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Date:: Wed Jul 21 15:33:39 2021 UTC
Message:: fix redraw when side window is visible
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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 <event.h>
38 #include <locale.h>
39 #include <signal.h>
40 #include <stdarg.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44 
45 #include "defaults.h"
46 #include "minibuffer.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_help(void);
65 static void		 redraw_body(struct tab*);
66 static void		 redraw_modeline(struct tab*);
67 static void		 redraw_minibuffer(void);
68 static void		 do_redraw_echoarea(void);
69 static void		 do_redraw_minibuffer(void);
70 static void		 do_redraw_minibuffer_compl(void);
71 static void		 place_cursor(int);
72 static void		 redraw_tab(struct tab*);
73 static void		 update_loading_anim(int, short, void*);
74 static void		 stop_loading_anim(struct tab*);
75 
76 /*
77  * Used to know when we're finished loading.
78  */
79 static int		 operating;
80 
81 static int		 should_rearrange_windows;
82 static int		 too_small;
83 static int		 x_offset;
84 
85 struct thiskey	 thiskey;
86 struct tab	*current_tab;
87 
88 static struct event	resizeev;
89 static struct timeval	resize_timer = { 0, 250000 };
90 
91 static WINDOW	*tabline, *body, *modeline, *echoarea, *minibuffer;
92 
93 int			 body_lines, body_cols;
94 
95 static WINDOW		*help;
96 /* not static so we can see them from help.c */
97 struct buffer		 helpwin;
98 int			 help_lines, help_cols;
99 
100 static int		 side_window;
101 static int		 in_side_window;
102 
103 static struct timeval	loadingev_timer = { 0, 250000 };
104 
105 static uint32_t		 tab_counter;
106 
107 static char	keybuf[64];
108 
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 	if ((unsigned int)thiskey.key < UINT8_MAX) {
208 		while (1) {
209 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
210 				break;
211 			if ((thiskey.key = wgetch(body)) == ERR) {
212 				message("Error decoding user input");
213 				return 0;
214 			}
215 		}
216 	}
217 
218 	return 1;
219 }
220 
221 static void
222 dispatch_stdio(int fd, short ev, void *d)
223 {
224 	struct keymap	*k;
225 	const char	*keyname;
226 	char		 tmp[5] = {0};
227 
228 	/* TODO: schedule a redraw? */
229 	if (too_small)
230 		return;
231 
232 	if (!readkey())
233 		return;
234 
235 	if (keybuf[0] != '\0')
236 		strlcat(keybuf, " ", sizeof(keybuf));
237 	if (thiskey.meta)
238 		strlcat(keybuf, "M-", sizeof(keybuf));
239 	if (thiskey.cp != 0) {
240 		utf8_encode(thiskey.cp, tmp);
241 		strlcat(keybuf, tmp, sizeof(keybuf));
242 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
243 		strlcat(keybuf, keyname, sizeof(keybuf));
244 	} else {
245 		tmp[0] = thiskey.key;
246 		strlcat(keybuf, tmp, sizeof(keybuf));
247 	}
248 
249 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
250 		if (k->meta == thiskey.meta &&
251 		    k->key == thiskey.key) {
252 			if (k->fn == NULL)
253 				current_map = &k->map;
254 			else {
255 				current_map = base_map;
256 				strlcpy(keybuf, "", sizeof(keybuf));
257 				k->fn(current_buffer());
258 			}
259 			goto done;
260 		}
261 	}
262 
263 	if (current_map->unhandled_input != NULL)
264 		current_map->unhandled_input();
265 	else
266 		global_key_unbound();
267 
268 	strlcpy(keybuf, "", sizeof(keybuf));
269 	current_map = base_map;
270 
271 done:
272 	if (side_window)
273 		recompute_help();
274 
275 	if (should_rearrange_windows)
276 		rearrange_windows();
277 	redraw_tab(current_tab);
278 }
279 
280 static void
281 handle_resize(int sig, short ev, void *d)
282 {
283 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
284 		event_del(&resizeev);
285 	}
286 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
287 	evtimer_add(&resizeev, &resize_timer);
288 }
289 
290 static void
291 handle_resize_nodelay(int s, short ev, void *d)
292 {
293 	endwin();
294 	refresh();
295 	clear();
296 
297 	rearrange_windows();
298 }
299 
300 static void
301 rearrange_windows(void)
302 {
303 	int		 lines;
304 
305 	should_rearrange_windows = 0;
306 
307 	lines = LINES;
308 
309 	if ((too_small = lines < 15)) {
310 		erase();
311 		printw("Window too small.");
312 		refresh();
313 		return;
314 	}
315 
316 	/* move and resize the windows, in reverse order! */
317 
318 	if (in_minibuffer == MB_COMPREAD) {
319 		mvwin(minibuffer, lines-10, 0);
320 		wresize(minibuffer, 10, COLS);
321 		lines -= 10;
322 
323 		wrap_page(&ministate.compl.buffer, COLS);
324 	}
325 
326 	mvwin(echoarea, --lines, 0);
327 	wresize(echoarea, 1, COLS);
328 
329 	mvwin(modeline, --lines, 0);
330 	wresize(modeline, 1, COLS);
331 
332 	body_lines = --lines;
333 	body_cols = COLS;
334 
335 	if (side_window) {
336 		help_cols = 0.3 * COLS;
337 		help_lines = lines;
338 		mvwin(help, 1, 0);
339 		wresize(help, help_lines, help_cols);
340 
341 		wrap_page(&helpwin, help_cols);
342 
343 		body_cols = COLS - help_cols - 1;
344 		mvwin(body, 1, help_cols);
345 	} else
346 		mvwin(body, 1, 0);
347 
348 	update_x_offset();
349 	wresize(body, body_lines, body_cols);
350 
351 	wresize(tabline, 1, COLS);
352 
353 	wrap_page(&current_tab->buffer, body_cols);
354 	redraw_tab(current_tab);
355 }
356 
357 static void
358 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
359     const char **prfx_ret, const char **text_ret)
360 {
361 	int type, i, cont, width;
362 	char *space, *t;
363 
364 	if ((*text_ret = vl->line) == NULL)
365 		*text_ret = "";
366 
367 	cont = vl->flags & L_CONTINUATION;
368 	type = vl->parent->type;
369 	if (!cont)
370 		*prfx_ret = line_prefixes[type].prfx1;
371 	else
372 		*prfx_ret = line_prefixes[type].prfx2;
373 
374 	space = vl->parent->data;
375 	if (!emojify_link || type != LINE_LINK || space == NULL)
376 		return;
377 
378 	if (cont) {
379 		memset(buf, 0, len);
380 		width = utf8_swidth_between(vl->parent->line, space);
381 		for (i = 0; i < width + 1; ++i)
382 			strlcat(buf, " ", len);
383 	} else {
384 		strlcpy(buf, *text_ret, len);
385 		if ((t = strchr(buf, ' ')) != NULL)
386 			*t = '\0';
387 		strlcat(buf, " ", len);
388 
389 		/* skip the emoji */
390                 *text_ret += (space - vl->parent->line) + 1;
391 	}
392 
393 	*prfx_ret = buf;
394 }
395 
396 static inline void
397 print_vline_descr(int width, WINDOW *window, struct vline *vl)
398 {
399 	int x, y, goal;
400 
401 	if (vl->parent->type != LINE_COMPL &&
402 	    vl->parent->type != LINE_COMPL_CURRENT)
403 		return;
404 
405 	if (vl->parent->alt == NULL)
406 		return;
407 
408 	(void)y;
409 	getyx(window, y, x);
410 
411 	goal = width/2;
412 	if (goal <= x)
413 		wprintw(window, " ");
414 	for (; goal > x; ++x)
415 		wprintw(window, " ");
416 
417 	wprintw(window, "%s", vl->parent->alt);
418 }
419 
420 /*
421  * Core part of the rendering.  It prints a vline starting from the
422  * current cursor position.  Printing a vline consists of skipping
423  * `off' columns (for olivetti-mode), print the correct prefix (which
424  * may be the emoji in case of emojified links-lines), printing the
425  * text itself, filling until width - off and filling off columns
426  * again.
427  */
428 static void
429 print_vline(int off, int width, WINDOW *window, struct vline *vl)
430 {
431 	/*
432 	 * Believe me or not, I've seen emoji ten code points long!
433 	 * That means, to stay large, 4*10 bytes + NUL.
434 	 */
435 	char emojibuf[41] = {0};
436 	const char *text, *prfx;
437 	struct line_face *f;
438 	int i, left, x, y;
439 
440 	f = &line_faces[vl->parent->type];
441 
442 	/* unused, set by getyx */
443 	(void)y;
444 
445 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
446 
447 	wattr_on(window, body_face.left, NULL);
448 	for (i = 0; i < off; i++)
449 		waddch(window, ' ');
450 	wattr_off(window, body_face.left, NULL);
451 
452 	wattr_on(window, f->prefix, NULL);
453 	wprintw(window, "%s", prfx);
454 	wattr_off(window, f->prefix, NULL);
455 
456 	wattr_on(window, f->text, NULL);
457 	wprintw(window, "%s", text);
458 	print_vline_descr(width, window, vl);
459 	wattr_off(window, f->text, NULL);
460 
461 	getyx(window, y, x);
462 
463 	left = width - x;
464 
465 	wattr_on(window, f->trail, NULL);
466 	for (i = 0; i < left - off; ++i)
467 		waddch(window, ' ');
468 	wattr_off(window, f->trail, NULL);
469 
470 	wattr_on(window, body_face.right, NULL);
471 	for (i = 0; i < off; i++)
472 		waddch(window, ' ');
473 	wattr_off(window, body_face.right, NULL);
474 
475 }
476 
477 static void
478 redraw_tabline(void)
479 {
480 	struct tab	*tab;
481 	size_t		 toskip, ots, tabwidth, space, x;
482 	int		 current, y, truncated, pair;
483 	const char	*title;
484 	char		 buf[25];
485 
486 	x = 0;
487 
488 	/* unused, but setted by a getyx */
489 	(void)y;
490 
491 	tabwidth = sizeof(buf)+1;
492 	space = COLS-2;
493 
494 	toskip = 0;
495 	TAILQ_FOREACH(tab, &tabshead, tabs) {
496 		toskip++;
497 		if (tab == current_tab)
498 			break;
499 	}
500 
501 	if (toskip * tabwidth < space)
502 		toskip = 0;
503 	else {
504 		ots = toskip;
505 		toskip--;
506                 while (toskip != 0 &&
507 		    (ots - toskip+1) * tabwidth < space)
508 			toskip--;
509 	}
510 
511 	werase(tabline);
512 	wattr_on(tabline, tab_face.background, NULL);
513 	wprintw(tabline, toskip == 0 ? " " : "<");
514 	wattr_off(tabline, tab_face.background, NULL);
515 
516 	truncated = 0;
517 	TAILQ_FOREACH(tab, &tabshead, tabs) {
518 		if (truncated)
519 			break;
520 		if (toskip != 0) {
521 			toskip--;
522 			continue;
523 		}
524 
525 		getyx(tabline, y, x);
526 		if (x + sizeof(buf)+2 >= (size_t)COLS)
527 			truncated = 1;
528 
529 		current = tab == current_tab;
530 
531 		if (*(title = tab->buffer.page.title) == '\0')
532 			title = tab->hist_cur->h;
533 
534 		if (tab->flags & TAB_URGENT)
535 			strlcpy(buf, "!", sizeof(buf));
536 		else
537 			strlcpy(buf, " ", sizeof(buf));
538 
539                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
540 			/* truncation happens */
541 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
542 		} else {
543 			/* pad with spaces */
544 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
545 				/* nop */ ;
546 		}
547 
548 		pair = current ? tab_face.current : tab_face.tab;
549 		wattr_on(tabline, pair, NULL);
550 		wprintw(tabline, "%s", buf);
551 		wattr_off(tabline, pair, NULL);
552 
553 		wattr_on(tabline, tab_face.background, NULL);
554 		if (TAILQ_NEXT(tab, tabs) != NULL)
555 			wprintw(tabline, "│");
556 		wattr_off(tabline, tab_face.background, NULL);
557 	}
558 
559 	wattr_on(tabline, tab_face.background, NULL);
560 	for (; x < (size_t)COLS; ++x)
561 		waddch(tabline, ' ');
562 	if (truncated)
563 		mvwprintw(tabline, 0, COLS-1, ">");
564 	wattr_off(tabline, tab_face.background, NULL);
565 }
566 
567 /*
568  * Compute the first visible line around vl.  Try to search forward
569  * until the end of the buffer; if a visible line is not found, search
570  * backward.  Return NULL if no viable line was found.
571  */
572 struct vline *
573 adjust_line(struct vline *vl, struct buffer *buffer)
574 {
575 	struct vline *t;
576 
577 	if (vl == NULL)
578 		return NULL;
579 
580 	if (!(vl->parent->flags & L_HIDDEN))
581 		return vl;
582 
583 	/* search forward */
584 	for (t = vl;
585 	     t != NULL && t->parent->flags & L_HIDDEN;
586 	     t = TAILQ_NEXT(t, vlines))
587 		;		/* nop */
588 
589 	if (t != NULL)
590 		return t;
591 
592 	/* search backward */
593 	for (t = vl;
594 	     t != NULL && t->parent->flags & L_HIDDEN;
595 	     t = TAILQ_PREV(t, vhead, vlines))
596 		;		/* nop */
597 
598 	return t;
599 }
600 
601 static void
602 redraw_window(WINDOW *win, int off, int height, int width, struct buffer *buffer)
603 {
604 	struct vline	*vl;
605 	int		 l, onscreen;
606 
607 	restore_curs_x(buffer);
608 
609 	/*
610 	 * TODO: ignoring buffer->force_update and always
611 	 * re-rendering.  In theory we can recompute the y position
612 	 * without a re-render, and optimize here.  It's not the only
613 	 * optimisation possible here, wscrl wolud also be an
614 	 * interesting one.
615 	 */
616 
617 again:
618 	werase(win);
619 	buffer->curs_y = 0;
620 
621 	if (TAILQ_EMPTY(&buffer->head))
622 		goto end;
623 
624 	if (buffer->top_line == NULL)
625 		buffer->top_line = TAILQ_FIRST(&buffer->head);
626 
627 	buffer->top_line = adjust_line(buffer->top_line, buffer);
628 	if (buffer->top_line == NULL)
629 		goto end;
630 
631 	buffer->current_line = adjust_line(buffer->current_line, buffer);
632 
633 	l = 0;
634 	onscreen = 0;
635 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
636 		if (vl->parent->flags & L_HIDDEN)
637 			continue;
638 
639 		wmove(win, l, 0);
640 		print_vline(off, width, win, vl);
641 
642 		if (vl == buffer->current_line)
643 			onscreen = 1;
644 
645 		if (!onscreen)
646 			buffer->curs_y++;
647 
648 		l++;
649 		if (l == height)
650 			break;
651 	}
652 
653 	if (!onscreen) {
654 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
655 			if (vl == buffer->current_line)
656 				break;
657 			if (vl->parent->flags & L_HIDDEN)
658 				continue;
659 			buffer->line_off++;
660 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
661 		}
662 
663 		if (vl != NULL)
664 			goto again;
665 	}
666 
667 	buffer->last_line_off = buffer->line_off;
668 	buffer->force_redraw = 0;
669 end:
670 	wmove(win, buffer->curs_y, buffer->curs_x);
671 }
672 
673 static void
674 redraw_help(void)
675 {
676 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
677 }
678 
679 static void
680 redraw_body(struct tab *tab)
681 {
682 	static struct tab *last_tab;
683 
684 	if (last_tab != tab)
685 		tab->buffer.force_redraw =1;
686 	last_tab = tab;
687 
688 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
689 }
690 
691 static inline char
692 trust_status_char(enum trust_state ts)
693 {
694 	switch (ts) {
695 	case TS_UNKNOWN:	return '-';
696 	case TS_UNTRUSTED:	return '!';
697 	case TS_TEMP_TRUSTED:	return '!';
698 	case TS_TRUSTED:	return 'v';
699 	case TS_VERIFIED:	return 'V';
700 	default:		return 'X';
701 	}
702 }
703 
704 static void
705 redraw_modeline(struct tab *tab)
706 {
707 	struct buffer	*buffer;
708 	double		 pct;
709 	int		 x, y, max_x, max_y;
710 	const char	*mode;
711 	const char	*spin = "-\\|/";
712 
713 	buffer = current_buffer();
714 	mode = buffer->page.name;
715 
716 	werase(modeline);
717 	wattr_on(modeline, modeline_face.background, NULL);
718 	wmove(modeline, 0, 0);
719 
720 	wprintw(modeline, "-%c%c %s ",
721 	    spin[tab->loading_anim_step],
722 	    trust_status_char(tab->trust),
723 	    mode == NULL ? "(none)" : mode);
724 
725 	pct = (buffer->line_off + buffer->curs_y) * 100.0
726 		/ buffer->line_max;
727 
728 	if (buffer->line_max <= (size_t)body_lines)
729                 wprintw(modeline, "All ");
730 	else if (buffer->line_off == 0)
731                 wprintw(modeline, "Top ");
732 	else if (buffer->line_off + body_lines >= buffer->line_max)
733 		wprintw(modeline, "Bottom ");
734 	else
735 		wprintw(modeline, "%.0f%% ", pct);
736 
737 	wprintw(modeline, "%d/%d %s ",
738 	    buffer->line_off + buffer->curs_y,
739 	    buffer->line_max,
740 	    tab->hist_cur->h);
741 
742 	getyx(modeline, y, x);
743 	getmaxyx(modeline, max_y, max_x);
744 
745 	(void)y;
746 	(void)max_y;
747 
748 	for (; x < max_x; ++x)
749 		waddstr(modeline, "-");
750 
751 	wattr_off(modeline, modeline_face.background, NULL);
752 }
753 
754 static void
755 redraw_minibuffer(void)
756 {
757 	wattr_on(echoarea, minibuffer_face.background, NULL);
758 	werase(echoarea);
759 
760 	if (in_minibuffer)
761 		do_redraw_minibuffer();
762 	else
763 		do_redraw_echoarea();
764 
765 	if (in_minibuffer == MB_COMPREAD)
766 		do_redraw_minibuffer_compl();
767 
768 	wattr_off(echoarea, minibuffer_face.background, NULL);
769 }
770 
771 static void
772 do_redraw_echoarea(void)
773 {
774 	struct vline *vl;
775 
776 	if (ministate.curmesg != NULL)
777                 wprintw(echoarea, "%s", ministate.curmesg);
778 	else if (*keybuf != '\0')
779 		waddstr(echoarea, keybuf);
780 	else {
781 		/* If nothing else, show the URL at point */
782 		vl = current_tab->buffer.current_line;
783 		if (vl != NULL && vl->parent->type == LINE_LINK)
784 			waddstr(echoarea, vl->parent->alt);
785 	}
786 }
787 
788 static void
789 do_redraw_minibuffer(void)
790 {
791 	size_t		 off_y, off_x = 0;
792 	const char	*start, *c;
793 
794 	/* unused, set by getyx */
795 	(void)off_y;
796 
797 	wmove(echoarea, 0, 0);
798 
799 	if (in_minibuffer == MB_COMPREAD)
800 		wprintw(echoarea, "(%2d) ",
801 		    ministate.compl.buffer.line_max);
802 
803 	wprintw(echoarea, "%s", ministate.prompt);
804 	if (ministate.hist_cur != NULL)
805 		wprintw(echoarea, "(%zu/%zu) ",
806 		    ministate.hist_off + 1,
807 		    ministate.history->len);
808 
809 	getyx(echoarea, off_y, off_x);
810 
811 	start = ministate.hist_cur != NULL
812 		? ministate.hist_cur->h
813 		: ministate.buf;
814 	c = utf8_nth(ministate.buffer.current_line->line,
815 	    ministate.buffer.cpoff);
816 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
817 		start = utf8_next_cp(start);
818 	}
819 
820 	waddstr(echoarea, start);
821 
822 	if (ministate.curmesg != NULL)
823 		wprintw(echoarea, " [%s]", ministate.curmesg);
824 
825 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
826 }
827 
828 static void
829 do_redraw_minibuffer_compl(void)
830 {
831 	redraw_window(minibuffer, 0, 10, COLS,
832 	    &ministate.compl.buffer);
833 }
834 
835 /*
836  * Place the cursor in the right ncurses window.  If soft is 1, use
837  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
838  * wrefresh.
839  */
840 static void
841 place_cursor(int soft)
842 {
843 	int (*touch)(WINDOW *);
844 
845 	if (soft)
846 		touch = wnoutrefresh;
847 	else
848 		touch = wrefresh;
849 
850 	if (in_minibuffer) {
851 		if (side_window)
852 			touch(help);
853 		touch(body);
854 		touch(echoarea);
855 	} else if (in_side_window) {
856 		touch(body);
857 		touch(echoarea);
858 		touch(help);
859 	} else {
860 		if (side_window)
861 			touch(help);
862 		touch(echoarea);
863 		touch(body);
864 	}
865 }
866 
867 static void
868 redraw_tab(struct tab *tab)
869 {
870 	if (too_small)
871 		return;
872 
873 	if (side_window) {
874 		redraw_help();
875 		wnoutrefresh(help);
876 	}
877 
878 	redraw_tabline();
879 	redraw_body(tab);
880 	redraw_modeline(tab);
881 	redraw_minibuffer();
882 
883 	wnoutrefresh(tabline);
884 	wnoutrefresh(modeline);
885 
886 	if (in_minibuffer == MB_COMPREAD)
887 		wnoutrefresh(minibuffer);
888 
889 	place_cursor(1);
890 
891 	doupdate();
892 
893 	if (set_title)
894 		dprintf(1, "\033]0;%s - Telescope\a",
895 		    current_tab->buffer.page.title);
896 }
897 
898 void
899 start_loading_anim(struct tab *tab)
900 {
901 	if (tab->loading_anim)
902 		return;
903 	tab->loading_anim = 1;
904 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
905 	evtimer_add(&tab->loadingev, &loadingev_timer);
906 }
907 
908 static void
909 update_loading_anim(int fd, short ev, void *d)
910 {
911 	struct tab	*tab = d;
912 
913 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
914 
915 	if (tab == current_tab) {
916 		redraw_modeline(tab);
917 		wrefresh(modeline);
918 		wrefresh(body);
919 		if (in_minibuffer)
920 			wrefresh(echoarea);
921 	}
922 
923 	evtimer_add(&tab->loadingev, &loadingev_timer);
924 }
925 
926 static void
927 stop_loading_anim(struct tab *tab)
928 {
929 	if (!tab->loading_anim)
930 		return;
931 	evtimer_del(&tab->loadingev);
932 	tab->loading_anim = 0;
933 	tab->loading_anim_step = 0;
934 
935 	if (tab != current_tab)
936 		return;
937 
938 	redraw_modeline(tab);
939 
940 	wrefresh(modeline);
941 	wrefresh(body);
942 	if (in_minibuffer)
943 		wrefresh(echoarea);
944 }
945 
946 void
947 load_url_in_tab(struct tab *tab, const char *url, const char *base)
948 {
949 	if (!operating) {
950 		load_url(tab, url, base);
951 		return;
952 	}
953 
954 	message("Loading %s...", url);
955 	start_loading_anim(tab);
956 	load_url(tab, url, base);
957 
958 	redraw_tab(tab);
959 }
960 
961 void
962 switch_to_tab(struct tab *tab)
963 {
964 	current_tab = tab;
965 	tab->flags &= ~TAB_URGENT;
966 
967 	if (operating && tab->flags & TAB_LAZY)
968 		load_url_in_tab(tab, tab->hist_cur->h, NULL);
969 }
970 
971 unsigned int
972 tab_new_id(void)
973 {
974 	return tab_counter++;
975 }
976 
977 struct tab *
978 new_tab(const char *url, const char *base)
979 {
980 	struct tab	*tab;
981 
982 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
983 		event_loopbreak();
984 		return NULL;
985 	}
986 	tab->fd = -1;
987 
988 	TAILQ_INIT(&tab->hist.head);
989 
990 	TAILQ_INIT(&tab->buffer.head);
991 
992 	tab->id = tab_new_id();
993 	if (!operating)
994 		tab->flags |= TAB_LAZY;
995 	switch_to_tab(tab);
996 
997 	if (TAILQ_EMPTY(&tabshead))
998 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
999 	else
1000 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1001 
1002 	load_url_in_tab(tab, url, base);
1003 	return tab;
1004 }
1005 
1006 int
1007 ui_print_colors(void)
1008 {
1009 	int colors = 0, pairs = 0, can_change = 0;
1010 	int columns = 16, lines, color, i, j;
1011 
1012 	initscr();
1013 	if (has_colors()) {
1014 		start_color();
1015 		use_default_colors();
1016 
1017 		colors = COLORS;
1018 		pairs = COLOR_PAIRS;
1019 		can_change = can_change_color();
1020 	}
1021 	endwin();
1022 
1023 	printf("Term info:\n");
1024 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1025 	    getenv("TERM"), colors, pairs, can_change);
1026 	printf("\n");
1027 
1028 	if (colors == 0) {
1029 		printf("No color support\n");
1030 		return 0;
1031 	}
1032 
1033 	printf("Available colors:\n\n");
1034 	lines = (colors - 1) / columns + 1;
1035 	color = 0;
1036 	for (i = 0; i < lines; ++i) {
1037 		for (j = 0; j < columns; ++j, ++color) {
1038 			printf("\033[0;38;5;%dm %03d", color, color);
1039 		}
1040 		printf("\n");
1041 	}
1042 
1043 	printf("\033[0m");
1044 	fflush(stdout);
1045 	return 0;
1046 }
1047 
1048 int
1049 ui_init()
1050 {
1051 	setlocale(LC_ALL, "");
1052 
1053 	minibuffer_init();
1054 
1055 	/* initialize help window */
1056 	TAILQ_INIT(&helpwin.head);
1057 
1058 	base_map = &global_map;
1059 	current_map = &global_map;
1060 
1061 	initscr();
1062 
1063 	if (enable_colors) {
1064 		if (has_colors()) {
1065 			start_color();
1066 			use_default_colors();
1067 		} else
1068 			enable_colors = 0;
1069 	}
1070 
1071 	config_apply_style();
1072 
1073 	raw();
1074 	noecho();
1075 	nonl();
1076 	intrflush(stdscr, FALSE);
1077 
1078 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1079 		return 0;
1080 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1081 		return 0;
1082 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1083 		return 0;
1084 	if ((echoarea = newwin(1, COLS, LINES-1, 0)) == NULL)
1085 		return 0;
1086 	if ((minibuffer = newwin(1, COLS, LINES-1, 0)) == NULL)
1087 		return 0;
1088 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1089 		return 0;
1090 
1091 	body_lines = LINES-3;
1092 	body_cols = COLS;
1093 
1094 	wbkgd(body, body_face.body);
1095 	wbkgd(echoarea, minibuffer_face.background);
1096 
1097 	update_x_offset();
1098 
1099 	keypad(body, TRUE);
1100 	scrollok(body, FALSE);
1101 
1102 	/* non-blocking input */
1103 	wtimeout(body, 0);
1104 	wtimeout(help, 0);
1105 
1106 	mvwprintw(body, 0, 0, "");
1107 
1108 	evtimer_set(&resizeev, handle_resize, NULL);
1109 
1110 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1111 	event_add(&stdioev, NULL);
1112 
1113 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1114 	signal_add(&winchev, NULL);
1115 
1116 	return 1;
1117 }
1118 
1119 void
1120 ui_main_loop(void)
1121 {
1122 	operating = 1;
1123 	switch_to_tab(current_tab);
1124 	redraw_tab(current_tab);
1125 
1126 	event_dispatch();
1127 }
1128 
1129 void
1130 ui_on_tab_loaded(struct tab *tab)
1131 {
1132 	stop_loading_anim(tab);
1133 	message("Loaded %s", tab->hist_cur->h);
1134 
1135 	redraw_tabline();
1136 	wrefresh(tabline);
1137 	place_cursor(0);
1138 }
1139 
1140 void
1141 ui_on_tab_refresh(struct tab *tab)
1142 {
1143 	wrap_page(&tab->buffer, body_cols);
1144 	if (tab == current_tab)
1145 		redraw_tab(tab);
1146 	else
1147 		tab->flags |= TAB_URGENT;
1148 }
1149 
1150 const char *
1151 ui_keyname(int k)
1152 {
1153 	return keyname(k);
1154 }
1155 
1156 void
1157 ui_toggle_side_window(void)
1158 {
1159 	side_window = !side_window;
1160 	if (side_window)
1161 		recompute_help();
1162 	else
1163 		in_side_window = 0;
1164 
1165 	/*
1166 	 * ugly hack, but otherwise the window doesn't get updated
1167 	 * until I call rearrange_windows a second time (e.g. via
1168 	 * C-l).  I will be happy to know why something like this is
1169 	 * needed.
1170 	 */
1171 	rearrange_windows();
1172 	rearrange_windows();
1173 }
1174 
1175 void
1176 ui_schedule_redraw(void)
1177 {
1178 	should_rearrange_windows = 1;
1179 }
1180 
1181 void
1182 ui_require_input(struct tab *tab, int hide)
1183 {
1184 	/* TODO: hard-switching to another tab is ugly */
1185 	switch_to_tab(tab);
1186 
1187 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1188 	    &ir_history, NULL, NULL);
1189 	strlcpy(ministate.prompt, "Input required: ",
1190 	    sizeof(ministate.prompt));
1191 	redraw_tab(tab);
1192 }
1193 
1194 void
1195 ui_after_message_hook(void)
1196 {
1197 	redraw_minibuffer();
1198 	place_cursor(0);
1199 }
1200 
1201 void
1202 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1203     struct tab *data)
1204 {
1205 	yornp(prompt, fn, data);
1206 	redraw_tab(current_tab);
1207 }
1208 
1209 void
1210 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1211     struct tab *data)
1212 {
1213 	minibuffer_read(prompt, fn, data);
1214 	redraw_tab(current_tab);
1215 }
1216 
1217 void
1218 ui_other_window(void)
1219 {
1220 	if (side_window)
1221 		in_side_window = !in_side_window;
1222 	else
1223 		message("No other window to select");
1224 }
1225 
1226 void
1227 ui_suspend(void)
1228 {
1229 	endwin();
1230 
1231 	kill(getpid(), SIGSTOP);
1232 
1233 	refresh();
1234 	clear();
1235 	rearrange_windows();
1236 }
1237 
1238 void
1239 ui_end(void)
1240 {
1241 	endwin();
1242 }