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Date:: Tue Jul 13 15:47:58 2021 UTC
Message:: move defaults.c decls. to their own header
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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 int		 wrap_page(struct buffer*, int);
60 static void		 print_vline(int, int, WINDOW*, struct vline*);
61 static void		 redraw_tabline(void);
62 static void		 redraw_window(WINDOW*, int, int, struct buffer*);
63 static void		 redraw_help(void);
64 static void		 redraw_body(struct tab*);
65 static void		 redraw_modeline(struct tab*);
66 static void		 redraw_minibuffer(void);
67 static void		 do_redraw_echoarea(void);
68 static void		 do_redraw_minibuffer(void);
69 static void		 place_cursor(int);
70 static void		 redraw_tab(struct tab*);
71 static void		 emit_help_item(char*, void*);
72 static void		 rec_compute_help(struct kmap*, char*, size_t);
73 static void		 recompute_help(void);
74 static void		 update_loading_anim(int, short, void*);
75 static void		 stop_loading_anim(struct tab*);
76 
77 static int		 x_offset;
78 
79 struct thiskey thiskey;
80 
81 static struct event	resizeev;
82 static struct timeval	resize_timer = { 0, 250000 };
83 
84 static WINDOW	*tabline, *body, *modeline, *echoarea;
85 
86 int			 body_lines, body_cols;
87 
88 static WINDOW		*help;
89 static struct buffer	 helpwin;
90 static int		 help_lines, help_cols;
91 
92 static int		 side_window;
93 
94 static struct event	clechoev;
95 static struct timeval	clechoev_timer = { 5, 0 };
96 static struct timeval	loadingev_timer = { 0, 250000 };
97 
98 static uint32_t		 tab_counter;
99 
100 static char	keybuf[64];
101 
102 struct kmap global_map,
103 	minibuffer_map,
104 	*current_map,
105 	*base_map;
106 
107 int in_minibuffer;
108 
109 static inline void
110 update_x_offset(void)
111 {
112 	if (olivetti_mode && fill_column < body_cols)
113 		x_offset = (body_cols - fill_column)/2;
114 	else
115 		x_offset = 0;
116 }
117 
118 void
119 save_excursion(struct excursion *place, struct buffer *buffer)
120 {
121 	place->curs_x = buffer->curs_x;
122 	place->curs_y = buffer->curs_y;
123 	place->line_off = buffer->line_off;
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->current_line = place->current_line;
135 	buffer->cpoff = place->cpoff;
136 }
137 
138 static void
139 restore_curs_x(struct buffer *buffer)
140 {
141 	struct vline	*vl;
142 	const char	*prfx;
143 
144 	vl = buffer->current_line;
145 	if (vl == NULL || vl->line == NULL)
146 		buffer->curs_x = buffer->cpoff = 0;
147 	else
148 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
149 
150 	buffer->curs_x += x_offset;
151 
152 	if (vl != NULL) {
153 		prfx = line_prefixes[vl->parent->type].prfx1;
154 		buffer->curs_x += utf8_swidth(prfx);
155 	}
156 }
157 
158 void
159 global_key_unbound(void)
160 {
161 	message("%s is undefined", keybuf);
162 }
163 
164 static struct vline *
165 nth_line(struct buffer *buffer, size_t n)
166 {
167 	struct vline	*vl;
168 	size_t		 i;
169 
170 	i = 0;
171 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
172 		if (i == n)
173 			return vl;
174 		i++;
175 	}
176 
177 	/* unreachable */
178 	abort();
179 }
180 
181 struct tab *
182 current_tab(void)
183 {
184 	struct tab *t;
185 
186 	TAILQ_FOREACH(t, &tabshead, tabs) {
187 		if (t->flags & TAB_CURRENT)
188 			return t;
189 	}
190 
191 	/* unreachable */
192 	abort();
193 }
194 
195 struct buffer *
196 current_buffer(void)
197 {
198 	if (in_minibuffer)
199 		return &ministate.buffer;
200 	return &current_tab()->buffer;
201 }
202 
203 static int
204 readkey(void)
205 {
206 	uint32_t state = 0;
207 
208 	if ((thiskey.key = wgetch(body)) == ERR)
209 		return 0;
210 
211 	thiskey.meta = thiskey.key == 27;
212 	if (thiskey.meta) {
213 		thiskey.key = wgetch(body);
214 		if (thiskey.key == ERR || thiskey.key == 27) {
215 			thiskey.meta = 0;
216 			thiskey.key = 27;
217 		}
218 	}
219 
220 	thiskey.cp = 0;
221 	if ((unsigned int)thiskey.key < UINT8_MAX) {
222 		while (1) {
223 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
224 				break;
225 			if ((thiskey.key = wgetch(body)) == ERR) {
226 				message("Error decoding user input");
227 				return 0;
228 			}
229 		}
230 	}
231 
232 	return 1;
233 }
234 
235 static void
236 dispatch_stdio(int fd, short ev, void *d)
237 {
238 	struct keymap	*k;
239 	const char	*keyname;
240 	char		 tmp[5] = {0};
241 
242 	if (!readkey())
243 		return;
244 
245 	if (keybuf[0] != '\0')
246 		strlcat(keybuf, " ", sizeof(keybuf));
247 	if (thiskey.meta)
248 		strlcat(keybuf, "M-", sizeof(keybuf));
249 	if (thiskey.cp != 0) {
250 		utf8_encode(thiskey.cp, tmp);
251 		strlcat(keybuf, tmp, sizeof(keybuf));
252 	} else {
253 		if ((keyname = unkbd(thiskey.key)) != NULL)
254 			strlcat(keybuf, keyname, sizeof(keybuf));
255 		else {
256 			tmp[0] = thiskey.key;
257 			strlcat(keybuf, tmp, sizeof(keybuf));
258 		}
259 	}
260 
261 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
262 		if (k->meta == thiskey.meta &&
263 		    k->key == thiskey.key) {
264 			if (k->fn == NULL)
265 				current_map = &k->map;
266 			else {
267 				current_map = base_map;
268 				strlcpy(keybuf, "", sizeof(keybuf));
269 				k->fn(current_buffer());
270 			}
271 			goto done;
272 		}
273 	}
274 
275 	if (current_map->unhandled_input != NULL)
276 		current_map->unhandled_input();
277 	else
278 		global_key_unbound();
279 
280 	strlcpy(keybuf, "", sizeof(keybuf));
281 	current_map = base_map;
282 
283 done:
284 	if (side_window)
285 		recompute_help();
286 
287 	redraw_tab(current_tab());
288 }
289 
290 static void
291 handle_clear_echoarea(int fd, short ev, void *d)
292 {
293 	free(ministate.curmesg);
294 	ministate.curmesg = NULL;
295 
296 	redraw_minibuffer();
297 	place_cursor(0);
298 }
299 
300 static void
301 handle_resize(int sig, short ev, void *d)
302 {
303 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
304 		event_del(&resizeev);
305 	}
306 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
307 	evtimer_add(&resizeev, &resize_timer);
308 }
309 
310 static void
311 handle_resize_nodelay(int s, short ev, void *d)
312 {
313 	struct tab	*tab;
314 
315 	endwin();
316 	refresh();
317 	clear();
318 
319 	/* move and resize the windows, in reverse order! */
320 
321 	mvwin(echoarea, LINES-1, 0);
322 	wresize(echoarea, 1, COLS);
323 
324 	mvwin(modeline, LINES-2, 0);
325 	wresize(modeline, 1, COLS);
326 
327 	body_lines = LINES-3;
328 	body_cols = COLS;
329 
330 	if (side_window) {
331 		help_cols = 0.3 * COLS;
332 		help_lines = LINES-3;
333 		mvwin(help, 1, 0);
334 		wresize(help, help_lines, help_cols);
335 
336 		wrap_page(&helpwin, help_cols);
337 
338 		body_cols = COLS - help_cols - 1;
339 		mvwin(body, 1, help_cols);
340 	} else
341 		mvwin(body, 1, 0);
342 
343 	update_x_offset();
344 	wresize(body, body_lines, body_cols);
345 
346 	wresize(tabline, 1, COLS);
347 
348 	tab = current_tab();
349 
350 	wrap_page(&tab->buffer, body_cols);
351 	redraw_tab(tab);
352 }
353 
354 static int
355 wrap_page(struct buffer *buffer, int width)
356 {
357 	struct line		*l;
358 	const struct line	*top_orig, *orig;
359 	struct vline		*vl;
360 	int			 pre_width;
361 	const char		*prfx;
362 
363 	top_orig = buffer->top_line == NULL ? NULL : buffer->top_line->parent;
364 	orig = buffer->current_line == NULL ? NULL : buffer->current_line->parent;
365 
366 	buffer->top_line = NULL;
367 	buffer->current_line = NULL;
368 
369 	buffer->force_redraw = 1;
370 	buffer->curs_y = 0;
371 	buffer->line_off = 0;
372 
373 	empty_vlist(buffer);
374 
375 	TAILQ_FOREACH(l, &buffer->page.head, lines) {
376 		prfx = line_prefixes[l->type].prfx1;
377 		switch (l->type) {
378 		case LINE_TEXT:
379 		case LINE_LINK:
380 		case LINE_TITLE_1:
381 		case LINE_TITLE_2:
382 		case LINE_TITLE_3:
383 		case LINE_ITEM:
384 		case LINE_QUOTE:
385 		case LINE_PRE_START:
386 		case LINE_PRE_END:
387 			wrap_text(buffer, prfx, l, MIN(fill_column, width));
388 			break;
389 		case LINE_PRE_CONTENT:
390 			if (olivetti_mode)
391 				pre_width = MIN(fill_column, width);
392 			else
393 				pre_width = width;
394 			hardwrap_text(buffer, l, pre_width);
395 			break;
396 		}
397 
398 		if (top_orig == l && buffer->top_line == NULL) {
399 			buffer->line_off = buffer->line_max-1;
400 			buffer->top_line = TAILQ_LAST(&buffer->head, vhead);
401 
402 			while (1) {
403 				vl = TAILQ_PREV(buffer->top_line, vhead, vlines);
404 				if (vl == NULL || vl->parent != orig)
405 					break;
406 				buffer->top_line = vl;
407 				buffer->line_off--;
408 			}
409 		}
410 
411 		if (orig == l && buffer->current_line == NULL) {
412 			buffer->current_line = TAILQ_LAST(&buffer->head, vhead);
413 
414 			while (1) {
415 				vl = TAILQ_PREV(buffer->current_line, vhead, vlines);
416 				if (vl == NULL || vl->parent != orig)
417 					break;
418 				buffer->current_line = vl;
419 			}
420 		}
421 	}
422 
423         if (buffer->current_line == NULL)
424 		buffer->current_line = TAILQ_FIRST(&buffer->head);
425 
426 	if (buffer->top_line == NULL)
427 		buffer->top_line = buffer->current_line;
428 
429 	return 1;
430 }
431 
432 static void
433 print_vline(int off, int width, WINDOW *window, struct vline *vl)
434 {
435 	const char *text;
436 	const char *prfx;
437 	struct line_face *f;
438 	int i, left, x, y;
439 
440 	f = &line_faces[vl->parent->type];
441 
442 	/* unused, set by getyx */
443 	(void)y;
444 
445 	if (!vl->flags)
446 		prfx = line_prefixes[vl->parent->type].prfx1;
447 	else
448 		prfx = line_prefixes[vl->parent->type].prfx2;
449 
450 	text = vl->line;
451 	if (text == NULL)
452 		text = "";
453 
454 	wattr_on(window, body_face.left, NULL);
455 	for (i = 0; i < off; i++)
456 		waddch(window, ' ');
457 	wattr_off(window, body_face.left, NULL);
458 
459 	wattr_on(window, f->prefix, NULL);
460 	wprintw(window, "%s", prfx);
461 	wattr_off(window, f->prefix, NULL);
462 
463 	wattr_on(window, f->text, NULL);
464 	wprintw(window, "%s", text);
465 	wattr_off(window, f->text, NULL);
466 
467 	getyx(window, y, x);
468 
469 	left = width - x;
470 
471 	wattr_on(window, f->trail, NULL);
472 	for (i = 0; i < left - off; ++i)
473 		waddch(window, ' ');
474 	wattr_off(window, f->trail, NULL);
475 
476 	wattr_on(window, body_face.right, NULL);
477 	for (i = 0; i < off; i++)
478 		waddch(window, ' ');
479 	wattr_off(window, body_face.right, NULL);
480 
481 }
482 
483 static void
484 redraw_tabline(void)
485 {
486 	struct tab	*tab;
487 	size_t		 toskip, ots, tabwidth, space, x;
488 	int		 current, y, truncated;
489 	const char	*title;
490 	char		 buf[25];
491 
492 	x = 0;
493 
494 	/* unused, but setted by a getyx */
495 	(void)y;
496 
497 	tabwidth = sizeof(buf)+1;
498 	space = COLS-2;
499 
500 	toskip = 0;
501 	TAILQ_FOREACH(tab, &tabshead, tabs) {
502 		toskip++;
503 		if (tab->flags & TAB_CURRENT)
504 			break;
505 	}
506 
507 	if (toskip * tabwidth < space)
508 		toskip = 0;
509 	else {
510 		ots = toskip;
511 		toskip--;
512                 while (toskip != 0 &&
513 		    (ots - toskip+1) * tabwidth < space)
514 			toskip--;
515 	}
516 
517 	werase(tabline);
518 	wattr_on(tabline, tab_face.background, NULL);
519 	wprintw(tabline, toskip == 0 ? " " : "<");
520 	wattr_off(tabline, tab_face.background, NULL);
521 
522 	truncated = 0;
523 	TAILQ_FOREACH(tab, &tabshead, tabs) {
524 		if (truncated)
525 			break;
526 		if (toskip != 0) {
527 			toskip--;
528 			continue;
529 		}
530 
531 		getyx(tabline, y, x);
532 		if (x + sizeof(buf)+2 >= (size_t)COLS)
533 			truncated = 1;
534 
535 		current = tab->flags & TAB_CURRENT;
536 
537 		if (*(title = tab->buffer.page.title) == '\0')
538 			title = tab->hist_cur->h;
539 
540 		if (tab->flags & TAB_URGENT)
541 			strlcpy(buf, "!", sizeof(buf));
542 		else
543 			strlcpy(buf, " ", sizeof(buf));
544 
545                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
546 			/* truncation happens */
547 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
548 		} else {
549 			/* pad with spaces */
550 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
551 				/* nop */ ;
552 		}
553 
554 		if (current)
555 			wattr_on(tabline, tab_face.current, NULL);
556 		else
557 			wattr_on(tabline, tab_face.tab, NULL);
558 
559 		wprintw(tabline, "%s", buf);
560 		if (TAILQ_NEXT(tab, tabs) != NULL)
561 			wprintw(tabline, " ");
562 
563 		if (current)
564 			wattr_off(tabline, tab_face.current, NULL);
565 		else
566 			wattr_off(tabline, tab_face.tab, NULL);
567 	}
568 
569 	wattr_on(tabline, tab_face.background, NULL);
570 	for (; x < (size_t)COLS; ++x)
571 		waddch(tabline, ' ');
572 	if (truncated)
573 		mvwprintw(tabline, 0, COLS-1, ">");
574 	wattr_off(tabline, tab_face.background, NULL);
575 }
576 
577 /*
578  * Compute the first visible line around vl.  Try to search forward
579  * until the end of the buffer; if a visible line is not found, search
580  * backward.  Return NULL if no viable line was found.
581  */
582 static inline struct vline *
583 adjust_line(struct vline *vl, struct buffer *buffer)
584 {
585 	struct vline *t;
586 
587 	if (!(vl->parent->flags & L_HIDDEN))
588 		return vl;
589 
590 	/* search forward */
591 	for (t = vl;
592 	     t != NULL && t->parent->flags & L_HIDDEN;
593 	     t = TAILQ_NEXT(t, vlines))
594 		;		/* nop */
595 
596 	if (t != NULL)
597 		return t;
598 
599 	/* search backward */
600 	for (t = vl;
601 	     t != NULL && t->parent->flags & L_HIDDEN;
602 	     t = TAILQ_PREV(t, vhead, vlines))
603 		;		/* nop */
604 
605 	return t;
606 }
607 
608 static void
609 redraw_window(WINDOW *win, int height, int width, struct buffer *buffer)
610 {
611         struct vline	*vl;
612 	int		 l, onscreen;
613 
614 	restore_curs_x(buffer);
615 
616 	/*
617 	 * TODO: ignoring buffer->force_update and always
618 	 * re-rendering.  In theory we can recompute the y position
619 	 * without a re-render, and optimize here.  It's not the only
620 	 * optimisation possible here, wscrl wolud also be an
621 	 * interesting one.
622 	 */
623 
624 again:
625 	werase(win);
626 	buffer->curs_y = 0;
627 
628 	if (TAILQ_EMPTY(&buffer->head))
629 		goto end;
630 
631 	buffer->top_line = adjust_line(buffer->top_line, buffer);
632 	if (buffer->top_line == NULL)
633 		goto end;
634 
635 	buffer->current_line = adjust_line(buffer->current_line, buffer);
636 
637 	l = 0;
638 	onscreen = 0;
639 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
640 		if (vl->parent->flags & L_HIDDEN)
641 			continue;
642 
643 		wmove(win, l, 0);
644 		print_vline(x_offset, width, win, vl);
645 
646 		if (vl == buffer->current_line)
647 			onscreen = 1;
648 
649 		if (!onscreen)
650 			buffer->curs_y++;
651 
652 		l++;
653 		if (l == height)
654 			break;
655 	}
656 
657 	if (!onscreen) {
658 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
659 			if (vl == buffer->current_line)
660 				break;
661 			if (vl->parent->flags & L_HIDDEN)
662 				continue;
663 			buffer->line_off++;
664 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
665 		}
666 
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, 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, 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 'u';
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 	double		 pct;
711 	int		 x, y, max_x, max_y;
712 	const char	*mode = tab->buffer.page.name;
713 	const char	*spin = "-\\|/";
714 
715 	werase(modeline);
716 	wattr_on(modeline, modeline_face.background, NULL);
717 	wmove(modeline, 0, 0);
718 
719 	wprintw(modeline, "-%c%c %s ",
720 	    spin[tab->loading_anim_step],
721 	    trust_status_char(tab->trust),
722 	    mode == NULL ? "(none)" : mode);
723 
724 	pct = (tab->buffer.line_off + tab->buffer.curs_y) * 100.0 / tab->buffer.line_max;
725 
726 	if (tab->buffer.line_max <= (size_t)body_lines)
727                 wprintw(modeline, "All ");
728 	else if (tab->buffer.line_off == 0)
729                 wprintw(modeline, "Top ");
730 	else if (tab->buffer.line_off + body_lines >= tab->buffer.line_max)
731 		wprintw(modeline, "Bottom ");
732 	else
733 		wprintw(modeline, "%.0f%% ", pct);
734 
735 	wprintw(modeline, "%d/%d %s ",
736 	    tab->buffer.line_off + tab->buffer.curs_y,
737 	    tab->buffer.line_max,
738 	    tab->hist_cur->h);
739 
740 	getyx(modeline, y, x);
741 	getmaxyx(modeline, max_y, max_x);
742 
743 	(void)y;
744 	(void)max_y;
745 
746 	for (; x < max_x; ++x)
747 		waddstr(modeline, "-");
748 
749 	wattr_off(modeline, modeline_face.background, NULL);
750 }
751 
752 static void
753 redraw_minibuffer(void)
754 {
755 	wattr_on(echoarea, minibuffer_face.background, NULL);
756 	werase(echoarea);
757 
758 	if (in_minibuffer)
759 		do_redraw_minibuffer();
760 	else
761 		do_redraw_echoarea();
762 
763 	wattr_off(echoarea, minibuffer_face.background, NULL);
764 }
765 
766 static void
767 do_redraw_echoarea(void)
768 {
769 	struct tab *tab;
770 
771 	if (ministate.curmesg != NULL)
772                 wprintw(echoarea, "%s", ministate.curmesg);
773 	else if (*keybuf != '\0')
774 		waddstr(echoarea, keybuf);
775 	else {
776 		/* If nothing else, show the URL at point */
777 		tab = current_tab();
778 		if (tab->buffer.current_line != NULL &&
779 		    tab->buffer.current_line->parent->type == LINE_LINK)
780 			waddstr(echoarea, tab->buffer.current_line->parent->alt);
781 	}
782 }
783 
784 static void
785 do_redraw_minibuffer(void)
786 {
787 	size_t		 off_y, off_x = 0;
788 	const char	*start, *c;
789 
790 	/* unused, set by getyx */
791 	(void)off_y;
792 
793 	mvwprintw(echoarea, 0, 0, "%s", ministate.prompt);
794 	if (ministate.hist_cur != NULL)
795 		wprintw(echoarea, "(%zu/%zu) ",
796 		    ministate.hist_off + 1,
797 		    ministate.history->len);
798 
799 	getyx(echoarea, off_y, off_x);
800 
801 	start = ministate.hist_cur != NULL
802 		? ministate.hist_cur->h
803 		: ministate.buf;
804 	c = utf8_nth(ministate.buffer.current_line->line,
805 	    ministate.buffer.cpoff);
806 	while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
807 		start = utf8_next_cp(start);
808 	}
809 
810 	waddstr(echoarea, start);
811 
812 	if (ministate.curmesg != NULL)
813 		wprintw(echoarea, " [%s]", ministate.curmesg);
814 
815 	wmove(echoarea, 0, off_x + utf8_swidth_between(start, c));
816 }
817 
818 /*
819  * Place the cursor in the right ncurses window.  If soft is 1, use
820  * wnoutrefresh (which shouldn't cause any I/O); otherwise use
821  * wrefresh.
822  */
823 static void
824 place_cursor(int soft)
825 {
826 	int (*touch)(WINDOW *);
827 
828 	if (soft)
829 		touch = wnoutrefresh;
830 	else
831 		touch = wrefresh;
832 
833 	if (in_minibuffer) {
834 		touch(body);
835 		touch(echoarea);
836 	} else {
837 		touch(echoarea);
838 		touch(body);
839 	}
840 }
841 
842 static void
843 redraw_tab(struct tab *tab)
844 {
845 	if (side_window) {
846 		redraw_help();
847 		wnoutrefresh(help);
848 	}
849 
850 	redraw_tabline();
851 	redraw_body(tab);
852 	redraw_modeline(tab);
853 	redraw_minibuffer();
854 
855 	wnoutrefresh(tabline);
856 	wnoutrefresh(modeline);
857 
858 	place_cursor(1);
859 
860 	doupdate();
861 }
862 
863 static void
864 emit_help_item(char *prfx, void *fn)
865 {
866 	struct line	*l;
867 	struct cmd	*cmd;
868 
869 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
870 		if (fn == cmd->fn)
871 			break;
872 	}
873 	assert(cmd != NULL);
874 
875 	if ((l = calloc(1, sizeof(*l))) == NULL)
876 		abort();
877 
878 	l->type = LINE_TEXT;
879 	l->alt = NULL;
880 
881 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
882 
883 	if (TAILQ_EMPTY(&helpwin.page.head))
884 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
885 	else
886 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
887 }
888 
889 static void
890 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
891 {
892 	struct keymap	*k;
893 	char		 p[32];
894 	const char	*kn;
895 
896 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
897 		strlcpy(p, prfx, sizeof(p));
898 		if (*p != '\0')
899 			strlcat(p, " ", sizeof(p));
900 		if (k->meta)
901 			strlcat(p, "M-", sizeof(p));
902 		if ((kn = unkbd(k->key)) != NULL)
903 			strlcat(p, kn, sizeof(p));
904 		else
905 			strlcat(p, keyname(k->key), sizeof(p));
906 
907 		if (k->fn == NULL)
908 			rec_compute_help(&k->map, p, sizeof(p));
909 		else
910 			emit_help_item(p, k->fn);
911 	}
912 }
913 
914 static void
915 recompute_help(void)
916 {
917 	char	p[32] = { 0 };
918 
919 	empty_vlist(&helpwin);
920 	empty_linelist(&helpwin);
921 	rec_compute_help(current_map, p, sizeof(p));
922 	wrap_page(&helpwin, help_cols);
923 }
924 
925 void
926 vmessage(const char *fmt, va_list ap)
927 {
928 	if (evtimer_pending(&clechoev, NULL))
929 		evtimer_del(&clechoev);
930 
931 	free(ministate.curmesg);
932 	ministate.curmesg = NULL;
933 
934 	if (fmt != NULL) {
935 		evtimer_set(&clechoev, handle_clear_echoarea, NULL);
936 		evtimer_add(&clechoev, &clechoev_timer);
937 
938 		/* TODO: what to do if the allocation fails here? */
939 		if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
940 			ministate.curmesg = NULL;
941 	}
942 
943 	redraw_minibuffer();
944         place_cursor(0);
945 }
946 
947 void
948 message(const char *fmt, ...)
949 {
950 	va_list ap;
951 
952 	va_start(ap, fmt);
953 	vmessage(fmt, ap);
954 	va_end(ap);
955 }
956 
957 void
958 start_loading_anim(struct tab *tab)
959 {
960 	if (tab->loading_anim)
961 		return;
962 	tab->loading_anim = 1;
963 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
964 	evtimer_add(&tab->loadingev, &loadingev_timer);
965 }
966 
967 static void
968 update_loading_anim(int fd, short ev, void *d)
969 {
970 	struct tab	*tab = d;
971 
972 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
973 
974 	if (tab->flags & TAB_CURRENT) {
975 		redraw_modeline(tab);
976 		wrefresh(modeline);
977 		wrefresh(body);
978 		if (in_minibuffer)
979 			wrefresh(echoarea);
980 	}
981 
982 	evtimer_add(&tab->loadingev, &loadingev_timer);
983 }
984 
985 static void
986 stop_loading_anim(struct tab *tab)
987 {
988 	if (!tab->loading_anim)
989 		return;
990 	evtimer_del(&tab->loadingev);
991 	tab->loading_anim = 0;
992 	tab->loading_anim_step = 0;
993 
994 	if (!(tab->flags & TAB_CURRENT))
995 		return;
996 
997 	redraw_modeline(tab);
998 
999 	wrefresh(modeline);
1000 	wrefresh(body);
1001 	if (in_minibuffer)
1002 		wrefresh(echoarea);
1003 }
1004 
1005 void
1006 load_url_in_tab(struct tab *tab, const char *url)
1007 {
1008 	message("Loading %s...", url);
1009 	start_loading_anim(tab);
1010 	load_url(tab, url);
1011 
1012 	tab->buffer.curs_x = 0;
1013 	tab->buffer.curs_y = 0;
1014 	redraw_tab(tab);
1015 }
1016 
1017 void
1018 switch_to_tab(struct tab *tab)
1019 {
1020 	struct tab	*t;
1021 
1022 	TAILQ_FOREACH(t, &tabshead, tabs) {
1023 		t->flags &= ~TAB_CURRENT;
1024 	}
1025 
1026 	tab->flags |= TAB_CURRENT;
1027 	tab->flags &= ~TAB_URGENT;
1028 }
1029 
1030 unsigned int
1031 tab_new_id(void)
1032 {
1033 	return tab_counter++;
1034 }
1035 
1036 struct tab *
1037 new_tab(const char *url)
1038 {
1039 	struct tab	*tab;
1040 
1041 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1042 		event_loopbreak();
1043 		return NULL;
1044 	}
1045 	tab->fd = -1;
1046 
1047 	TAILQ_INIT(&tab->hist.head);
1048 
1049 	TAILQ_INIT(&tab->buffer.head);
1050 
1051 	tab->id = tab_new_id();
1052 	switch_to_tab(tab);
1053 
1054 	if (TAILQ_EMPTY(&tabshead))
1055 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1056 	else
1057 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1058 
1059 	load_url_in_tab(tab, url);
1060 	return tab;
1061 }
1062 
1063 int
1064 ui_init()
1065 {
1066 	setlocale(LC_ALL, "");
1067 
1068 	TAILQ_INIT(&eecmd_history.head);
1069 	TAILQ_INIT(&ir_history.head);
1070 	TAILQ_INIT(&lu_history.head);
1071 
1072 	ministate.line.type = LINE_TEXT;
1073 	ministate.vline.parent = &ministate.line;
1074 	ministate.buffer.current_line = &ministate.vline;
1075 
1076 	/* initialize help window */
1077 	TAILQ_INIT(&helpwin.head);
1078 
1079 	base_map = &global_map;
1080 	current_map = &global_map;
1081 
1082 	initscr();
1083 
1084 	if (enable_colors) {
1085 		if (has_colors()) {
1086 			start_color();
1087 			use_default_colors();
1088 		} else
1089 			enable_colors = 0;
1090 	}
1091 
1092 	config_apply_style();
1093 
1094 	raw();
1095 	noecho();
1096 	nonl();
1097 	intrflush(stdscr, FALSE);
1098 
1099 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1100 		return 0;
1101 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1102 		return 0;
1103 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1104 		return 0;
1105 	if ((echoarea = newwin(1, COLS, LINES-1, 0)) == NULL)
1106 		return 0;
1107 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1108 		return 0;
1109 
1110 	body_lines = LINES-3;
1111 	body_cols = COLS;
1112 
1113 	wbkgd(body, body_face.body);
1114 	wbkgd(echoarea, minibuffer_face.background);
1115 
1116 	update_x_offset();
1117 
1118 	keypad(body, TRUE);
1119 	scrollok(body, FALSE);
1120 
1121 	/* non-blocking input */
1122 	wtimeout(body, 0);
1123 
1124 	mvwprintw(body, 0, 0, "");
1125 
1126 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1127 	event_add(&stdioev, NULL);
1128 
1129 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1130 	signal_add(&winchev, NULL);
1131 
1132 	return 1;
1133 }
1134 
1135 void
1136 ui_on_tab_loaded(struct tab *tab)
1137 {
1138 	stop_loading_anim(tab);
1139 	message("Loaded %s", tab->hist_cur->h);
1140 
1141 	redraw_tabline();
1142 	wrefresh(tabline);
1143 	place_cursor(0);
1144 }
1145 
1146 void
1147 ui_on_tab_refresh(struct tab *tab)
1148 {
1149 	wrap_page(&tab->buffer, body_cols);
1150 	if (tab->flags & TAB_CURRENT)
1151 		redraw_tab(tab);
1152 	else
1153 		tab->flags |= TAB_URGENT;
1154 }
1155 
1156 const char *
1157 ui_keyname(int k)
1158 {
1159 	return keyname(k);
1160 }
1161 
1162 void
1163 ui_toggle_side_window(void)
1164 {
1165 	side_window = !side_window;
1166 	if (side_window)
1167 		recompute_help();
1168 
1169 	/*
1170 	 * ugly hack, but otherwise the window doesn't get updated
1171 	 * until I call handle_resize a second time (i.e. C-l).  I
1172 	 * will be happy to know why something like this is needed.
1173 	 */
1174 	handle_resize_nodelay(0, 0, NULL);
1175 	handle_resize_nodelay(0, 0, NULL);
1176 }
1177 
1178 void
1179 ui_schedule_redraw(void)
1180 {
1181 	handle_resize_nodelay(0, 0, NULL);
1182 }
1183 
1184 void
1185 ui_require_input(struct tab *tab, int hide)
1186 {
1187 	/* TODO: hard-switching to another tab is ugly */
1188 	switch_to_tab(tab);
1189 
1190 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1191 	    &ir_history);
1192 	strlcpy(ministate.prompt, "Input required: ",
1193 	    sizeof(ministate.prompt));
1194 	redraw_tab(tab);
1195 }
1196 
1197 void
1198 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1199     struct tab *data)
1200 {
1201 	yornp(prompt, fn, data);
1202 	redraw_tab(current_tab());
1203 }
1204 
1205 void
1206 ui_read(const char *prompt, void (*fn)(const char*, struct tab *),
1207     struct tab *data)
1208 {
1209 	completing_read(prompt, fn, data);
1210 	redraw_tab(current_tab());
1211 }
1212 
1213 void
1214 ui_end(void)
1215 {
1216 	endwin();
1217 }