status.c revision 1.120 
1/* $OpenBSD: status.c,v 1.120 2015/02/01 23:43:23 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_redraw_get_left(
33	    struct client *, time_t, int, struct grid_cell *, size_t *);
34char   *status_redraw_get_right(
35	    struct client *, time_t, int, struct grid_cell *, size_t *);
36char   *status_find_job(struct client *, char **);
37void	status_job_free(void *);
38void	status_job_callback(struct job *);
39char   *status_print(
40	    struct client *, struct winlink *, time_t, struct grid_cell *);
41void	status_replace1(struct client *, char **, char **, char *, size_t, int);
42void	status_message_callback(int, short, void *);
43
44const char *status_prompt_up_history(u_int *);
45const char *status_prompt_down_history(u_int *);
46void	status_prompt_add_history(const char *);
47char   *status_prompt_complete(const char *);
48
49/* Status prompt history. */
50ARRAY_DECL(, char *) status_prompt_history = ARRAY_INITIALIZER;
51
52/* Status output tree. */
53RB_GENERATE(status_out_tree, status_out, entry, status_out_cmp);
54
55/* Output tree comparison function. */
56int
57status_out_cmp(struct status_out *so1, struct status_out *so2)
58{
59	return (strcmp(so1->cmd, so2->cmd));
60}
61
62/* Get screen line of status line. -1 means off. */
63int
64status_at_line(struct client *c)
65{
66	struct session	*s = c->session;
67
68	if (!options_get_number(&s->options, "status"))
69		return (-1);
70
71	if (options_get_number(&s->options, "status-position") == 0)
72		return (0);
73	return (c->tty.sy - 1);
74}
75
76/* Retrieve options for left string. */
77char *
78status_redraw_get_left(struct client *c, time_t t, int utf8flag,
79    struct grid_cell *gc, size_t *size)
80{
81	struct session	*s = c->session;
82	const char	*template;
83	char		*left;
84	size_t		 leftlen;
85
86	style_apply_update(gc, &s->options, "status-left-style");
87
88	template = options_get_string(&s->options, "status-left");
89	left = status_replace(c, NULL, template , t, 1);
90
91	*size = options_get_number(&s->options, "status-left-length");
92	leftlen = screen_write_cstrlen(utf8flag, "%s", left);
93	if (leftlen < *size)
94		*size = leftlen;
95	return (left);
96}
97
98/* Retrieve options for right string. */
99char *
100status_redraw_get_right(struct client *c, time_t t, int utf8flag,
101    struct grid_cell *gc, size_t *size)
102{
103	struct session	*s = c->session;
104	const char	*template;
105	char		*right;
106	size_t		 rightlen;
107
108	style_apply_update(gc, &s->options, "status-right-style");
109
110	template = options_get_string(&s->options, "status-right");
111	right = status_replace(c, NULL, template, t, 1);
112
113	*size = options_get_number(&s->options, "status-right-length");
114	rightlen = screen_write_cstrlen(utf8flag, "%s", right);
115	if (rightlen < *size)
116		*size = rightlen;
117	return (right);
118}
119
120/* Set window at window list position. */
121void
122status_set_window_at(struct client *c, u_int x)
123{
124	struct session	*s = c->session;
125	struct winlink	*wl;
126	struct options	*oo;
127	size_t		 len;
128
129	x += c->wlmouse;
130	RB_FOREACH(wl, winlinks, &s->windows) {
131		oo = &wl->window->options;
132
133		len = strlen(options_get_string(oo, "window-status-separator"));
134		if (x < wl->status_width && session_select(s, wl->idx) == 0)
135			server_redraw_session(s);
136		x -= wl->status_width + len;
137	}
138}
139
140/* Draw status for client on the last lines of given context. */
141int
142status_redraw(struct client *c)
143{
144	struct screen_write_ctx	ctx;
145	struct session	       *s = c->session;
146	struct winlink	       *wl;
147	struct screen		old_status, window_list;
148	struct grid_cell	stdgc, lgc, rgc, gc;
149	struct options	       *oo;
150	time_t			t;
151	char		       *left, *right, *sep;
152	u_int			offset, needed;
153	u_int			wlstart, wlwidth, wlavailable, wloffset, wlsize;
154	size_t			llen, rlen, seplen;
155	int			larrow, rarrow, utf8flag;
156
157	/* No status line? */
158	if (c->tty.sy == 0 || !options_get_number(&s->options, "status"))
159		return (1);
160	left = right = NULL;
161	larrow = rarrow = 0;
162
163	/* Update status timer. */
164	if (gettimeofday(&c->status_timer, NULL) != 0)
165		fatal("gettimeofday failed");
166	t = c->status_timer.tv_sec;
167
168	/* Set up default colour. */
169	style_apply(&stdgc, &s->options, "status-style");
170
171	/* Create the target screen. */
172	memcpy(&old_status, &c->status, sizeof old_status);
173	screen_init(&c->status, c->tty.sx, 1, 0);
174	screen_write_start(&ctx, NULL, &c->status);
175	for (offset = 0; offset < c->tty.sx; offset++)
176		screen_write_putc(&ctx, &stdgc, ' ');
177	screen_write_stop(&ctx);
178
179	/* If the height is one line, blank status line. */
180	if (c->tty.sy <= 1)
181		goto out;
182
183	/* Get UTF-8 flag. */
184	utf8flag = options_get_number(&s->options, "status-utf8");
185
186	/* Work out left and right strings. */
187	memcpy(&lgc, &stdgc, sizeof lgc);
188	left = status_redraw_get_left(c, t, utf8flag, &lgc, &llen);
189	memcpy(&rgc, &stdgc, sizeof rgc);
190	right = status_redraw_get_right(c, t, utf8flag, &rgc, &rlen);
191
192	/*
193	 * Figure out how much space we have for the window list. If there
194	 * isn't enough space, just show a blank status line.
195	 */
196	needed = 0;
197	if (llen != 0)
198		needed += llen;
199	if (rlen != 0)
200		needed += rlen;
201	if (c->tty.sx == 0 || c->tty.sx <= needed)
202		goto out;
203	wlavailable = c->tty.sx - needed;
204
205	/* Calculate the total size needed for the window list. */
206	wlstart = wloffset = wlwidth = 0;
207	RB_FOREACH(wl, winlinks, &s->windows) {
208		free(wl->status_text);
209		memcpy(&wl->status_cell, &stdgc, sizeof wl->status_cell);
210		wl->status_text = status_print(c, wl, t, &wl->status_cell);
211		wl->status_width =
212		    screen_write_cstrlen(utf8flag, "%s", wl->status_text);
213
214		if (wl == s->curw)
215			wloffset = wlwidth;
216
217		oo = &wl->window->options;
218		sep = options_get_string(oo, "window-status-separator");
219		seplen = screen_write_strlen(utf8flag, "%s", sep);
220		wlwidth += wl->status_width + seplen;
221	}
222
223	/* Create a new screen for the window list. */
224	screen_init(&window_list, wlwidth, 1, 0);
225
226	/* And draw the window list into it. */
227	screen_write_start(&ctx, NULL, &window_list);
228	RB_FOREACH(wl, winlinks, &s->windows) {
229		screen_write_cnputs(&ctx,
230		    -1, &wl->status_cell, utf8flag, "%s", wl->status_text);
231
232		oo = &wl->window->options;
233		sep = options_get_string(oo, "window-status-separator");
234		screen_write_nputs(&ctx, -1, &stdgc, utf8flag, "%s", sep);
235	}
236	screen_write_stop(&ctx);
237
238	/* If there is enough space for the total width, skip to draw now. */
239	if (wlwidth <= wlavailable)
240		goto draw;
241
242	/* Find size of current window text. */
243	wlsize = s->curw->status_width;
244
245	/*
246	 * If the current window is already on screen, good to draw from the
247	 * start and just leave off the end.
248	 */
249	if (wloffset + wlsize < wlavailable) {
250		if (wlavailable > 0) {
251			rarrow = 1;
252			wlavailable--;
253		}
254		wlwidth = wlavailable;
255	} else {
256		/*
257		 * Work out how many characters we need to omit from the
258		 * start. There are wlavailable characters to fill, and
259		 * wloffset + wlsize must be the last. So, the start character
260		 * is wloffset + wlsize - wlavailable.
261		 */
262		if (wlavailable > 0) {
263			larrow = 1;
264			wlavailable--;
265		}
266
267		wlstart = wloffset + wlsize - wlavailable;
268		if (wlavailable > 0 && wlwidth > wlstart + wlavailable + 1) {
269			rarrow = 1;
270			wlstart++;
271			wlavailable--;
272		}
273		wlwidth = wlavailable;
274	}
275
276	/* Bail if anything is now too small too. */
277	if (wlwidth == 0 || wlavailable == 0) {
278		screen_free(&window_list);
279		goto out;
280	}
281
282	/*
283	 * Now the start position is known, work out the state of the left and
284	 * right arrows.
285	 */
286	offset = 0;
287	RB_FOREACH(wl, winlinks, &s->windows) {
288		if (wl->flags & WINLINK_ALERTFLAGS &&
289		    larrow == 1 && offset < wlstart)
290			larrow = -1;
291
292		offset += wl->status_width;
293
294		if (wl->flags & WINLINK_ALERTFLAGS &&
295		    rarrow == 1 && offset > wlstart + wlwidth)
296			rarrow = -1;
297	}
298
299draw:
300	/* Begin drawing. */
301	screen_write_start(&ctx, NULL, &c->status);
302
303	/* Draw the left string and arrow. */
304	screen_write_cursormove(&ctx, 0, 0);
305	if (llen != 0)
306		screen_write_cnputs(&ctx, llen, &lgc, utf8flag, "%s", left);
307	if (larrow != 0) {
308		memcpy(&gc, &stdgc, sizeof gc);
309		if (larrow == -1)
310			gc.attr ^= GRID_ATTR_REVERSE;
311		screen_write_putc(&ctx, &gc, '<');
312	}
313
314	/* Draw the right string and arrow. */
315	if (rarrow != 0) {
316		screen_write_cursormove(&ctx, c->tty.sx - rlen - 1, 0);
317		memcpy(&gc, &stdgc, sizeof gc);
318		if (rarrow == -1)
319			gc.attr ^= GRID_ATTR_REVERSE;
320		screen_write_putc(&ctx, &gc, '>');
321	} else
322		screen_write_cursormove(&ctx, c->tty.sx - rlen, 0);
323	if (rlen != 0)
324		screen_write_cnputs(&ctx, rlen, &rgc, utf8flag, "%s", right);
325
326	/* Figure out the offset for the window list. */
327	if (llen != 0)
328		wloffset = llen;
329	else
330		wloffset = 0;
331	if (wlwidth < wlavailable) {
332		switch (options_get_number(&s->options, "status-justify")) {
333		case 1:	/* centred */
334			wloffset += (wlavailable - wlwidth) / 2;
335			break;
336		case 2:	/* right */
337			wloffset += (wlavailable - wlwidth);
338			break;
339		}
340	}
341	if (larrow != 0)
342		wloffset++;
343
344	/* Copy the window list. */
345	c->wlmouse = -wloffset + wlstart;
346	screen_write_cursormove(&ctx, wloffset, 0);
347	screen_write_copy(&ctx, &window_list, wlstart, 0, wlwidth, 1);
348	screen_free(&window_list);
349
350	screen_write_stop(&ctx);
351
352out:
353	free(left);
354	free(right);
355
356	if (grid_compare(c->status.grid, old_status.grid) == 0) {
357		screen_free(&old_status);
358		return (0);
359	}
360	screen_free(&old_status);
361	return (1);
362}
363
364/* Replace a single special sequence (prefixed by #). */
365void
366status_replace1(struct client *c, char **iptr, char **optr, char *out,
367    size_t outsize, int jobsflag)
368{
369	char	ch, tmp[256], *ptr, *endptr;
370	size_t	ptrlen;
371	long	limit;
372
373	errno = 0;
374	limit = strtol(*iptr, &endptr, 10);
375	if ((limit == 0 && errno != EINVAL) ||
376	    (limit == LONG_MIN && errno != ERANGE) ||
377	    (limit == LONG_MAX && errno != ERANGE) ||
378	    limit != 0)
379		*iptr = endptr;
380	if (limit <= 0)
381		limit = LONG_MAX;
382
383	switch (*(*iptr)++) {
384	case '(':
385		if (!jobsflag) {
386			ch = ')';
387			goto skip_to;
388		}
389		if ((ptr = status_find_job(c, iptr)) == NULL)
390			return;
391		goto do_replace;
392	case '[':
393		/*
394		 * Embedded style, handled at display time. Leave present and
395		 * skip input until ].
396		 */
397		ch = ']';
398		goto skip_to;
399	case '{':
400		ptr = (char *) "#{";
401		goto do_replace;
402	default:
403		xsnprintf(tmp, sizeof tmp, "#%c", *(*iptr - 1));
404		ptr = tmp;
405		goto do_replace;
406	}
407
408	return;
409
410do_replace:
411	ptrlen = strlen(ptr);
412	if ((size_t) limit < ptrlen)
413		ptrlen = limit;
414
415	if (*optr + ptrlen >= out + outsize - 1)
416		return;
417	while (ptrlen > 0 && *ptr != '\0') {
418		*(*optr)++ = *ptr++;
419		ptrlen--;
420	}
421
422	return;
423
424skip_to:
425	*(*optr)++ = '#';
426
427	(*iptr)--;	/* include ch */
428	while (**iptr != ch && **iptr != '\0') {
429		if (*optr >=  out + outsize - 1)
430			break;
431		*(*optr)++ = *(*iptr)++;
432	}
433}
434
435/* Replace special sequences in fmt. */
436char *
437status_replace(struct client *c, struct winlink *wl, const char *fmt, time_t t,
438    int jobsflag)
439{
440	struct session		*s = NULL;
441	struct window_pane	*wp = NULL;
442	static char		 out[BUFSIZ];
443	char			 in[BUFSIZ], ch, *iptr, *optr, *expanded;
444	size_t			 len;
445	struct format_tree	*ft;
446
447	if (fmt == NULL)
448		return (xstrdup(""));
449
450	if (c != NULL)
451		s = c->session;
452	if (wl == NULL && s != NULL)
453		wl = s->curw;
454	if (wl != NULL)
455		wp = wl->window->active;
456
457	len = strftime(in, sizeof in, fmt, localtime(&t));
458	in[len] = '\0';
459
460	iptr = in;
461	optr = out;
462
463	while (*iptr != '\0') {
464		if (optr >= out + (sizeof out) - 1)
465			break;
466		ch = *iptr++;
467
468		if (ch != '#' || *iptr == '\0') {
469			*optr++ = ch;
470			continue;
471		}
472		status_replace1(c, &iptr, &optr, out, sizeof out, jobsflag);
473	}
474	*optr = '\0';
475
476	ft = format_create();
477	if (c != NULL)
478		format_client(ft, c);
479	if (s != NULL)
480		format_session(ft, s);
481	if (s != NULL && wl != NULL)
482		format_winlink(ft, s, wl);
483	if (wp != NULL)
484		format_window_pane(ft, wp);
485	expanded = format_expand(ft, out);
486	format_free(ft);
487	return (expanded);
488}
489
490/* Figure out job name and get its result, starting it off if necessary. */
491char *
492status_find_job(struct client *c, char **iptr)
493{
494	struct status_out	*so, so_find;
495	char   			*cmd;
496	int			 lastesc;
497	size_t			 len;
498
499	if (**iptr == '\0')
500		return (NULL);
501	if (**iptr == ')') {		/* no command given */
502		(*iptr)++;
503		return (NULL);
504	}
505
506	cmd = xmalloc(strlen(*iptr) + 1);
507	len = 0;
508
509	lastesc = 0;
510	for (; **iptr != '\0'; (*iptr)++) {
511		if (!lastesc && **iptr == ')')
512			break;		/* unescaped ) is the end */
513		if (!lastesc && **iptr == '\\') {
514			lastesc = 1;
515			continue;	/* skip \ if not escaped */
516		}
517		lastesc = 0;
518		cmd[len++] = **iptr;
519	}
520	if (**iptr == '\0')		/* no terminating ) */ {
521		free(cmd);
522		return (NULL);
523	}
524	(*iptr)++;			/* skip final ) */
525	cmd[len] = '\0';
526
527	/* First try in the new tree. */
528	so_find.cmd = cmd;
529	so = RB_FIND(status_out_tree, &c->status_new, &so_find);
530	if (so != NULL && so->out != NULL) {
531		free(cmd);
532		return (so->out);
533	}
534
535	/* If not found at all, start the job and add to the tree. */
536	if (so == NULL) {
537		job_run(cmd, NULL, status_job_callback, status_job_free, c);
538		c->references++;
539
540		so = xmalloc(sizeof *so);
541		so->cmd = xstrdup(cmd);
542		so->out = NULL;
543		RB_INSERT(status_out_tree, &c->status_new, so);
544	}
545
546	/* Lookup in the old tree. */
547	so_find.cmd = cmd;
548	so = RB_FIND(status_out_tree, &c->status_old, &so_find);
549	free(cmd);
550	if (so != NULL)
551		return (so->out);
552	return (NULL);
553}
554
555/* Free job tree. */
556void
557status_free_jobs(struct status_out_tree *sotree)
558{
559	struct status_out	*so, *so_next;
560
561	so_next = RB_MIN(status_out_tree, sotree);
562	while (so_next != NULL) {
563		so = so_next;
564		so_next = RB_NEXT(status_out_tree, sotree, so);
565
566		RB_REMOVE(status_out_tree, sotree, so);
567		free(so->out);
568		free(so->cmd);
569		free(so);
570	}
571}
572
573/* Update jobs on status interval. */
574void
575status_update_jobs(struct client *c)
576{
577	/* Free the old tree. */
578	status_free_jobs(&c->status_old);
579
580	/* Move the new to old. */
581	memcpy(&c->status_old, &c->status_new, sizeof c->status_old);
582	RB_INIT(&c->status_new);
583}
584
585/* Free status job. */
586void
587status_job_free(void *data)
588{
589	struct client	*c = data;
590
591	c->references--;
592}
593
594/* Job has finished: save its result. */
595void
596status_job_callback(struct job *job)
597{
598	struct client		*c = job->data;
599	struct status_out	*so, so_find;
600	char			*line, *buf;
601	size_t			 len;
602
603	if (c->flags & CLIENT_DEAD)
604		return;
605
606	so_find.cmd = job->cmd;
607	so = RB_FIND(status_out_tree, &c->status_new, &so_find);
608	if (so == NULL || so->out != NULL)
609		return;
610
611	buf = NULL;
612	if ((line = evbuffer_readline(job->event->input)) == NULL) {
613		len = EVBUFFER_LENGTH(job->event->input);
614		buf = xmalloc(len + 1);
615		if (len != 0)
616			memcpy(buf, EVBUFFER_DATA(job->event->input), len);
617		buf[len] = '\0';
618	} else
619		buf = line;
620
621	so->out = buf;
622	server_status_client(c);
623}
624
625/* Return winlink status line entry and adjust gc as necessary. */
626char *
627status_print(struct client *c, struct winlink *wl, time_t t,
628    struct grid_cell *gc)
629{
630	struct options	*oo = &wl->window->options;
631	struct session	*s = c->session;
632	const char	*fmt;
633	char   		*text;
634
635	style_apply_update(gc, oo, "window-status-style");
636	fmt = options_get_string(oo, "window-status-format");
637	if (wl == s->curw) {
638		style_apply_update(gc, oo, "window-status-current-style");
639		fmt = options_get_string(oo, "window-status-current-format");
640	}
641	if (wl == TAILQ_FIRST(&s->lastw))
642		style_apply_update(gc, oo, "window-status-last-style");
643
644	if (wl->flags & WINLINK_BELL)
645		style_apply_update(gc, oo, "window-status-bell-style");
646	else if (wl->flags & (WINLINK_ACTIVITY|WINLINK_SILENCE))
647		style_apply_update(gc, oo, "window-status-activity-style");
648
649	text = status_replace(c, wl, fmt, t, 1);
650	return (text);
651}
652
653/* Set a status line message. */
654void
655status_message_set(struct client *c, const char *fmt, ...)
656{
657	struct timeval		 tv;
658	struct message_entry	*msg;
659	va_list			 ap;
660	int			 delay;
661	u_int			 i, limit;
662
663	status_prompt_clear(c);
664	status_message_clear(c);
665
666	va_start(ap, fmt);
667	xvasprintf(&c->message_string, fmt, ap);
668	va_end(ap);
669
670	ARRAY_EXPAND(&c->message_log, 1);
671	msg = &ARRAY_LAST(&c->message_log);
672	msg->msg_time = time(NULL);
673	msg->msg = xstrdup(c->message_string);
674
675	limit = options_get_number(&global_options, "message-limit");
676	if (ARRAY_LENGTH(&c->message_log) > limit) {
677		limit = ARRAY_LENGTH(&c->message_log) - limit;
678		for (i = 0; i < limit; i++) {
679			msg = &ARRAY_FIRST(&c->message_log);
680			free(msg->msg);
681			ARRAY_REMOVE(&c->message_log, 0);
682		}
683	}
684
685	delay = options_get_number(&c->session->options, "display-time");
686	tv.tv_sec = delay / 1000;
687	tv.tv_usec = (delay % 1000) * 1000L;
688
689	if (event_initialized(&c->message_timer))
690		evtimer_del(&c->message_timer);
691	evtimer_set(&c->message_timer, status_message_callback, c);
692	evtimer_add(&c->message_timer, &tv);
693
694	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
695	c->flags |= CLIENT_STATUS;
696}
697
698/* Clear status line message. */
699void
700status_message_clear(struct client *c)
701{
702	if (c->message_string == NULL)
703		return;
704
705	free(c->message_string);
706	c->message_string = NULL;
707
708	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
709	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
710
711	screen_reinit(&c->status);
712}
713
714/* Clear status line message after timer expires. */
715void
716status_message_callback(unused int fd, unused short event, void *data)
717{
718	struct client	*c = data;
719
720	status_message_clear(c);
721}
722
723/* Draw client message on status line of present else on last line. */
724int
725status_message_redraw(struct client *c)
726{
727	struct screen_write_ctx		ctx;
728	struct session		       *s = c->session;
729	struct screen		        old_status;
730	size_t			        len;
731	struct grid_cell		gc;
732	int				utf8flag;
733
734	if (c->tty.sx == 0 || c->tty.sy == 0)
735		return (0);
736	memcpy(&old_status, &c->status, sizeof old_status);
737	screen_init(&c->status, c->tty.sx, 1, 0);
738
739	utf8flag = options_get_number(&s->options, "status-utf8");
740
741	len = screen_write_strlen(utf8flag, "%s", c->message_string);
742	if (len > c->tty.sx)
743		len = c->tty.sx;
744
745	style_apply(&gc, &s->options, "message-style");
746
747	screen_write_start(&ctx, NULL, &c->status);
748
749	screen_write_cursormove(&ctx, 0, 0);
750	screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->message_string);
751	for (; len < c->tty.sx; len++)
752		screen_write_putc(&ctx, &gc, ' ');
753
754	screen_write_stop(&ctx);
755
756	if (grid_compare(c->status.grid, old_status.grid) == 0) {
757		screen_free(&old_status);
758		return (0);
759	}
760	screen_free(&old_status);
761	return (1);
762}
763
764/* Enable status line prompt. */
765void
766status_prompt_set(struct client *c, const char *msg, const char *input,
767    int (*callbackfn)(void *, const char *), void (*freefn)(void *),
768    void *data, int flags)
769{
770	int	keys;
771
772	status_message_clear(c);
773	status_prompt_clear(c);
774
775	c->prompt_string = status_replace(c, NULL, msg, time(NULL), 0);
776
777	c->prompt_buffer = status_replace(c, NULL, input, time(NULL), 0);
778	c->prompt_index = strlen(c->prompt_buffer);
779
780	c->prompt_callbackfn = callbackfn;
781	c->prompt_freefn = freefn;
782	c->prompt_data = data;
783
784	c->prompt_hindex = 0;
785
786	c->prompt_flags = flags;
787
788	keys = options_get_number(&c->session->options, "status-keys");
789	if (keys == MODEKEY_EMACS)
790		mode_key_init(&c->prompt_mdata, &mode_key_tree_emacs_edit);
791	else
792		mode_key_init(&c->prompt_mdata, &mode_key_tree_vi_edit);
793
794	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
795	c->flags |= CLIENT_STATUS;
796}
797
798/* Remove status line prompt. */
799void
800status_prompt_clear(struct client *c)
801{
802	if (c->prompt_string == NULL)
803		return;
804
805	if (c->prompt_freefn != NULL && c->prompt_data != NULL)
806		c->prompt_freefn(c->prompt_data);
807
808	free(c->prompt_string);
809	c->prompt_string = NULL;
810
811	free(c->prompt_buffer);
812	c->prompt_buffer = NULL;
813
814	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
815	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
816
817	screen_reinit(&c->status);
818}
819
820/* Update status line prompt with a new prompt string. */
821void
822status_prompt_update(struct client *c, const char *msg, const char *input)
823{
824	free(c->prompt_string);
825	c->prompt_string = status_replace(c, NULL, msg, time(NULL), 0);
826
827	free(c->prompt_buffer);
828	c->prompt_buffer = status_replace(c, NULL, input, time(NULL), 0);
829	c->prompt_index = strlen(c->prompt_buffer);
830
831	c->prompt_hindex = 0;
832
833	c->flags |= CLIENT_STATUS;
834}
835
836/* Draw client prompt on status line of present else on last line. */
837int
838status_prompt_redraw(struct client *c)
839{
840	struct screen_write_ctx		ctx;
841	struct session		       *s = c->session;
842	struct screen		        old_status;
843	size_t			        i, size, left, len, off;
844	struct grid_cell		gc, *gcp;
845	int				utf8flag;
846
847	if (c->tty.sx == 0 || c->tty.sy == 0)
848		return (0);
849	memcpy(&old_status, &c->status, sizeof old_status);
850	screen_init(&c->status, c->tty.sx, 1, 0);
851
852	utf8flag = options_get_number(&s->options, "status-utf8");
853
854	len = screen_write_strlen(utf8flag, "%s", c->prompt_string);
855	if (len > c->tty.sx)
856		len = c->tty.sx;
857	off = 0;
858
859	/* Change colours for command mode. */
860	if (c->prompt_mdata.mode == 1)
861		style_apply(&gc, &s->options, "message-command-style");
862	else
863		style_apply(&gc, &s->options, "message-style");
864
865	screen_write_start(&ctx, NULL, &c->status);
866
867	screen_write_cursormove(&ctx, 0, 0);
868	screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->prompt_string);
869
870	left = c->tty.sx - len;
871	if (left != 0) {
872		size = screen_write_strlen(utf8flag, "%s", c->prompt_buffer);
873		if (c->prompt_index >= left) {
874			off = c->prompt_index - left + 1;
875			if (c->prompt_index == size)
876				left--;
877			size = left;
878		}
879		screen_write_nputs(
880		    &ctx, left, &gc, utf8flag, "%s", c->prompt_buffer + off);
881
882		for (i = len + size; i < c->tty.sx; i++)
883			screen_write_putc(&ctx, &gc, ' ');
884	}
885
886	screen_write_stop(&ctx);
887
888	/* Apply fake cursor. */
889	off = len + c->prompt_index - off;
890	gcp = grid_view_get_cell(c->status.grid, off, 0);
891	gcp->attr ^= GRID_ATTR_REVERSE;
892
893	if (grid_compare(c->status.grid, old_status.grid) == 0) {
894		screen_free(&old_status);
895		return (0);
896	}
897	screen_free(&old_status);
898	return (1);
899}
900
901/* Handle keys in prompt. */
902void
903status_prompt_key(struct client *c, int key)
904{
905	struct session		*sess = c->session;
906	struct options		*oo = &sess->options;
907	struct paste_buffer	*pb;
908	char			*s, *first, *last, word[64], swapc;
909	const char		*histstr;
910	const char		*wsep = NULL;
911	u_char			 ch;
912	size_t			 size, n, off, idx;
913
914	size = strlen(c->prompt_buffer);
915	switch (mode_key_lookup(&c->prompt_mdata, key, NULL)) {
916	case MODEKEYEDIT_CURSORLEFT:
917		if (c->prompt_index > 0) {
918			c->prompt_index--;
919			c->flags |= CLIENT_STATUS;
920		}
921		break;
922	case MODEKEYEDIT_SWITCHMODE:
923		c->flags |= CLIENT_STATUS;
924		break;
925	case MODEKEYEDIT_SWITCHMODEAPPEND:
926		c->flags |= CLIENT_STATUS;
927		/* FALLTHROUGH */
928	case MODEKEYEDIT_CURSORRIGHT:
929		if (c->prompt_index < size) {
930			c->prompt_index++;
931			c->flags |= CLIENT_STATUS;
932		}
933		break;
934	case MODEKEYEDIT_SWITCHMODEBEGINLINE:
935		c->flags |= CLIENT_STATUS;
936		/* FALLTHROUGH */
937	case MODEKEYEDIT_STARTOFLINE:
938		if (c->prompt_index != 0) {
939			c->prompt_index = 0;
940			c->flags |= CLIENT_STATUS;
941		}
942		break;
943	case MODEKEYEDIT_SWITCHMODEAPPENDLINE:
944		c->flags |= CLIENT_STATUS;
945		/* FALLTHROUGH */
946	case MODEKEYEDIT_ENDOFLINE:
947		if (c->prompt_index != size) {
948			c->prompt_index = size;
949			c->flags |= CLIENT_STATUS;
950		}
951		break;
952	case MODEKEYEDIT_COMPLETE:
953		if (*c->prompt_buffer == '\0')
954			break;
955
956		idx = c->prompt_index;
957		if (idx != 0)
958			idx--;
959
960		/* Find the word we are in. */
961		first = c->prompt_buffer + idx;
962		while (first > c->prompt_buffer && *first != ' ')
963			first--;
964		while (*first == ' ')
965			first++;
966		last = c->prompt_buffer + idx;
967		while (*last != '\0' && *last != ' ')
968			last++;
969		while (*last == ' ')
970			last--;
971		if (*last != '\0')
972			last++;
973		if (last <= first ||
974		    ((size_t) (last - first)) > (sizeof word) - 1)
975			break;
976		memcpy(word, first, last - first);
977		word[last - first] = '\0';
978
979		/* And try to complete it. */
980		if ((s = status_prompt_complete(word)) == NULL)
981			break;
982
983		/* Trim out word. */
984		n = size - (last - c->prompt_buffer) + 1; /* with \0 */
985		memmove(first, last, n);
986		size -= last - first;
987
988		/* Insert the new word. */
989		size += strlen(s);
990		off = first - c->prompt_buffer;
991		c->prompt_buffer = xrealloc(c->prompt_buffer, size + 1);
992		first = c->prompt_buffer + off;
993		memmove(first + strlen(s), first, n);
994		memcpy(first, s, strlen(s));
995
996		c->prompt_index = (first - c->prompt_buffer) + strlen(s);
997		free(s);
998
999		c->flags |= CLIENT_STATUS;
1000		break;
1001	case MODEKEYEDIT_BACKSPACE:
1002		if (c->prompt_index != 0) {
1003			if (c->prompt_index == size)
1004				c->prompt_buffer[--c->prompt_index] = '\0';
1005			else {
1006				memmove(c->prompt_buffer + c->prompt_index - 1,
1007				    c->prompt_buffer + c->prompt_index,
1008				    size + 1 - c->prompt_index);
1009				c->prompt_index--;
1010			}
1011			c->flags |= CLIENT_STATUS;
1012		}
1013		break;
1014	case MODEKEYEDIT_DELETE:
1015	case MODEKEYEDIT_SWITCHMODESUBSTITUTE:
1016		if (c->prompt_index != size) {
1017			memmove(c->prompt_buffer + c->prompt_index,
1018			    c->prompt_buffer + c->prompt_index + 1,
1019			    size + 1 - c->prompt_index);
1020			c->flags |= CLIENT_STATUS;
1021		}
1022		break;
1023	case MODEKEYEDIT_DELETELINE:
1024	case MODEKEYEDIT_SWITCHMODESUBSTITUTELINE:
1025		*c->prompt_buffer = '\0';
1026		c->prompt_index = 0;
1027		c->flags |= CLIENT_STATUS;
1028		break;
1029	case MODEKEYEDIT_DELETETOENDOFLINE:
1030	case MODEKEYEDIT_SWITCHMODECHANGELINE:
1031		if (c->prompt_index < size) {
1032			c->prompt_buffer[c->prompt_index] = '\0';
1033			c->flags |= CLIENT_STATUS;
1034		}
1035		break;
1036	case MODEKEYEDIT_DELETEWORD:
1037		wsep = options_get_string(oo, "word-separators");
1038		idx = c->prompt_index;
1039
1040		/* Find a non-separator. */
1041		while (idx != 0) {
1042			idx--;
1043			if (!strchr(wsep, c->prompt_buffer[idx]))
1044				break;
1045		}
1046
1047		/* Find the separator at the beginning of the word. */
1048		while (idx != 0) {
1049			idx--;
1050			if (strchr(wsep, c->prompt_buffer[idx])) {
1051				/* Go back to the word. */
1052				idx++;
1053				break;
1054			}
1055		}
1056
1057		memmove(c->prompt_buffer + idx,
1058		    c->prompt_buffer + c->prompt_index,
1059		    size + 1 - c->prompt_index);
1060		memset(c->prompt_buffer + size - (c->prompt_index - idx),
1061		    '\0', c->prompt_index - idx);
1062		c->prompt_index = idx;
1063		c->flags |= CLIENT_STATUS;
1064		break;
1065	case MODEKEYEDIT_NEXTSPACE:
1066		wsep = " ";
1067		/* FALLTHROUGH */
1068	case MODEKEYEDIT_NEXTWORD:
1069		if (wsep == NULL)
1070			wsep = options_get_string(oo, "word-separators");
1071
1072		/* Find a separator. */
1073		while (c->prompt_index != size) {
1074			c->prompt_index++;
1075			if (strchr(wsep, c->prompt_buffer[c->prompt_index]))
1076				break;
1077		}
1078
1079		/* Find the word right after the separation. */
1080		while (c->prompt_index != size) {
1081			c->prompt_index++;
1082			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1083				break;
1084		}
1085
1086		c->flags |= CLIENT_STATUS;
1087		break;
1088	case MODEKEYEDIT_NEXTSPACEEND:
1089		wsep = " ";
1090		/* FALLTHROUGH */
1091	case MODEKEYEDIT_NEXTWORDEND:
1092		if (wsep == NULL)
1093			wsep = options_get_string(oo, "word-separators");
1094
1095		/* Find a word. */
1096		while (c->prompt_index != size) {
1097			c->prompt_index++;
1098			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1099				break;
1100		}
1101
1102		/* Find the separator at the end of the word. */
1103		while (c->prompt_index != size) {
1104			c->prompt_index++;
1105			if (strchr(wsep, c->prompt_buffer[c->prompt_index]))
1106				break;
1107		}
1108
1109		/* Back up to the end-of-word like vi. */
1110		if (options_get_number(oo, "status-keys") == MODEKEY_VI &&
1111		    c->prompt_index != 0)
1112			c->prompt_index--;
1113
1114		c->flags |= CLIENT_STATUS;
1115		break;
1116	case MODEKEYEDIT_PREVIOUSSPACE:
1117		wsep = " ";
1118		/* FALLTHROUGH */
1119	case MODEKEYEDIT_PREVIOUSWORD:
1120		if (wsep == NULL)
1121			wsep = options_get_string(oo, "word-separators");
1122
1123		/* Find a non-separator. */
1124		while (c->prompt_index != 0) {
1125			c->prompt_index--;
1126			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1127				break;
1128		}
1129
1130		/* Find the separator at the beginning of the word. */
1131		while (c->prompt_index != 0) {
1132			c->prompt_index--;
1133			if (strchr(wsep, c->prompt_buffer[c->prompt_index])) {
1134				/* Go back to the word. */
1135				c->prompt_index++;
1136				break;
1137			}
1138		}
1139
1140		c->flags |= CLIENT_STATUS;
1141		break;
1142	case MODEKEYEDIT_HISTORYUP:
1143		histstr = status_prompt_up_history(&c->prompt_hindex);
1144		if (histstr == NULL)
1145			break;
1146		free(c->prompt_buffer);
1147		c->prompt_buffer = xstrdup(histstr);
1148		c->prompt_index = strlen(c->prompt_buffer);
1149		c->flags |= CLIENT_STATUS;
1150		break;
1151	case MODEKEYEDIT_HISTORYDOWN:
1152		histstr = status_prompt_down_history(&c->prompt_hindex);
1153		if (histstr == NULL)
1154			break;
1155		free(c->prompt_buffer);
1156		c->prompt_buffer = xstrdup(histstr);
1157		c->prompt_index = strlen(c->prompt_buffer);
1158		c->flags |= CLIENT_STATUS;
1159		break;
1160	case MODEKEYEDIT_PASTE:
1161		if ((pb = paste_get_top()) == NULL)
1162			break;
1163		for (n = 0; n < pb->size; n++) {
1164			ch = (u_char) pb->data[n];
1165			if (ch < 32 || ch == 127)
1166				break;
1167		}
1168
1169		c->prompt_buffer = xrealloc(c->prompt_buffer, size + n + 1);
1170		if (c->prompt_index == size) {
1171			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
1172			c->prompt_index += n;
1173			c->prompt_buffer[c->prompt_index] = '\0';
1174		} else {
1175			memmove(c->prompt_buffer + c->prompt_index + n,
1176			    c->prompt_buffer + c->prompt_index,
1177			    size + 1 - c->prompt_index);
1178			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
1179			c->prompt_index += n;
1180		}
1181
1182		c->flags |= CLIENT_STATUS;
1183		break;
1184	case MODEKEYEDIT_TRANSPOSECHARS:
1185		idx = c->prompt_index;
1186		if (idx < size)
1187			idx++;
1188		if (idx >= 2) {
1189			swapc = c->prompt_buffer[idx - 2];
1190			c->prompt_buffer[idx - 2] = c->prompt_buffer[idx - 1];
1191			c->prompt_buffer[idx - 1] = swapc;
1192			c->prompt_index = idx;
1193			c->flags |= CLIENT_STATUS;
1194		}
1195		break;
1196	case MODEKEYEDIT_ENTER:
1197		if (*c->prompt_buffer != '\0')
1198			status_prompt_add_history(c->prompt_buffer);
1199		if (c->prompt_callbackfn(c->prompt_data, c->prompt_buffer) == 0)
1200			status_prompt_clear(c);
1201		break;
1202	case MODEKEYEDIT_CANCEL:
1203		if (c->prompt_callbackfn(c->prompt_data, NULL) == 0)
1204			status_prompt_clear(c);
1205		break;
1206	case MODEKEY_OTHER:
1207		if ((key & 0xff00) != 0 || key < 32 || key == 127)
1208			break;
1209		c->prompt_buffer = xrealloc(c->prompt_buffer, size + 2);
1210
1211		if (c->prompt_index == size) {
1212			c->prompt_buffer[c->prompt_index++] = key;
1213			c->prompt_buffer[c->prompt_index] = '\0';
1214		} else {
1215			memmove(c->prompt_buffer + c->prompt_index + 1,
1216			    c->prompt_buffer + c->prompt_index,
1217			    size + 1 - c->prompt_index);
1218			c->prompt_buffer[c->prompt_index++] = key;
1219		}
1220
1221		if (c->prompt_flags & PROMPT_SINGLE) {
1222			if (c->prompt_callbackfn(
1223			    c->prompt_data, c->prompt_buffer) == 0)
1224				status_prompt_clear(c);
1225		}
1226
1227		c->flags |= CLIENT_STATUS;
1228		break;
1229	default:
1230		break;
1231	}
1232}
1233
1234/* Get previous line from the history. */
1235const char *
1236status_prompt_up_history(u_int *idx)
1237{
1238	u_int size;
1239
1240	/*
1241	 * History runs from 0 to size - 1.
1242	 *
1243	 * Index is from 0 to size. Zero is empty.
1244	 */
1245
1246	size = ARRAY_LENGTH(&status_prompt_history);
1247	if (size == 0 || *idx == size)
1248		return (NULL);
1249	(*idx)++;
1250	return (ARRAY_ITEM(&status_prompt_history, size - *idx));
1251}
1252
1253/* Get next line from the history. */
1254const char *
1255status_prompt_down_history(u_int *idx)
1256{
1257	u_int size;
1258
1259	size = ARRAY_LENGTH(&status_prompt_history);
1260	if (size == 0 || *idx == 0)
1261		return ("");
1262	(*idx)--;
1263	if (*idx == 0)
1264		return ("");
1265	return (ARRAY_ITEM(&status_prompt_history, size - *idx));
1266}
1267
1268/* Add line to the history. */
1269void
1270status_prompt_add_history(const char *line)
1271{
1272	u_int size;
1273
1274	size = ARRAY_LENGTH(&status_prompt_history);
1275	if (size > 0 && strcmp(ARRAY_LAST(&status_prompt_history), line) == 0)
1276		return;
1277
1278	if (size == PROMPT_HISTORY) {
1279		free(ARRAY_FIRST(&status_prompt_history));
1280		ARRAY_REMOVE(&status_prompt_history, 0);
1281	}
1282
1283	ARRAY_ADD(&status_prompt_history, xstrdup(line));
1284}
1285
1286/* Complete word. */
1287char *
1288status_prompt_complete(const char *s)
1289{
1290	const struct cmd_entry 	  	       **cmdent;
1291	const struct options_table_entry	*oe;
1292	ARRAY_DECL(, const char *)		 list;
1293	char					*prefix, *s2;
1294	u_int					 i;
1295	size_t				 	 j;
1296
1297	if (*s == '\0')
1298		return (NULL);
1299
1300	/* First, build a list of all the possible matches. */
1301	ARRAY_INIT(&list);
1302	for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
1303		if (strncmp((*cmdent)->name, s, strlen(s)) == 0)
1304			ARRAY_ADD(&list, (*cmdent)->name);
1305	}
1306	for (oe = server_options_table; oe->name != NULL; oe++) {
1307		if (strncmp(oe->name, s, strlen(s)) == 0)
1308			ARRAY_ADD(&list, oe->name);
1309	}
1310	for (oe = session_options_table; oe->name != NULL; oe++) {
1311		if (strncmp(oe->name, s, strlen(s)) == 0)
1312			ARRAY_ADD(&list, oe->name);
1313	}
1314	for (oe = window_options_table; oe->name != NULL; oe++) {
1315		if (strncmp(oe->name, s, strlen(s)) == 0)
1316			ARRAY_ADD(&list, oe->name);
1317	}
1318
1319	/* If none, bail now. */
1320	if (ARRAY_LENGTH(&list) == 0) {
1321		ARRAY_FREE(&list);
1322		return (NULL);
1323	}
1324
1325	/* If an exact match, return it, with a trailing space. */
1326	if (ARRAY_LENGTH(&list) == 1) {
1327		xasprintf(&s2, "%s ", ARRAY_FIRST(&list));
1328		ARRAY_FREE(&list);
1329		return (s2);
1330	}
1331
1332	/* Now loop through the list and find the longest common prefix. */
1333	prefix = xstrdup(ARRAY_FIRST(&list));
1334	for (i = 1; i < ARRAY_LENGTH(&list); i++) {
1335		s = ARRAY_ITEM(&list, i);
1336
1337		j = strlen(s);
1338		if (j > strlen(prefix))
1339			j = strlen(prefix);
1340		for (; j > 0; j--) {
1341			if (prefix[j - 1] != s[j - 1])
1342				prefix[j - 1] = '\0';
1343		}
1344	}
1345
1346	ARRAY_FREE(&list);
1347	return (prefix);
1348}
1349