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Date:: Wed Jul 21 14:35:24 2021 UTC
Message:: always include compat.h first
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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 
102 static struct timeval	loadingev_timer = { 0, 250000 };
103 
104 static uint32_t		 tab_counter;
105 
106 static char	keybuf[64];
107 
108 struct kmap global_map,
109 	minibuffer_map,
110 	*current_map,
111 	*base_map;
112 
113 int in_minibuffer;
114 
115 static inline void
116 update_x_offset(void)
117 {
118 	if (olivetti_mode && fill_column < body_cols)
119 		x_offset = (body_cols - fill_column)/2;
120 	else
121 		x_offset = 0;
122 }
123 
124 void
125 save_excursion(struct excursion *place, struct buffer *buffer)
126 {
127 	place->curs_x = buffer->curs_x;
128 	place->curs_y = buffer->curs_y;
129 	place->line_off = buffer->line_off;
130 	place->top_line = buffer->top_line;
131 	place->current_line = buffer->current_line;
132 	place->cpoff = buffer->cpoff;
133 }
134 
135 void
136 restore_excursion(struct excursion *place, struct buffer *buffer)
137 {
138 	buffer->curs_x = place->curs_x;
139 	buffer->curs_y = place->curs_y;
140 	buffer->line_off = place->line_off;
141 	buffer->top_line = place->top_line;
142 	buffer->current_line = place->current_line;
143 	buffer->cpoff = place->cpoff;
144 }
145 
146 static void
147 restore_curs_x(struct buffer *buffer)
148 {
149 	struct vline	*vl;
150 	const char	*prfx, *text;
151 
152 	vl = buffer->current_line;
153 	if (vl == NULL || vl->line == NULL)
154 		buffer->curs_x = buffer->cpoff = 0;
155 	else if (vl->parent->data != NULL) {
156 		text = vl->parent->data;
157 		buffer->curs_x = utf8_snwidth(text + 1, buffer->cpoff) + 1;
158 	} else
159 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
160 
161 	buffer->curs_x += x_offset;
162 
163 	if (vl == NULL)
164 		return;
165 
166 	if (vl->parent->data != NULL)
167 		buffer->curs_x += utf8_swidth_between(vl->parent->line, 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 	return &current_tab->buffer;
186 }
187 
188 static int
189 readkey(void)
190 {
191 	uint32_t state = 0;
192 
193 	if ((thiskey.key = wgetch(body)) == ERR)
194 		return 0;
195 
196 	thiskey.meta = thiskey.key == 27;
197 	if (thiskey.meta) {
198 		thiskey.key = wgetch(body);
199 		if (thiskey.key == ERR || thiskey.key == 27) {
200 			thiskey.meta = 0;
201 			thiskey.key = 27;
202 		}
203 	}
204 
205 	thiskey.cp = 0;
206 	if ((unsigned int)thiskey.key < UINT8_MAX) {
207 		while (1) {
208 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
209 				break;
210 			if ((thiskey.key = wgetch(body)) == ERR) {
211 				message("Error decoding user input");
212 				return 0;
213 			}
214 		}
215 	}
216 
217 	return 1;
218 }
219 
220 static void
221 dispatch_stdio(int fd, short ev, void *d)
222 {
223 	struct keymap	*k;
224 	const char	*keyname;
225 	char		 tmp[5] = {0};
226 
227 	/* TODO: schedule a redraw? */
228 	if (too_small)
229 		return;
230 
231 	if (!readkey())
232 		return;
233 
234 	if (keybuf[0] != '\0')
235 		strlcat(keybuf, " ", sizeof(keybuf));
236 	if (thiskey.meta)
237 		strlcat(keybuf, "M-", sizeof(keybuf));
238 	if (thiskey.cp != 0) {
239 		utf8_encode(thiskey.cp, tmp);
240 		strlcat(keybuf, tmp, sizeof(keybuf));
241 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
242 		strlcat(keybuf, keyname, sizeof(keybuf));
243 	} else {
244 		tmp[0] = thiskey.key;
245 		strlcat(keybuf, tmp, sizeof(keybuf));
246 	}
247 
248 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
249 		if (k->meta == thiskey.meta &&
250 		    k->key == thiskey.key) {
251 			if (k->fn == NULL)
252 				current_map = &k->map;
253 			else {
254 				current_map = base_map;
255 				strlcpy(keybuf, "", sizeof(keybuf));
256 				k->fn(current_buffer());
257 			}
258 			goto done;
259 		}
260 	}
261 
262 	if (current_map->unhandled_input != NULL)
263 		current_map->unhandled_input();
264 	else
265 		global_key_unbound();
266 
267 	strlcpy(keybuf, "", sizeof(keybuf));
268 	current_map = base_map;
269 
270 done:
271 	if (side_window)
272 		recompute_help();
273 
274 	if (should_rearrange_windows)
275 		rearrange_windows();
276 	redraw_tab(current_tab);
277 }
278 
279 static void
280 handle_resize(int sig, short ev, void *d)
281 {
282 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
283 		event_del(&resizeev);
284 	}
285 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
286 	evtimer_add(&resizeev, &resize_timer);
287 }
288 
289 static void
290 handle_resize_nodelay(int s, short ev, void *d)
291 {
292 	endwin();
293 	refresh();
294 	clear();
295 
296 	rearrange_windows();
297 }
298 
299 static void
300 rearrange_windows(void)
301 {
302 	int		 lines;
303 
304 	should_rearrange_windows = 0;
305 
306 	lines = LINES;
307 
308 	if ((too_small = lines < 15)) {
309 		erase();
310 		printw("Window too small.");
311 		refresh();
312 		return;
313 	}
314 
315 	/* move and resize the windows, in reverse order! */
316 
317 	if (in_minibuffer == MB_COMPREAD) {
318 		mvwin(minibuffer, lines-10, 0);
319 		wresize(minibuffer, 10, COLS);
320 		lines -= 10;
321 
322 		wrap_page(&ministate.compl.buffer, COLS);
323 	}
324 
325 	mvwin(echoarea, --lines, 0);
326 	wresize(echoarea, 1, COLS);
327 
328 	mvwin(modeline, --lines, 0);
329 	wresize(modeline, 1, COLS);
330 
331 	body_lines = --lines;
332 	body_cols = COLS;
333 
334 	if (side_window) {
335 		help_cols = 0.3 * COLS;
336 		help_lines = lines;
337 		mvwin(help, 1, 0);
338 		wresize(help, help_lines, help_cols);
339 
340 		wrap_page(&helpwin, help_cols);
341 
342 		body_cols = COLS - help_cols - 1;
343 		mvwin(body, 1, help_cols);
344 	} else
345 		mvwin(body, 1, 0);
346 
347 	update_x_offset();
348 	wresize(body, body_lines, body_cols);
349 
350 	wresize(tabline, 1, COLS);
351 
352 	wrap_page(&current_tab->buffer, body_cols);
353 	redraw_tab(current_tab);
354 }
355 
356 static void
357 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
358     const char **prfx_ret, const char **text_ret)
359 {
360 	int type, i, cont, width;
361 	char *space, *t;
362 
363 	if ((*text_ret = vl->line) == NULL)
364 		*text_ret = "";
365 
366 	cont = vl->flags & L_CONTINUATION;
367 	type = vl->parent->type;
368 	if (!cont)
369 		*prfx_ret = line_prefixes[type].prfx1;
370 	else
371 		*prfx_ret = line_prefixes[type].prfx2;
372 
373 	space = vl->parent->data;
374 	if (!emojify_link || type != LINE_LINK || space == NULL)
375 		return;
376 
377 	if (cont) {
378 		memset(buf, 0, len);
379 		width = utf8_swidth_between(vl->parent->line, space);
380 		for (i = 0; i < width + 1; ++i)
381 			strlcat(buf, " ", len);
382 	} else {
383 		strlcpy(buf, *text_ret, len);
384 		if ((t = strchr(buf, ' ')) != NULL)
385 			*t = '\0';
386 		strlcat(buf, " ", len);
387 
388 		/* skip the emoji */
389                 *text_ret += (space - vl->parent->line) + 1;
390 	}
391 
392 	*prfx_ret = buf;
393 }
394 
395 static inline void
396 print_vline_descr(int width, WINDOW *window, struct vline *vl)
397 {
398 	int x, y, goal;
399 
400 	if (vl->parent->type != LINE_COMPL &&
401 	    vl->parent->type != LINE_COMPL_CURRENT)
402 		return;
403 
404 	if (vl->parent->alt == NULL)
405 		return;
406 
407 	(void)y;
408 	getyx(window, y, x);
409 
410 	goal = width/2;
411 	if (goal <= x)
412 		wprintw(window, " ");
413 	for (; goal > x; ++x)
414 		wprintw(window, " ");
415 
416 	wprintw(window, "%s", vl->parent->alt);
417 }
418 
419 /*
420  * Core part of the rendering.  It prints a vline starting from the
421  * current cursor position.  Printing a vline consists of skipping
422  * `off' columns (for olivetti-mode), print the correct prefix (which
423  * may be the emoji in case of emojified links-lines), printing the
424  * text itself, filling until width - off and filling off columns
425  * again.
426  */
427 static void
428 print_vline(int off, int width, WINDOW *window, struct vline *vl)
429 {
430 	/*
431 	 * Believe me or not, I've seen emoji ten code points long!
432 	 * That means, to stay large, 4*10 bytes + NUL.
433 	 */
434 	char emojibuf[41] = {0};
435 	const char *text, *prfx;
436 	struct line_face *f;
437 	int i, left, x, y;
438 
439 	f = &line_faces[vl->parent->type];
440 
441 	/* unused, set by getyx */
442 	(void)y;
443 
444 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
445 
446 	wattr_on(window, body_face.left, NULL);
447 	for (i = 0; i < off; i++)
448 		waddch(window, ' ');
449 	wattr_off(window, body_face.left, NULL);
450 
451 	wattr_on(window, f->prefix, NULL);
452 	wprintw(window, "%s", prfx);
453 	wattr_off(window, f->prefix, NULL);
454 
455 	wattr_on(window, f->text, NULL);
456 	wprintw(window, "%s", text);
457 	print_vline_descr(width, window, vl);
458 	wattr_off(window, f->text, NULL);
459 
460 	getyx(window, y, x);
461 
462 	left = width - x;
463 
464 	wattr_on(window, f->trail, NULL);
465 	for (i = 0; i < left - off; ++i)
466 		waddch(window, ' ');
467 	wattr_off(window, f->trail, NULL);
468 
469 	wattr_on(window, body_face.right, NULL);
470 	for (i = 0; i < off; i++)
471 		waddch(window, ' ');
472 	wattr_off(window, body_face.right, NULL);
473 
474 }
475 
476 static void
477 redraw_tabline(void)
478 {
479 	struct tab	*tab;
480 	size_t		 toskip, ots, tabwidth, space, x;
481 	int		 current, y, truncated, pair;
482 	const char	*title;
483 	char		 buf[25];
484 
485 	x = 0;
486 
487 	/* unused, but setted by a getyx */
488 	(void)y;
489 
490 	tabwidth = sizeof(buf)+1;
491 	space = COLS-2;
492 
493 	toskip = 0;
494 	TAILQ_FOREACH(tab, &tabshead, tabs) {
495 		toskip++;
496 		if (tab == current_tab)
497 			break;
498 	}
499 
500 	if (toskip * tabwidth < space)
501 		toskip = 0;
502 	else {
503 		ots = toskip;
504 		toskip--;
505                 while (toskip != 0 &&
506 		    (ots - toskip+1) * tabwidth < space)
507 			toskip--;
508 	}
509 
510 	werase(tabline);
511 	wattr_on(tabline, tab_face.background, NULL);
512 	wprintw(tabline, toskip == 0 ? " " : "<");
513 	wattr_off(tabline, tab_face.background, NULL);
514 
515 	truncated = 0;
516 	TAILQ_FOREACH(tab, &tabshead, tabs) {
517 		if (truncated)
518 			break;
519 		if (toskip != 0) {
520 			toskip--;
521 			continue;
522 		}
523 
524 		getyx(tabline, y, x);
525 		if (x + sizeof(buf)+2 >= (size_t)COLS)
526 			truncated = 1;
527 
528 		current = tab == current_tab;
529 
530 		if (*(title = tab->buffer.page.title) == '\0')
531 			title = tab->hist_cur->h;
532 
533 		if (tab->flags & TAB_URGENT)
534 			strlcpy(buf, "!", sizeof(buf));
535 		else
536 			strlcpy(buf, " ", sizeof(buf));
537 
538                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
539 			/* truncation happens */
540 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
541 		} else {
542 			/* pad with spaces */
543 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
544 				/* nop */ ;
545 		}
546 
547 		pair = current ? tab_face.current : tab_face.tab;
548 		wattr_on(tabline, pair, NULL);
549 		wprintw(tabline, "%s", buf);
550 		wattr_off(tabline, pair, NULL);
551 
552 		wattr_on(tabline, tab_face.background, NULL);
553 		if (TAILQ_NEXT(tab, tabs) != NULL)
554 			wprintw(tabline, "│");
555 		wattr_off(tabline, tab_face.background, NULL);
556 	}
557 
558 	wattr_on(tabline, tab_face.background, NULL);
559 	for (; x < (size_t)COLS; ++x)
560 		waddch(tabline, ' ');
561 	if (truncated)
562 		mvwprintw(tabline, 0, COLS-1, ">");
563 	wattr_off(tabline, tab_face.background, NULL);
564 }
565 
566 /*
567  * Compute the first visible line around vl.  Try to search forward
568  * until the end of the buffer; if a visible line is not found, search
569  * backward.  Return NULL if no viable line was found.
570  */
571 struct vline *
572 adjust_line(struct vline *vl, struct buffer *buffer)
573 {
574 	struct vline *t;
575 
576 	if (vl == NULL)
577 		return NULL;
578 
579 	if (!(vl->parent->flags & L_HIDDEN))
580 		return vl;
581 
582 	/* search forward */
583 	for (t = vl;
584 	     t != NULL && t->parent->flags & L_HIDDEN;
585 	     t = TAILQ_NEXT(t, vlines))
586 		;		/* nop */
587 
588 	if (t != NULL)
589 		return t;
590 
591 	/* search backward */
592 	for (t = vl;
593 	     t != NULL && t->parent->flags & L_HIDDEN;
594 	     t = TAILQ_PREV(t, vhead, vlines))
595 		;		/* nop */
596 
597 	return t;
598 }
599 
600 static void
601 redraw_window(WINDOW *win, int off, int height, int width, struct buffer *buffer)
602 {
603 	struct vline	*vl;
604 	int		 l, onscreen;
605 
606 	restore_curs_x(buffer);
607 
608 	/*
609 	 * TODO: ignoring buffer->force_update and always
610 	 * re-rendering.  In theory we can recompute the y position
611 	 * without a re-render, and optimize here.  It's not the only
612 	 * optimisation possible here, wscrl wolud also be an
613 	 * interesting one.
614 	 */
615 
616 again:
617 	werase(win);
618 	buffer->curs_y = 0;
619 
620 	if (TAILQ_EMPTY(&buffer->head))
621 		goto end;
622 
623 	if (buffer->top_line == NULL)
624 		buffer->top_line = TAILQ_FIRST(&buffer->head);
625 
626 	buffer->top_line = adjust_line(buffer->top_line, buffer);
627 	if (buffer->top_line == NULL)
628 		goto end;
629 
630 	buffer->current_line = adjust_line(buffer->current_line, buffer);
631 
632 	l = 0;
633 	onscreen = 0;
634 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
635 		if (vl->parent->flags & L_HIDDEN)
636 			continue;
637 
638 		wmove(win, l, 0);
639 		print_vline(off, width, win, vl);
640 
641 		if (vl == buffer->current_line)
642 			onscreen = 1;
643 
644 		if (!onscreen)
645 			buffer->curs_y++;
646 
647 		l++;
648 		if (l == height)
649 			break;
650 	}
651 
652 	if (!onscreen) {
653 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
654 			if (vl == buffer->current_line)
655 				break;
656 			if (vl->parent->flags & L_HIDDEN)
657 				continue;
658 			buffer->line_off++;
659 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
660 		}
661 
662 		if (vl != NULL)
663 			goto again;
664 	}
665 
666 	buffer->last_line_off = buffer->line_off;
667 	buffer->force_redraw = 0;
668 end:
669 	wmove(win, buffer->curs_y, buffer->curs_x);
670 }
671 
672 static void
673 redraw_help(void)
674 {
675 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
676 }
677 
678 static void
679 redraw_body(struct tab *tab)
680 {
681 	static struct tab *last_tab;
682 
683 	if (last_tab != tab)
684 		tab->buffer.force_redraw =1;
685 	last_tab = tab;
686 
687 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
688 }
689 
690 static inline char
691 trust_status_char(enum trust_state ts)
692 {
693 	switch (ts) {
694 	case TS_UNKNOWN:	return '-';
695 	case TS_UNTRUSTED:	return '!';
696 	case TS_TEMP_TRUSTED:	return '!';
697 	case TS_TRUSTED:	return 'v';
698 	case TS_VERIFIED:	return 'V';
699 	default:		return 'X';
700 	}
701 }
702 
703 static void
704 redraw_modeline(struct tab *tab)
705 {
706 	double		 pct;
707 	int		 x, y, max_x, max_y;
708 	const char	*mode = tab->buffer.page.name;
709 	const char	*spin = "-\\|/";
710 
711 	werase(modeline);
712 	wattr_on(modeline, modeline_face.background, NULL);
713 	wmove(modeline, 0, 0);
714 
715 	wprintw(modeline, "-%c%c %s ",
716 	    spin[tab->loading_anim_step],
717 	    trust_status_char(tab->trust),
718 	    mode == NULL ? "(none)" : mode);
719 
720 	pct = (tab->buffer.line_off + tab->buffer.curs_y) * 100.0
721 		/ tab->buffer.line_max;
722 
723 	if (tab->buffer.line_max <= (size_t)body_lines)
724                 wprintw(modeline, "All ");
725 	else if (tab->buffer.line_off == 0)
726                 wprintw(modeline, "Top ");
727 	else if (tab->buffer.line_off + body_lines >= tab->buffer.line_max)
728 		wprintw(modeline, "Bottom ");
729 	else
730 		wprintw(modeline, "%.0f%% ", pct);
731 
732 	wprintw(modeline, "%d/%d %s ",
733 	    tab->buffer.line_off + tab->buffer.curs_y,
734 	    tab->buffer.line_max,
735 	    tab->hist_cur->h);
736 
737 	getyx(modeline, y, x);
738 	getmaxyx(modeline, max_y, max_x);
739 
740 	(void)y;
741 	(void)max_y;
742 
743 	for (; x < max_x; ++x)
744 		waddstr(modeline, "-");
745 
746 	wattr_off(modeline, modeline_face.background, NULL);
747 }
748 
749 static void
750 redraw_minibuffer(void)
751 {
752 	wattr_on(echoarea, minibuffer_face.background, NULL);
753 	werase(echoarea);
754 
755 	if (in_minibuffer)
756 		do_redraw_minibuffer();
757 	else
758 		do_redraw_echoarea();
759 
760 	if (in_minibuffer == MB_COMPREAD)
761 		do_redraw_minibuffer_compl();
762 
763 	wattr_off(echoarea, minibuffer_face.background, NULL);
764 }
765 
766 static void
767 do_redraw_echoarea(void)
768 {
769 	struct vline *vl;
770 
771 	if (ministate.curmesg != NULL)
772                 wprintw(echoarea, "%s", ministate.curmesg);
773 	else if (*keybuf != '\0')
774 		waddstr(echoarea, keybuf);
775 	else {
776 		/* If nothing else, show the URL at point */
777 		vl = current_tab->buffer.current_line;
778 		if (vl != NULL && vl->parent->type == LINE_LINK)
779 			waddstr(echoarea, vl->parent->alt);
780 	}
781 }
782 
783 static void
784 do_redraw_minibuffer(void)
785 {
786 	size_t		 off_y, off_x = 0;
787 	const char	*start, *c;
788 
789 	/* unused, set by getyx */
790 	(void)off_y;
791 
792 	wmove(echoarea, 0, 0);
793 
794 	if (in_minibuffer == MB_COMPREAD)
795 		wprintw(echoarea, "(%2d) ",
796 		    ministate.compl.buffer.line_max);
797 
798 	wprintw(echoarea, "%s", ministate.prompt);
799 	if (ministate.hist_cur != NULL)
800 		wprintw(echoarea, "(%zu/%zu) ",
801 		    ministate.hist_off + 1,
802 		    ministate.history->len);
803 
804 	getyx(echoarea, off_y, off_x);
805 
806 	start = ministate.hist_cur != NULL
807 		? ministate.hist_cur->h
808 		: ministate.buf;
809 	c = utf8_nth(ministate.buffer.current_line->line,
810 	    ministate.buffer.cpoff);
811 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
812 		start = utf8_next_cp(start);
813 	}
814 
815 	waddstr(echoarea, start);
816 
817 	if (ministate.curmesg != NULL)
818 		wprintw(echoarea, " [%s]", ministate.curmesg);
819 
820 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
821 }
822 
823 static void
824 do_redraw_minibuffer_compl(void)
825 {
826 	redraw_window(minibuffer, 0, 10, body_cols,
827 	    &ministate.compl.buffer);
828 }
829 
830 /*
831  * Place the cursor in the right ncurses window.  If soft is 1, use
832  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
833  * wrefresh.
834  */
835 static void
836 place_cursor(int soft)
837 {
838 	int (*touch)(WINDOW *);
839 
840 	if (soft)
841 		touch = wnoutrefresh;
842 	else
843 		touch = wrefresh;
844 
845 	if (in_minibuffer) {
846 		touch(body);
847 		touch(echoarea);
848 	} else {
849 		touch(echoarea);
850 		touch(body);
851 	}
852 }
853 
854 static void
855 redraw_tab(struct tab *tab)
856 {
857 	if (too_small)
858 		return;
859 
860 	if (side_window) {
861 		redraw_help();
862 		wnoutrefresh(help);
863 	}
864 
865 	redraw_tabline();
866 	redraw_body(tab);
867 	redraw_modeline(tab);
868 	redraw_minibuffer();
869 
870 	wnoutrefresh(tabline);
871 	wnoutrefresh(modeline);
872 
873 	if (in_minibuffer == MB_COMPREAD)
874 		wnoutrefresh(minibuffer);
875 
876 	place_cursor(1);
877 
878 	doupdate();
879 
880 	if (set_title)
881 		dprintf(1, "\033]0;%s - Telescope\a",
882 		    current_tab->buffer.page.title);
883 }
884 
885 void
886 start_loading_anim(struct tab *tab)
887 {
888 	if (tab->loading_anim)
889 		return;
890 	tab->loading_anim = 1;
891 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
892 	evtimer_add(&tab->loadingev, &loadingev_timer);
893 }
894 
895 static void
896 update_loading_anim(int fd, short ev, void *d)
897 {
898 	struct tab	*tab = d;
899 
900 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
901 
902 	if (tab == current_tab) {
903 		redraw_modeline(tab);
904 		wrefresh(modeline);
905 		wrefresh(body);
906 		if (in_minibuffer)
907 			wrefresh(echoarea);
908 	}
909 
910 	evtimer_add(&tab->loadingev, &loadingev_timer);
911 }
912 
913 static void
914 stop_loading_anim(struct tab *tab)
915 {
916 	if (!tab->loading_anim)
917 		return;
918 	evtimer_del(&tab->loadingev);
919 	tab->loading_anim = 0;
920 	tab->loading_anim_step = 0;
921 
922 	if (tab != current_tab)
923 		return;
924 
925 	redraw_modeline(tab);
926 
927 	wrefresh(modeline);
928 	wrefresh(body);
929 	if (in_minibuffer)
930 		wrefresh(echoarea);
931 }
932 
933 void
934 load_url_in_tab(struct tab *tab, const char *url, const char *base)
935 {
936 	if (!operating) {
937 		load_url(tab, url, base);
938 		return;
939 	}
940 
941 	message("Loading %s...", url);
942 	start_loading_anim(tab);
943 	load_url(tab, url, base);
944 
945 	redraw_tab(tab);
946 }
947 
948 void
949 switch_to_tab(struct tab *tab)
950 {
951 	current_tab = tab;
952 	tab->flags &= ~TAB_URGENT;
953 
954 	if (operating && tab->flags & TAB_LAZY)
955 		load_url_in_tab(tab, tab->hist_cur->h, NULL);
956 }
957 
958 unsigned int
959 tab_new_id(void)
960 {
961 	return tab_counter++;
962 }
963 
964 struct tab *
965 new_tab(const char *url, const char *base)
966 {
967 	struct tab	*tab;
968 
969 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
970 		event_loopbreak();
971 		return NULL;
972 	}
973 	tab->fd = -1;
974 
975 	TAILQ_INIT(&tab->hist.head);
976 
977 	TAILQ_INIT(&tab->buffer.head);
978 
979 	tab->id = tab_new_id();
980 	if (!operating)
981 		tab->flags |= TAB_LAZY;
982 	switch_to_tab(tab);
983 
984 	if (TAILQ_EMPTY(&tabshead))
985 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
986 	else
987 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
988 
989 	load_url_in_tab(tab, url, base);
990 	return tab;
991 }
992 
993 int
994 ui_print_colors(void)
995 {
996 	int colors = 0, pairs = 0, can_change = 0;
997 	int columns = 16, lines, color, i, j;
998 
999 	initscr();
1000 	if (has_colors()) {
1001 		start_color();
1002 		use_default_colors();
1003 
1004 		colors = COLORS;
1005 		pairs = COLOR_PAIRS;
1006 		can_change = can_change_color();
1007 	}
1008 	endwin();
1009 
1010 	printf("Term info:\n");
1011 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1012 	    getenv("TERM"), colors, pairs, can_change);
1013 	printf("\n");
1014 
1015 	if (colors == 0) {
1016 		printf("No color support\n");
1017 		return 0;
1018 	}
1019 
1020 	printf("Available colors:\n\n");
1021 	lines = (colors - 1) / columns + 1;
1022 	color = 0;
1023 	for (i = 0; i < lines; ++i) {
1024 		for (j = 0; j < columns; ++j, ++color) {
1025 			printf("\033[0;38;5;%dm %03d", color, color);
1026 		}
1027 		printf("\n");
1028 	}
1029 
1030 	printf("\033[0m");
1031 	fflush(stdout);
1032 	return 0;
1033 }
1034 
1035 int
1036 ui_init()
1037 {
1038 	setlocale(LC_ALL, "");
1039 
1040 	minibuffer_init();
1041 
1042 	/* initialize help window */
1043 	TAILQ_INIT(&helpwin.head);
1044 
1045 	base_map = &global_map;
1046 	current_map = &global_map;
1047 
1048 	initscr();
1049 
1050 	if (enable_colors) {
1051 		if (has_colors()) {
1052 			start_color();
1053 			use_default_colors();
1054 		} else
1055 			enable_colors = 0;
1056 	}
1057 
1058 	config_apply_style();
1059 
1060 	raw();
1061 	noecho();
1062 	nonl();
1063 	intrflush(stdscr, FALSE);
1064 
1065 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1066 		return 0;
1067 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1068 		return 0;
1069 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1070 		return 0;
1071 	if ((echoarea = newwin(1, COLS, LINES-1, 0)) == NULL)
1072 		return 0;
1073 	if ((minibuffer = newwin(1, COLS, LINES-1, 0)) == NULL)
1074 		return 0;
1075 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1076 		return 0;
1077 
1078 	body_lines = LINES-3;
1079 	body_cols = COLS;
1080 
1081 	wbkgd(body, body_face.body);
1082 	wbkgd(echoarea, minibuffer_face.background);
1083 
1084 	update_x_offset();
1085 
1086 	keypad(body, TRUE);
1087 	scrollok(body, FALSE);
1088 
1089 	/* non-blocking input */
1090 	wtimeout(body, 0);
1091 
1092 	mvwprintw(body, 0, 0, "");
1093 
1094 	evtimer_set(&resizeev, handle_resize, NULL);
1095 
1096 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1097 	event_add(&stdioev, NULL);
1098 
1099 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1100 	signal_add(&winchev, NULL);
1101 
1102 	return 1;
1103 }
1104 
1105 void
1106 ui_main_loop(void)
1107 {
1108 	operating = 1;
1109 	switch_to_tab(current_tab);
1110 	redraw_tab(current_tab);
1111 
1112 	event_dispatch();
1113 }
1114 
1115 void
1116 ui_on_tab_loaded(struct tab *tab)
1117 {
1118 	stop_loading_anim(tab);
1119 	message("Loaded %s", tab->hist_cur->h);
1120 
1121 	redraw_tabline();
1122 	wrefresh(tabline);
1123 	place_cursor(0);
1124 }
1125 
1126 void
1127 ui_on_tab_refresh(struct tab *tab)
1128 {
1129 	wrap_page(&tab->buffer, body_cols);
1130 	if (tab == current_tab)
1131 		redraw_tab(tab);
1132 	else
1133 		tab->flags |= TAB_URGENT;
1134 }
1135 
1136 const char *
1137 ui_keyname(int k)
1138 {
1139 	return keyname(k);
1140 }
1141 
1142 void
1143 ui_toggle_side_window(void)
1144 {
1145 	side_window = !side_window;
1146 	if (side_window)
1147 		recompute_help();
1148 
1149 	/*
1150 	 * ugly hack, but otherwise the window doesn't get updated
1151 	 * until I call rearrange_windows a second time (e.g. via
1152 	 * C-l).  I will be happy to know why something like this is
1153 	 * needed.
1154 	 */
1155 	rearrange_windows();
1156 	rearrange_windows();
1157 }
1158 
1159 void
1160 ui_schedule_redraw(void)
1161 {
1162 	should_rearrange_windows = 1;
1163 }
1164 
1165 void
1166 ui_require_input(struct tab *tab, int hide)
1167 {
1168 	/* TODO: hard-switching to another tab is ugly */
1169 	switch_to_tab(tab);
1170 
1171 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1172 	    &ir_history, NULL, NULL);
1173 	strlcpy(ministate.prompt, "Input required: ",
1174 	    sizeof(ministate.prompt));
1175 	redraw_tab(tab);
1176 }
1177 
1178 void
1179 ui_after_message_hook(void)
1180 {
1181 	redraw_minibuffer();
1182 	place_cursor(0);
1183 }
1184 
1185 void
1186 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1187     struct tab *data)
1188 {
1189 	yornp(prompt, fn, data);
1190 	redraw_tab(current_tab);
1191 }
1192 
1193 void
1194 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1195     struct tab *data)
1196 {
1197 	minibuffer_read(prompt, fn, data);
1198 	redraw_tab(current_tab);
1199 }
1200 
1201 void
1202 ui_suspend(void)
1203 {
1204 	endwin();
1205 
1206 	kill(getpid(), SIGSTOP);
1207 
1208 	refresh();
1209 	clear();
1210 	rearrange_windows();
1211 }
1212 
1213 void
1214 ui_end(void)
1215 {
1216 	endwin();
1217 }