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Date:: Sat Aug 14 19:59:12 2021 UTC
Message:: simplify condition
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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, vl->parent->data);
167 	else {
168 		prfx = line_prefixes[vl->parent->type].prfx1;
169 		buffer->curs_x += utf8_swidth(prfx);
170 	}
171 }
172 
173 void
174 global_key_unbound(void)
175 {
176 	message("%s is undefined", keybuf);
177 }
178 
179 struct buffer *
180 current_buffer(void)
181 {
182 	if (in_minibuffer)
183 		return &ministate.buffer;
184 	if (in_side_window)
185 		return &helpwin;
186 	return &current_tab->buffer;
187 }
188 
189 static int
190 readkey(void)
191 {
192 	uint32_t state = 0;
193 
194 	if ((thiskey.key = wgetch(body)) == ERR)
195 		return 0;
196 
197 	thiskey.meta = thiskey.key == 27;
198 	if (thiskey.meta) {
199 		thiskey.key = wgetch(body);
200 		if (thiskey.key == ERR || thiskey.key == 27) {
201 			thiskey.meta = 0;
202 			thiskey.key = 27;
203 		}
204 	}
205 
206 	thiskey.cp = 0;
207 
208 	if ((unsigned int)thiskey.key >= UINT8_MAX)
209 		return 1;
210 
211 	while (1) {
212 		if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
213 			break;
214 		if ((thiskey.key = wgetch(body)) == ERR) {
215 			message("Error decoding user input");
216 			return 0;
217 		}
218 	}
219 
220 	return 1;
221 }
222 
223 static void
224 dispatch_stdio(int fd, short ev, void *d)
225 {
226 	struct keymap	*k;
227 	const char	*keyname;
228 	char		 tmp[5] = {0};
229 
230 	/* TODO: schedule a redraw? */
231 	if (too_small)
232 		return;
233 
234 	if (!readkey())
235 		return;
236 
237 	if (keybuf[0] != '\0')
238 		strlcat(keybuf, " ", sizeof(keybuf));
239 	if (thiskey.meta)
240 		strlcat(keybuf, "M-", sizeof(keybuf));
241 	if (thiskey.cp != 0) {
242 		utf8_encode(thiskey.cp, tmp);
243 		strlcat(keybuf, tmp, sizeof(keybuf));
244 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
245 		strlcat(keybuf, keyname, sizeof(keybuf));
246 	} else {
247 		tmp[0] = thiskey.key;
248 		strlcat(keybuf, tmp, sizeof(keybuf));
249 	}
250 
251 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
252 		if (k->meta == thiskey.meta &&
253 		    k->key == thiskey.key) {
254 			if (k->fn == NULL)
255 				current_map = &k->map;
256 			else {
257 				current_map = base_map;
258 				strlcpy(keybuf, "", sizeof(keybuf));
259 				k->fn(current_buffer());
260 			}
261 			goto done;
262 		}
263 	}
264 
265 	if (current_map->unhandled_input != NULL)
266 		current_map->unhandled_input();
267 	else
268 		global_key_unbound();
269 
270 	strlcpy(keybuf, "", sizeof(keybuf));
271 	current_map = base_map;
272 
273 done:
274 	if (side_window)
275 		recompute_help();
276 
277 	if (should_rearrange_windows)
278 		rearrange_windows();
279 	redraw_tab(current_tab);
280 }
281 
282 static void
283 handle_resize(int sig, short ev, void *d)
284 {
285 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
286 		event_del(&resizeev);
287 	}
288 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
289 	evtimer_add(&resizeev, &resize_timer);
290 }
291 
292 static void
293 handle_resize_nodelay(int s, short ev, void *d)
294 {
295 	endwin();
296 	refresh();
297 	clear();
298 
299 	rearrange_windows();
300 }
301 
302 static void
303 rearrange_windows(void)
304 {
305 	int		 lines;
306 
307 	should_rearrange_windows = 0;
308 
309 	lines = LINES;
310 
311 	if ((too_small = lines < 15)) {
312 		erase();
313 		printw("Window too small.");
314 		refresh();
315 		return;
316 	}
317 
318 	/* move and resize the windows, in reverse order! */
319 
320 	if (in_minibuffer == MB_COMPREAD) {
321 		mvwin(minibuffer, lines-10, 0);
322 		wresize(minibuffer, 10, COLS);
323 		lines -= 10;
324 
325 		wrap_page(&ministate.compl.buffer, COLS);
326 	}
327 
328 	mvwin(echoarea, --lines, 0);
329 	wresize(echoarea, 1, COLS);
330 
331 	mvwin(modeline, --lines, 0);
332 	wresize(modeline, 1, COLS);
333 
334 	body_lines = --lines;
335 	body_cols = COLS;
336 
337 	if (side_window) {
338 		help_cols = 0.3 * COLS;
339 		help_lines = lines;
340 		mvwin(help, 1, 0);
341 		wresize(help, help_lines, help_cols);
342 
343 		wrap_page(&helpwin, help_cols);
344 
345 		body_cols = COLS - help_cols - 1;
346 		mvwin(body, 1, help_cols);
347 	} else
348 		mvwin(body, 1, 0);
349 
350 	update_x_offset();
351 	wresize(body, body_lines, body_cols);
352 
353 	wresize(tabline, 1, COLS);
354 
355 	wrap_page(&current_tab->buffer, body_cols);
356 	redraw_tab(current_tab);
357 }
358 
359 static void
360 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
361     const char **prfx_ret, const char **text_ret)
362 {
363 	int type, i, cont, width;
364 	char *space, *t;
365 
366 	if ((*text_ret = vl->line) == NULL)
367 		*text_ret = "";
368 
369 	cont = vl->flags & L_CONTINUATION;
370 	type = vl->parent->type;
371 	if (!cont)
372 		*prfx_ret = line_prefixes[type].prfx1;
373 	else
374 		*prfx_ret = line_prefixes[type].prfx2;
375 
376 	space = vl->parent->data;
377 	if (!emojify_link || type != LINE_LINK || space == NULL)
378 		return;
379 
380 	if (cont) {
381 		memset(buf, 0, len);
382 		width = utf8_swidth_between(vl->parent->line, space);
383 		for (i = 0; i < width + 1; ++i)
384 			strlcat(buf, " ", len);
385 	} else {
386 		strlcpy(buf, *text_ret, len);
387 		if ((t = strchr(buf, ' ')) != NULL)
388 			*t = '\0';
389 		strlcat(buf, " ", len);
390 
391 		/* skip the emoji */
392                 *text_ret += (space - vl->parent->line) + 1;
393 	}
394 
395 	*prfx_ret = buf;
396 }
397 
398 static inline void
399 print_vline_descr(int width, WINDOW *window, struct vline *vl)
400 {
401 	int x, y, goal;
402 
403 	if (vl->parent->type != LINE_COMPL &&
404 	    vl->parent->type != LINE_COMPL_CURRENT &&
405 	    vl->parent->type != LINE_HELP)
406 		return;
407 
408 	if (vl->parent->alt == NULL)
409 		return;
410 
411 	(void)y;
412 	getyx(window, y, x);
413 
414 	if (vl->parent->type == LINE_HELP)
415 		goal = 8;
416 	else
417 		goal = width/2;
418 
419 	if (goal <= x)
420 		wprintw(window, " ");
421 	for (; goal > x; ++x)
422 		wprintw(window, " ");
423 
424 	wprintw(window, "%s", vl->parent->alt);
425 }
426 
427 /*
428  * Core part of the rendering.  It prints a vline starting from the
429  * current cursor position.  Printing a vline consists of skipping
430  * `off' columns (for olivetti-mode), print the correct prefix (which
431  * may be the emoji in case of emojified links-lines), printing the
432  * text itself, filling until width - off and filling off columns
433  * again.
434  */
435 static void
436 print_vline(int off, int width, WINDOW *window, struct vline *vl)
437 {
438 	/*
439 	 * Believe me or not, I've seen emoji ten code points long!
440 	 * That means, to stay large, 4*10 bytes + NUL.
441 	 */
442 	char emojibuf[41] = {0};
443 	const char *text, *prfx;
444 	struct line_face *f;
445 	int i, left, x, y;
446 
447 	f = &line_faces[vl->parent->type];
448 
449 	/* unused, set by getyx */
450 	(void)y;
451 
452 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
453 
454 	wattr_on(window, body_face.left, NULL);
455 	for (i = 0; i < off; i++)
456 		waddch(window, ' ');
457 	wattr_off(window, body_face.left, NULL);
458 
459 	wattr_on(window, f->prefix, NULL);
460 	wprintw(window, "%s", prfx);
461 	wattr_off(window, f->prefix, NULL);
462 
463 	wattr_on(window, f->text, NULL);
464 	wprintw(window, "%s", text);
465 	print_vline_descr(width, window, vl);
466 	wattr_off(window, f->text, NULL);
467 
468 	getyx(window, y, x);
469 
470 	left = width - x;
471 
472 	wattr_on(window, f->trail, NULL);
473 	for (i = 0; i < left - off; ++i)
474 		waddch(window, ' ');
475 	wattr_off(window, f->trail, NULL);
476 
477 	wattr_on(window, body_face.right, NULL);
478 	for (i = 0; i < off; i++)
479 		waddch(window, ' ');
480 	wattr_off(window, body_face.right, NULL);
481 
482 }
483 
484 static void
485 redraw_tabline(void)
486 {
487 	struct tab	*tab;
488 	size_t		 toskip, ots, tabwidth, space, x;
489 	int		 current, y, truncated, pair;
490 	const char	*title;
491 	char		 buf[25];
492 
493 	x = 0;
494 
495 	/* unused, but setted by a getyx */
496 	(void)y;
497 
498 	tabwidth = sizeof(buf)+1;
499 	space = COLS-2;
500 
501 	toskip = 0;
502 	TAILQ_FOREACH(tab, &tabshead, tabs) {
503 		toskip++;
504 		if (tab == current_tab)
505 			break;
506 	}
507 
508 	if (toskip * tabwidth < space)
509 		toskip = 0;
510 	else {
511 		ots = toskip;
512 		toskip--;
513                 while (toskip != 0 &&
514 		    (ots - toskip+1) * tabwidth < space)
515 			toskip--;
516 	}
517 
518 	werase(tabline);
519 	wattr_on(tabline, tab_face.background, NULL);
520 	wprintw(tabline, toskip == 0 ? " " : "<");
521 	wattr_off(tabline, tab_face.background, NULL);
522 
523 	truncated = 0;
524 	TAILQ_FOREACH(tab, &tabshead, tabs) {
525 		if (truncated)
526 			break;
527 		if (toskip != 0) {
528 			toskip--;
529 			continue;
530 		}
531 
532 		getyx(tabline, y, x);
533 		if (x + sizeof(buf)+2 >= (size_t)COLS)
534 			truncated = 1;
535 
536 		current = tab == current_tab;
537 
538 		if (*(title = tab->buffer.page.title) == '\0')
539 			title = tab->hist_cur->h;
540 
541 		if (tab->flags & TAB_URGENT)
542 			strlcpy(buf, "!", sizeof(buf));
543 		else
544 			strlcpy(buf, " ", sizeof(buf));
545 
546                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
547 			/* truncation happens */
548 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
549 		} else {
550 			/* pad with spaces */
551 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
552 				/* nop */ ;
553 		}
554 
555 		pair = current ? tab_face.current : tab_face.tab;
556 		wattr_on(tabline, pair, NULL);
557 		wprintw(tabline, "%s", buf);
558 		wattr_off(tabline, pair, NULL);
559 
560 		wattr_on(tabline, tab_face.background, NULL);
561 		if (TAILQ_NEXT(tab, tabs) != NULL)
562 			wprintw(tabline, "┃");
563 		wattr_off(tabline, tab_face.background, NULL);
564 	}
565 
566 	wattr_on(tabline, tab_face.background, NULL);
567 	for (; x < (size_t)COLS; ++x)
568 		waddch(tabline, ' ');
569 	if (truncated)
570 		mvwprintw(tabline, 0, COLS-1, ">");
571 	wattr_off(tabline, tab_face.background, NULL);
572 }
573 
574 /*
575  * Compute the first visible line around vl.  Try to search forward
576  * until the end of the buffer; if a visible line is not found, search
577  * backward.  Return NULL if no viable line was found.
578  */
579 struct vline *
580 adjust_line(struct vline *vl, struct buffer *buffer)
581 {
582 	struct vline *t;
583 
584 	if (vl == NULL)
585 		return NULL;
586 
587 	if (!(vl->parent->flags & L_HIDDEN))
588 		return vl;
589 
590 	/* search forward */
591 	for (t = vl;
592 	     t != NULL && t->parent->flags & L_HIDDEN;
593 	     t = TAILQ_NEXT(t, vlines))
594 		;		/* nop */
595 
596 	if (t != NULL)
597 		return t;
598 
599 	/* search backward */
600 	for (t = vl;
601 	     t != NULL && t->parent->flags & L_HIDDEN;
602 	     t = TAILQ_PREV(t, vhead, vlines))
603 		;		/* nop */
604 
605 	return t;
606 }
607 
608 static void
609 redraw_window(WINDOW *win, int off, int height, int width, struct buffer *buffer)
610 {
611 	struct vline	*vl;
612 	int		 l, onscreen;
613 
614 	restore_curs_x(buffer);
615 
616 	/*
617 	 * TODO: ignoring buffer->force_update and always
618 	 * re-rendering.  In theory we can recompute the y position
619 	 * without a re-render, and optimize here.  It's not the only
620 	 * optimisation possible here, wscrl wolud also be an
621 	 * interesting one.
622 	 */
623 
624 again:
625 	werase(win);
626 	buffer->curs_y = 0;
627 
628 	if (TAILQ_EMPTY(&buffer->head))
629 		goto end;
630 
631 	if (buffer->top_line == NULL)
632 		buffer->top_line = TAILQ_FIRST(&buffer->head);
633 
634 	buffer->top_line = adjust_line(buffer->top_line, buffer);
635 	if (buffer->top_line == NULL)
636 		goto end;
637 
638 	buffer->current_line = adjust_line(buffer->current_line, buffer);
639 
640 	l = 0;
641 	onscreen = 0;
642 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
643 		if (vl->parent->flags & L_HIDDEN)
644 			continue;
645 
646 		wmove(win, l, 0);
647 		print_vline(off, width, win, vl);
648 
649 		if (vl == buffer->current_line)
650 			onscreen = 1;
651 
652 		if (!onscreen)
653 			buffer->curs_y++;
654 
655 		l++;
656 		if (l == height)
657 			break;
658 	}
659 
660 	if (!onscreen) {
661 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
662 			if (vl == buffer->current_line)
663 				break;
664 			if (vl->parent->flags & L_HIDDEN)
665 				continue;
666 			buffer->line_off++;
667 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
668 		}
669 
670 		if (vl != NULL)
671 			goto again;
672 	}
673 
674 	buffer->last_line_off = buffer->line_off;
675 	buffer->force_redraw = 0;
676 end:
677 	wmove(win, buffer->curs_y, buffer->curs_x);
678 }
679 
680 static void
681 redraw_help(void)
682 {
683 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
684 }
685 
686 static void
687 redraw_body(struct tab *tab)
688 {
689 	static struct tab *last_tab;
690 
691 	if (last_tab != tab)
692 		tab->buffer.force_redraw =1;
693 	last_tab = tab;
694 
695 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
696 }
697 
698 static inline char
699 trust_status_char(enum trust_state ts)
700 {
701 	switch (ts) {
702 	case TS_UNKNOWN:	return '-';
703 	case TS_UNTRUSTED:	return '!';
704 	case TS_TEMP_TRUSTED:	return '!';
705 	case TS_TRUSTED:	return 'v';
706 	case TS_VERIFIED:	return 'V';
707 	default:		return 'X';
708 	}
709 }
710 
711 static void
712 redraw_modeline(struct tab *tab)
713 {
714 	struct buffer	*buffer;
715 	double		 pct;
716 	int		 x, y, max_x, max_y;
717 	const char	*mode;
718 	const char	*spin = "-\\|/";
719 
720 	buffer = current_buffer();
721 	mode = buffer->page.name;
722 
723 	werase(modeline);
724 	wattr_on(modeline, modeline_face.background, NULL);
725 	wmove(modeline, 0, 0);
726 
727 	wprintw(modeline, "-%c%c %s ",
728 	    spin[tab->loading_anim_step],
729 	    trust_status_char(tab->trust),
730 	    mode == NULL ? "(none)" : mode);
731 
732 	pct = (buffer->line_off + buffer->curs_y) * 100.0
733 		/ buffer->line_max;
734 
735 	if (buffer->line_max <= (size_t)body_lines)
736                 wprintw(modeline, "All ");
737 	else if (buffer->line_off == 0)
738                 wprintw(modeline, "Top ");
739 	else if (buffer->line_off + body_lines >= buffer->line_max)
740 		wprintw(modeline, "Bottom ");
741 	else
742 		wprintw(modeline, "%.0f%% ", pct);
743 
744 	wprintw(modeline, "%d/%d %s ",
745 	    buffer->line_off + buffer->curs_y,
746 	    buffer->line_max,
747 	    tab->hist_cur->h);
748 
749 	getyx(modeline, y, x);
750 	getmaxyx(modeline, max_y, max_x);
751 
752 	(void)y;
753 	(void)max_y;
754 
755 	for (; x < max_x; ++x)
756 		waddstr(modeline, "-");
757 
758 	wattr_off(modeline, modeline_face.background, NULL);
759 }
760 
761 static void
762 redraw_minibuffer(void)
763 {
764 	wattr_on(echoarea, minibuffer_face.background, NULL);
765 	werase(echoarea);
766 
767 	if (in_minibuffer)
768 		do_redraw_minibuffer();
769 	else
770 		do_redraw_echoarea();
771 
772 	if (in_minibuffer == MB_COMPREAD)
773 		do_redraw_minibuffer_compl();
774 
775 	wattr_off(echoarea, minibuffer_face.background, NULL);
776 }
777 
778 static void
779 do_redraw_echoarea(void)
780 {
781 	struct vline *vl;
782 
783 	if (ministate.curmesg != NULL)
784                 wprintw(echoarea, "%s", ministate.curmesg);
785 	else if (*keybuf != '\0')
786 		waddstr(echoarea, keybuf);
787 	else {
788 		/* If nothing else, show the URL at point */
789 		vl = current_tab->buffer.current_line;
790 		if (vl != NULL && vl->parent->type == LINE_LINK)
791 			waddstr(echoarea, vl->parent->alt);
792 	}
793 }
794 
795 static void
796 do_redraw_minibuffer(void)
797 {
798 	struct buffer	*cmplbuf, *buffer;
799 	size_t		 off_y, off_x = 0;
800 	const char	*start, *c;
801 
802 	cmplbuf = &ministate.compl.buffer;
803 	buffer = &ministate.buffer;
804 	(void)off_y;		/* unused, set by getyx */
805 
806 	wmove(echoarea, 0, 0);
807 
808 	if (in_minibuffer == MB_COMPREAD)
809 		wprintw(echoarea, "(%2d) ",
810 		    cmplbuf->line_max);
811 
812 	wprintw(echoarea, "%s", ministate.prompt);
813 	if (ministate.hist_cur != NULL)
814 		wprintw(echoarea, "(%zu/%zu) ",
815 		    ministate.hist_off + 1,
816 		    ministate.history->len);
817 
818 	getyx(echoarea, off_y, off_x);
819 
820 	start = ministate.hist_cur != NULL
821 		? ministate.hist_cur->h
822 		: ministate.buf;
823 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
824 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
825 		start = utf8_next_cp(start);
826 	}
827 
828 	waddstr(echoarea, start);
829 
830 	if (ministate.curmesg != NULL)
831 		wprintw(echoarea, " [%s]", ministate.curmesg);
832 
833 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
834 }
835 
836 static void
837 do_redraw_minibuffer_compl(void)
838 {
839 	redraw_window(minibuffer, 0, 10, COLS,
840 	    &ministate.compl.buffer);
841 }
842 
843 /*
844  * Place the cursor in the right ncurses window.  If soft is 1, use
845  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
846  * wrefresh.
847  */
848 static void
849 place_cursor(int soft)
850 {
851 	int (*touch)(WINDOW *);
852 
853 	if (soft)
854 		touch = wnoutrefresh;
855 	else
856 		touch = wrefresh;
857 
858 	if (in_minibuffer) {
859 		if (side_window)
860 			touch(help);
861 		touch(body);
862 		touch(echoarea);
863 	} else if (in_side_window) {
864 		touch(body);
865 		touch(echoarea);
866 		touch(help);
867 	} else {
868 		if (side_window)
869 			touch(help);
870 		touch(echoarea);
871 		touch(body);
872 	}
873 }
874 
875 static void
876 redraw_tab(struct tab *tab)
877 {
878 	if (too_small)
879 		return;
880 
881 	if (side_window) {
882 		redraw_help();
883 		wnoutrefresh(help);
884 	}
885 
886 	redraw_tabline();
887 	redraw_body(tab);
888 	redraw_modeline(tab);
889 	redraw_minibuffer();
890 
891 	wnoutrefresh(tabline);
892 	wnoutrefresh(modeline);
893 
894 	if (in_minibuffer == MB_COMPREAD)
895 		wnoutrefresh(minibuffer);
896 
897 	place_cursor(1);
898 
899 	doupdate();
900 
901 	if (set_title)
902 		dprintf(1, "\033]0;%s - Telescope\a",
903 		    current_tab->buffer.page.title);
904 }
905 
906 void
907 start_loading_anim(struct tab *tab)
908 {
909 	if (tab->loading_anim)
910 		return;
911 	tab->loading_anim = 1;
912 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
913 	evtimer_add(&tab->loadingev, &loadingev_timer);
914 }
915 
916 static void
917 update_loading_anim(int fd, short ev, void *d)
918 {
919 	struct tab	*tab = d;
920 
921 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
922 
923 	if (tab == current_tab) {
924 		redraw_modeline(tab);
925 		wrefresh(modeline);
926 		wrefresh(body);
927 		if (in_minibuffer)
928 			wrefresh(echoarea);
929 	}
930 
931 	evtimer_add(&tab->loadingev, &loadingev_timer);
932 }
933 
934 static void
935 stop_loading_anim(struct tab *tab)
936 {
937 	if (!tab->loading_anim)
938 		return;
939 	evtimer_del(&tab->loadingev);
940 	tab->loading_anim = 0;
941 	tab->loading_anim_step = 0;
942 
943 	if (tab != current_tab)
944 		return;
945 
946 	redraw_modeline(tab);
947 
948 	wrefresh(modeline);
949 	wrefresh(body);
950 	if (in_minibuffer)
951 		wrefresh(echoarea);
952 }
953 
954 void
955 load_url_in_tab(struct tab *tab, const char *url, const char *base, int nohist)
956 {
957 	if (!operating) {
958 		load_url(tab, url, base, nohist);
959 		return;
960 	}
961 
962 	autosave_hook();
963 
964 	message("Loading %s...", url);
965 	start_loading_anim(tab);
966 	load_url(tab, url, base, nohist);
967 
968 	redraw_tab(tab);
969 }
970 
971 void
972 switch_to_tab(struct tab *tab)
973 {
974 	current_tab = tab;
975 	tab->flags &= ~TAB_URGENT;
976 
977 	if (operating && tab->flags & TAB_LAZY)
978 		load_url_in_tab(tab, tab->hist_cur->h, NULL, 0);
979 }
980 
981 unsigned int
982 tab_new_id(void)
983 {
984 	return tab_counter++;
985 }
986 
987 struct tab *
988 new_tab(const char *url, const char *base, struct tab *after)
989 {
990 	struct tab	*tab;
991 
992 	autosave_hook();
993 
994 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
995 		event_loopbreak();
996 		return NULL;
997 	}
998 	tab->fd = -1;
999 
1000 	TAILQ_INIT(&tab->hist.head);
1001 
1002 	TAILQ_INIT(&tab->buffer.head);
1003 	TAILQ_INIT(&tab->buffer.page.head);
1004 
1005 	tab->id = tab_new_id();
1006 	if (!operating)
1007 		tab->flags |= TAB_LAZY;
1008 	switch_to_tab(tab);
1009 
1010 	if (after != NULL)
1011 		TAILQ_INSERT_AFTER(&tabshead, after, tab, tabs);
1012 	else
1013 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1014 
1015 	load_url_in_tab(tab, url, base, 0);
1016 	return tab;
1017 }
1018 
1019 int
1020 ui_print_colors(void)
1021 {
1022 	int colors = 0, pairs = 0, can_change = 0;
1023 	int columns = 16, lines, color, i, j;
1024 
1025 	initscr();
1026 	if (has_colors()) {
1027 		start_color();
1028 		use_default_colors();
1029 
1030 		colors = COLORS;
1031 		pairs = COLOR_PAIRS;
1032 		can_change = can_change_color();
1033 	}
1034 	endwin();
1035 
1036 	printf("Term info:\n");
1037 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1038 	    getenv("TERM"), colors, pairs, can_change);
1039 	printf("\n");
1040 
1041 	if (colors == 0) {
1042 		printf("No color support\n");
1043 		return 0;
1044 	}
1045 
1046 	printf("Available colors:\n\n");
1047 	lines = (colors - 1) / columns + 1;
1048 	color = 0;
1049 	for (i = 0; i < lines; ++i) {
1050 		for (j = 0; j < columns; ++j, ++color) {
1051 			printf("\033[0;38;5;%dm %03d", color, color);
1052 		}
1053 		printf("\n");
1054 	}
1055 
1056 	printf("\033[0m");
1057 	fflush(stdout);
1058 	return 0;
1059 }
1060 
1061 int
1062 ui_init()
1063 {
1064 	setlocale(LC_ALL, "");
1065 
1066 	if (TAILQ_EMPTY(&global_map.m)) {
1067 		fprintf(stderr, "no keys defined!\n");
1068 		return 0;
1069 	}
1070 
1071 	minibuffer_init();
1072 
1073 	/* initialize help window */
1074 	TAILQ_INIT(&helpwin.head);
1075 	TAILQ_INIT(&helpwin.page.head);
1076 
1077 	base_map = &global_map;
1078 	current_map = &global_map;
1079 
1080 	initscr();
1081 
1082 	if (enable_colors) {
1083 		if (has_colors()) {
1084 			start_color();
1085 			use_default_colors();
1086 		} else
1087 			enable_colors = 0;
1088 	}
1089 
1090 	config_apply_style();
1091 
1092 	raw();
1093 	noecho();
1094 	nonl();
1095 	intrflush(stdscr, FALSE);
1096 
1097 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1098 		return 0;
1099 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1100 		return 0;
1101 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1102 		return 0;
1103 	if ((echoarea = newwin(1, COLS, LINES-1, 0)) == NULL)
1104 		return 0;
1105 	if ((minibuffer = newwin(1, COLS, LINES-1, 0)) == NULL)
1106 		return 0;
1107 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1108 		return 0;
1109 
1110 	body_lines = LINES-3;
1111 	body_cols = COLS;
1112 
1113 	wbkgd(body, body_face.body);
1114 	wbkgd(echoarea, minibuffer_face.background);
1115 
1116 	update_x_offset();
1117 
1118 	keypad(body, TRUE);
1119 	scrollok(body, FALSE);
1120 
1121 	/* non-blocking input */
1122 	wtimeout(body, 0);
1123 	wtimeout(help, 0);
1124 
1125 	mvwprintw(body, 0, 0, "");
1126 
1127 	evtimer_set(&resizeev, handle_resize, NULL);
1128 
1129 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1130 	event_add(&stdioev, NULL);
1131 
1132 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1133 	signal_add(&winchev, NULL);
1134 
1135 	return 1;
1136 }
1137 
1138 void
1139 ui_main_loop(void)
1140 {
1141 	operating = 1;
1142 	switch_to_tab(current_tab);
1143 	redraw_tab(current_tab);
1144 
1145 	event_dispatch();
1146 }
1147 
1148 void
1149 ui_on_tab_loaded(struct tab *tab)
1150 {
1151 	stop_loading_anim(tab);
1152 	message("Loaded %s", tab->hist_cur->h);
1153 
1154 	redraw_tabline();
1155 	wrefresh(tabline);
1156 	place_cursor(0);
1157 }
1158 
1159 void
1160 ui_on_tab_refresh(struct tab *tab)
1161 {
1162 	wrap_page(&tab->buffer, body_cols);
1163 	if (tab == current_tab)
1164 		redraw_tab(tab);
1165 	else
1166 		tab->flags |= TAB_URGENT;
1167 }
1168 
1169 const char *
1170 ui_keyname(int k)
1171 {
1172 	return keyname(k);
1173 }
1174 
1175 void
1176 ui_toggle_side_window(void)
1177 {
1178 	side_window = !side_window;
1179 	if (side_window)
1180 		recompute_help();
1181 	else
1182 		in_side_window = 0;
1183 
1184 	/*
1185 	 * ugly hack, but otherwise the window doesn't get updated
1186 	 * until I call rearrange_windows a second time (e.g. via
1187 	 * C-l).  I will be happy to know why something like this is
1188 	 * needed.
1189 	 */
1190 	rearrange_windows();
1191 	rearrange_windows();
1192 }
1193 
1194 void
1195 ui_schedule_redraw(void)
1196 {
1197 	should_rearrange_windows = 1;
1198 }
1199 
1200 void
1201 ui_require_input(struct tab *tab, int hide, int proto)
1202 {
1203 	void (*fn)(void);
1204 
1205 	if (proto == PROTO_GEMINI)
1206 		fn = ir_select_gemini;
1207 	else if (proto == PROTO_GOPHER)
1208 		fn = ir_select_gopher;
1209 	else
1210 		abort();
1211 
1212 	/* TODO: hard-switching to another tab is ugly */
1213 	switch_to_tab(tab);
1214 
1215 	enter_minibuffer(sensible_self_insert, fn, exit_minibuffer,
1216 	    &ir_history, NULL, NULL);
1217 	strlcpy(ministate.prompt, "Input required: ",
1218 	    sizeof(ministate.prompt));
1219 	redraw_tab(tab);
1220 }
1221 
1222 void
1223 ui_after_message_hook(void)
1224 {
1225 	redraw_minibuffer();
1226 	place_cursor(0);
1227 }
1228 
1229 void
1230 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1231     struct tab *data)
1232 {
1233 	yornp(prompt, fn, data);
1234 	redraw_tab(current_tab);
1235 }
1236 
1237 void
1238 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1239     struct tab *data)
1240 {
1241 	minibuffer_read(prompt, fn, data);
1242 	redraw_tab(current_tab);
1243 }
1244 
1245 void
1246 ui_other_window(void)
1247 {
1248 	if (side_window)
1249 		in_side_window = !in_side_window;
1250 	else
1251 		message("No other window to select");
1252 }
1253 
1254 void
1255 ui_suspend(void)
1256 {
1257 	endwin();
1258 
1259 	kill(getpid(), SIGSTOP);
1260 
1261 	refresh();
1262 	clear();
1263 	rearrange_windows();
1264 }
1265 
1266 void
1267 ui_end(void)
1268 {
1269 	endwin();
1270 }