULL && vl->parent->type == LINE_LINK)
793 			waddstr(echoarea, vl->parent->alt);
794 	}
795 }
796 
797 static void
798 do_redraw_minibuffer(void)
799 {
800 	struct buffer	*cmplbuf, *buffer;
801 	size_t		 off_y, off_x = 0;
802 	const char	*start, *c;
803 
804 	cmplbuf = &ministate.compl.buffer;
805 	buffer = &ministate.buffer;
806 	(void)off_y;		/* unused, set by getyx */
807 
808 	wmove(echoarea, 0, 0);
809 
810 	if (in_minibuffer == MB_COMPREAD)
811 		wprintw(echoarea, "(%2d) ",
812 		    cmplbuf->line_max);
813 
814 	wprintw(echoarea, "%s", ministate.prompt);
815 	if (ministate.hist_cur != NULL)
816 		wprintw(echoarea, "(%zu/%zu) ",
817 		    ministate.hist_off + 1,
818 		    ministate.history->len);
819 
820 	getyx(echoarea, off_y, off_x);
821 
822 	start = ministate.hist_cur != NULL
823 		? ministate.hist_cur->h
824 		: ministate.buf;
825 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
826 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
827 		start = utf8_next_cp(start);
828 	}
829 
830 	waddstr(echoarea, start);
831 
832 	if (ministate.curmesg != NULL)
833 		wprintw(echoarea, " [%s]", ministate.curmesg);
834 
835 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
836 }
837 
838 static void
839 do_redraw_minibuffer_compl(void)
840 {
841 	redraw_window(minibuffer, 0, 10, COLS,
842 	    &ministate.compl.buffer);
843 }
844 
845 /*
846  * Place the cursor in the right ncurses window.  If soft is 1, use
847  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
848  * wrefresh.
849  */
850 static void
851 place_cursor(int soft)
852 {
853 	int (*touch)(WINDOW *);
854 
855 	if (soft)
856 		touch = wnoutrefresh;
857 	else
858 		touch = wrefresh;
859 
860 	if (in_minibuffer) {
861 		if (side_window)
862 			touch(help);
863 		touch(body);
864 		touch(echoarea);
865 	} else if (in_side_window) {
866 		touch(body);
867 		touch(echoarea);
868 		touch(help);
869 	} else {
870 		if (side_window)
871 			touch(help);
872 		touch(echoarea);
873 		touch(body);
874 	}
875 }
876 
877 static void
878 redraw_tab(struct tab *tab)
879 {
880 	if (too_small)
881 		return;
882 
883 	if (side_window) {
884 		redraw_help();
885 		wnoutrefresh(help);
886 	}
887 
888 	redraw_tabline();
889 	redraw_body(tab);
890 	redraw_modeline(tab);
891 	redraw_minibuffer();
892 
893 	wnoutrefresh(tabline);
894 	wnoutrefresh(modeline);
895 
896 	if (in_minibuffer == MB_COMPREAD)
897 		wnoutrefresh(minibuffer);
898 
899 	place_cursor(1);
900 
901 	doupdate();
902 
903 	if (set_title)
904 		dprintf(1, "\033]0;%s - Telescope\a",
905 		    current_tab->buffer.page.title);
906 }
907 
908 void
909 start_loading_anim(struct tab *tab)
910 {
911 	if (tab->loading_anim)
912 		return;
913 	tab->loading_anim = 1;
914 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
915 	evtimer_add(&tab->loadingev, &loadingev_timer);
916 }
917 
918 static void
919 update_loading_anim(int fd, short ev, void *d)
920 {
921 	struct tab	*tab = d;
922 
923 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
924 
925 	if (tab == current_tab) {
926 		redraw_modeline(tab);
927 		wrefresh(modeline);
928 		wrefresh(body);
929 		if (in_minibuffer)
930 			wrefresh(echoarea);
931 	}
932 
933 	evtimer_add(&tab->loadingev, &loadingev_timer);
934 }
935 
936 static void
937 stop_loading_anim(struct tab *tab)
938 {
939 	if (!tab->loading_anim)
940 		return;
941 	evtimer_del(&tab->loadingev);
942 	tab->loading_anim = 0;
943 	tab->loading_anim_step = 0;
944 
945 	if (tab != current_tab)
946 		return;
947 
948 	redraw_modeline(tab);
949 
950 	wrefresh(modeline);
951 	wrefresh(body);
952 	if (in_minibuffer)
953 		wrefresh(echoarea);
954 }
955 
956 void
957 load_url_in_tab(struct tab *tab, const char *url, const char *base, int nohist)
958 {
959 	if (!operating) {
960 		load_url(tab, url, base, nohist);
961 		return;
962 	}
963 
964 	autosave_hook();
965 
966 	message("Loading %s...", url);
967 	start_loading_anim(tab);
968 	load_url(tab, url, base, nohist);
969 
970 	redraw_tab(tab);
971 }
972 
973 void
974 switch_to_tab(struct tab *tab)
975 {
976 	current_tab = tab;
977 	tab->flags &= ~TAB_URGENT;
978 
979 	if (operating && tab->flags & TAB_LAZY)
980 		load_url_in_tab(tab, tab->hist_cur->h, NULL, 0);
981 }
982 
983 unsigned int
984 tab_new_id(void)
985 {
986 	return tab_counter++;
987 }
988 
989 struct tab *
990 new_tab(const char *url, const char *base, struct tab *after)
991 {
992 	struct tab	*tab;
993 
994 	autosave_hook();
995 
996 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
997 		event_loopbreak();
998 		return NULL;
999 	}
1000 	tab->fd = -1;
1001 
1002 	TAILQ_INIT(&tab->hist.head);
1003 
1004 	TAILQ_INIT(&tab->buffer.head);
1005 	TAILQ_INIT(&tab->buffer.page.head);
1006 
1007 	tab->id = tab_new_id();
1008 	if (!operating)
1009 		tab->flags |= TAB_LAZY;
1010 	switch_to_tab(tab);
1011 
1012 	if (after != NULL)
1013 		TAILQ_INSERT_AFTER(&tabshead, after, tab, tabs);
1014 	else
1015 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1016 
1017 	load_url_in_tab(tab, url, base, 0);
1018 	return tab;
1019 }
1020 
1021 int
1022 ui_print_colors(void)
1023 {
1024 	int colors = 0, pairs = 0, can_change = 0;
1025 	int columns = 16, lines, color, i, j;
1026 
1027 	initscr();
1028 	if (has_colors()) {
1029 		start_color();
1030 		use_default_colors();
1031 
1032 		colors = COLORS;
1033 		pairs = COLOR_PAIRS;
1034 		can_change = can_change_color();
1035 	}
1036 	endwin();
1037 
1038 	printf("Term info:\n");
1039 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1040 	    getenv("TERM"), colors, pairs, can_change);
1041 	printf("\n");
1042 
1043 	if (colors == 0) {
1044 		printf("No color support\n");
1045 		return 0;
1046 	}
1047 
1048 	printf("Available colors:\n\n");
1049 	lines = (colors - 1) / columns + 1;
1050 	color = 0;
1051 	for (i = 0; i < lines; ++i) {
1052 		for (j = 0; j < columns; ++j, ++color) {
1053 			printf("\033[0;38;5;%dm %03d", color, color);
1054 		}
1055 		printf("\n");
1056 	}
1057 
1058 	printf("\033[0m");
1059 	fflush(stdout);
1060 	return 0;
1061 }
1062 
1063 int
1064 ui_init()
1065 {
1066 	setlocale(LC_ALL, "");
1067 
1068 	if (TAILQ_EMPTY(&global_map.m)) {
1069 		fprintf(stderr, "no keys defined!\n");
1070 		return 0;
1071 	}
1072 
1073 	minibuffer_init();
1074 
1075 	/* initialize help window */
1076 	TAILQ_INIT(&helpwin.head);
1077 	TAILQ_INIT(&helpwin.page.head);
1078 
1079 	base_map = &global_map;
1080 	current_map = &global_map;
1081 
1082 	initscr();
1083 
1084 	if (enable_colors) {
1085 		if (has_colors()) {
1086 			start_color();
1087 			use_default_colors();
1088 		} else
1089 			enable_colors = 0;
1090 	}
1091 
1092 	config_apply_style();
1093 
1094 	raw();
1095 	noecho();
1096 	nonl();
1097 	intrflush(stdscr, FALSE);
1098 
1099 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1100 		return 0;
1101 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1102 		return 0;
1103 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1104 		return 0;
1105 	if ((echoarea = newwin(1, COLS, LINES-1, 0)) == NULL)
1106 		return 0;
1107 	if ((minibuffer = newwin(1, COLS, LINES-1, 0)) == NULL)
1108 		return 0;
1109 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1110 		return 0;
1111 
1112 	body_lines = LINES-3;
1113 	body_cols = COLS;
1114 
1115 	wbkgd(body, body_face.body);
1116 	wbkgd(echoarea, minibuffer_face.background);
1117 
1118 	update_x_offset();
1119 
1120 	keypad(body, TRUE);
1121 	scrollok(body, FALSE);
1122 
1123 	/* non-blocking input */
1124 	wtimeout(body, 0);
1125 	wtimeout(help, 0);
1126 
1127 	mvwprintw(body, 0, 0, "");
1128 
1129 	evtimer_set(&resizeev, handle_resize, NULL);
1130 
1131 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1132 	event_add(&stdioev, NULL);
1133 
1134 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1135 	signal_add(&winchev, NULL);
1136 
1137 	return 1;
1138 }
1139 
1140 void
1141 ui_main_loop(void)
1142 {
1143 	operating = 1;
1144 	switch_to_tab(current_tab);
1145 	redraw_tab(current_tab);
1146 
1147 	event_dispatch();
1148 }
1149 
1150 void
1151 ui_on_tab_loaded(struct tab *tab)
1152 {
1153 	stop_loading_anim(tab);
1154 	message("Loaded %s", tab->hist_cur->h);
1155 
1156 	redraw_tabline();
1157 	wrefresh(tabline);
1158 	place_cursor(0);
1159 }
1160 
1161 void
1162 ui_on_tab_refresh(struct tab *tab)
1163 {
1164 	wrap_page(&tab->buffer, body_cols);
1165 	if (tab == current_tab)
1166 		redraw_tab(tab);
1167 	else
1168 		tab->flags |= TAB_URGENT;
1169 }
1170 
1171 const char *
1172 ui_keyname(int k)
1173 {
1174 	return keyname(k);
1175 }
1176 
1177 void
1178 ui_toggle_side_window(void)
1179 {
1180 	side_window = !side_window;
1181 	if (side_window)
1182 		recompute_help();
1183 	else
1184 		in_side_window = 0;
1185 
1186 	/*
1187 	 * ugly hack, but otherwise the window doesn't get updated
1188 	 * until I call rearrange_windows a second time (e.g. via
1189 	 * C-l).  I will be happy to know why something like this is
1190 	 * needed.
1191 	 */
1192 	rearrange_windows();
1193 	rearrange_windows();
1194 }
1195 
1196 void
1197 ui_schedule_redraw(void)
1198 {
1199 	should_rearrange_windows = 1;
1200 }
1201 
1202 void
1203 ui_require_input(struct tab *tab, int hide, int proto)
1204 {
1205 	void (*fn)(void);
1206 
1207 	if (proto == PROTO_GEMINI)
1208 		fn = ir_select_gemini;
1209 	else if (proto == PROTO_GOPHER)
1210 		fn = ir_select_gopher;
1211 	else
1212 		abort();
1213 
1214 	/* TODO: hard-switching to another tab is ugly */
1215 	switch_to_tab(tab);
1216 
1217 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1218 	    &ir_history, NULL, NULL);
1219 	strlcpy(ministate.prompt, "Input required: ",
1220 	    sizeof(ministate.prompt));
1221 	redraw_tab(tab);
1222 }
1223 
1224 void
1225 ui_after_message_hook(void)
1226 {
1227 	redraw_minibuffer();
1228 	place_cursor(0);
1229 }
1230 
1231 void
1232 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1233     struct tab *data)
1234 {
1235 	yornp(prompt, fn, data);
1236 	redraw_tab(current_tab);
1237 }
1238 
1239 void
1240 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1241     struct tab *data)
1242 {
1243 	minibuffer_read(prompt, fn, data);
1244 	redraw_tab(current_tab);
1245 }
1246 
1247 void
1248 ui_other_window(void)
1249 {
1250 	if (side_window)
1251 		in_side_window = !in_side_window;
1252 	else
1253 		message("No other window to select");
1254 }
1255 
1256 void
1257 ui_suspend(void)
1258 {
1259 	endwin();
1260 
1261 	kill(getpid(), SIGSTOP);
1262 
1263 	refresh();
1264 	clear();
1265 	rearrange_windows();
1266 }
1267 
1268 void
1269 ui_end(void)
1270 {
1271 	endwin();
1272 }