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Date:: Thu Jul 15 14:35:39 2021 UTC
Message:: add -C/--colors: dumps all available colors
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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 <assert.h>
34 #include <curses.h>
35 #include <event.h>
36 #include <locale.h>
37 #include <signal.h>
38 #include <stdarg.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 
43 #include "defaults.h"
44 #include "minibuffer.h"
45 #include "telescope.h"
46 #include "ui.h"
47 #include "utf8.h"
48 
49 static struct event	stdioev, winchev;
50 
51 static void		 restore_curs_x(struct buffer *);
52 
53 static struct vline	*nth_line(struct buffer*, size_t);
54 static int		 readkey(void);
55 static void		 dispatch_stdio(int, short, void*);
56 static void		 handle_clear_echoarea(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 int		 wrap_page(struct buffer*, int);
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		 emit_help_item(char*, void*);
74 static void		 rec_compute_help(struct kmap*, char*, size_t);
75 static void		 recompute_help(void);
76 static void		 update_loading_anim(int, short, void*);
77 static void		 stop_loading_anim(struct tab*);
78 
79 static int		 should_rearrange_windows;
80 static int		 too_small;
81 static int		 x_offset;
82 
83 struct thiskey thiskey;
84 
85 static struct event	resizeev;
86 static struct timeval	resize_timer = { 0, 250000 };
87 
88 static WINDOW	*tabline, *body, *modeline, *echoarea, *minibuffer;
89 
90 int			 body_lines, body_cols;
91 
92 static WINDOW		*help;
93 static struct buffer	 helpwin;
94 static int		 help_lines, help_cols;
95 
96 static int		 side_window;
97 
98 static struct event	clechoev;
99 static struct timeval	clechoev_timer = { 5, 0 };
100 static struct timeval	loadingev_timer = { 0, 250000 };
101 
102 static uint32_t		 tab_counter;
103 
104 static char	keybuf[64];
105 
106 struct kmap global_map,
107 	minibuffer_map,
108 	*current_map,
109 	*base_map;
110 
111 int in_minibuffer;
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->current_line = buffer->current_line;
129 	place->cpoff = buffer->cpoff;
130 }
131 
132 void
133 restore_excursion(struct excursion *place, struct buffer *buffer)
134 {
135 	buffer->curs_x = place->curs_x;
136 	buffer->curs_y = place->curs_y;
137 	buffer->line_off = place->line_off;
138 	buffer->current_line = place->current_line;
139 	buffer->cpoff = place->cpoff;
140 }
141 
142 static void
143 restore_curs_x(struct buffer *buffer)
144 {
145 	struct vline	*vl;
146 	const char	*prfx;
147 
148 	vl = buffer->current_line;
149 	if (vl == NULL || vl->line == NULL)
150 		buffer->curs_x = buffer->cpoff = 0;
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 		prfx = line_prefixes[vl->parent->type].prfx1;
158 		buffer->curs_x += utf8_swidth(prfx);
159 	}
160 }
161 
162 void
163 global_key_unbound(void)
164 {
165 	message("%s is undefined", keybuf);
166 }
167 
168 static struct vline *
169 nth_line(struct buffer *buffer, size_t n)
170 {
171 	struct vline	*vl;
172 	size_t		 i;
173 
174 	i = 0;
175 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
176 		if (i == n)
177 			return vl;
178 		i++;
179 	}
180 
181 	/* unreachable */
182 	abort();
183 }
184 
185 struct tab *
186 current_tab(void)
187 {
188 	struct tab *t;
189 
190 	TAILQ_FOREACH(t, &tabshead, tabs) {
191 		if (t->flags & TAB_CURRENT)
192 			return t;
193 	}
194 
195 	/* unreachable */
196 	abort();
197 }
198 
199 struct buffer *
200 current_buffer(void)
201 {
202 	if (in_minibuffer)
203 		return &ministate.buffer;
204 	return &current_tab()->buffer;
205 }
206 
207 static int
208 readkey(void)
209 {
210 	uint32_t state = 0;
211 
212 	if ((thiskey.key = wgetch(body)) == ERR)
213 		return 0;
214 
215 	thiskey.meta = thiskey.key == 27;
216 	if (thiskey.meta) {
217 		thiskey.key = wgetch(body);
218 		if (thiskey.key == ERR || thiskey.key == 27) {
219 			thiskey.meta = 0;
220 			thiskey.key = 27;
221 		}
222 	}
223 
224 	thiskey.cp = 0;
225 	if ((unsigned int)thiskey.key < UINT8_MAX) {
226 		while (1) {
227 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
228 				break;
229 			if ((thiskey.key = wgetch(body)) == ERR) {
230 				message("Error decoding user input");
231 				return 0;
232 			}
233 		}
234 	}
235 
236 	return 1;
237 }
238 
239 static void
240 dispatch_stdio(int fd, short ev, void *d)
241 {
242 	struct keymap	*k;
243 	const char	*keyname;
244 	char		 tmp[5] = {0};
245 
246 	/* TODO: schedule a redraw? */
247 	if (too_small)
248 		return;
249 
250 	if (!readkey())
251 		return;
252 
253 	if (keybuf[0] != '\0')
254 		strlcat(keybuf, " ", sizeof(keybuf));
255 	if (thiskey.meta)
256 		strlcat(keybuf, "M-", sizeof(keybuf));
257 	if (thiskey.cp != 0) {
258 		utf8_encode(thiskey.cp, tmp);
259 		strlcat(keybuf, tmp, sizeof(keybuf));
260 	} else if ((keyname = unkbd(thiskey.key)) != NULL) {
261 		strlcat(keybuf, keyname, sizeof(keybuf));
262 	} else {
263 		tmp[0] = thiskey.key;
264 		strlcat(keybuf, tmp, sizeof(keybuf));
265 	}
266 
267 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
268 		if (k->meta == thiskey.meta &&
269 		    k->key == thiskey.key) {
270 			if (k->fn == NULL)
271 				current_map = &k->map;
272 			else {
273 				current_map = base_map;
274 				strlcpy(keybuf, "", sizeof(keybuf));
275 				k->fn(current_buffer());
276 			}
277 			goto done;
278 		}
279 	}
280 
281 	if (current_map->unhandled_input != NULL)
282 		current_map->unhandled_input();
283 	else
284 		global_key_unbound();
285 
286 	strlcpy(keybuf, "", sizeof(keybuf));
287 	current_map = base_map;
288 
289 done:
290 	if (side_window)
291 		recompute_help();
292 
293 	if (should_rearrange_windows)
294 		rearrange_windows();
295 	redraw_tab(current_tab());
296 }
297 
298 static void
299 handle_clear_echoarea(int fd, short ev, void *d)
300 {
301 	free(ministate.curmesg);
302 	ministate.curmesg = NULL;
303 
304 	redraw_minibuffer();
305 	place_cursor(0);
306 }
307 
308 static void
309 handle_resize(int sig, short ev, void *d)
310 {
311 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
312 		event_del(&resizeev);
313 	}
314 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
315 	evtimer_add(&resizeev, &resize_timer);
316 }
317 
318 static void
319 handle_resize_nodelay(int s, short ev, void *d)
320 {
321 	endwin();
322 	refresh();
323 	clear();
324 
325 	rearrange_windows();
326 }
327 
328 static void
329 rearrange_windows(void)
330 {
331 	struct tab	*tab;
332 	int		 lines;
333 
334 	should_rearrange_windows = 0;
335 
336 	lines = LINES;
337 
338 	if ((too_small = lines < 15)) {
339 		erase();
340 		printw("Window too small.");
341 		refresh();
342 		return;
343 	}
344 
345 	/* move and resize the windows, in reverse order! */
346 
347 	if (in_minibuffer == MB_COMPREAD) {
348 		mvwin(minibuffer, lines-10, 0);
349 		wresize(minibuffer, 10, COLS);
350 		lines -= 10;
351 
352 		wrap_page(&ministate.compl.buffer, COLS);
353 	}
354 
355 	mvwin(echoarea, --lines, 0);
356 	wresize(echoarea, 1, COLS);
357 
358 	mvwin(modeline, --lines, 0);
359 	wresize(modeline, 1, COLS);
360 
361 	body_lines = --lines;
362 	body_cols = COLS;
363 
364 	if (side_window) {
365 		help_cols = 0.3 * COLS;
366 		help_lines = lines;
367 		mvwin(help, 1, 0);
368 		wresize(help, help_lines, help_cols);
369 
370 		wrap_page(&helpwin, help_cols);
371 
372 		body_cols = COLS - help_cols - 1;
373 		mvwin(body, 1, help_cols);
374 	} else
375 		mvwin(body, 1, 0);
376 
377 	update_x_offset();
378 	wresize(body, body_lines, body_cols);
379 
380 	wresize(tabline, 1, COLS);
381 
382 	tab = current_tab();
383 
384 	wrap_page(&tab->buffer, body_cols);
385 	redraw_tab(tab);
386 }
387 
388 static int
389 wrap_page(struct buffer *buffer, int width)
390 {
391 	struct line		*l;
392 	const struct line	*top_orig, *orig;
393 	struct vline		*vl;
394 	int			 pre_width;
395 	const char		*prfx;
396 
397 	top_orig = buffer->top_line == NULL ? NULL : buffer->top_line->parent;
398 	orig = buffer->current_line == NULL ? NULL : buffer->current_line->parent;
399 
400 	buffer->top_line = NULL;
401 	buffer->current_line = NULL;
402 
403 	buffer->force_redraw = 1;
404 	buffer->curs_y = 0;
405 	buffer->line_off = 0;
406 
407 	empty_vlist(buffer);
408 
409 	TAILQ_FOREACH(l, &buffer->page.head, lines) {
410 		prfx = line_prefixes[l->type].prfx1;
411 		switch (l->type) {
412 		case LINE_TEXT:
413 		case LINE_LINK:
414 		case LINE_TITLE_1:
415 		case LINE_TITLE_2:
416 		case LINE_TITLE_3:
417 		case LINE_ITEM:
418 		case LINE_QUOTE:
419 		case LINE_PRE_START:
420 		case LINE_PRE_END:
421 			wrap_text(buffer, prfx, l, MIN(fill_column, width));
422 			break;
423 		case LINE_PRE_CONTENT:
424 			if (olivetti_mode)
425 				pre_width = MIN(fill_column, width);
426 			else
427 				pre_width = width;
428 			hardwrap_text(buffer, l, pre_width);
429 			break;
430 		case LINE_COMPL:
431 		case LINE_COMPL_CURRENT:
432 			wrap_one(buffer, prfx, l, width);
433 			break;
434 		}
435 
436 		if (top_orig == l && buffer->top_line == NULL) {
437 			buffer->line_off = buffer->line_max-1;
438 			buffer->top_line = TAILQ_LAST(&buffer->head, vhead);
439 
440 			while (1) {
441 				vl = TAILQ_PREV(buffer->top_line, vhead, vlines);
442 				if (vl == NULL || vl->parent != orig)
443 					break;
444 				buffer->top_line = vl;
445 				buffer->line_off--;
446 			}
447 		}
448 
449 		if (orig == l && buffer->current_line == NULL) {
450 			buffer->current_line = TAILQ_LAST(&buffer->head, vhead);
451 
452 			while (1) {
453 				vl = TAILQ_PREV(buffer->current_line, vhead, vlines);
454 				if (vl == NULL || vl->parent != orig)
455 					break;
456 				buffer->current_line = vl;
457 			}
458 		}
459 	}
460 
461         if (buffer->current_line == NULL)
462 		buffer->current_line = TAILQ_FIRST(&buffer->head);
463 
464 	if (buffer->top_line == NULL)
465 		buffer->top_line = buffer->current_line;
466 
467 	return 1;
468 }
469 
470 static void
471 print_vline(int off, int width, WINDOW *window, struct vline *vl)
472 {
473 	const char *text;
474 	const char *prfx;
475 	struct line_face *f;
476 	int i, left, x, y;
477 
478 	f = &line_faces[vl->parent->type];
479 
480 	/* unused, set by getyx */
481 	(void)y;
482 
483 	if (!vl->flags)
484 		prfx = line_prefixes[vl->parent->type].prfx1;
485 	else
486 		prfx = line_prefixes[vl->parent->type].prfx2;
487 
488 	text = vl->line;
489 	if (text == NULL)
490 		text = "";
491 
492 	wattr_on(window, body_face.left, NULL);
493 	for (i = 0; i < off; i++)
494 		waddch(window, ' ');
495 	wattr_off(window, body_face.left, NULL);
496 
497 	wattr_on(window, f->prefix, NULL);
498 	wprintw(window, "%s", prfx);
499 	wattr_off(window, f->prefix, NULL);
500 
501 	wattr_on(window, f->text, NULL);
502 	wprintw(window, "%s", text);
503 	wattr_off(window, f->text, NULL);
504 
505 	getyx(window, y, x);
506 
507 	left = width - x;
508 
509 	wattr_on(window, f->trail, NULL);
510 	for (i = 0; i < left - off; ++i)
511 		waddch(window, ' ');
512 	wattr_off(window, f->trail, NULL);
513 
514 	wattr_on(window, body_face.right, NULL);
515 	for (i = 0; i < off; i++)
516 		waddch(window, ' ');
517 	wattr_off(window, body_face.right, NULL);
518 
519 }
520 
521 static void
522 redraw_tabline(void)
523 {
524 	struct tab	*tab;
525 	size_t		 toskip, ots, tabwidth, space, x;
526 	int		 current, y, truncated;
527 	const char	*title;
528 	char		 buf[25];
529 
530 	x = 0;
531 
532 	/* unused, but setted by a getyx */
533 	(void)y;
534 
535 	tabwidth = sizeof(buf)+1;
536 	space = COLS-2;
537 
538 	toskip = 0;
539 	TAILQ_FOREACH(tab, &tabshead, tabs) {
540 		toskip++;
541 		if (tab->flags & TAB_CURRENT)
542 			break;
543 	}
544 
545 	if (toskip * tabwidth < space)
546 		toskip = 0;
547 	else {
548 		ots = toskip;
549 		toskip--;
550                 while (toskip != 0 &&
551 		    (ots - toskip+1) * tabwidth < space)
552 			toskip--;
553 	}
554 
555 	werase(tabline);
556 	wattr_on(tabline, tab_face.background, NULL);
557 	wprintw(tabline, toskip == 0 ? " " : "<");
558 	wattr_off(tabline, tab_face.background, NULL);
559 
560 	truncated = 0;
561 	TAILQ_FOREACH(tab, &tabshead, tabs) {
562 		if (truncated)
563 			break;
564 		if (toskip != 0) {
565 			toskip--;
566 			continue;
567 		}
568 
569 		getyx(tabline, y, x);
570 		if (x + sizeof(buf)+2 >= (size_t)COLS)
571 			truncated = 1;
572 
573 		current = tab->flags & TAB_CURRENT;
574 
575 		if (*(title = tab->buffer.page.title) == '\0')
576 			title = tab->hist_cur->h;
577 
578 		if (tab->flags & TAB_URGENT)
579 			strlcpy(buf, "!", sizeof(buf));
580 		else
581 			strlcpy(buf, " ", sizeof(buf));
582 
583                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
584 			/* truncation happens */
585 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
586 		} else {
587 			/* pad with spaces */
588 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
589 				/* nop */ ;
590 		}
591 
592 		if (current)
593 			wattr_on(tabline, tab_face.current, NULL);
594 		else
595 			wattr_on(tabline, tab_face.tab, NULL);
596 
597 		wprintw(tabline, "%s", buf);
598 		if (TAILQ_NEXT(tab, tabs) != NULL)
599 			wprintw(tabline, " ");
600 
601 		if (current)
602 			wattr_off(tabline, tab_face.current, NULL);
603 		else
604 			wattr_off(tabline, tab_face.tab, NULL);
605 	}
606 
607 	wattr_on(tabline, tab_face.background, NULL);
608 	for (; x < (size_t)COLS; ++x)
609 		waddch(tabline, ' ');
610 	if (truncated)
611 		mvwprintw(tabline, 0, COLS-1, ">");
612 	wattr_off(tabline, tab_face.background, NULL);
613 }
614 
615 /*
616  * Compute the first visible line around vl.  Try to search forward
617  * until the end of the buffer; if a visible line is not found, search
618  * backward.  Return NULL if no viable line was found.
619  */
620 struct vline *
621 adjust_line(struct vline *vl, struct buffer *buffer)
622 {
623 	struct vline *t;
624 
625 	if (vl == NULL)
626 		return NULL;
627 
628 	if (!(vl->parent->flags & L_HIDDEN))
629 		return vl;
630 
631 	/* search forward */
632 	for (t = vl;
633 	     t != NULL && t->parent->flags & L_HIDDEN;
634 	     t = TAILQ_NEXT(t, vlines))
635 		;		/* nop */
636 
637 	if (t != NULL)
638 		return t;
639 
640 	/* search backward */
641 	for (t = vl;
642 	     t != NULL && t->parent->flags & L_HIDDEN;
643 	     t = TAILQ_PREV(t, vhead, vlines))
644 		;		/* nop */
645 
646 	return t;
647 }
648 
649 static void
650 redraw_window(WINDOW *win, int off, int height, int width, struct buffer *buffer)
651 {
652         struct vline	*vl;
653 	int		 l, onscreen;
654 
655 	restore_curs_x(buffer);
656 
657 	/*
658 	 * TODO: ignoring buffer->force_update and always
659 	 * re-rendering.  In theory we can recompute the y position
660 	 * without a re-render, and optimize here.  It's not the only
661 	 * optimisation possible here, wscrl wolud also be an
662 	 * interesting one.
663 	 */
664 
665 again:
666 	werase(win);
667 	buffer->curs_y = 0;
668 
669 	if (TAILQ_EMPTY(&buffer->head))
670 		goto end;
671 
672 	if (buffer->top_line == NULL)
673 		buffer->top_line = TAILQ_FIRST(&buffer->head);
674 
675 	buffer->top_line = adjust_line(buffer->top_line, buffer);
676 	if (buffer->top_line == NULL)
677 		goto end;
678 
679 	buffer->current_line = adjust_line(buffer->current_line, buffer);
680 
681 	l = 0;
682 	onscreen = 0;
683 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
684 		if (vl->parent->flags & L_HIDDEN)
685 			continue;
686 
687 		wmove(win, l, 0);
688 		print_vline(off, width, win, vl);
689 
690 		if (vl == buffer->current_line)
691 			onscreen = 1;
692 
693 		if (!onscreen)
694 			buffer->curs_y++;
695 
696 		l++;
697 		if (l == height)
698 			break;
699 	}
700 
701 	if (!onscreen) {
702 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
703 			if (vl == buffer->current_line)
704 				break;
705 			if (vl->parent->flags & L_HIDDEN)
706 				continue;
707 			buffer->line_off++;
708 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
709 		}
710 
711 		if (vl != NULL)
712 			goto again;
713 	}
714 
715 	buffer->last_line_off = buffer->line_off;
716 	buffer->force_redraw = 0;
717 end:
718 	wmove(win, buffer->curs_y, buffer->curs_x);
719 }
720 
721 static void
722 redraw_help(void)
723 {
724 	redraw_window(help, 0, help_lines, help_cols, &helpwin);
725 }
726 
727 static void
728 redraw_body(struct tab *tab)
729 {
730 	static struct tab *last_tab;
731 
732 	if (last_tab != tab)
733 		tab->buffer.force_redraw =1;
734 	last_tab = tab;
735 
736 	redraw_window(body, x_offset, body_lines, body_cols, &tab->buffer);
737 }
738 
739 static inline char
740 trust_status_char(enum trust_state ts)
741 {
742 	switch (ts) {
743 	case TS_UNKNOWN:	return 'u';
744 	case TS_UNTRUSTED:	return '!';
745 	case TS_TEMP_TRUSTED:	return '!';
746 	case TS_TRUSTED:	return 'v';
747 	case TS_VERIFIED:	return 'V';
748 	default:		return 'X';
749 	}
750 }
751 
752 static void
753 redraw_modeline(struct tab *tab)
754 {
755 	double		 pct;
756 	int		 x, y, max_x, max_y;
757 	const char	*mode = tab->buffer.page.name;
758 	const char	*spin = "-\\|/";
759 
760 	werase(modeline);
761 	wattr_on(modeline, modeline_face.background, NULL);
762 	wmove(modeline, 0, 0);
763 
764 	wprintw(modeline, "-%c%c %s ",
765 	    spin[tab->loading_anim_step],
766 	    trust_status_char(tab->trust),
767 	    mode == NULL ? "(none)" : mode);
768 
769 	pct = (tab->buffer.line_off + tab->buffer.curs_y) * 100.0
770 		/ tab->buffer.line_max;
771 
772 	if (tab->buffer.line_max <= (size_t)body_lines)
773                 wprintw(modeline, "All ");
774 	else if (tab->buffer.line_off == 0)
775                 wprintw(modeline, "Top ");
776 	else if (tab->buffer.line_off + body_lines >= tab->buffer.line_max)
777 		wprintw(modeline, "Bottom ");
778 	else
779 		wprintw(modeline, "%.0f%% ", pct);
780 
781 	wprintw(modeline, "%d/%d %s ",
782 	    tab->buffer.line_off + tab->buffer.curs_y,
783 	    tab->buffer.line_max,
784 	    tab->hist_cur->h);
785 
786 	getyx(modeline, y, x);
787 	getmaxyx(modeline, max_y, max_x);
788 
789 	(void)y;
790 	(void)max_y;
791 
792 	for (; x < max_x; ++x)
793 		waddstr(modeline, "-");
794 
795 	wattr_off(modeline, modeline_face.background, NULL);
796 }
797 
798 static void
799 redraw_minibuffer(void)
800 {
801 	wattr_on(echoarea, minibuffer_face.background, NULL);
802 	werase(echoarea);
803 
804 	if (in_minibuffer)
805 		do_redraw_minibuffer();
806 	else
807 		do_redraw_echoarea();
808 
809 	if (in_minibuffer == MB_COMPREAD)
810 		do_redraw_minibuffer_compl();
811 
812 	wattr_off(echoarea, minibuffer_face.background, NULL);
813 }
814 
815 static void
816 do_redraw_echoarea(void)
817 {
818 	struct tab *tab;
819 
820 	if (ministate.curmesg != NULL)
821                 wprintw(echoarea, "%s", ministate.curmesg);
822 	else if (*keybuf != '\0')
823 		waddstr(echoarea, keybuf);
824 	else {
825 		/* If nothing else, show the URL at point */
826 		tab = current_tab();
827 		if (tab->buffer.current_line != NULL &&
828 		    tab->buffer.current_line->parent->type == LINE_LINK)
829 			waddstr(echoarea,
830 			    tab->buffer.current_line->parent->meta.alt);
831 	}
832 }
833 
834 static void
835 do_redraw_minibuffer(void)
836 {
837 	size_t		 off_y, off_x = 0;
838 	const char	*start, *c;
839 
840 	/* unused, set by getyx */
841 	(void)off_y;
842 
843 	mvwprintw(echoarea, 0, 0, "%s", ministate.prompt);
844 	if (ministate.hist_cur != NULL)
845 		wprintw(echoarea, "(%zu/%zu) ",
846 		    ministate.hist_off + 1,
847 		    ministate.history->len);
848 
849 	getyx(echoarea, off_y, off_x);
850 
851 	start = ministate.hist_cur != NULL
852 		? ministate.hist_cur->h
853 		: ministate.buf;
854 	c = utf8_nth(ministate.buffer.current_line->line,
855 	    ministate.buffer.cpoff);
856 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
857 		start = utf8_next_cp(start);
858 	}
859 
860 	waddstr(echoarea, start);
861 
862 	if (ministate.curmesg != NULL)
863 		wprintw(echoarea, " [%s]", ministate.curmesg);
864 
865 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
866 }
867 
868 static void
869 do_redraw_minibuffer_compl(void)
870 {
871 	redraw_window(minibuffer, 0, 10, body_cols,
872 	    &ministate.compl.buffer);
873 }
874 
875 /*
876  * Place the cursor in the right ncurses window.  If soft is 1, use
877  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
878  * wrefresh.
879  */
880 static void
881 place_cursor(int soft)
882 {
883 	int (*touch)(WINDOW *);
884 
885 	if (soft)
886 		touch = wnoutrefresh;
887 	else
888 		touch = wrefresh;
889 
890 	if (in_minibuffer) {
891 		touch(body);
892 		touch(echoarea);
893 	} else {
894 		touch(echoarea);
895 		touch(body);
896 	}
897 }
898 
899 static void
900 redraw_tab(struct tab *tab)
901 {
902 	if (too_small)
903 		return;
904 
905 	if (side_window) {
906 		redraw_help();
907 		wnoutrefresh(help);
908 	}
909 
910 	redraw_tabline();
911 	redraw_body(tab);
912 	redraw_modeline(tab);
913 	redraw_minibuffer();
914 
915 	wnoutrefresh(tabline);
916 	wnoutrefresh(modeline);
917 
918 	if (in_minibuffer == MB_COMPREAD)
919 		wnoutrefresh(minibuffer);
920 
921 	place_cursor(1);
922 
923 	doupdate();
924 }
925 
926 static void
927 emit_help_item(char *prfx, void *fn)
928 {
929 	struct line	*l;
930 	struct cmd	*cmd;
931 
932 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
933 		if (fn == cmd->fn)
934 			break;
935 	}
936 	assert(cmd != NULL);
937 
938 	if ((l = calloc(1, sizeof(*l))) == NULL)
939 		abort();
940 
941 	l->type = LINE_TEXT;
942 	l->meta.alt = NULL;
943 
944 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
945 
946 	if (TAILQ_EMPTY(&helpwin.page.head))
947 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
948 	else
949 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
950 }
951 
952 static void
953 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
954 {
955 	struct keymap	*k;
956 	char		 p[32];
957 	const char	*kn;
958 
959 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
960 		strlcpy(p, prfx, sizeof(p));
961 		if (*p != '\0')
962 			strlcat(p, " ", sizeof(p));
963 		if (k->meta)
964 			strlcat(p, "M-", sizeof(p));
965 		if ((kn = unkbd(k->key)) != NULL)
966 			strlcat(p, kn, sizeof(p));
967 		else
968 			strlcat(p, keyname(k->key), sizeof(p));
969 
970 		if (k->fn == NULL)
971 			rec_compute_help(&k->map, p, sizeof(p));
972 		else
973 			emit_help_item(p, k->fn);
974 	}
975 }
976 
977 static void
978 recompute_help(void)
979 {
980 	char	p[32] = { 0 };
981 
982 	empty_vlist(&helpwin);
983 	empty_linelist(&helpwin);
984 	rec_compute_help(current_map, p, sizeof(p));
985 	wrap_page(&helpwin, help_cols);
986 }
987 
988 void
989 vmessage(const char *fmt, va_list ap)
990 {
991 	if (evtimer_pending(&clechoev, NULL))
992 		evtimer_del(&clechoev);
993 
994 	free(ministate.curmesg);
995 	ministate.curmesg = NULL;
996 
997 	if (fmt != NULL) {
998 		evtimer_set(&clechoev, handle_clear_echoarea, NULL);
999 		evtimer_add(&clechoev, &clechoev_timer);
1000 
1001 		/* TODO: what to do if the allocation fails here? */
1002 		if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1003 			ministate.curmesg = NULL;
1004 	}
1005 
1006 	redraw_minibuffer();
1007         place_cursor(0);
1008 }
1009 
1010 void
1011 message(const char *fmt, ...)
1012 {
1013 	va_list ap;
1014 
1015 	va_start(ap, fmt);
1016 	vmessage(fmt, ap);
1017 	va_end(ap);
1018 }
1019 
1020 void
1021 start_loading_anim(struct tab *tab)
1022 {
1023 	if (tab->loading_anim)
1024 		return;
1025 	tab->loading_anim = 1;
1026 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1027 	evtimer_add(&tab->loadingev, &loadingev_timer);
1028 }
1029 
1030 static void
1031 update_loading_anim(int fd, short ev, void *d)
1032 {
1033 	struct tab	*tab = d;
1034 
1035 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1036 
1037 	if (tab->flags & TAB_CURRENT) {
1038 		redraw_modeline(tab);
1039 		wrefresh(modeline);
1040 		wrefresh(body);
1041 		if (in_minibuffer)
1042 			wrefresh(echoarea);
1043 	}
1044 
1045 	evtimer_add(&tab->loadingev, &loadingev_timer);
1046 }
1047 
1048 static void
1049 stop_loading_anim(struct tab *tab)
1050 {
1051 	if (!tab->loading_anim)
1052 		return;
1053 	evtimer_del(&tab->loadingev);
1054 	tab->loading_anim = 0;
1055 	tab->loading_anim_step = 0;
1056 
1057 	if (!(tab->flags & TAB_CURRENT))
1058 		return;
1059 
1060 	redraw_modeline(tab);
1061 
1062 	wrefresh(modeline);
1063 	wrefresh(body);
1064 	if (in_minibuffer)
1065 		wrefresh(echoarea);
1066 }
1067 
1068 void
1069 load_url_in_tab(struct tab *tab, const char *url)
1070 {
1071 	message("Loading %s...", url);
1072 	start_loading_anim(tab);
1073 	load_url(tab, url);
1074 
1075 	tab->buffer.curs_x = 0;
1076 	tab->buffer.curs_y = 0;
1077 	redraw_tab(tab);
1078 }
1079 
1080 void
1081 switch_to_tab(struct tab *tab)
1082 {
1083 	struct tab	*t;
1084 
1085 	TAILQ_FOREACH(t, &tabshead, tabs) {
1086 		t->flags &= ~TAB_CURRENT;
1087 	}
1088 
1089 	tab->flags |= TAB_CURRENT;
1090 	tab->flags &= ~TAB_URGENT;
1091 }
1092 
1093 unsigned int
1094 tab_new_id(void)
1095 {
1096 	return tab_counter++;
1097 }
1098 
1099 struct tab *
1100 new_tab(const char *url)
1101 {
1102 	struct tab	*tab;
1103 
1104 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1105 		event_loopbreak();
1106 		return NULL;
1107 	}
1108 	tab->fd = -1;
1109 
1110 	TAILQ_INIT(&tab->hist.head);
1111 
1112 	TAILQ_INIT(&tab->buffer.head);
1113 
1114 	tab->id = tab_new_id();
1115 	switch_to_tab(tab);
1116 
1117 	if (TAILQ_EMPTY(&tabshead))
1118 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1119 	else
1120 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1121 
1122 	load_url_in_tab(tab, url);
1123 	return tab;
1124 }
1125 
1126 int
1127 ui_print_colors(void)
1128 {
1129 	int colors = 0, pairs = 0, can_change = 0;
1130 	int columns = 16, lines, color, i, j;
1131 
1132 	initscr();
1133 	if (has_colors()) {
1134 		start_color();
1135 		use_default_colors();
1136 
1137 		colors = COLORS;
1138 		pairs = COLOR_PAIRS;
1139 		can_change = can_change_color();
1140 	}
1141 	endwin();
1142 
1143 	printf("Term info:\n");
1144 	printf("TERM=%s COLORS=%d COLOR_PAIRS=%d can_change_colors=%d\n",
1145 	    getenv("TERM"), colors, pairs, can_change);
1146 	printf("\n");
1147 
1148 	if (colors == 0) {
1149 		printf("No color support\n");
1150 		return 0;
1151 	}
1152 
1153 	printf("Available colors:\n\n");
1154 	lines = (colors - 1) / columns + 1;
1155 	color = 0;
1156 	for (i = 0; i < lines; ++i) {
1157 		for (j = 0; j < columns; ++j, ++color) {
1158 			printf("\033[0;38;5;%dm %03d", color, color);
1159 		}
1160 		printf("\n");
1161 	}
1162 
1163 	printf("\033[0m");
1164 	fflush(stdout);
1165 	return 0;
1166 }
1167 
1168 int
1169 ui_init()
1170 {
1171 	setlocale(LC_ALL, "");
1172 
1173 	TAILQ_INIT(&eecmd_history.head);
1174 	TAILQ_INIT(&ir_history.head);
1175 	TAILQ_INIT(&lu_history.head);
1176 
1177 	ministate.line.type = LINE_TEXT;
1178 	ministate.vline.parent = &ministate.line;
1179 	ministate.buffer.current_line = &ministate.vline;
1180 
1181 	/* initialize help window */
1182 	TAILQ_INIT(&helpwin.head);
1183 
1184 	base_map = &global_map;
1185 	current_map = &global_map;
1186 
1187 	initscr();
1188 
1189 	if (enable_colors) {
1190 		if (has_colors()) {
1191 			start_color();
1192 			use_default_colors();
1193 		} else
1194 			enable_colors = 0;
1195 	}
1196 
1197 	config_apply_style();
1198 
1199 	raw();
1200 	noecho();
1201 	nonl();
1202 	intrflush(stdscr, FALSE);
1203 
1204 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1205 		return 0;
1206 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1207 		return 0;
1208 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1209 		return 0;
1210 	if ((echoarea = newwin(1, COLS, LINES-1, 0)) == NULL)
1211 		return 0;
1212 	if ((minibuffer = newwin(1, COLS, LINES-1, 0)) == NULL)
1213 		return 0;
1214 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1215 		return 0;
1216 
1217 	body_lines = LINES-3;
1218 	body_cols = COLS;
1219 
1220 	wbkgd(body, body_face.body);
1221 	wbkgd(echoarea, minibuffer_face.background);
1222 
1223 	update_x_offset();
1224 
1225 	keypad(body, TRUE);
1226 	scrollok(body, FALSE);
1227 
1228 	/* non-blocking input */
1229 	wtimeout(body, 0);
1230 
1231 	mvwprintw(body, 0, 0, "");
1232 
1233 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1234 	event_add(&stdioev, NULL);
1235 
1236 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1237 	signal_add(&winchev, NULL);
1238 
1239 	return 1;
1240 }
1241 
1242 void
1243 ui_on_tab_loaded(struct tab *tab)
1244 {
1245 	stop_loading_anim(tab);
1246 	message("Loaded %s", tab->hist_cur->h);
1247 
1248 	redraw_tabline();
1249 	wrefresh(tabline);
1250 	place_cursor(0);
1251 }
1252 
1253 void
1254 ui_on_tab_refresh(struct tab *tab)
1255 {
1256 	wrap_page(&tab->buffer, body_cols);
1257 	if (tab->flags & TAB_CURRENT)
1258 		redraw_tab(tab);
1259 	else
1260 		tab->flags |= TAB_URGENT;
1261 }
1262 
1263 const char *
1264 ui_keyname(int k)
1265 {
1266 	return keyname(k);
1267 }
1268 
1269 void
1270 ui_toggle_side_window(void)
1271 {
1272 	side_window = !side_window;
1273 	if (side_window)
1274 		recompute_help();
1275 
1276 	/*
1277 	 * ugly hack, but otherwise the window doesn't get updated
1278 	 * until I call rearrange_windows a second time (e.g. via
1279 	 * C-l).  I will be happy to know why something like this is
1280 	 * needed.
1281 	 */
1282 	rearrange_windows();
1283 	rearrange_windows();
1284 }
1285 
1286 void
1287 ui_schedule_redraw(void)
1288 {
1289 	should_rearrange_windows = 1;
1290 }
1291 
1292 void
1293 ui_require_input(struct tab *tab, int hide)
1294 {
1295 	/* TODO: hard-switching to another tab is ugly */
1296 	switch_to_tab(tab);
1297 
1298 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1299 	    &ir_history, NULL, NULL);
1300 	strlcpy(ministate.prompt, "Input required: ",
1301 	    sizeof(ministate.prompt));
1302 	redraw_tab(tab);
1303 }
1304 
1305 void
1306 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1307     struct tab *data)
1308 {
1309 	yornp(prompt, fn, data);
1310 	redraw_tab(current_tab());
1311 }
1312 
1313 void
1314 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1315     struct tab *data)
1316 {
1317 	completing_read(prompt, fn, data);
1318 	redraw_tab(current_tab());
1319 }
1320 
1321 void
1322 ui_end(void)
1323 {
1324 	endwin();
1325 }