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