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Date:: Tue Jul 6 17:44:54 2021 UTC
Message:: fix two related bug Don't crash when there's a certificate mismatch and after saving the cert, before choosing to persist it, the page gets redirected; also, don't repeat the "Certificate mismatch" after the first yes, if there's a redirect. Now when the user accept a certificate, is treated as temporary saved for the whole session.
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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 "telescope.h"
34 
35 #include <assert.h>
36 #include <curses.h>
37 #include <event.h>
38 #include <limits.h>
39 #include <locale.h>
40 #include <signal.h>
41 #include <stdarg.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 
46 static struct event	stdioev, winchev;
47 
48 static void		 restore_curs_x(struct buffer *);
49 static void		 global_key_unbound(void);
50 static void		 minibuffer_hist_save_entry(void);
51 static void		 minibuffer_self_insert(void);
52 static void		 yornp_self_insert(void);
53 static void		 yornp_abort(void);
54 static void		 read_self_insert(void);
55 static void		 read_abort(void);
56 static void		 read_select(void);
57 
58 static struct vline	*nth_line(struct buffer*, size_t);
59 static struct buffer	*current_buffer(void);
60 static int		 readkey(void);
61 static void		 dispatch_stdio(int, short, void*);
62 static void		 handle_clear_minibuf(int, short, void*);
63 static void		 handle_resize(int, short, void*);
64 static void		 handle_resize_nodelay(int, short, void*);
65 static int		 wrap_page(struct buffer*, int);
66 static void		 print_vline(int, int, WINDOW*, struct vline*);
67 static void		 redraw_tabline(void);
68 static void		 redraw_window(WINDOW*, int, int, struct buffer*);
69 static void		 redraw_help(void);
70 static void		 redraw_body(struct tab*);
71 static void		 redraw_modeline(struct tab*);
72 static void		 redraw_minibuffer(void);
73 static void		 redraw_tab(struct tab*);
74 static void		 emit_help_item(char*, void*);
75 static void		 rec_compute_help(struct kmap*, char*, size_t);
76 static void		 recompute_help(void);
77 static void		 update_loading_anim(int, short, void*);
78 static void		 stop_loading_anim(struct tab*);
79 static void		 session_new_tab_cb(const char*);
80 static void		 usage(void);
81 
82 static int		 x_offset;
83 
84 struct thiskey thiskey;
85 
86 static struct event	resizeev;
87 static struct timeval	resize_timer = { 0, 250000 };
88 
89 static WINDOW	*tabline, *body, *modeline, *minibuf;
90 
91 int			 body_lines, body_cols;
92 
93 static WINDOW		*help;
94 static struct buffer	 helpwin;
95 static int		 help_lines, help_cols;
96 
97 static int		 side_window;
98 
99 static struct event	clminibufev;
100 static struct timeval	clminibufev_timer = { 5, 0 };
101 static struct timeval	loadingev_timer = { 0, 250000 };
102 
103 static uint32_t		 tab_counter;
104 
105 static char	keybuf[64];
106 
107 static void (*yornp_cb)(int, struct tab *);
108 static struct tab *yornp_data;
109 
110 static void (*read_cb)(const char*, unsigned int);
111 static unsigned int read_data;
112 
113 struct kmap global_map,
114 	minibuffer_map,
115 	*current_map,
116 	*base_map;
117 
118 struct histhead eecmd_history,
119 	ir_history,
120 	lu_history,
121 	read_history;
122 
123 int in_minibuffer;
124 
125 struct ministate ministate;
126 
127 static inline void
128 update_x_offset(void)
129 {
130 	if (olivetti_mode && fill_column < body_cols)
131 		x_offset = (body_cols - fill_column)/2;
132 	else
133 		x_offset = 0;
134 }
135 
136 void
137 save_excursion(struct excursion *place, struct buffer *buffer)
138 {
139 	place->curs_x = buffer->curs_x;
140 	place->curs_y = buffer->curs_y;
141 	place->line_off = buffer->line_off;
142 	place->current_line = buffer->current_line;
143 	place->cpoff = buffer->cpoff;
144 }
145 
146 void
147 restore_excursion(struct excursion *place, struct buffer *buffer)
148 {
149 	buffer->curs_x = place->curs_x;
150 	buffer->curs_y = place->curs_y;
151 	buffer->line_off = place->line_off;
152 	buffer->current_line = place->current_line;
153 	buffer->cpoff = place->cpoff;
154 }
155 
156 static void
157 restore_curs_x(struct buffer *buffer)
158 {
159 	struct vline	*vl;
160 	const char	*prfx;
161 
162 	vl = buffer->current_line;
163 	if (vl == NULL || vl->line == NULL)
164 		buffer->curs_x = buffer->cpoff = 0;
165 	else
166 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
167 
168 	buffer->curs_x += x_offset;
169 
170 	if (vl != NULL) {
171 		prfx = line_prefixes[vl->parent->type].prfx1;
172 		buffer->curs_x += utf8_swidth(prfx);
173 	}
174 }
175 
176 static void
177 global_key_unbound(void)
178 {
179 	message("%s is undefined", keybuf);
180 }
181 
182 static void
183 minibuffer_hist_save_entry(void)
184 {
185 	struct hist	*hist;
186 
187 	if (ministate.history == NULL)
188 		return;
189 
190 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
191 		abort();
192 
193 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
194 
195 	if (TAILQ_EMPTY(&ministate.history->head))
196 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
197 	else
198 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
199 	ministate.history->len++;
200 }
201 
202 /*
203  * taint the minibuffer cache: if we're currently showing a history
204  * element, copy that to the current buf and reset the "history
205  * navigation" thing.
206  */
207 void
208 minibuffer_taint_hist(void)
209 {
210 	if (ministate.hist_cur == NULL)
211 		return;
212 
213 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
214 	ministate.hist_cur = NULL;
215 }
216 
217 static void
218 minibuffer_self_insert(void)
219 {
220 	char	*c, tmp[5] = {0};
221 	size_t	len;
222 
223 	minibuffer_taint_hist();
224 
225 	if (thiskey.cp == 0)
226 		return;
227 
228 	len = utf8_encode(thiskey.cp, tmp);
229 	c = utf8_nth(ministate.buffer.current_line->line, ministate.buffer.cpoff);
230 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
231 		return;
232 
233 	memmove(c + len, c, strlen(c)+1);
234 	memcpy(c, tmp, len);
235 	ministate.buffer.cpoff++;
236 }
237 
238 void
239 eecmd_self_insert(void)
240 {
241 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
242 	    !unicode_isgraph(thiskey.cp)) {
243 		global_key_unbound();
244 		return;
245 	}
246 
247 	minibuffer_self_insert();
248 }
249 
250 void
251 eecmd_select(void)
252 {
253 	struct cmd *cmd;
254 
255 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
256 		if (!strcmp(cmd->cmd, ministate.buf)) {
257 			exit_minibuffer();
258 			minibuffer_hist_save_entry();
259 			cmd->fn(current_buffer());
260 			return;
261 		}
262 	}
263 
264 	message("No match");
265 }
266 
267 void
268 ir_self_insert(void)
269 {
270 	minibuffer_self_insert();
271 }
272 
273 void
274 ir_select(void)
275 {
276 	char		 buf[1025] = {0};
277 	struct phos_uri	 uri;
278 	struct tab	*tab;
279 
280 	tab = current_tab();
281 
282 	exit_minibuffer();
283 	minibuffer_hist_save_entry();
284 
285 	/* a bit ugly but... */
286 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
287 	phos_uri_set_query(&uri, ministate.buf);
288 	phos_serialize_uri(&uri, buf, sizeof(buf));
289 	load_url_in_tab(tab, buf);
290 }
291 
292 void
293 lu_self_insert(void)
294 {
295 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
296 	    !unicode_isgraph(thiskey.key)) {
297 		global_key_unbound();
298 		return;
299 	}
300 
301 	minibuffer_self_insert();
302 }
303 
304 void
305 lu_select(void)
306 {
307 	exit_minibuffer();
308 	minibuffer_hist_save_entry();
309 	load_url_in_tab(current_tab(), ministate.buf);
310 }
311 
312 void
313 bp_select(void)
314 {
315 	exit_minibuffer();
316 	if (*ministate.buf != '\0')
317 		add_to_bookmarks(ministate.buf);
318 	else
319 		message("Abort.");
320 }
321 
322 static void
323 yornp_self_insert(void)
324 {
325 	if (thiskey.key != 'y' && thiskey.key != 'n') {
326 		message("Please answer y or n");
327 		return;
328 	}
329 
330 	exit_minibuffer();
331 	yornp_cb(thiskey.key == 'y', yornp_data);
332 }
333 
334 static void
335 yornp_abort(void)
336 {
337 	exit_minibuffer();
338 	yornp_cb(0, yornp_data);
339 }
340 
341 static void
342 read_self_insert(void)
343 {
344 	if (thiskey.meta || !unicode_isgraph(thiskey.cp)) {
345 		global_key_unbound();
346 		return;
347 	}
348 
349 	minibuffer_self_insert();
350 }
351 
352 static void
353 read_abort(void)
354 {
355 	exit_minibuffer();
356 	read_cb(NULL, read_data);
357 }
358 
359 static void
360 read_select(void)
361 {
362         exit_minibuffer();
363 	minibuffer_hist_save_entry();
364 	read_cb(ministate.buf, read_data);
365 }
366 
367 static struct vline *
368 nth_line(struct buffer *buffer, size_t n)
369 {
370 	struct vline	*vl;
371 	size_t		 i;
372 
373 	i = 0;
374 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
375 		if (i == n)
376 			return vl;
377 		i++;
378 	}
379 
380 	/* unreachable */
381 	abort();
382 }
383 
384 struct tab *
385 current_tab(void)
386 {
387 	struct tab *t;
388 
389 	TAILQ_FOREACH(t, &tabshead, tabs) {
390 		if (t->flags & TAB_CURRENT)
391 			return t;
392 	}
393 
394 	/* unreachable */
395 	abort();
396 }
397 
398 struct buffer *
399 current_buffer(void)
400 {
401 	if (in_minibuffer)
402 		return &ministate.buffer;
403 	return &current_tab()->buffer;
404 }
405 
406 static int
407 readkey(void)
408 {
409 	uint32_t state = 0;
410 
411 	if ((thiskey.key = wgetch(body)) == ERR)
412 		return 0;
413 
414 	thiskey.meta = thiskey.key == 27;
415 	if (thiskey.meta) {
416 		thiskey.key = wgetch(body);
417 		if (thiskey.key == ERR || thiskey.key == 27) {
418 			thiskey.meta = 0;
419 			thiskey.key = 27;
420 		}
421 	}
422 
423 	thiskey.cp = 0;
424 	if ((unsigned int)thiskey.key < UINT8_MAX) {
425 		while (1) {
426 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
427 				break;
428 			if ((thiskey.key = wgetch(body)) == ERR) {
429 				message("Error decoding user input");
430 				return 0;
431 			}
432 		}
433 	}
434 
435 	return 1;
436 }
437 
438 static void
439 dispatch_stdio(int fd, short ev, void *d)
440 {
441 	struct keymap	*k;
442 	const char	*keyname;
443 	char		 tmp[5] = {0};
444 
445 	if (!readkey())
446 		return;
447 
448 	if (keybuf[0] != '\0')
449 		strlcat(keybuf, " ", sizeof(keybuf));
450 	if (thiskey.meta)
451 		strlcat(keybuf, "M-", sizeof(keybuf));
452 	if (thiskey.cp != 0) {
453 		utf8_encode(thiskey.cp, tmp);
454 		strlcat(keybuf, tmp, sizeof(keybuf));
455 	} else {
456 		if ((keyname = unkbd(thiskey.key)) != NULL)
457 			strlcat(keybuf, keyname, sizeof(keybuf));
458 		else {
459 			tmp[0] = thiskey.key;
460 			strlcat(keybuf, tmp, sizeof(keybuf));
461 		}
462 	}
463 
464 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
465 		if (k->meta == thiskey.meta &&
466 		    k->key == thiskey.key) {
467 			if (k->fn == NULL)
468 				current_map = &k->map;
469 			else {
470 				current_map = base_map;
471 				strlcpy(keybuf, "", sizeof(keybuf));
472 				k->fn(current_buffer());
473 			}
474 			goto done;
475 		}
476 	}
477 
478 	if (current_map->unhandled_input != NULL)
479 		current_map->unhandled_input();
480 	else
481 		global_key_unbound();
482 
483 	strlcpy(keybuf, "", sizeof(keybuf));
484 	current_map = base_map;
485 
486 done:
487 	if (side_window)
488 		recompute_help();
489 
490 	redraw_tab(current_tab());
491 }
492 
493 static void
494 handle_clear_minibuf(int fd, short ev, void *d)
495 {
496 	free(ministate.curmesg);
497 	ministate.curmesg = NULL;
498 
499 	redraw_minibuffer();
500 	if (in_minibuffer) {
501 		wrefresh(body);
502 		wrefresh(minibuf);
503 	} else {
504 		wrefresh(minibuf);
505 		wrefresh(body);
506 	}
507 }
508 
509 static void
510 handle_resize(int sig, short ev, void *d)
511 {
512 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
513 		event_del(&resizeev);
514 	}
515 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
516 	evtimer_add(&resizeev, &resize_timer);
517 }
518 
519 static void
520 handle_resize_nodelay(int s, short ev, void *d)
521 {
522 	struct tab	*tab;
523 
524 	endwin();
525 	refresh();
526 	clear();
527 
528 	/* move and resize the windows, in reverse order! */
529 
530 	mvwin(minibuf, LINES-1, 0);
531 	wresize(minibuf, 1, COLS);
532 
533 	mvwin(modeline, LINES-2, 0);
534 	wresize(modeline, 1, COLS);
535 
536 	body_lines = LINES-3;
537 	body_cols = COLS;
538 
539 	if (side_window) {
540 		help_cols = 0.3 * COLS;
541 		help_lines = LINES-3;
542 		mvwin(help, 1, 0);
543 		wresize(help, help_lines, help_cols);
544 
545 		wrap_page(&helpwin, help_cols);
546 
547 		body_cols = COLS - help_cols - 1;
548 		mvwin(body, 1, help_cols);
549 	} else
550 		mvwin(body, 1, 0);
551 
552 	update_x_offset();
553 	wresize(body, body_lines, body_cols);
554 
555 	wresize(tabline, 1, COLS);
556 
557 	tab = current_tab();
558 
559 	wrap_page(&tab->buffer, body_cols);
560 	redraw_tab(tab);
561 }
562 
563 static int
564 wrap_page(struct buffer *buffer, int width)
565 {
566 	struct line		*l;
567 	const struct line	*top_orig, *orig;
568 	struct vline		*vl;
569 	int			 pre_width;
570 	const char		*prfx;
571 
572 	top_orig = buffer->top_line == NULL ? NULL : buffer->top_line->parent;
573 	orig = buffer->current_line == NULL ? NULL : buffer->current_line->parent;
574 
575 	buffer->top_line = NULL;
576 	buffer->current_line = NULL;
577 
578 	buffer->force_redraw = 1;
579 	buffer->curs_y = 0;
580 	buffer->line_off = 0;
581 
582 	empty_vlist(buffer);
583 
584 	TAILQ_FOREACH(l, &buffer->page.head, lines) {
585 		prfx = line_prefixes[l->type].prfx1;
586 		switch (l->type) {
587 		case LINE_TEXT:
588 		case LINE_LINK:
589 		case LINE_TITLE_1:
590 		case LINE_TITLE_2:
591 		case LINE_TITLE_3:
592 		case LINE_ITEM:
593 		case LINE_QUOTE:
594 		case LINE_PRE_START:
595 		case LINE_PRE_END:
596 			wrap_text(buffer, prfx, l, MIN(fill_column, width));
597 			break;
598 		case LINE_PRE_CONTENT:
599 			if (olivetti_mode)
600 				pre_width = MIN(fill_column, width);
601 			else
602 				pre_width = width;
603 			hardwrap_text(buffer, l, pre_width);
604 			break;
605 		}
606 
607 		if (top_orig == l && buffer->top_line == NULL) {
608 			buffer->line_off = buffer->line_max-1;
609 			buffer->top_line = TAILQ_LAST(&buffer->head, vhead);
610 
611 			while (1) {
612 				vl = TAILQ_PREV(buffer->top_line, vhead, vlines);
613 				if (vl == NULL || vl->parent != orig)
614 					break;
615 				buffer->top_line = vl;
616 				buffer->line_off--;
617 			}
618 		}
619 
620 		if (orig == l && buffer->current_line == NULL) {
621 			buffer->current_line = TAILQ_LAST(&buffer->head, vhead);
622 
623 			while (1) {
624 				vl = TAILQ_PREV(buffer->current_line, vhead, vlines);
625 				if (vl == NULL || vl->parent != orig)
626 					break;
627 				buffer->current_line = vl;
628 			}
629 		}
630 	}
631 
632         if (buffer->current_line == NULL)
633 		buffer->current_line = TAILQ_FIRST(&buffer->head);
634 
635 	if (buffer->top_line == NULL)
636 		buffer->top_line = buffer->current_line;
637 
638 	return 1;
639 }
640 
641 static void
642 print_vline(int off, int width, WINDOW *window, struct vline *vl)
643 {
644 	const char *text;
645 	const char *prfx;
646 	struct line_face *f;
647 	int i, left, x, y;
648 
649 	f = &line_faces[vl->parent->type];
650 
651 	/* unused, set by getyx */
652 	(void)y;
653 
654 	if (!vl->flags)
655 		prfx = line_prefixes[vl->parent->type].prfx1;
656 	else
657 		prfx = line_prefixes[vl->parent->type].prfx2;
658 
659 	text = vl->line;
660 	if (text == NULL)
661 		text = "";
662 
663 	wattr_on(window, body_face.left, NULL);
664 	for (i = 0; i < off; i++)
665 		waddch(window, ' ');
666 	wattr_off(window, body_face.left, NULL);
667 
668 	wattr_on(window, f->prefix, NULL);
669 	wprintw(window, "%s", prfx);
670 	wattr_off(window, f->prefix, NULL);
671 
672 	wattr_on(window, f->text, NULL);
673 	wprintw(window, "%s", text);
674 	wattr_off(window, f->text, NULL);
675 
676 	getyx(window, y, x);
677 
678 	left = width - x;
679 
680 	wattr_on(window, f->trail, NULL);
681 	for (i = 0; i < left - off - 1; ++i)
682 		waddch(window, ' ');
683 	wattr_off(window, f->trail, NULL);
684 
685 	wattr_on(window, body_face.right, NULL);
686 	for (i = 0; i < off; i++)
687 		waddch(window, ' ');
688 	wattr_off(window, body_face.right, NULL);
689 
690 }
691 
692 static void
693 redraw_tabline(void)
694 {
695 	struct tab	*tab;
696 	size_t		 toskip, ots, tabwidth, space, x;
697 	int		 current, y, truncated;
698 	const char	*title;
699 	char		 buf[25];
700 
701 	x = 0;
702 
703 	/* unused, but setted by a getyx */
704 	(void)y;
705 
706 	tabwidth = sizeof(buf)+1;
707 	space = COLS-2;
708 
709 	toskip = 0;
710 	TAILQ_FOREACH(tab, &tabshead, tabs) {
711 		toskip++;
712 		if (tab->flags & TAB_CURRENT)
713 			break;
714 	}
715 
716 	if (toskip * tabwidth < space)
717 		toskip = 0;
718 	else {
719 		ots = toskip;
720 		toskip--;
721                 while (toskip != 0 &&
722 		    (ots - toskip+1) * tabwidth < space)
723 			toskip--;
724 	}
725 
726 	werase(tabline);
727 	wattr_on(tabline, tab_face.background, NULL);
728 	wprintw(tabline, toskip == 0 ? " " : "<");
729 	wattr_off(tabline, tab_face.background, NULL);
730 
731 	truncated = 0;
732 	TAILQ_FOREACH(tab, &tabshead, tabs) {
733 		if (truncated)
734 			break;
735 		if (toskip != 0) {
736 			toskip--;
737 			continue;
738 		}
739 
740 		getyx(tabline, y, x);
741 		if (x + sizeof(buf)+2 >= (size_t)COLS)
742 			truncated = 1;
743 
744 		current = tab->flags & TAB_CURRENT;
745 
746 		if (*(title = tab->buffer.page.title) == '\0')
747 			title = tab->hist_cur->h;
748 
749 		if (tab->flags & TAB_URGENT)
750 			strlcpy(buf, "!", sizeof(buf));
751 		else
752 			strlcpy(buf, " ", sizeof(buf));
753 
754                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
755 			/* truncation happens */
756 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
757 		} else {
758 			/* pad with spaces */
759 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
760 				/* nop */ ;
761 		}
762 
763 		if (current)
764 			wattr_on(tabline, tab_face.current, NULL);
765 		else
766 			wattr_on(tabline, tab_face.tab, NULL);
767 
768 		wprintw(tabline, "%s", buf);
769 		if (TAILQ_NEXT(tab, tabs) != NULL)
770 			wprintw(tabline, " ");
771 
772 		if (current)
773 			wattr_off(tabline, tab_face.current, NULL);
774 		else
775 			wattr_off(tabline, tab_face.tab, NULL);
776 	}
777 
778 	wattr_on(tabline, tab_face.background, NULL);
779 	for (; x < (size_t)COLS; ++x)
780 		waddch(tabline, ' ');
781 	if (truncated)
782 		mvwprintw(tabline, 0, COLS-1, ">");
783 	wattr_off(tabline, tab_face.background, NULL);
784 }
785 
786 /*
787  * Compute the first visible line around vl.  Try to search forward
788  * until the end of the buffer; if a visible line is not found, search
789  * backward.  Return NULL if no viable line was found.
790  */
791 static inline struct vline *
792 adjust_line(struct vline *vl, struct buffer *buffer)
793 {
794 	struct vline *t;
795 
796 	if (!(vl->parent->flags & L_HIDDEN))
797 		return vl;
798 
799 	/* search forward */
800 	for (t = vl;
801 	     t != NULL && t->parent->flags & L_HIDDEN;
802 	     t = TAILQ_NEXT(t, vlines))
803 		;		/* nop */
804 
805 	if (t != NULL)
806 		return t;
807 
808 	/* search backward */
809 	for (t = vl;
810 	     t != NULL && t->parent->flags & L_HIDDEN;
811 	     t = TAILQ_PREV(t, vhead, vlines))
812 		;		/* nop */
813 
814 	return t;
815 }
816 
817 static void
818 redraw_window(WINDOW *win, int height, int width, struct buffer *buffer)
819 {
820         struct vline	*vl;
821 	int		 l, onscreen;
822 
823 	restore_curs_x(buffer);
824 
825 	/*
826 	 * TODO: ignoring buffer->force_update and always
827 	 * re-rendering.  In theory we can recompute the y position
828 	 * without a re-render, and optimize here.  It's not the only
829 	 * optimisation possible here, wscrl wolud also be an
830 	 * interesting one.
831 	 */
832 
833 again:
834 	werase(win);
835 	buffer->curs_y = 0;
836 
837 	if (TAILQ_EMPTY(&buffer->head))
838 		goto end;
839 
840 	buffer->top_line = adjust_line(buffer->top_line, buffer);
841 	if (buffer->top_line == NULL)
842 		goto end;
843 
844 	buffer->current_line = adjust_line(buffer->current_line, buffer);
845 
846 	l = 0;
847 	onscreen = 0;
848 	for (vl = buffer->top_line; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
849 		if (vl->parent->flags & L_HIDDEN)
850 			continue;
851 
852 		wmove(win, l, 0);
853 		print_vline(x_offset, width, win, vl);
854 
855 		if (vl == buffer->current_line)
856 			onscreen = 1;
857 
858 		if (!onscreen)
859 			buffer->curs_y++;
860 
861 		l++;
862 		if (l == height)
863 			break;
864 	}
865 
866 	if (!onscreen) {
867 		for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
868 			if (vl == buffer->current_line)
869 				break;
870 			if (vl->parent->flags & L_HIDDEN)
871 				continue;
872 			buffer->line_off++;
873 			buffer->top_line = TAILQ_NEXT(buffer->top_line, vlines);
874 		}
875 
876 		goto again;
877 	}
878 
879 	buffer->last_line_off = buffer->line_off;
880 	buffer->force_redraw = 0;
881 end:
882 	wmove(win, buffer->curs_y, buffer->curs_x);
883 }
884 
885 static void
886 redraw_help(void)
887 {
888 	redraw_window(help, help_lines, help_cols, &helpwin);
889 }
890 
891 static void
892 redraw_body(struct tab *tab)
893 {
894 	static struct tab *last_tab;
895 
896 	if (last_tab != tab)
897 		tab->buffer.force_redraw =1;
898 	last_tab = tab;
899 
900 	redraw_window(body, body_lines, body_cols, &tab->buffer);
901 }
902 
903 static inline char
904 trust_status_char(enum trust_state ts)
905 {
906 	switch (ts) {
907 	case TS_UNKNOWN:	return 'u';
908 	case TS_UNTRUSTED:	return '!';
909 	case TS_TEMP_TRUSTED:	return '!';
910 	case TS_TRUSTED:	return 'v';
911 	case TS_VERIFIED:	return 'V';
912 	default:		return 'X';
913 	}
914 }
915 
916 static void
917 redraw_modeline(struct tab *tab)
918 {
919 	double		 pct;
920 	int		 x, y, max_x, max_y;
921 	const char	*mode = tab->buffer.page.name;
922 	const char	*spin = "-\\|/";
923 
924 	werase(modeline);
925 	wattr_on(modeline, modeline_face.background, NULL);
926 	wmove(modeline, 0, 0);
927 
928 	wprintw(modeline, "-%c%c %s ",
929 	    spin[tab->loading_anim_step],
930 	    trust_status_char(tab->trust),
931 	    mode == NULL ? "(none)" : mode);
932 
933 	pct = (tab->buffer.line_off + tab->buffer.curs_y) * 100.0 / tab->buffer.line_max;
934 
935 	if (tab->buffer.line_max <= (size_t)body_lines)
936                 wprintw(modeline, "All ");
937 	else if (tab->buffer.line_off == 0)
938                 wprintw(modeline, "Top ");
939 	else if (tab->buffer.line_off + body_lines >= tab->buffer.line_max)
940 		wprintw(modeline, "Bottom ");
941 	else
942 		wprintw(modeline, "%.0f%% ", pct);
943 
944 	wprintw(modeline, "%d/%d %s ",
945 	    tab->buffer.line_off + tab->buffer.curs_y,
946 	    tab->buffer.line_max,
947 	    tab->hist_cur->h);
948 
949 	getyx(modeline, y, x);
950 	getmaxyx(modeline, max_y, max_x);
951 
952 	(void)y;
953 	(void)max_y;
954 
955 	for (; x < max_x; ++x)
956 		waddstr(modeline, "-");
957 
958 	wattr_off(modeline, modeline_face.background, NULL);
959 }
960 
961 static void
962 redraw_minibuffer(void)
963 {
964 	struct tab *tab;
965 	size_t off_y, off_x = 0;
966 	char *start = NULL, *c = NULL;
967 
968 	/* unused, but set by getyx */
969 	(void)off_y;
970 
971 	wattr_on(minibuf, minibuffer_face.background, NULL);
972 	werase(minibuf);
973 
974 	if (in_minibuffer) {
975 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
976 		if (ministate.hist_cur != NULL)
977 			wprintw(minibuf, "(%zu/%zu) ",
978 			    ministate.hist_off + 1,
979 			    ministate.history->len);
980 
981 		getyx(minibuf, off_y, off_x);
982 
983 		start = ministate.hist_cur != NULL
984 			? ministate.hist_cur->h
985 			: ministate.buf;
986 		c = utf8_nth(ministate.buffer.current_line->line,
987 		    ministate.buffer.cpoff);
988 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
989 			start = utf8_next_cp(start);
990 		}
991 
992 		waddstr(minibuf, start);
993 	}
994 
995 	if (ministate.curmesg != NULL)
996                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
997 		    ministate.curmesg);
998 
999 	if (!in_minibuffer && ministate.curmesg == NULL)
1000 		waddstr(minibuf, keybuf);
1001 
1002 	/* If nothing else, show the URL at point */
1003 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1004 		tab = current_tab();
1005 		if (tab->buffer.current_line != NULL &&
1006 		    tab->buffer.current_line->parent->type == LINE_LINK)
1007 			waddstr(minibuf, tab->buffer.current_line->parent->alt);
1008 	}
1009 
1010 	if (in_minibuffer)
1011 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1012 
1013 	wattr_off(minibuf, minibuffer_face.background, NULL);
1014 }
1015 
1016 static void
1017 redraw_tab(struct tab *tab)
1018 {
1019 	if (side_window) {
1020 		redraw_help();
1021 		wnoutrefresh(help);
1022 	}
1023 
1024 	redraw_tabline();
1025 	redraw_body(tab);
1026 	redraw_modeline(tab);
1027 	redraw_minibuffer();
1028 
1029 	wnoutrefresh(tabline);
1030 	wnoutrefresh(modeline);
1031 
1032 	if (in_minibuffer) {
1033 		wnoutrefresh(body);
1034 		wnoutrefresh(minibuf);
1035 	} else {
1036 		wnoutrefresh(minibuf);
1037 		wnoutrefresh(body);
1038 	}
1039 
1040 	doupdate();
1041 }
1042 
1043 static void
1044 emit_help_item(char *prfx, void *fn)
1045 {
1046 	struct line	*l;
1047 	struct cmd	*cmd;
1048 
1049 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1050 		if (fn == cmd->fn)
1051 			break;
1052 	}
1053 	assert(cmd != NULL);
1054 
1055 	if ((l = calloc(1, sizeof(*l))) == NULL)
1056 		abort();
1057 
1058 	l->type = LINE_TEXT;
1059 	l->alt = NULL;
1060 
1061 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1062 
1063 	if (TAILQ_EMPTY(&helpwin.page.head))
1064 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1065 	else
1066 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1067 }
1068 
1069 static void
1070 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1071 {
1072 	struct keymap	*k;
1073 	char		 p[32];
1074 	const char	*kn;
1075 
1076 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1077 		strlcpy(p, prfx, sizeof(p));
1078 		if (*p != '\0')
1079 			strlcat(p, " ", sizeof(p));
1080 		if (k->meta)
1081 			strlcat(p, "M-", sizeof(p));
1082 		if ((kn = unkbd(k->key)) != NULL)
1083 			strlcat(p, kn, sizeof(p));
1084 		else
1085 			strlcat(p, keyname(k->key), sizeof(p));
1086 
1087 		if (k->fn == NULL)
1088 			rec_compute_help(&k->map, p, sizeof(p));
1089 		else
1090 			emit_help_item(p, k->fn);
1091 	}
1092 }
1093 
1094 static void
1095 recompute_help(void)
1096 {
1097 	char	p[32] = { 0 };
1098 
1099 	empty_vlist(&helpwin);
1100 	empty_linelist(&helpwin);
1101 	rec_compute_help(current_map, p, sizeof(p));
1102 	wrap_page(&helpwin, help_cols);
1103 }
1104 
1105 void
1106 vmessage(const char *fmt, va_list ap)
1107 {
1108 	if (evtimer_pending(&clminibufev, NULL))
1109 		evtimer_del(&clminibufev);
1110 
1111 	free(ministate.curmesg);
1112 	ministate.curmesg = NULL;
1113 
1114 	if (fmt != NULL) {
1115 		evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1116 		evtimer_add(&clminibufev, &clminibufev_timer);
1117 
1118 		/* TODO: what to do if the allocation fails here? */
1119 		if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1120 			ministate.curmesg = NULL;
1121 	}
1122 
1123 	redraw_minibuffer();
1124 	if (in_minibuffer) {
1125 		wrefresh(body);
1126 		wrefresh(minibuf);
1127 	} else {
1128 		wrefresh(minibuf);
1129 		wrefresh(body);
1130 	}
1131 }
1132 
1133 void
1134 message(const char *fmt, ...)
1135 {
1136 	va_list ap;
1137 
1138 	va_start(ap, fmt);
1139 	vmessage(fmt, ap);
1140 	va_end(ap);
1141 }
1142 
1143 void
1144 start_loading_anim(struct tab *tab)
1145 {
1146 	if (tab->loading_anim)
1147 		return;
1148 	tab->loading_anim = 1;
1149 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1150 	evtimer_add(&tab->loadingev, &loadingev_timer);
1151 }
1152 
1153 static void
1154 update_loading_anim(int fd, short ev, void *d)
1155 {
1156 	struct tab	*tab = d;
1157 
1158 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1159 
1160 	if (tab->flags & TAB_CURRENT) {
1161 		redraw_modeline(tab);
1162 		wrefresh(modeline);
1163 		wrefresh(body);
1164 		if (in_minibuffer)
1165 			wrefresh(minibuf);
1166 	}
1167 
1168 	evtimer_add(&tab->loadingev, &loadingev_timer);
1169 }
1170 
1171 static void
1172 stop_loading_anim(struct tab *tab)
1173 {
1174 	if (!tab->loading_anim)
1175 		return;
1176 	evtimer_del(&tab->loadingev);
1177 	tab->loading_anim = 0;
1178 	tab->loading_anim_step = 0;
1179 
1180 	if (!(tab->flags & TAB_CURRENT))
1181 		return;
1182 
1183 	redraw_modeline(tab);
1184 
1185 	wrefresh(modeline);
1186 	wrefresh(body);
1187 	if (in_minibuffer)
1188 		wrefresh(minibuf);
1189 }
1190 
1191 void
1192 load_url_in_tab(struct tab *tab, const char *url)
1193 {
1194 	message("Loading %s...", url);
1195 	start_loading_anim(tab);
1196 	load_url(tab, url);
1197 
1198 	tab->buffer.curs_x = 0;
1199 	tab->buffer.curs_y = 0;
1200 	redraw_tab(tab);
1201 }
1202 
1203 void
1204 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1205     void (*abortfn)(void), struct histhead *hist)
1206 {
1207 	in_minibuffer = 1;
1208 	base_map = &minibuffer_map;
1209 	current_map = &minibuffer_map;
1210 
1211 	base_map->unhandled_input = self_insert_fn;
1212 
1213 	ministate.donefn = donefn;
1214 	ministate.abortfn = abortfn;
1215 	memset(ministate.buf, 0, sizeof(ministate.buf));
1216 	ministate.buffer.current_line = &ministate.vline;
1217 	ministate.buffer.current_line->line = ministate.buf;
1218 	ministate.buffer.cpoff = 0;
1219 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1220 
1221 	ministate.history = hist;
1222 	ministate.hist_cur = NULL;
1223 	ministate.hist_off = 0;
1224 }
1225 
1226 void
1227 exit_minibuffer(void)
1228 {
1229 	werase(minibuf);
1230 
1231 	in_minibuffer = 0;
1232 	base_map = &global_map;
1233 	current_map = &global_map;
1234 }
1235 
1236 void
1237 switch_to_tab(struct tab *tab)
1238 {
1239 	struct tab	*t;
1240 
1241 	TAILQ_FOREACH(t, &tabshead, tabs) {
1242 		t->flags &= ~TAB_CURRENT;
1243 	}
1244 
1245 	tab->flags |= TAB_CURRENT;
1246 	tab->flags &= ~TAB_URGENT;
1247 }
1248 
1249 unsigned int
1250 tab_new_id(void)
1251 {
1252 	return tab_counter++;
1253 }
1254 
1255 struct tab *
1256 new_tab(const char *url)
1257 {
1258 	struct tab	*tab;
1259 
1260 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1261 		event_loopbreak();
1262 		return NULL;
1263 	}
1264 	tab->fd = -1;
1265 
1266 	TAILQ_INIT(&tab->hist.head);
1267 
1268 	TAILQ_INIT(&tab->buffer.head);
1269 
1270 	tab->id = tab_new_id();
1271 	switch_to_tab(tab);
1272 
1273 	if (TAILQ_EMPTY(&tabshead))
1274 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1275 	else
1276 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1277 
1278 	load_url_in_tab(tab, url);
1279 	return tab;
1280 }
1281 
1282 static void
1283 session_new_tab_cb(const char *url)
1284 {
1285 	new_tab(url);
1286 }
1287 
1288 static void
1289 usage(void)
1290 {
1291 	fprintf(stderr, "USAGE: %s [-hn] [-c config] [url]\n", getprogname());
1292 	fprintf(stderr, "version: " PACKAGE " " VERSION "\n");
1293 }
1294 
1295 int
1296 ui_init(int argc, char * const *argv)
1297 {
1298 	char path[PATH_MAX];
1299 	const char *url = NEW_TAB_URL;
1300 	int ch, configtest = 0, fonf = 0;
1301 
1302 	if (getenv("NO_COLOR") != NULL)
1303 		enable_colors = 0;
1304 
1305 	strlcpy(path, getenv("HOME"), sizeof(path));
1306 	strlcat(path, "/.telescope/config", sizeof(path));
1307 
1308 	while ((ch = getopt(argc, argv, "c:hn")) != -1) {
1309 		switch (ch) {
1310 		case 'c':
1311 			fonf = 1;
1312 			strlcpy(path, optarg, sizeof(path));
1313 			break;
1314 		case 'n':
1315 			configtest = 1;
1316 			break;
1317 		case 'h':
1318 			usage();
1319 			return 0;
1320 		default:
1321 			usage();
1322 			return 1;
1323 		}
1324 	}
1325 	argc -= optind;
1326 	argv += optind;
1327 
1328 	/* setup keys before reading the config */
1329 	TAILQ_INIT(&global_map.m);
1330 	global_map.unhandled_input = global_key_unbound;
1331 
1332 	TAILQ_INIT(&minibuffer_map.m);
1333 
1334 	config_init();
1335 	parseconfig(path, fonf);
1336 	if (configtest){
1337 		puts("config OK");
1338 		exit(0);
1339 	}
1340 
1341 	if (argc != 0)
1342 		url = argv[0];
1343 
1344 	setlocale(LC_ALL, "");
1345 
1346 	TAILQ_INIT(&eecmd_history.head);
1347 	TAILQ_INIT(&ir_history.head);
1348 	TAILQ_INIT(&lu_history.head);
1349 
1350 	ministate.line.type = LINE_TEXT;
1351 	ministate.vline.parent = &ministate.line;
1352 	ministate.buffer.current_line = &ministate.vline;
1353 
1354 	/* initialize help window */
1355 	TAILQ_INIT(&helpwin.head);
1356 
1357 	base_map = &global_map;
1358 	current_map = &global_map;
1359 
1360 	initscr();
1361 
1362 	if (enable_colors) {
1363 		if (has_colors()) {
1364 			start_color();
1365 			use_default_colors();
1366 		} else
1367 			enable_colors = 0;
1368 	}
1369 
1370 	config_apply_style();
1371 
1372 	raw();
1373 	noecho();
1374 	nonl();
1375 	intrflush(stdscr, FALSE);
1376 
1377 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1378 		return 0;
1379 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1380 		return 0;
1381 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1382 		return 0;
1383 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1384 		return 0;
1385 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1386 		return 0;
1387 
1388 	body_lines = LINES-3;
1389 	body_cols = COLS;
1390 
1391 	wbkgd(body, body_face.body);
1392 	wbkgd(minibuf, minibuffer_face.background);
1393 
1394 	update_x_offset();
1395 
1396 	keypad(body, TRUE);
1397 	scrollok(body, FALSE);
1398 
1399 	/* non-blocking input */
1400 	wtimeout(body, 0);
1401 
1402 	mvwprintw(body, 0, 0, "");
1403 
1404 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1405 	event_add(&stdioev, NULL);
1406 
1407 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1408 	signal_add(&winchev, NULL);
1409 
1410 	load_last_session(session_new_tab_cb);
1411 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
1412 		new_tab(url);
1413 
1414 	return 1;
1415 }
1416 
1417 void
1418 ui_on_tab_loaded(struct tab *tab)
1419 {
1420 	stop_loading_anim(tab);
1421 	message("Loaded %s", tab->hist_cur->h);
1422 
1423 	redraw_tabline();
1424 	wrefresh(tabline);
1425 	if (in_minibuffer)
1426 		wrefresh(minibuf);
1427 	else
1428 		wrefresh(body);
1429 }
1430 
1431 void
1432 ui_on_tab_refresh(struct tab *tab)
1433 {
1434 	wrap_page(&tab->buffer, body_cols);
1435 	if (tab->flags & TAB_CURRENT)
1436 		redraw_tab(tab);
1437 	else
1438 		tab->flags |= TAB_URGENT;
1439 }
1440 
1441 const char *
1442 ui_keyname(int k)
1443 {
1444 	return keyname(k);
1445 }
1446 
1447 void
1448 ui_toggle_side_window(void)
1449 {
1450 	side_window = !side_window;
1451 	if (side_window)
1452 		recompute_help();
1453 
1454 	/*
1455 	 * ugly hack, but otherwise the window doesn't get updated
1456 	 * until I call handle_resize a second time (i.e. C-l).  I
1457 	 * will be happy to know why something like this is needed.
1458 	 */
1459 	handle_resize_nodelay(0, 0, NULL);
1460 	handle_resize_nodelay(0, 0, NULL);
1461 }
1462 
1463 void
1464 ui_schedule_redraw(void)
1465 {
1466 	handle_resize_nodelay(0, 0, NULL);
1467 }
1468 
1469 void
1470 ui_require_input(struct tab *tab, int hide)
1471 {
1472 	/* TODO: hard-switching to another tab is ugly */
1473 	switch_to_tab(tab);
1474 
1475 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1476 	    &ir_history);
1477 	strlcpy(ministate.prompt, "Input required: ",
1478 	    sizeof(ministate.prompt));
1479 	redraw_tab(tab);
1480 }
1481 
1482 void
1483 ui_yornp(const char *prompt, void (*fn)(int, struct tab *),
1484     struct tab *data)
1485 {
1486 	size_t len;
1487 
1488 	if (in_minibuffer) {
1489 		fn(0, data);
1490 		return;
1491 	}
1492 
1493 	yornp_cb = fn;
1494 	yornp_data = data;
1495 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
1496 	    yornp_abort, NULL);
1497 
1498 	len = sizeof(ministate.prompt);
1499 	strlcpy(ministate.prompt, prompt, len);
1500 	strlcat(ministate.prompt, " (y or n) ", len);
1501 	redraw_tab(current_tab());
1502 }
1503 
1504 void
1505 ui_read(const char *prompt, void (*fn)(const char*, unsigned int),
1506     unsigned int data)
1507 {
1508 	size_t len;
1509 
1510 	if (in_minibuffer)
1511 		return;
1512 
1513 	read_cb = fn;
1514 	read_data = data;
1515 	enter_minibuffer(read_self_insert, read_select, read_abort,
1516 	    &read_history);
1517 
1518 	len = sizeof(ministate.prompt);
1519 	strlcpy(ministate.prompt, prompt, len);
1520 	strlcat(ministate.prompt, ": ", len);
1521 	redraw_tab(current_tab());
1522 }
1523 
1524 void
1525 ui_end(void)
1526 {
1527 	endwin();
1528 }