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Date:: Wed Jul 21 14:43:07 2021 UTC
Message:: move in_minibuffer too
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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 static inline void
114 update_x_offset(void)
115 {
116 	if (olivetti_mode && fill_column < body_cols)
117 		x_offset = (body_cols - fill_column)/2;
118 	else
119 		x_offset = 0;
120 }
121 
122 void
123 save_excursion(struct excursion *place, struct buffer *buffer)
124 {
125 	place->curs_x = buffer->curs_x;
126 	place->curs_y = buffer->curs_y;
127 	place->line_off = buffer->line_off;
128 	place->top_line = buffer->top_line;
129 	place->current_line = buffer->current_line;
130 	place->cpoff = buffer->cpoff;
131 }
132 
133 void
134 restore_excursion(struct excursion *place, struct buffer *buffer)
135 {
136 	buffer->curs_x = place->curs_x;
137 	buffer->curs_y = place->curs_y;
138 	buffer->line_off = place->line_off;
139 	buffer->top_line = place->top_line;
140 	buffer->current_line = place->current_line;
141 	buffer->cpoff = place->cpoff;
142 }
143 
144 static void
145 restore_curs_x(struct buffer *buffer)
146 {
147 	struct vline	*vl;
148 	const char	*prfx, *text;
149 
150 	vl = buffer->current_line;
151 	if (vl == NULL || vl->line == NULL)
152 		buffer->curs_x = buffer->cpoff = 0;
153 	else if (vl->parent->data != NULL) {
154 		text = vl->parent->data;
155 		buffer->curs_x = utf8_snwidth(text + 1, buffer->cpoff) + 1;
156 	} else
157 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
158 
159 	buffer->curs_x += x_offset;
160 
161 	if (vl == NULL)
162 		return;
163 
164 	if (vl->parent->data != NULL)
165 		buffer->curs_x += utf8_swidth_between(vl->parent->line, vl->parent->data);
166 	else {
167 		prfx = line_prefixes[vl->parent->type].prfx1;
168 		buffer->curs_x += utf8_swidth(prfx);
169 	}
170 }
171 
172 void
173 global_key_unbound(void)
174 {
175 	message("%s is undefined", keybuf);
176 }
177 
178 struct buffer *
179 current_buffer(void)
180 {
181 	if (in_minibuffer)
182 		return &ministate.buffer;
183 	return &current_tab->buffer;
184 }
185 
186 static int
187 readkey(void)
188 {
189 	uint32_t state = 0;
190 
191 	if ((thiskey.key = wgetch(body)) == ERR)
192 		return 0;
193 
194 	thiskey.meta = thiskey.key == 27;
195 	if (thiskey.meta) {
196 		thiskey.key = wgetch(body);
197 		if (thiskey.key == ERR || thiskey.key == 27) {
198 			thiskey.meta = 0;
199 			thiskey.key = 27;
200 		}
201 	}
202 
203 	thiskey.cp = 0;
204 	if ((unsigned int)thiskey.key < UINT8_MAX) {
205 		while (1) {
206 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
207 				break;
208 			if ((thiskey.key = wgetch(body)) == ERR) {
209 				message("Error decoding user input");
210 				return 0;
211 			}
212 		}
213 	}
214 
215 	return 1;
216 }
217 
218 static void
219 dispatch_stdio(int fd, short ev, void *d)
220 {
221 	struct keymap	*k;
222 	const char	*keyname;
223 	char		 tmp[5] = {0};
224 
225 	/* TODO: schedule a redraw? */
226 	if (too_small)
227 		return;
228 
229 	if (!readkey())
230 		return;
231 
232 	if (keybuf[0] != '\0')
233 		strlcat(keybuf, " ", sizeof(keybuf));
234 	if (thiskey.meta)
235 		strlcat(keybuf, "M-", sizeof(keybuf));
236 	if (thiskey.cp != 0) {
237 		utf8_encode(thiskey.cp, tmp);
238 		strlcat(keybuf, tmp, sizeof(keybuf));
239 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
240 		strlcat(keybuf, keyname, sizeof(keybuf));
241 	} else {
242 		tmp[0] = thiskey.key;
243 		strlcat(keybuf, tmp, sizeof(keybuf));
244 	}
245 
246 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
247 		if (k->meta == thiskey.meta &&
248 		    k->key == thiskey.key) {
249 			if (k->fn == NULL)
250 				current_map = &k->map;
251 			else {
252 				current_map = base_map;
253 				strlcpy(keybuf, "", sizeof(keybuf));
254 				k->fn(current_buffer());
255 			}
256 			goto done;
257 		}
258 	}
259 
260 	if (current_map->unhandled_input != NULL)
261 		current_map->unhandled_input();
262 	else
263 		global_key_unbound();
264 
265 	strlcpy(keybuf, "", sizeof(keybuf));
266 	current_map = base_map;
267 
268 done:
269 	if (side_window)
270 		recompute_help();
271 
272 	if (should_rearrange_windows)
273 		rearrange_windows();
274 	redraw_tab(current_tab);
275 }
276 
277 static void
278 handle_resize(int sig, short ev, void *d)
279 {
280 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
281 		event_del(&resizeev);
282 	}
283 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
284 	evtimer_add(&resizeev, &resize_timer);
285 }
286 
287 static void
288 handle_resize_nodelay(int s, short ev, void *d)
289 {
290 	endwin();
291 	refresh();
292 	clear();
293 
294 	rearrange_windows();
295 }
296 
297 static void
298 rearrange_windows(void)
299 {
300 	int		 lines;
301 
302 	should_rearrange_windows = 0;
303 
304 	lines = LINES;
305 
306 	if ((too_small = lines < 15)) {
307 		erase();
308 		printw("Window too small.");
309 		refresh();
310 		return;
311 	}
312 
313 	/* move and resize the windows, in reverse order! */
314 
315 	if (in_minibuffer == MB_COMPREAD) {
316 		mvwin(minibuffer, lines-10, 0);
317 		wresize(minibuffer, 10, COLS);
318 		lines -= 10;
319 
320 		wrap_page(&ministate.compl.buffer, COLS);
321 	}
322 
323 	mvwin(echoarea, --lines, 0);
324 	wresize(echoarea, 1, COLS);
325 
326 	mvwin(modeline, --lines, 0);
327 	wresize(modeline, 1, COLS);
328 
329 	body_lines = --lines;
330 	body_cols = COLS;
331 
332 	if (side_window) {
333 		help_cols = 0.3 * COLS;
334 		help_lines = lines;
335 		mvwin(help, 1, 0);
336 		wresize(help, help_lines, help_cols);
337 
338 		wrap_page(&helpwin, help_cols);
339 
340 		body_cols = COLS - help_cols - 1;
341 		mvwin(body, 1, help_cols);
342 	} else
343 		mvwin(body, 1, 0);
344 
345 	update_x_offset();
346 	wresize(body, body_lines, body_cols);
347 
348 	wresize(tabline, 1, COLS);
349 
350 	wrap_page(&current_tab->buffer, body_cols);
351 	redraw_tab(current_tab);
352 }
353 
354 static void
355 line_prefix_and_text(struct vline *vl, char *buf, size_t len,
356     const char **prfx_ret, const char **text_ret)
357 {
358 	int type, i, cont, width;
359 	char *space, *t;
360 
361 	if ((*text_ret = vl->line) == NULL)
362 		*text_ret = "";
363 
364 	cont = vl->flags & L_CONTINUATION;
365 	type = vl->parent->type;
366 	if (!cont)
367 		*prfx_ret = line_prefixes[type].prfx1;
368 	else
369 		*prfx_ret = line_prefixes[type].prfx2;
370 
371 	space = vl->parent->data;
372 	if (!emojify_link || type != LINE_LINK || space == NULL)
373 		return;
374 
375 	if (cont) {
376 		memset(buf, 0, len);
377 		width = utf8_swidth_between(vl->parent->line, space);
378 		for (i = 0; i < width + 1; ++i)
379 			strlcat(buf, " ", len);
380 	} else {
381 		strlcpy(buf, *text_ret, len);
382 		if ((t = strchr(buf, ' ')) != NULL)
383 			*t = '\0';
384 		strlcat(buf, " ", len);
385 
386 		/* skip the emoji */
387                 *text_ret += (space - vl->parent->line) + 1;
388 	}
389 
390 	*prfx_ret = buf;
391 }
392 
393 static inline void
394 print_vline_descr(int width, WINDOW *window, struct vline *vl)
395 {
396 	int x, y, goal;
397 
398 	if (vl->parent->type != LINE_COMPL &&
399 	    vl->parent->type != LINE_COMPL_CURRENT)
400 		return;
401 
402 	if (vl->parent->alt == NULL)
403 		return;
404 
405 	(void)y;
406 	getyx(window, y, x);
407 
408 	goal = width/2;
409 	if (goal <= x)
410 		wprintw(window, " ");
411 	for (; goal > x; ++x)
412 		wprintw(window, " ");
413 
414 	wprintw(window, "%s", vl->parent->alt);
415 }
416 
417 /*
418  * Core part of the rendering.  It prints a vline starting from the
419  * current cursor position.  Printing a vline consists of skipping
420  * `off' columns (for olivetti-mode), print the correct prefix (which
421  * may be the emoji in case of emojified links-lines), printing the
422  * text itself, filling until width - off and filling off columns
423  * again.
424  */
425 static void
426 print_vline(int off, int width, WINDOW *window, struct vline *vl)
427 {
428 	/*
429 	 * Believe me or not, I've seen emoji ten code points long!
430 	 * That means, to stay large, 4*10 bytes + NUL.
431 	 */
432 	char emojibuf[41] = {0};
433 	const char *text, *prfx;
434 	struct line_face *f;
435 	int i, left, x, y;
436 
437 	f = &line_faces[vl->parent->type];
438 
439 	/* unused, set by getyx */
440 	(void)y;
441 
442 	line_prefix_and_text(vl, emojibuf, sizeof(emojibuf), &prfx, &text);
443 
444 	wattr_on(window, body_face.left, NULL);
445 	for (i = 0; i < off; i++)
446 		waddch(window, ' ');
447 	wattr_off(window, body_face.left, NULL);
448 
449 	wattr_on(window, f->prefix, NULL);
450 	wprintw(window, "%s", prfx);
451 	wattr_off(window, f->prefix, NULL);
452 
453 	wattr_on(window, f->text, NULL);
454 	wprintw(window, "%s", text);
455 	print_vline_descr(width, window, vl);
456 	wattr_off(window, f->text, NULL);
457 
458 	getyx(window, y, x);
459 
460 	left = width - x;
461 
462 	wattr_on(window, f->trail, NULL);
463 	for (i = 0; i < left - off; ++i)
464 		waddch(window, ' ');
465 	wattr_off(window, f->trail, NULL);
466 
467 	wattr_on(window, body_face.right, NULL);
468 	for (i = 0; i < off; i++)
469 		waddch(window, ' ');
470 	wattr_off(window, body_face.right, NULL);
471 
472 }
473 
474 static void
475 redraw_tabline(void)
476 {
477 	struct tab	*tab;
478 	size_t		 toskip, ots, tabwidth, space, x;
479 	int		 current, y, truncated, pair;
480 	const char	*title;
481 	char		 buf[25];
482 
483 	x = 0;
484 
485 	/* unused, but setted by a getyx */
486 	(void)y;
487 
488 	tabwidth = sizeof(buf)+1;
489 	space = COLS-2;
490 
491 	toskip = 0;
492 	TAILQ_FOREACH(tab, &tabshead, tabs) {
493 		toskip++;
494 		if (tab == current_tab)
495 			break;
496 	}
497 
498 	if (toskip * tabwidth < space)
499 		toskip = 0;
500 	else {
501 		ots = toskip;
502 		toskip--;
503                 while (toskip != 0 &&
504 		    (ots - toskip+1) * tabwidth < space)
505 			toskip--;
506 	}
507 
508 	werase(tabline);
509 	wattr_on(tabline, tab_face.background, NULL);
510 	wprintw(tabline, toskip == 0 ? " " : "<");
511 	wattr_off(tabline, tab_face.background, NULL);
512 
513 	truncated = 0;
514 	TAILQ_FOREACH(tab, &tabshead, tabs) {
515 		if (truncated)
516 			break;
517 		if (toskip != 0) {
518 			toskip--;
519 			continue;
520 		}
521 
522 		getyx(tabline, y, x);
523 		if (x + sizeof(buf)+2 >= (size_t)COLS)
524 			truncated = 1;
525 
526 		current = tab == current_tab;
527 
528 		if (*(title = tab->buffer.page.title) == '\0')
529 			title = tab->hist_cur->h;
530 
531 		if (tab->flags & TAB_URGENT)
532 			strlcpy(buf, "!", sizeof(buf));
533 		else
534 			strlcpy(buf, " ", sizeof(buf));
535 
536                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
537 			/* truncation happens */
538 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
539 		} else {
540 			/* pad with spaces */
541 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
542 				/* nop */ ;
543 		}
544 
545 		pair = current ? tab_face.current : tab_face.tab;
546 		wattr_on(tabline, pair, NULL);
547 		wprintw(tabline, "%s", buf);
548 		wattr_off(tabline, pair, NULL);
549 
550 		wattr_on(tabline, tab_face.background, NULL);
551 		if (TAILQ_NEXT(tab, tabs) != NULL)
552 			wprintw(tabline, "│");
553 		wattr_off(tabline, tab_face.background, NULL);
554 	}
555 
556 	wattr_on(tabline, tab_face.background, NULL);
557 	for (; x < (size_t)COLS; ++x)
558 		waddch(tabline, ' ');
559 	if (truncated)
560 		mvwprintw(tabline, 0, COLS-1, ">");
561 	wattr_off(tabline, tab_face.background, NULL);
562 }
563 
564 /*
565  * Compute the first visible line around vl.  Try to search forward
566  * until the end of the buffer; if a visible line is not found, search
567  * backward.  Return NULL if no viable line was found.
568  */
569 struct vline *
570 adjust_line(struct vline *vl, struct buffer *buffer)
571 {
572 	struct vline *t;
573 
574 	if (vl == NULL)
575 		return NULL;
576 
577 	if (!(vl->parent->flags & L_HIDDEN))
578 		return vl;
579 
580 	/* search forward */
581 	for (t = vl;
582 	     t != NULL && t->parent->flags & L_HIDDEN;
583 	     t = TAILQ_NEXT(t, vlines))
584 		;		/* nop */
585 
586 	if (t != NULL)
587 		return t;
588 
589 	/* search backward */
590 	for (t = vl;
591 	     t != NULL && t->parent->flags & L_HIDDEN;
592 	     t = TAILQ_PREV(t, vhead, vlines))
593 		;		/* nop */
594 
595 	return t;
596 }
597 
598 static void
599 redraw_window(WINDOW *win, int off, int height, int width, struct buffer *buffer)
600 {
601 	struct vline	*vl;
602 	int		 l, onscreen;
603 
604 	restore_curs_x(buffer);
605 
606 	/*
607 	 * TODO: ignoring buffer->force_update and always
608 	 * re-rendering.  In theory we can recompute the y position
609 	 * without a re-render, and optimize here.  It's not the only
610 	 * optimisation possible here, wscrl wolud also be an
611 	 * interesting one.
612 	 */
613 
614 again:
615 	werase(win);
616 	buffer->curs_y = 0;
617 
618 	if (TAILQ_EMPTY(&buffer->head))
619 		goto end;
620 
621 	if (buffer->top_line == NULL)
622 		buffer->top_line = TAILQ_FIRST(&buffer->head);
623 
624 	buffer->top_line = adjust_line(buffer->top_line, buffer);
625 	if (buffer->top_line == NULL)
626 		goto end;
627 
628 	buffer->current_line = adjust_line(buffer->current_line, buffer);
629 
630 	l = 0;
631 	onscreen = 0;
632 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
633 		if (vl->parent->flags & L_HIDDEN)
634 			continue;
635 
636 		wmove(win, l, 0);
637 		print_vline(off, width, win, vl);
638 
639 		if (vl == buffer->current_line)
640 			onscreen = 1;
641 
642 		if (!onscreen)
643 			buffer->curs_y++;
644 
645 		l++;
646 		if (l == height)
647 			break;
648 	}
649 
650 	if (!onscreen) {
651 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
652 			if (vl == buffer->current_line)
653 				break;
654 			if (vl->parent->flags & L_HIDDEN)
655 				continue;
656 			buffer->line_off++;
657 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
658 		}
659 
660 		if (vl != NULL)
661 			goto again;
662 	}
663 
664 	buffer->last_line_off = buffer->line_off;
665 	buffer->force_redraw = 0;
666 end:
667 	wmove(win, buffer->curs_y, buffer->curs_x);
668 }
669 
670 static void
671 redraw_help(void)
672 {
673 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
674 }
675 
676 static void
677 redraw_body(struct tab *tab)
678 {
679 	static struct tab *last_tab;
680 
681 	if (last_tab != tab)
682 		tab->buffer.force_redraw =1;
683 	last_tab = tab;
684 
685 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
686 }
687 
688 static inline char
689 trust_status_char(enum trust_state ts)
690 {
691 	switch (ts) {
692 	case TS_UNKNOWN:	return '-';
693 	case TS_UNTRUSTED:	return '!';
694 	case TS_TEMP_TRUSTED:	return '!';
695 	case TS_TRUSTED:	return 'v';
696 	case TS_VERIFIED:	return 'V';
697 	default:		return 'X';
698 	}
699 }
700 
701 static void
702 redraw_modeline(struct tab *tab)
703 {
704 	double		 pct;
705 	int		 x, y, max_x, max_y;
706 	const char	*mode = tab->buffer.page.name;
707 	const char	*spin = "-\\|/";
708 
709 	werase(modeline);
710 	wattr_on(modeline, modeline_face.background, NULL);
711 	wmove(modeline, 0, 0);
712 
713 	wprintw(modeline, "-%c%c %s ",
714 	    spin[tab->loading_anim_step],
715 	    trust_status_char(tab->trust),
716 	    mode == NULL ? "(none)" : mode);
717 
718 	pct = (tab->buffer.line_off + tab->buffer.curs_y) * 100.0
719 		/ tab->buffer.line_max;
720 
721 	if (tab->buffer.line_max <= (size_t)body_lines)
722                 wprintw(modeline, "All ");
723 	else if (tab->buffer.line_off == 0)
724                 wprintw(modeline, "Top ");
725 	else if (tab->buffer.line_off + body_lines >= tab->buffer.line_max)
726 		wprintw(modeline, "Bottom ");
727 	else
728 		wprintw(modeline, "%.0f%% ", pct);
729 
730 	wprintw(modeline, "%d/%d %s ",
731 	    tab->buffer.line_off + tab->buffer.curs_y,
732 	    tab->buffer.line_max,
733 	    tab->hist_cur->h);
734 
735 	getyx(modeline, y, x);
736 	getmaxyx(modeline, max_y, max_x);
737 
738 	(void)y;
739 	(void)max_y;
740 
741 	for (; x < max_x; ++x)
742 		waddstr(modeline, "-");
743 
744 	wattr_off(modeline, modeline_face.background, NULL);
745 }
746 
747 static void
748 redraw_minibuffer(void)
749 {
750 	wattr_on(echoarea, minibuffer_face.background, NULL);
751 	werase(echoarea);
752 
753 	if (in_minibuffer)
754 		do_redraw_minibuffer();
755 	else
756 		do_redraw_echoarea();
757 
758 	if (in_minibuffer == MB_COMPREAD)
759 		do_redraw_minibuffer_compl();
760 
761 	wattr_off(echoarea, minibuffer_face.background, NULL);
762 }
763 
764 static void
765 do_redraw_echoarea(void)
766 {
767 	struct vline *vl;
768 
769 	if (ministate.curmesg != NULL)
770                 wprintw(echoarea, "%s", ministate.curmesg);
771 	else if (*keybuf != '\0')
772 		waddstr(echoarea, keybuf);
773 	else {
774 		/* If nothing else, show the URL at point */
775 		vl = current_tab->buffer.current_line;
776 		if (vl != NULL && vl->parent->type == LINE_LINK)
777 			waddstr(echoarea, vl->parent->alt);
778 	}
779 }
780 
781 static void
782 do_redraw_minibuffer(void)
783 {
784 	size_t		 off_y, off_x = 0;
785 	const char	*start, *c;
786 
787 	/* unused, set by getyx */
788 	(void)off_y;
789 
790 	wmove(echoarea, 0, 0);
791 
792 	if (in_minibuffer == MB_COMPREAD)
793 		wprintw(echoarea, "(%2d) ",
794 		    ministate.compl.buffer.line_max);
795 
796 	wprintw(echoarea, "%s", ministate.prompt);
797 	if (ministate.hist_cur != NULL)
798 		wprintw(echoarea, "(%zu/%zu) ",
799 		    ministate.hist_off + 1,
800 		    ministate.history->len);
801 
802 	getyx(echoarea, off_y, off_x);
803 
804 	start = ministate.hist_cur != NULL
805 		? ministate.hist_cur->h
806 		: ministate.buf;
807 	c = utf8_nth(ministate.buffer.current_line->line,
808 	    ministate.buffer.cpoff);
809 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
810 		start = utf8_next_cp(start);
811 	}
812 
813 	waddstr(echoarea, start);
814 
815 	if (ministate.curmesg != NULL)
816 		wprintw(echoarea, " [%s]", ministate.curmesg);
817 
818 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
819 }
820 
821 static void
822 do_redraw_minibuffer_compl(void)
823 {
824 	redraw_window(minibuffer, 0, 10, body_cols,
825 	    &ministate.compl.buffer);
826 }
827 
828 /*
829  * Place the cursor in the right ncurses window.  If soft is 1, use
830  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
831  * wrefresh.
832  */
833 static void
834 place_cursor(int soft)
835 {
836 	int (*touch)(WINDOW *);
837 
838 	if (soft)
839 		touch = wnoutrefresh;
840 	else
841 		touch = wrefresh;
842 
843 	if (in_minibuffer) {
844 		touch(body);
845 		touch(echoarea);
846 	} else {
847 		touch(echoarea);
848 		touch(body);
849 	}
850 }
851 
852 static void
853 redraw_tab(struct tab *tab)
854 {
855 	if (too_small)
856 		return;
857 
858 	if (side_window) {
859 		redraw_help();
860 		wnoutrefresh(help);
861 	}
862 
863 	redraw_tabline();
864 	redraw_body(tab);
865 	redraw_modeline(tab);
866 	redraw_minibuffer();
867 
868 	wnoutrefresh(tabline);
869 	wnoutrefresh(modeline);
870 
871 	if (in_minibuffer == MB_COMPREAD)
872 		wnoutrefresh(minibuffer);
873 
874 	place_cursor(1);
875 
876 	doupdate();
877 
878 	if (set_title)
879 		dprintf(1, "\033]0;%s - Telescope\a",
880 		    current_tab->buffer.page.title);
881 }
882 
883 void
884 start_loading_anim(struct tab *tab)
885 {
886 	if (tab->loading_anim)
887 		return;
888 	tab->loading_anim = 1;
889 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
890 	evtimer_add(&tab->loadingev, &loadingev_timer);
891 }
892 
893 static void
894 update_loading_anim(int fd, short ev, void *d)
895 {
896 	struct tab	*tab = d;
897 
898 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
899 
900 	if (tab == current_tab) {
901 		redraw_modeline(tab);
902 		wrefresh(modeline);
903 		wrefresh(body);
904 		if (in_minibuffer)
905 			wrefresh(echoarea);
906 	}
907 
908 	evtimer_add(&tab->loadingev, &loadingev_timer);
909 }
910 
911 static void
912 stop_loading_anim(struct tab *tab)
913 {
914 	if (!tab->loading_anim)
915 		return;
916 	evtimer_del(&tab->loadingev);
917 	tab->loading_anim = 0;
918 	tab->loading_anim_step = 0;
919 
920 	if (tab != current_tab)
921 		return;
922 
923 	redraw_modeline(tab);
924 
925 	wrefresh(modeline);
926 	wrefresh(body);
927 	if (in_minibuffer)
928 		wrefresh(echoarea);
929 }
930 
931 void
932 load_url_in_tab(struct tab *tab, const char *url, const char *base)
933 {
934 	if (!operating) {
935 		load_url(tab, url, base);
936 		return;
937 	}
938 
939 	message("Loading %s...", url);
940 	start_loading_anim(tab);
941 	load_url(tab, url, base);
942 
943 	redraw_tab(tab);
944 }
945 
946 void
947 switch_to_tab(struct tab *tab)
948 {
949 	current_tab = tab;
950 	tab->flags &= ~TAB_URGENT;
951 
952 	if (operating && tab->flags & TAB_LAZY)
953 		load_url_in_tab(tab, tab->hist_cur->h, NULL);
954 }
955 
956 unsigned int
957 tab_new_id(void)
958 {
959 	return tab_counter++;
960 }
961 
962 struct tab *
963 new_tab(const char *url, const char *base)
964 {
965 	struct tab	*tab;
966 
967 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
968 		event_loopbreak();
969 		return NULL;
970 	}
971 	tab->fd = -1;
972 
973 	TAILQ_INIT(&tab->hist.head);
974 
975 	TAILQ_INIT(&tab->buffer.head);
976 
977 	tab->id = tab_new_id();
978 	if (!operating)
979 		tab->flags |= TAB_LAZY;
980 	switch_to_tab(tab);
981 
982 	if (TAILQ_EMPTY(&tabshead))
983 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
984 	else
985 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
986 
987 	load_url_in_tab(tab, url, base);
988 	return tab;
989 }
990 
991 int
992 ui_print_colors(void)
993 {
994 	int colors = 0, pairs = 0, can_change = 0;
995 	int columns = 16, lines, color, i, j;
996 
997 	initscr();
998 	if (has_colors()) {
999 		start_color();
1000 		use_default_colors();
1001 
1002 		colors = COLORS;
1003 		pairs = COLOR_PAIRS;
1004 		can_change = can_change_color();
1005 	}
1006 	endwin();
1007 
1008 	printf("Term info:\n");
1009 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1010 	    getenv("TERM"), colors, pairs, can_change);
1011 	printf("\n");
1012 
1013 	if (colors == 0) {
1014 		printf("No color support\n");
1015 		return 0;
1016 	}
1017 
1018 	printf("Available colors:\n\n");
1019 	lines = (colors - 1) / columns + 1;
1020 	color = 0;
1021 	for (i = 0; i < lines; ++i) {
1022 		for (j = 0; j < columns; ++j, ++color) {
1023 			printf("\033[0;38;5;%dm %03d", color, color);
1024 		}
1025 		printf("\n");
1026 	}
1027 
1028 	printf("\033[0m");
1029 	fflush(stdout);
1030 	return 0;
1031 }
1032 
1033 int
1034 ui_init()
1035 {
1036 	setlocale(LC_ALL, "");
1037 
1038 	minibuffer_init();
1039 
1040 	/* initialize help window */
1041 	TAILQ_INIT(&helpwin.head);
1042 
1043 	base_map = &global_map;
1044 	current_map = &global_map;
1045 
1046 	initscr();
1047 
1048 	if (enable_colors) {
1049 		if (has_colors()) {
1050 			start_color();
1051 			use_default_colors();
1052 		} else
1053 			enable_colors = 0;
1054 	}
1055 
1056 	config_apply_style();
1057 
1058 	raw();
1059 	noecho();
1060 	nonl();
1061 	intrflush(stdscr, FALSE);
1062 
1063 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1064 		return 0;
1065 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1066 		return 0;
1067 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1068 		return 0;
1069 	if ((echoarea = newwin(1, COLS, LINES-1, 0)) == NULL)
1070 		return 0;
1071 	if ((minibuffer = newwin(1, COLS, LINES-1, 0)) == NULL)
1072 		return 0;
1073 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1074 		return 0;
1075 
1076 	body_lines = LINES-3;
1077 	body_cols = COLS;
1078 
1079 	wbkgd(body, body_face.body);
1080 	wbkgd(echoarea, minibuffer_face.background);
1081 
1082 	update_x_offset();
1083 
1084 	keypad(body, TRUE);
1085 	scrollok(body, FALSE);
1086 
1087 	/* non-blocking input */
1088 	wtimeout(body, 0);
1089 
1090 	mvwprintw(body, 0, 0, "");
1091 
1092 	evtimer_set(&resizeev, handle_resize, NULL);
1093 
1094 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1095 	event_add(&stdioev, NULL);
1096 
1097 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1098 	signal_add(&winchev, NULL);
1099 
1100 	return 1;
1101 }
1102 
1103 void
1104 ui_main_loop(void)
1105 {
1106 	operating = 1;
1107 	switch_to_tab(current_tab);
1108 	redraw_tab(current_tab);
1109 
1110 	event_dispatch();
1111 }
1112 
1113 void
1114 ui_on_tab_loaded(struct tab *tab)
1115 {
1116 	stop_loading_anim(tab);
1117 	message("Loaded %s", tab->hist_cur->h);
1118 
1119 	redraw_tabline();
1120 	wrefresh(tabline);
1121 	place_cursor(0);
1122 }
1123 
1124 void
1125 ui_on_tab_refresh(struct tab *tab)
1126 {
1127 	wrap_page(&tab->buffer, body_cols);
1128 	if (tab == current_tab)
1129 		redraw_tab(tab);
1130 	else
1131 		tab->flags |= TAB_URGENT;
1132 }
1133 
1134 const char *
1135 ui_keyname(int k)
1136 {
1137 	return keyname(k);
1138 }
1139 
1140 void
1141 ui_toggle_side_window(void)
1142 {
1143 	side_window = !side_window;
1144 	if (side_window)
1145 		recompute_help();
1146 
1147 	/*
1148 	 * ugly hack, but otherwise the window doesn't get updated
1149 	 * until I call rearrange_windows a second time (e.g. via
1150 	 * C-l).  I will be happy to know why something like this is
1151 	 * needed.
1152 	 */
1153 	rearrange_windows();
1154 	rearrange_windows();
1155 }
1156 
1157 void
1158 ui_schedule_redraw(void)
1159 {
1160 	should_rearrange_windows = 1;
1161 }
1162 
1163 void
1164 ui_require_input(struct tab *tab, int hide)
1165 {
1166 	/* TODO: hard-switching to another tab is ugly */
1167 	switch_to_tab(tab);
1168 
1169 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1170 	    &ir_history, NULL, NULL);
1171 	strlcpy(ministate.prompt, "Input required: ",
1172 	    sizeof(ministate.prompt));
1173 	redraw_tab(tab);
1174 }
1175 
1176 void
1177 ui_after_message_hook(void)
1178 {
1179 	redraw_minibuffer();
1180 	place_cursor(0);
1181 }
1182 
1183 void
1184 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1185     struct tab *data)
1186 {
1187 	yornp(prompt, fn, data);
1188 	redraw_tab(current_tab);
1189 }
1190 
1191 void
1192 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1193     struct tab *data)
1194 {
1195 	minibuffer_read(prompt, fn, data);
1196 	redraw_tab(current_tab);
1197 }
1198 
1199 void
1200 ui_suspend(void)
1201 {
1202 	endwin();
1203 
1204 	kill(getpid(), SIGSTOP);
1205 
1206 	refresh();
1207 	clear();
1208 	rearrange_windows();
1209 }
1210 
1211 void
1212 ui_end(void)
1213 {
1214 	endwin();
1215 }