status.c revision 1.43 
1/* $OpenBSD: status.c,v 1.43 2009/11/17 13:30:07 nicm Exp $ */
2
3/*
4 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include <sys/time.h>
21
22#include <errno.h>
23#include <limits.h>
24#include <stdarg.h>
25#include <stdlib.h>
26#include <string.h>
27#include <time.h>
28#include <unistd.h>
29
30#include "tmux.h"
31
32char   *status_job(struct client *, char **);
33void	status_job_callback(struct job *);
34size_t	status_width(struct winlink *);
35char   *status_print(struct session *, struct winlink *, struct grid_cell *);
36void	status_message_callback(int, short, void *);
37
38void	status_prompt_add_history(struct client *);
39char   *status_prompt_complete(const char *);
40
41/* Draw status for client on the last lines of given context. */
42int
43status_redraw(struct client *c)
44{
45	struct screen_write_ctx		ctx;
46	struct session		       *s = c->session;
47	struct winlink		       *wl;
48	struct screen		      	old_status;
49	char		 	       *left, *right, *text, *ptr;
50	size_t				llen, llen2, rlen, rlen2, offset;
51	size_t				ox, xx, yy, size, start, width;
52	struct grid_cell	        stdgc, sl_stdgc, sr_stdgc, gc;
53	int				larrow, rarrow, utf8flag;
54	int				sl_fg, sl_bg, sr_fg, sr_bg;
55	int				sl_attr, sr_attr;
56
57	left = right = NULL;
58
59	/* No status line?*/
60	if (c->tty.sy == 0 || !options_get_number(&s->options, "status"))
61		return (1);
62	larrow = rarrow = 0;
63
64	/* Create the target screen. */
65	memcpy(&old_status, &c->status, sizeof old_status);
66	screen_init(&c->status, c->tty.sx, 1, 0);
67
68	if (gettimeofday(&c->status_timer, NULL) != 0)
69		fatal("gettimeofday failed");
70	memcpy(&stdgc, &grid_default_cell, sizeof gc);
71	colour_set_fg(&stdgc, options_get_number(&s->options, "status-fg"));
72	colour_set_bg(&stdgc, options_get_number(&s->options, "status-bg"));
73	stdgc.attr |= options_get_number(&s->options, "status-attr");
74
75	/*
76	 * Set the status-left and status-right parts to the default status
77	 * line options and only change them where they differ from the
78	 * defaults.
79	 */
80	memcpy(&sl_stdgc, &stdgc, sizeof sl_stdgc);
81	memcpy(&sr_stdgc, &stdgc, sizeof sr_stdgc);
82	sl_fg = options_get_number(&s->options, "status-left-fg");
83	if (sl_fg != 8)
84		colour_set_fg(&sl_stdgc, sl_fg);
85	sl_bg = options_get_number(&s->options, "status-left-bg");
86	if (sl_bg != 8)
87		colour_set_bg(&sl_stdgc, sl_bg);
88	sl_attr = options_get_number(&s->options, "status-left-attr");
89	if (sl_attr != 0)
90		sl_stdgc.attr = sl_attr;
91	sr_fg = options_get_number(&s->options, "status-right-fg");
92	if (sr_fg != 8)
93		colour_set_fg(&sr_stdgc, sr_fg);
94	sr_bg = options_get_number(&s->options, "status-right-bg");
95	if (sr_bg != 8)
96		colour_set_bg(&sr_stdgc, sr_bg);
97	sr_attr = options_get_number(&s->options, "status-right-attr");
98	if (sr_attr != 0)
99		sr_stdgc.attr = sr_attr;
100
101	yy = c->tty.sy - 1;
102	if (yy == 0)
103		goto blank;
104
105	/* Caring about UTF-8 in status line? */
106	utf8flag = options_get_number(&s->options, "status-utf8");
107
108	/* Work out the left and right strings. */
109	left = status_replace(c, options_get_string(
110	    &s->options, "status-left"), c->status_timer.tv_sec);
111	llen = options_get_number(&s->options, "status-left-length");
112	llen2 = screen_write_cstrlen(utf8flag, "%s", left);
113	if (llen2 < llen)
114		llen = llen2;
115
116	right = status_replace(c, options_get_string(
117	    &s->options, "status-right"), c->status_timer.tv_sec);
118	rlen = options_get_number(&s->options, "status-right-length");
119	rlen2 = screen_write_cstrlen(utf8flag, "%s", right);
120	if (rlen2 < rlen)
121		rlen = rlen2;
122
123	/*
124	 * Figure out how much space we have for the window list. If there isn't
125	 * enough space, just wimp out.
126	 */
127	xx = 0;
128	if (llen != 0)
129		xx += llen + 1;
130	if (rlen != 0)
131		xx += rlen + 1;
132	if (c->tty.sx == 0 || c->tty.sx <= xx)
133		goto blank;
134	xx = c->tty.sx - xx;
135
136	/*
137	 * Right. We have xx characters to fill. Find out how much is to go in
138	 * them and the offset of the current window (it must be on screen).
139	 */
140	width = offset = 0;
141	RB_FOREACH(wl, winlinks, &s->windows) {
142		size = status_width(wl) + 1;
143		if (wl == s->curw)
144			offset = width;
145		width += size;
146	}
147	start = 0;
148
149	/* If there is enough space for the total width, all is gravy. */
150	if (width <= xx)
151		goto draw;
152
153	/* Find size of current window text. */
154	size = status_width(s->curw);
155
156	/*
157	 * If the offset is already on screen, we're good to draw from the
158	 * start and just leave off the end.
159	 */
160	if (offset + size < xx) {
161		if (xx > 0) {
162			rarrow = 1;
163			xx--;
164		}
165
166		width = xx;
167		goto draw;
168	}
169
170	/*
171	 * Work out how many characters we need to omit from the start. There
172	 * are xx characters to fill, and offset + size must be the last. So,
173	 * the start character is offset + size - xx.
174	 */
175	if (xx > 0) {
176		larrow = 1;
177		xx--;
178	}
179
180	start = offset + size - xx;
181 	if (xx > 0 && width > start + xx + 1) { /* + 1, eh? */
182 		rarrow = 1;
183 		start++;
184 		xx--;
185 	}
186 	width = xx;
187
188draw:
189	/* Bail here if anything is too small too. XXX. */
190	if (width == 0 || xx == 0)
191		goto blank;
192
193 	/* Begin drawing and move to the starting position. */
194	screen_write_start(&ctx, NULL, &c->status);
195	if (llen != 0) {
196 		screen_write_cursormove(&ctx, 0, yy);
197		screen_write_cnputs(&ctx, llen, &sl_stdgc, utf8flag, "%s", left);
198		screen_write_putc(&ctx, &stdgc, ' ');
199		if (larrow)
200			screen_write_putc(&ctx, &stdgc, ' ');
201	} else {
202		if (larrow)
203			screen_write_cursormove(&ctx, 1, yy);
204		else
205			screen_write_cursormove(&ctx, 0, yy);
206	}
207
208	ox = 0;
209	if (width < xx) {
210		switch (options_get_number(&s->options, "status-justify")) {
211		case 1:	/* centered */
212			ox = 1 + (xx - width) / 2;
213			break;
214		case 2:	/* right */
215			ox = 1 + (xx - width);
216			break;
217		}
218		xx -= ox;
219		while (ox-- > 0)
220			screen_write_putc(&ctx, &stdgc, ' ');
221	}
222
223	/* Draw each character in succession. */
224	offset = 0;
225	RB_FOREACH(wl, winlinks, &s->windows) {
226		memcpy(&gc, &stdgc, sizeof gc);
227		text = status_print(s, wl, &gc);
228
229		if (larrow == 1 && offset < start) {
230			if (session_alert_has(s, wl, WINDOW_ACTIVITY))
231				larrow = -1;
232			else if (session_alert_has(s, wl, WINDOW_BELL))
233				larrow = -1;
234			else if (session_alert_has(s, wl, WINDOW_CONTENT))
235				larrow = -1;
236		}
237
238 		for (ptr = text; *ptr != '\0'; ptr++) {
239			if (offset >= start && offset < start + width)
240				screen_write_putc(&ctx, &gc, *ptr);
241			offset++;
242		}
243
244		if (rarrow == 1 && offset > start + width) {
245			if (session_alert_has(s, wl, WINDOW_ACTIVITY))
246				rarrow = -1;
247			else if (session_alert_has(s, wl, WINDOW_BELL))
248				rarrow = -1;
249			else if (session_alert_has(s, wl, WINDOW_CONTENT))
250				rarrow = -1;
251		}
252
253		if (offset < start + width) {
254			if (offset >= start) {
255				screen_write_putc(&ctx, &stdgc, ' ');
256			}
257			offset++;
258		}
259
260		xfree(text);
261	}
262
263	/* Fill the remaining space if any. */
264 	while (offset++ < xx)
265		screen_write_putc(&ctx, &stdgc, ' ');
266
267	/* Draw the last item. */
268	if (rlen != 0) {
269		screen_write_cursormove(&ctx, c->tty.sx - rlen - 1, yy);
270		screen_write_putc(&ctx, &stdgc, ' ');
271		screen_write_cnputs(&ctx, rlen, &sr_stdgc, utf8flag, "%s", right);
272	}
273
274	/* Draw the arrows. */
275	if (larrow != 0) {
276		memcpy(&gc, &stdgc, sizeof gc);
277		if (larrow == -1)
278			gc.attr ^= GRID_ATTR_REVERSE;
279		if (llen != 0)
280			screen_write_cursormove(&ctx, llen + 1, yy);
281		else
282			screen_write_cursormove(&ctx, 0, yy);
283		screen_write_putc(&ctx, &gc, '<');
284	}
285	if (rarrow != 0) {
286		memcpy(&gc, &stdgc, sizeof gc);
287		if (rarrow == -1)
288			gc.attr ^= GRID_ATTR_REVERSE;
289		if (rlen != 0)
290			screen_write_cursormove(&ctx, c->tty.sx - rlen - 2, yy);
291		else
292			screen_write_cursormove(&ctx, c->tty.sx - 1, yy);
293		screen_write_putc(&ctx, &gc, '>');
294	}
295
296	goto out;
297
298blank:
299 	/* Just draw the whole line as blank. */
300	screen_write_start(&ctx, NULL, &c->status);
301	screen_write_cursormove(&ctx, 0, yy);
302	for (offset = 0; offset < c->tty.sx; offset++)
303		screen_write_putc(&ctx, &stdgc, ' ');
304
305out:
306	screen_write_stop(&ctx);
307
308	if (left != NULL)
309		xfree(left);
310	if (right != NULL)
311		xfree(right);
312
313	if (grid_compare(c->status.grid, old_status.grid) == 0) {
314		screen_free(&old_status);
315		return (0);
316	}
317	screen_free(&old_status);
318	return (1);
319}
320
321char *
322status_replace(struct client *c, const char *fmt, time_t t)
323{
324	struct session *s = c->session;
325	struct winlink *wl = s->curw;
326	static char	out[BUFSIZ];
327	char		in[BUFSIZ], tmp[256], ch, *iptr, *optr, *ptr, *endptr;
328	char           *savedptr;	/* freed at end of each loop */
329	size_t		len;
330	long		n;
331
332
333	strftime(in, sizeof in, fmt, localtime(&t));
334	in[(sizeof in) - 1] = '\0';
335
336	iptr = in;
337	optr = out;
338	savedptr = NULL;
339
340	while (*iptr != '\0') {
341		if (optr >= out + (sizeof out) - 1)
342			break;
343		switch (ch = *iptr++) {
344		case '#':
345			errno = 0;
346			n = strtol(iptr, &endptr, 10);
347			if ((n == 0 && errno != EINVAL) ||
348			    (n == LONG_MIN && errno != ERANGE) ||
349			    (n == LONG_MAX && errno != ERANGE) ||
350			    n != 0)
351				iptr = endptr;
352			if (n <= 0)
353				n = LONG_MAX;
354
355			ptr = NULL;
356			switch (*iptr++) {
357			case '(':
358				if (ptr == NULL) {
359					ptr = status_job(c, &iptr);
360					if (ptr == NULL)
361						break;
362					savedptr = ptr;
363				}
364				/* FALLTHROUGH */
365			case 'H':
366				if (ptr == NULL) {
367					if (gethostname(tmp, sizeof tmp) != 0)
368						fatal("gethostname failed");
369					ptr = tmp;
370				}
371				/* FALLTHROUGH */
372			case 'I':
373				if (ptr == NULL) {
374					xsnprintf(tmp, sizeof tmp, "%d", wl->idx);
375					ptr = tmp;
376				}
377				/* FALLTHROUGH */
378			case 'P':
379				if (ptr == NULL) {
380					xsnprintf(tmp, sizeof tmp, "%u",
381					    window_pane_index(wl->window,
382					    wl->window->active));
383					ptr = tmp;
384				}
385				/* FALLTHROUGH */
386			case 'S':
387				if (ptr == NULL)
388					ptr = s->name;
389				/* FALLTHROUGH */
390			case 'T':
391				if (ptr == NULL)
392					ptr = wl->window->active->base.title;
393				/* FALLTHROUGH */
394			case 'W':
395				if (ptr == NULL)
396					ptr = wl->window->name;
397				len = strlen(ptr);
398				if ((size_t) n < len)
399					len = n;
400				if (optr + len >= out + (sizeof out) - 1)
401					break;
402				while (len > 0 && *ptr != '\0') {
403					*optr++ = *ptr++;
404					len--;
405				}
406				break;
407			case '[':
408				/*
409				 * Embedded style, handled at display time.
410				 * Leave present and skip input until ].
411				 */
412				*optr++ = '#';
413
414				iptr--;	/* include [ */
415				while (*iptr != ']' && *iptr != '\0') {
416					if (optr >= out + (sizeof out) - 1)
417						break;
418					*optr++ = *iptr++;
419				}
420				break;
421			case '#':
422				*optr++ = '#';
423				break;
424			}
425			if (savedptr != NULL) {
426				xfree(savedptr);
427				savedptr = NULL;
428			}
429			break;
430		default:
431			*optr++ = ch;
432			break;
433		}
434	}
435	*optr = '\0';
436
437	return (xstrdup(out));
438}
439
440char *
441status_job(struct client *c, char **iptr)
442{
443	struct job	*job;
444	char   		*cmd;
445	int		 lastesc;
446	size_t		 len;
447
448	if (**iptr == '\0')
449		return (NULL);
450	if (**iptr == ')') {		/* no command given */
451		(*iptr)++;
452		return (NULL);
453	}
454
455	cmd = xmalloc(strlen(*iptr) + 1);
456	len = 0;
457
458	lastesc = 0;
459	for (; **iptr != '\0'; (*iptr)++) {
460		if (!lastesc && **iptr == ')')
461			break;		/* unescaped ) is the end */
462		if (!lastesc && **iptr == '\\') {
463			lastesc = 1;
464			continue;	/* skip \ if not escaped */
465		}
466		lastesc = 0;
467		cmd[len++] = **iptr;
468	}
469	if (**iptr == '\0')		/* no terminating ) */ {
470		xfree(cmd);
471		return (NULL);
472	}
473	(*iptr)++;			/* skip final ) */
474	cmd[len] = '\0';
475
476	job = job_get(&c->status_jobs, cmd);
477	if (job == NULL) {
478		job = job_add(&c->status_jobs,
479		    JOB_PERSIST, c, cmd, status_job_callback, xfree, NULL);
480		job_run(job);
481	}
482	if (job->data == NULL)
483		return (xstrdup(""));
484	return (xstrdup(job->data));
485}
486
487void
488status_job_callback(struct job *job)
489{
490	char	*line, *buf;
491	size_t	 len;
492
493	buf = NULL;
494	if ((line = evbuffer_readline(job->event->input)) == NULL) {
495		len = EVBUFFER_LENGTH(job->event->input);
496		buf = xmalloc(len + 1);
497		if (len != 0)
498			memcpy(buf, EVBUFFER_DATA(job->event->input), len);
499		buf[len] = '\0';
500	}
501
502	if (job->data != NULL)
503		xfree(job->data);
504	else
505		server_redraw_client(job->client);
506	job->data = xstrdup(line);
507
508	if (buf != NULL)
509		xfree(buf);
510}
511
512size_t
513status_width(struct winlink *wl)
514{
515	return (xsnprintf(NULL, 0, "%d:%s ", wl->idx, wl->window->name));
516}
517
518char *
519status_print(struct session *s, struct winlink *wl, struct grid_cell *gc)
520{
521	struct options	*oo = &wl->window->options;
522	char   		*text, flag;
523	u_char		 fg, bg, attr;
524
525	fg = options_get_number(oo, "window-status-fg");
526	if (fg != 8)
527		colour_set_fg(gc, fg);
528	bg = options_get_number(oo, "window-status-bg");
529	if (bg != 8)
530		colour_set_bg(gc, bg);
531	attr = options_get_number(oo, "window-status-attr");
532	if (attr != 0)
533		gc->attr = attr;
534
535	flag = ' ';
536 	if (wl == TAILQ_FIRST(&s->lastw))
537		flag = '-';
538	if (wl == s->curw) {
539		fg = options_get_number(oo, "window-status-current-fg");
540		if (fg != 8)
541			colour_set_fg(gc, fg);
542		bg = options_get_number(oo, "window-status-current-bg");
543		if (bg != 8)
544			colour_set_bg(gc, bg);
545		attr = options_get_number(oo, "window-status-current-attr");
546		if (attr != 0)
547			gc->attr = attr;
548		flag = '*';
549	}
550
551	if (session_alert_has(s, wl, WINDOW_ACTIVITY)) {
552		flag = '#';
553		gc->attr ^= GRID_ATTR_REVERSE;
554	} else if (session_alert_has(s, wl, WINDOW_BELL)) {
555		flag = '!';
556		gc->attr ^= GRID_ATTR_REVERSE;
557	} else if (session_alert_has(s, wl, WINDOW_CONTENT)) {
558		flag = '+';
559		gc->attr ^= GRID_ATTR_REVERSE;
560	}
561
562	xasprintf(&text, "%d:%s%c", wl->idx, wl->window->name, flag);
563	return (text);
564}
565
566void printflike2
567status_message_set(struct client *c, const char *fmt, ...)
568{
569	struct timeval	tv;
570	va_list		ap;
571	int		delay;
572
573	status_prompt_clear(c);
574	status_message_clear(c);
575
576	va_start(ap, fmt);
577	xvasprintf(&c->message_string, fmt, ap);
578	va_end(ap);
579
580	delay = options_get_number(&c->session->options, "display-time");
581	tv.tv_sec = delay / 1000;
582	tv.tv_usec = (delay % 1000) * 1000L;
583
584	evtimer_del(&c->message_timer);
585	evtimer_set(&c->message_timer, status_message_callback, c);
586	evtimer_add(&c->message_timer, &tv);
587
588	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
589	c->flags |= CLIENT_STATUS;
590}
591
592void
593status_message_clear(struct client *c)
594{
595	if (c->message_string == NULL)
596		return;
597
598	xfree(c->message_string);
599	c->message_string = NULL;
600
601	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
602	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
603
604	screen_reinit(&c->status);
605}
606
607void
608status_message_callback(unused int fd, unused short event, void *data)
609{
610	struct client	*c = data;
611
612	status_message_clear(c);
613}
614
615/* Draw client message on status line of present else on last line. */
616int
617status_message_redraw(struct client *c)
618{
619	struct screen_write_ctx		ctx;
620	struct session		       *s = c->session;
621	struct screen		        old_status;
622	size_t			        len;
623	struct grid_cell		gc;
624
625	if (c->tty.sx == 0 || c->tty.sy == 0)
626		return (0);
627	memcpy(&old_status, &c->status, sizeof old_status);
628	screen_init(&c->status, c->tty.sx, 1, 0);
629
630	len = strlen(c->message_string);
631	if (len > c->tty.sx)
632		len = c->tty.sx;
633
634	memcpy(&gc, &grid_default_cell, sizeof gc);
635	colour_set_fg(&gc, options_get_number(&s->options, "message-fg"));
636	colour_set_bg(&gc, options_get_number(&s->options, "message-bg"));
637	gc.attr |= options_get_number(&s->options, "message-attr");
638
639	screen_write_start(&ctx, NULL, &c->status);
640
641	screen_write_cursormove(&ctx, 0, 0);
642	screen_write_puts(&ctx, &gc, "%.*s", (int) len, c->message_string);
643	for (; len < c->tty.sx; len++)
644		screen_write_putc(&ctx, &gc, ' ');
645
646	screen_write_stop(&ctx);
647
648	if (grid_compare(c->status.grid, old_status.grid) == 0) {
649		screen_free(&old_status);
650		return (0);
651	}
652	screen_free(&old_status);
653	return (1);
654}
655
656void
657status_prompt_set(struct client *c, const char *msg,
658    int (*callbackfn)(void *, const char *), void (*freefn)(void *),
659    void *data, int flags)
660{
661	int	keys;
662
663	status_message_clear(c);
664	status_prompt_clear(c);
665
666	c->prompt_string = xstrdup(msg);
667
668	c->prompt_buffer = xstrdup("");
669	c->prompt_index = 0;
670
671	c->prompt_callbackfn = callbackfn;
672	c->prompt_freefn = freefn;
673	c->prompt_data = data;
674
675	c->prompt_hindex = 0;
676
677	c->prompt_flags = flags;
678
679	keys = options_get_number(&c->session->options, "status-keys");
680	if (keys == MODEKEY_EMACS)
681		mode_key_init(&c->prompt_mdata, &mode_key_tree_emacs_edit);
682	else
683		mode_key_init(&c->prompt_mdata, &mode_key_tree_vi_edit);
684
685	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
686	c->flags |= CLIENT_STATUS;
687}
688
689void
690status_prompt_clear(struct client *c)
691{
692 	if (c->prompt_string == NULL)
693		return;
694
695	if (c->prompt_freefn != NULL && c->prompt_data != NULL)
696		c->prompt_freefn(c->prompt_data);
697
698	xfree(c->prompt_string);
699	c->prompt_string = NULL;
700
701	xfree(c->prompt_buffer);
702	c->prompt_buffer = NULL;
703
704	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
705	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
706
707	screen_reinit(&c->status);
708}
709
710void
711status_prompt_update(struct client *c, const char *msg)
712{
713	xfree(c->prompt_string);
714	c->prompt_string = xstrdup(msg);
715
716	*c->prompt_buffer = '\0';
717	c->prompt_index = 0;
718
719	c->prompt_hindex = 0;
720
721	c->flags |= CLIENT_STATUS;
722}
723
724/* Draw client prompt on status line of present else on last line. */
725int
726status_prompt_redraw(struct client *c)
727{
728	struct screen_write_ctx	ctx;
729	struct session		       *s = c->session;
730	struct screen		        old_status;
731	size_t			        i, size, left, len, off;
732	char				ch;
733	struct grid_cell		gc;
734
735	if (c->tty.sx == 0 || c->tty.sy == 0)
736		return (0);
737	memcpy(&old_status, &c->status, sizeof old_status);
738	screen_init(&c->status, c->tty.sx, 1, 0);
739	off = 0;
740
741	len = strlen(c->prompt_string);
742	if (len > c->tty.sx)
743		len = c->tty.sx;
744
745	memcpy(&gc, &grid_default_cell, sizeof gc);
746	colour_set_fg(&gc, options_get_number(&s->options, "message-fg"));
747	colour_set_bg(&gc, options_get_number(&s->options, "message-bg"));
748	gc.attr |= options_get_number(&s->options, "message-attr");
749
750	screen_write_start(&ctx, NULL, &c->status);
751
752	screen_write_cursormove(&ctx, 0, 0);
753	screen_write_puts(&ctx, &gc, "%.*s", (int) len, c->prompt_string);
754
755	left = c->tty.sx - len;
756	if (left != 0) {
757		if (c->prompt_index < left)
758			size = strlen(c->prompt_buffer);
759		else {
760			off = c->prompt_index - left + 1;
761			if (c->prompt_index == strlen(c->prompt_buffer))
762				left--;
763			size = left;
764		}
765		screen_write_puts(
766		    &ctx, &gc, "%.*s", (int) left, c->prompt_buffer + off);
767
768		for (i = len + size; i < c->tty.sx; i++)
769			screen_write_putc(&ctx, &gc, ' ');
770
771		/* Draw a fake cursor. */
772		ch = ' ';
773		screen_write_cursormove(&ctx, len + c->prompt_index - off, 0);
774		if (c->prompt_index < strlen(c->prompt_buffer))
775			ch = c->prompt_buffer[c->prompt_index];
776		gc.attr ^= GRID_ATTR_REVERSE;
777		screen_write_putc(&ctx, &gc, ch);
778	}
779
780	screen_write_stop(&ctx);
781
782	if (grid_compare(c->status.grid, old_status.grid) == 0) {
783		screen_free(&old_status);
784		return (0);
785	}
786	screen_free(&old_status);
787	return (1);
788}
789
790/* Handle keys in prompt. */
791void
792status_prompt_key(struct client *c, int key)
793{
794	struct paste_buffer	*pb;
795	char   			*s, *first, *last, word[64], swapc;
796	size_t			 size, n, off, idx;
797
798	size = strlen(c->prompt_buffer);
799	switch (mode_key_lookup(&c->prompt_mdata, key)) {
800	case MODEKEYEDIT_CURSORLEFT:
801		if (c->prompt_index > 0) {
802			c->prompt_index--;
803			c->flags |= CLIENT_STATUS;
804		}
805		break;
806	case MODEKEYEDIT_SWITCHMODEAPPEND:
807	case MODEKEYEDIT_CURSORRIGHT:
808		if (c->prompt_index < size) {
809			c->prompt_index++;
810			c->flags |= CLIENT_STATUS;
811		}
812		break;
813	case MODEKEYEDIT_STARTOFLINE:
814		if (c->prompt_index != 0) {
815			c->prompt_index = 0;
816			c->flags |= CLIENT_STATUS;
817		}
818		break;
819	case MODEKEYEDIT_ENDOFLINE:
820		if (c->prompt_index != size) {
821			c->prompt_index = size;
822			c->flags |= CLIENT_STATUS;
823		}
824		break;
825	case MODEKEYEDIT_COMPLETE:
826		if (*c->prompt_buffer == '\0')
827			break;
828
829		idx = c->prompt_index;
830		if (idx != 0)
831			idx--;
832
833		/* Find the word we are in. */
834		first = c->prompt_buffer + idx;
835		while (first > c->prompt_buffer && *first != ' ')
836			first--;
837		while (*first == ' ')
838			first++;
839		last = c->prompt_buffer + idx;
840		while (*last != '\0' && *last != ' ')
841			last++;
842		while (*last == ' ')
843			last--;
844		if (*last != '\0')
845			last++;
846		if (last <= first ||
847		    ((size_t) (last - first)) > (sizeof word) - 1)
848			break;
849		memcpy(word, first, last - first);
850		word[last - first] = '\0';
851
852		/* And try to complete it. */
853		if ((s = status_prompt_complete(word)) == NULL)
854			break;
855
856		/* Trim out word. */
857		n = size - (last - c->prompt_buffer) + 1; /* with \0 */
858		memmove(first, last, n);
859		size -= last - first;
860
861		/* Insert the new word. */
862 		size += strlen(s);
863		off = first - c->prompt_buffer;
864 		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 1);
865		first = c->prompt_buffer + off;
866 		memmove(first + strlen(s), first, n);
867 		memcpy(first, s, strlen(s));
868
869		c->prompt_index = (first - c->prompt_buffer) + strlen(s);
870		xfree(s);
871
872		c->flags |= CLIENT_STATUS;
873		break;
874	case MODEKEYEDIT_BACKSPACE:
875		if (c->prompt_index != 0) {
876			if (c->prompt_index == size)
877				c->prompt_buffer[--c->prompt_index] = '\0';
878			else {
879				memmove(c->prompt_buffer + c->prompt_index - 1,
880				    c->prompt_buffer + c->prompt_index,
881				    size + 1 - c->prompt_index);
882				c->prompt_index--;
883			}
884			c->flags |= CLIENT_STATUS;
885		}
886		break;
887 	case MODEKEYEDIT_DELETE:
888		if (c->prompt_index != size) {
889			memmove(c->prompt_buffer + c->prompt_index,
890			    c->prompt_buffer + c->prompt_index + 1,
891			    size + 1 - c->prompt_index);
892			c->flags |= CLIENT_STATUS;
893		}
894		break;
895	case MODEKEYEDIT_DELETELINE:
896		*c->prompt_buffer = '\0';
897		c->prompt_index = 0;
898		c->flags |= CLIENT_STATUS;
899		break;
900	case MODEKEYEDIT_DELETETOENDOFLINE:
901		if (c->prompt_index < size) {
902			c->prompt_buffer[c->prompt_index] = '\0';
903			c->flags |= CLIENT_STATUS;
904		}
905		break;
906	case MODEKEYEDIT_HISTORYUP:
907		if (ARRAY_LENGTH(&c->prompt_hdata) == 0)
908			break;
909	       	xfree(c->prompt_buffer);
910
911		c->prompt_buffer = xstrdup(ARRAY_ITEM(&c->prompt_hdata,
912		    ARRAY_LENGTH(&c->prompt_hdata) - 1 - c->prompt_hindex));
913		if (c->prompt_hindex != ARRAY_LENGTH(&c->prompt_hdata) - 1)
914			c->prompt_hindex++;
915
916		c->prompt_index = strlen(c->prompt_buffer);
917		c->flags |= CLIENT_STATUS;
918		break;
919	case MODEKEYEDIT_HISTORYDOWN:
920		xfree(c->prompt_buffer);
921
922		if (c->prompt_hindex != 0) {
923			c->prompt_hindex--;
924			c->prompt_buffer = xstrdup(ARRAY_ITEM(
925			    &c->prompt_hdata, ARRAY_LENGTH(
926			    &c->prompt_hdata) - 1 - c->prompt_hindex));
927		} else
928			c->prompt_buffer = xstrdup("");
929
930		c->prompt_index = strlen(c->prompt_buffer);
931		c->flags |= CLIENT_STATUS;
932		break;
933	case MODEKEYEDIT_PASTE:
934		if ((pb = paste_get_top(&c->session->buffers)) == NULL)
935			break;
936		for (n = 0; n < pb->size; n++) {
937			if (pb->data[n] < 32 || pb->data[n] == 127)
938				break;
939		}
940
941		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + n + 1);
942		if (c->prompt_index == size) {
943			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
944			c->prompt_index += n;
945			c->prompt_buffer[c->prompt_index] = '\0';
946		} else {
947			memmove(c->prompt_buffer + c->prompt_index + n,
948			    c->prompt_buffer + c->prompt_index,
949			    size + 1 - c->prompt_index);
950			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
951			c->prompt_index += n;
952		}
953
954		c->flags |= CLIENT_STATUS;
955		break;
956	case MODEKEYEDIT_TRANSPOSECHARS:
957		idx = c->prompt_index;
958		if (idx < size)
959			idx++;
960		if (idx >= 2) {
961			swapc = c->prompt_buffer[idx - 2];
962			c->prompt_buffer[idx - 2] = c->prompt_buffer[idx - 1];
963			c->prompt_buffer[idx - 1] = swapc;
964			c->prompt_index = idx;
965			c->flags |= CLIENT_STATUS;
966		}
967		break;
968 	case MODEKEYEDIT_ENTER:
969		if (*c->prompt_buffer != '\0')
970			status_prompt_add_history(c);
971		if (c->prompt_callbackfn(c->prompt_data, c->prompt_buffer) == 0)
972			status_prompt_clear(c);
973		break;
974	case MODEKEYEDIT_CANCEL:
975		if (c->prompt_callbackfn(c->prompt_data, NULL) == 0)
976			status_prompt_clear(c);
977		break;
978	case MODEKEY_OTHER:
979		if (key < 32 || key == 127)
980			break;
981		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 2);
982
983		if (c->prompt_index == size) {
984			c->prompt_buffer[c->prompt_index++] = key;
985			c->prompt_buffer[c->prompt_index] = '\0';
986		} else {
987			memmove(c->prompt_buffer + c->prompt_index + 1,
988			    c->prompt_buffer + c->prompt_index,
989			    size + 1 - c->prompt_index);
990			c->prompt_buffer[c->prompt_index++] = key;
991		}
992
993		if (c->prompt_flags & PROMPT_SINGLE) {
994			if (c->prompt_callbackfn(
995			    c->prompt_data, c->prompt_buffer) == 0)
996				status_prompt_clear(c);
997		}
998
999		c->flags |= CLIENT_STATUS;
1000		break;
1001	default:
1002		break;
1003	}
1004}
1005
1006/* Add line to the history. */
1007void
1008status_prompt_add_history(struct client *c)
1009{
1010	if (ARRAY_LENGTH(&c->prompt_hdata) > 0 &&
1011	    strcmp(ARRAY_LAST(&c->prompt_hdata), c->prompt_buffer) == 0)
1012		return;
1013
1014	if (ARRAY_LENGTH(&c->prompt_hdata) == PROMPT_HISTORY) {
1015		xfree(ARRAY_FIRST(&c->prompt_hdata));
1016		ARRAY_REMOVE(&c->prompt_hdata, 0);
1017	}
1018
1019	ARRAY_ADD(&c->prompt_hdata, xstrdup(c->prompt_buffer));
1020}
1021
1022/* Complete word. */
1023char *
1024status_prompt_complete(const char *s)
1025{
1026	const struct cmd_entry 	      **cmdent;
1027	const struct set_option_entry  *optent;
1028	ARRAY_DECL(, const char *)	list;
1029	char			       *prefix, *s2;
1030	u_int				i;
1031	size_t			 	j;
1032
1033	if (*s == '\0')
1034		return (NULL);
1035
1036	/* First, build a list of all the possible matches. */
1037	ARRAY_INIT(&list);
1038	for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
1039		if (strncmp((*cmdent)->name, s, strlen(s)) == 0)
1040			ARRAY_ADD(&list, (*cmdent)->name);
1041	}
1042	for (optent = set_option_table; optent->name != NULL; optent++) {
1043		if (strncmp(optent->name, s, strlen(s)) == 0)
1044			ARRAY_ADD(&list, optent->name);
1045	}
1046	for (optent = set_window_option_table; optent->name != NULL; optent++) {
1047		if (strncmp(optent->name, s, strlen(s)) == 0)
1048			ARRAY_ADD(&list, optent->name);
1049	}
1050
1051	/* If none, bail now. */
1052	if (ARRAY_LENGTH(&list) == 0) {
1053		ARRAY_FREE(&list);
1054		return (NULL);
1055	}
1056
1057	/* If an exact match, return it, with a trailing space. */
1058	if (ARRAY_LENGTH(&list) == 1) {
1059		xasprintf(&s2, "%s ", ARRAY_FIRST(&list));
1060		ARRAY_FREE(&list);
1061		return (s2);
1062	}
1063
1064	/* Now loop through the list and find the longest common prefix. */
1065	prefix = xstrdup(ARRAY_FIRST(&list));
1066	for (i = 1; i < ARRAY_LENGTH(&list); i++) {
1067		s = ARRAY_ITEM(&list, i);
1068
1069		j = strlen(s);
1070		if (j > strlen(prefix))
1071			j = strlen(prefix);
1072		for (; j > 0; j--) {
1073			if (prefix[j - 1] != s[j - 1])
1074				prefix[j - 1] = '\0';
1075		}
1076	}
1077
1078	ARRAY_FREE(&list);
1079	return (prefix);
1080}
1081