status.c revision 1.112 
1/* $OpenBSD: status.c,v 1.112 2014/04/02 17:08:23 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,
79    time_t t, int utf8flag, struct grid_cell *gc, size_t *size)
80{
81	struct session	*s = c->session;
82	char		*left;
83	size_t		 leftlen;
84
85	style_apply_update(gc, &s->options, "status-left-style");
86
87	left = status_replace(c, NULL,
88	    NULL, NULL, options_get_string(&s->options, "status-left"), t, 1);
89
90	*size = options_get_number(&s->options, "status-left-length");
91	leftlen = screen_write_cstrlen(utf8flag, "%s", left);
92	if (leftlen < *size)
93		*size = leftlen;
94	return (left);
95}
96
97/* Retrieve options for right string. */
98char *
99status_redraw_get_right(struct client *c,
100    time_t t, int utf8flag, struct grid_cell *gc, size_t *size)
101{
102	struct session	*s = c->session;
103	char		*right;
104	size_t		 rightlen;
105
106	style_apply_update(gc, &s->options, "status-right-style");
107
108	right = status_replace(c, NULL,
109	    NULL, NULL, options_get_string(&s->options, "status-right"), t, 1);
110
111	*size = options_get_number(&s->options, "status-right-length");
112	rightlen = screen_write_cstrlen(utf8flag, "%s", right);
113	if (rightlen < *size)
114		*size = rightlen;
115	return (right);
116}
117
118/* Set window at window list position. */
119void
120status_set_window_at(struct client *c, u_int x)
121{
122	struct session	*s = c->session;
123	struct winlink	*wl;
124
125	x += c->wlmouse;
126	RB_FOREACH(wl, winlinks, &s->windows) {
127		if (x < wl->status_width && session_select(s, wl->idx) == 0)
128			server_redraw_session(s);
129		x -= wl->status_width + 1;
130	}
131}
132
133/* Draw status for client on the last lines of given context. */
134int
135status_redraw(struct client *c)
136{
137	struct screen_write_ctx	ctx;
138	struct session	       *s = c->session;
139	struct winlink	       *wl;
140	struct screen		old_status, window_list;
141	struct grid_cell	stdgc, lgc, rgc, gc;
142	struct options	       *oo;
143	time_t			t;
144	char		       *left, *right, *sep;
145	u_int			offset, needed;
146	u_int			wlstart, wlwidth, wlavailable, wloffset, wlsize;
147	size_t			llen, rlen, seplen;
148	int			larrow, rarrow, utf8flag;
149
150	/* No status line? */
151	if (c->tty.sy == 0 || !options_get_number(&s->options, "status"))
152		return (1);
153	left = right = NULL;
154	larrow = rarrow = 0;
155
156	/* Update status timer. */
157	if (gettimeofday(&c->status_timer, NULL) != 0)
158		fatal("gettimeofday failed");
159	t = c->status_timer.tv_sec;
160
161	/* Set up default colour. */
162	style_apply(&stdgc, &s->options, "status-style");
163
164	/* Create the target screen. */
165	memcpy(&old_status, &c->status, sizeof old_status);
166	screen_init(&c->status, c->tty.sx, 1, 0);
167	screen_write_start(&ctx, NULL, &c->status);
168	for (offset = 0; offset < c->tty.sx; offset++)
169		screen_write_putc(&ctx, &stdgc, ' ');
170	screen_write_stop(&ctx);
171
172	/* If the height is one line, blank status line. */
173	if (c->tty.sy <= 1)
174		goto out;
175
176	/* Get UTF-8 flag. */
177	utf8flag = options_get_number(&s->options, "status-utf8");
178
179	/* Work out left and right strings. */
180	memcpy(&lgc, &stdgc, sizeof lgc);
181	left = status_redraw_get_left(c, t, utf8flag, &lgc, &llen);
182	memcpy(&rgc, &stdgc, sizeof rgc);
183	right = status_redraw_get_right(c, t, utf8flag, &rgc, &rlen);
184
185	/*
186	 * Figure out how much space we have for the window list. If there
187	 * isn't enough space, just show a blank status line.
188	 */
189	needed = 0;
190	if (llen != 0)
191		needed += llen + 1;
192	if (rlen != 0)
193		needed += rlen + 1;
194	if (c->tty.sx == 0 || c->tty.sx <= needed)
195		goto out;
196	wlavailable = c->tty.sx - needed;
197
198	/* Calculate the total size needed for the window list. */
199	wlstart = wloffset = wlwidth = 0;
200	RB_FOREACH(wl, winlinks, &s->windows) {
201		free(wl->status_text);
202		memcpy(&wl->status_cell, &stdgc, sizeof wl->status_cell);
203		wl->status_text = status_print(c, wl, t, &wl->status_cell);
204		wl->status_width =
205		    screen_write_cstrlen(utf8flag, "%s", wl->status_text);
206
207		if (wl == s->curw)
208			wloffset = wlwidth;
209
210		oo = &wl->window->options;
211		sep = options_get_string(oo, "window-status-separator");
212		seplen = screen_write_strlen(utf8flag, "%s", sep);
213		wlwidth += wl->status_width + seplen;
214	}
215
216	/* Create a new screen for the window list. */
217	screen_init(&window_list, wlwidth, 1, 0);
218
219	/* And draw the window list into it. */
220	screen_write_start(&ctx, NULL, &window_list);
221	RB_FOREACH(wl, winlinks, &s->windows) {
222		screen_write_cnputs(&ctx,
223		    -1, &wl->status_cell, utf8flag, "%s", wl->status_text);
224
225		oo = &wl->window->options;
226		sep = options_get_string(oo, "window-status-separator");
227		screen_write_nputs(&ctx, -1, &stdgc, utf8flag, "%s", sep);
228	}
229	screen_write_stop(&ctx);
230
231	/* If there is enough space for the total width, skip to draw now. */
232	if (wlwidth <= wlavailable)
233		goto draw;
234
235	/* Find size of current window text. */
236	wlsize = s->curw->status_width;
237
238	/*
239	 * If the current window is already on screen, good to draw from the
240	 * start and just leave off the end.
241	 */
242	if (wloffset + wlsize < wlavailable) {
243		if (wlavailable > 0) {
244			rarrow = 1;
245			wlavailable--;
246		}
247		wlwidth = wlavailable;
248	} else {
249		/*
250		 * Work out how many characters we need to omit from the
251		 * start. There are wlavailable characters to fill, and
252		 * wloffset + wlsize must be the last. So, the start character
253		 * is wloffset + wlsize - wlavailable.
254		 */
255		if (wlavailable > 0) {
256			larrow = 1;
257			wlavailable--;
258		}
259
260		wlstart = wloffset + wlsize - wlavailable;
261		if (wlavailable > 0 && wlwidth > wlstart + wlavailable + 1) {
262			rarrow = 1;
263			wlstart++;
264			wlavailable--;
265		}
266		wlwidth = wlavailable;
267	}
268
269	/* Bail if anything is now too small too. */
270	if (wlwidth == 0 || wlavailable == 0) {
271		screen_free(&window_list);
272		goto out;
273	}
274
275	/*
276	 * Now the start position is known, work out the state of the left and
277	 * right arrows.
278	 */
279	offset = 0;
280	RB_FOREACH(wl, winlinks, &s->windows) {
281		if (wl->flags & WINLINK_ALERTFLAGS &&
282		    larrow == 1 && offset < wlstart)
283			larrow = -1;
284
285		offset += wl->status_width;
286
287		if (wl->flags & WINLINK_ALERTFLAGS &&
288		    rarrow == 1 && offset > wlstart + wlwidth)
289			rarrow = -1;
290	}
291
292draw:
293	/* Begin drawing. */
294	screen_write_start(&ctx, NULL, &c->status);
295
296	/* Draw the left string and arrow. */
297	screen_write_cursormove(&ctx, 0, 0);
298	if (llen != 0) {
299		screen_write_cnputs(&ctx, llen, &lgc, utf8flag, "%s", left);
300		screen_write_putc(&ctx, &stdgc, ' ');
301	}
302	if (larrow != 0) {
303		memcpy(&gc, &stdgc, sizeof gc);
304		if (larrow == -1)
305			gc.attr ^= GRID_ATTR_REVERSE;
306		screen_write_putc(&ctx, &gc, '<');
307	}
308
309	/* Draw the right string and arrow. */
310	if (rarrow != 0) {
311		screen_write_cursormove(&ctx, c->tty.sx - rlen - 2, 0);
312		memcpy(&gc, &stdgc, sizeof gc);
313		if (rarrow == -1)
314			gc.attr ^= GRID_ATTR_REVERSE;
315		screen_write_putc(&ctx, &gc, '>');
316	} else
317		screen_write_cursormove(&ctx, c->tty.sx - rlen - 1, 0);
318	if (rlen != 0) {
319		screen_write_putc(&ctx, &stdgc, ' ');
320		screen_write_cnputs(&ctx, rlen, &rgc, utf8flag, "%s", right);
321	}
322
323	/* Figure out the offset for the window list. */
324	if (llen != 0)
325		wloffset = llen + 1;
326	else
327		wloffset = 0;
328	if (wlwidth < wlavailable) {
329		switch (options_get_number(&s->options, "status-justify")) {
330		case 1:	/* centered */
331			wloffset += (wlavailable - wlwidth) / 2;
332			break;
333		case 2:	/* right */
334			wloffset += (wlavailable - wlwidth);
335			break;
336		}
337	}
338	if (larrow != 0)
339		wloffset++;
340
341	/* Copy the window list. */
342	c->wlmouse = -wloffset + wlstart;
343	screen_write_cursormove(&ctx, wloffset, 0);
344	screen_write_copy(&ctx, &window_list, wlstart, 0, wlwidth, 1);
345	screen_free(&window_list);
346
347	screen_write_stop(&ctx);
348
349out:
350	free(left);
351	free(right);
352
353	if (grid_compare(c->status.grid, old_status.grid) == 0) {
354		screen_free(&old_status);
355		return (0);
356	}
357	screen_free(&old_status);
358	return (1);
359}
360
361/* Replace a single special sequence (prefixed by #). */
362void
363status_replace1(struct client *c, char **iptr, char **optr, char *out,
364    size_t outsize, int jobsflag)
365{
366	char	ch, tmp[256], *ptr, *endptr;
367	size_t	ptrlen;
368	long	limit;
369
370	errno = 0;
371	limit = strtol(*iptr, &endptr, 10);
372	if ((limit == 0 && errno != EINVAL) ||
373	    (limit == LONG_MIN && errno != ERANGE) ||
374	    (limit == LONG_MAX && errno != ERANGE) ||
375	    limit != 0)
376		*iptr = endptr;
377	if (limit <= 0)
378		limit = LONG_MAX;
379
380	switch (*(*iptr)++) {
381	case '(':
382		if (!jobsflag) {
383			ch = ')';
384			goto skip_to;
385		}
386		if ((ptr = status_find_job(c, iptr)) == NULL)
387			return;
388		goto do_replace;
389	case '[':
390		/*
391		 * Embedded style, handled at display time. Leave present and
392		 * skip input until ].
393		 */
394		ch = ']';
395		goto skip_to;
396	case '{':
397		ptr = (char *) "#{";
398		goto do_replace;
399	default:
400		xsnprintf(tmp, sizeof tmp, "#%c", *(*iptr - 1));
401		ptr = tmp;
402		goto do_replace;
403	}
404
405	return;
406
407do_replace:
408	ptrlen = strlen(ptr);
409	if ((size_t) limit < ptrlen)
410		ptrlen = limit;
411
412	if (*optr + ptrlen >= out + outsize - 1)
413		return;
414	while (ptrlen > 0 && *ptr != '\0') {
415		*(*optr)++ = *ptr++;
416		ptrlen--;
417	}
418
419	return;
420
421skip_to:
422	*(*optr)++ = '#';
423
424	(*iptr)--;	/* include ch */
425	while (**iptr != ch && **iptr != '\0') {
426		if (*optr >=  out + outsize - 1)
427			break;
428		*(*optr)++ = *(*iptr)++;
429	}
430}
431
432/* Replace special sequences in fmt. */
433char *
434status_replace(struct client *c, struct session *s, struct winlink *wl,
435    struct window_pane *wp, const char *fmt, time_t t, int jobsflag)
436{
437	static char		 out[BUFSIZ];
438	char			 in[BUFSIZ], ch, *iptr, *optr, *expanded;
439	size_t			 len;
440	struct format_tree	*ft;
441
442	if (fmt == NULL)
443		return (xstrdup(""));
444
445	if (s == NULL && c != NULL)
446		s = c->session;
447	if (wl == NULL && s != NULL)
448		wl = s->curw;
449	if (wp == NULL && wl != NULL)
450		wp = wl->window->active;
451
452	len = strftime(in, sizeof in, fmt, localtime(&t));
453	in[len] = '\0';
454
455	iptr = in;
456	optr = out;
457
458	while (*iptr != '\0') {
459		if (optr >= out + (sizeof out) - 1)
460			break;
461		ch = *iptr++;
462
463		if (ch != '#' || *iptr == '\0') {
464			*optr++ = ch;
465			continue;
466		}
467		status_replace1(c, &iptr, &optr, out, sizeof out, jobsflag);
468	}
469	*optr = '\0';
470
471	ft = format_create();
472	if (c != NULL)
473		format_client(ft, c);
474	if (s != NULL)
475		format_session(ft, s);
476	if (s != NULL && wl != NULL)
477		format_winlink(ft, s, wl);
478	if (wp != NULL)
479		format_window_pane(ft, wp);
480	expanded = format_expand(ft, out);
481	format_free(ft);
482	return (expanded);
483}
484
485/* Figure out job name and get its result, starting it off if necessary. */
486char *
487status_find_job(struct client *c, char **iptr)
488{
489	struct status_out	*so, so_find;
490	char   			*cmd;
491	int			 lastesc;
492	size_t			 len;
493
494	if (**iptr == '\0')
495		return (NULL);
496	if (**iptr == ')') {		/* no command given */
497		(*iptr)++;
498		return (NULL);
499	}
500
501	cmd = xmalloc(strlen(*iptr) + 1);
502	len = 0;
503
504	lastesc = 0;
505	for (; **iptr != '\0'; (*iptr)++) {
506		if (!lastesc && **iptr == ')')
507			break;		/* unescaped ) is the end */
508		if (!lastesc && **iptr == '\\') {
509			lastesc = 1;
510			continue;	/* skip \ if not escaped */
511		}
512		lastesc = 0;
513		cmd[len++] = **iptr;
514	}
515	if (**iptr == '\0')		/* no terminating ) */ {
516		free(cmd);
517		return (NULL);
518	}
519	(*iptr)++;			/* skip final ) */
520	cmd[len] = '\0';
521
522	/* First try in the new tree. */
523	so_find.cmd = cmd;
524	so = RB_FIND(status_out_tree, &c->status_new, &so_find);
525	if (so != NULL && so->out != NULL) {
526		free(cmd);
527		return (so->out);
528	}
529
530	/* If not found at all, start the job and add to the tree. */
531	if (so == NULL) {
532		job_run(cmd, NULL, status_job_callback, status_job_free, c);
533		c->references++;
534
535		so = xmalloc(sizeof *so);
536		so->cmd = xstrdup(cmd);
537		so->out = NULL;
538		RB_INSERT(status_out_tree, &c->status_new, so);
539	}
540
541	/* Lookup in the old tree. */
542	so_find.cmd = cmd;
543	so = RB_FIND(status_out_tree, &c->status_old, &so_find);
544	free(cmd);
545	if (so != NULL)
546		return (so->out);
547	return (NULL);
548}
549
550/* Free job tree. */
551void
552status_free_jobs(struct status_out_tree *sotree)
553{
554	struct status_out	*so, *so_next;
555
556	so_next = RB_MIN(status_out_tree, sotree);
557	while (so_next != NULL) {
558		so = so_next;
559		so_next = RB_NEXT(status_out_tree, sotree, so);
560
561		RB_REMOVE(status_out_tree, sotree, so);
562		free(so->out);
563		free(so->cmd);
564		free(so);
565	}
566}
567
568/* Update jobs on status interval. */
569void
570status_update_jobs(struct client *c)
571{
572	/* Free the old tree. */
573	status_free_jobs(&c->status_old);
574
575	/* Move the new to old. */
576	memcpy(&c->status_old, &c->status_new, sizeof c->status_old);
577	RB_INIT(&c->status_new);
578}
579
580/* Free status job. */
581void
582status_job_free(void *data)
583{
584	struct client	*c = data;
585
586	c->references--;
587}
588
589/* Job has finished: save its result. */
590void
591status_job_callback(struct job *job)
592{
593	struct client		*c = job->data;
594	struct status_out	*so, so_find;
595	char			*line, *buf;
596	size_t			 len;
597
598	if (c->flags & CLIENT_DEAD)
599		return;
600
601	so_find.cmd = job->cmd;
602	so = RB_FIND(status_out_tree, &c->status_new, &so_find);
603	if (so == NULL || so->out != NULL)
604		return;
605
606	buf = NULL;
607	if ((line = evbuffer_readline(job->event->input)) == NULL) {
608		len = EVBUFFER_LENGTH(job->event->input);
609		buf = xmalloc(len + 1);
610		if (len != 0)
611			memcpy(buf, EVBUFFER_DATA(job->event->input), len);
612		buf[len] = '\0';
613	} else
614		buf = line;
615
616	so->out = buf;
617	server_status_client(c);
618}
619
620/* Return winlink status line entry and adjust gc as necessary. */
621char *
622status_print(
623    struct client *c, struct winlink *wl, time_t t, struct grid_cell *gc)
624{
625	struct options	*oo = &wl->window->options;
626	struct session	*s = c->session;
627	const char	*fmt;
628	char   		*text;
629
630	style_apply_update(gc, oo, "window-status-style");
631	fmt = options_get_string(oo, "window-status-format");
632	if (wl == s->curw) {
633		style_apply_update(gc, oo, "window-status-current-style");
634		fmt = options_get_string(oo, "window-status-current-format");
635	}
636	if (wl == TAILQ_FIRST(&s->lastw))
637		style_apply_update(gc, oo, "window-status-last-style");
638
639	if (wl->flags & WINLINK_BELL)
640		style_apply_update(gc, oo, "window-status-bell-style");
641	else if (wl->flags & WINLINK_CONTENT)
642		style_apply_update(gc, oo, "window-status-content-style");
643	else if (wl->flags & (WINLINK_ACTIVITY|WINLINK_SILENCE))
644		style_apply_update(gc, oo, "window-status-activity-style");
645
646	text = status_replace(c, NULL, wl, NULL, fmt, t, 1);
647	return (text);
648}
649
650/* Set a status line message. */
651void printflike2
652status_message_set(struct client *c, const char *fmt, ...)
653{
654	struct timeval		 tv;
655	struct message_entry	*msg;
656	va_list			 ap;
657	int			 delay;
658	u_int			 i, limit;
659
660	status_prompt_clear(c);
661	status_message_clear(c);
662
663	va_start(ap, fmt);
664	xvasprintf(&c->message_string, fmt, ap);
665	va_end(ap);
666
667	ARRAY_EXPAND(&c->message_log, 1);
668	msg = &ARRAY_LAST(&c->message_log);
669	msg->msg_time = time(NULL);
670	msg->msg = xstrdup(c->message_string);
671
672	limit = options_get_number(&global_options, "message-limit");
673	if (ARRAY_LENGTH(&c->message_log) > limit) {
674		limit = ARRAY_LENGTH(&c->message_log) - limit;
675		for (i = 0; i < limit; i++) {
676			msg = &ARRAY_FIRST(&c->message_log);
677			free(msg->msg);
678			ARRAY_REMOVE(&c->message_log, 0);
679		}
680	}
681
682	delay = options_get_number(&c->session->options, "display-time");
683	tv.tv_sec = delay / 1000;
684	tv.tv_usec = (delay % 1000) * 1000L;
685
686	if (event_initialized(&c->message_timer))
687		evtimer_del(&c->message_timer);
688	evtimer_set(&c->message_timer, status_message_callback, c);
689	evtimer_add(&c->message_timer, &tv);
690
691	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
692	c->flags |= CLIENT_STATUS;
693}
694
695/* Clear status line message. */
696void
697status_message_clear(struct client *c)
698{
699	if (c->message_string == NULL)
700		return;
701
702	free(c->message_string);
703	c->message_string = NULL;
704
705	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
706	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
707
708	screen_reinit(&c->status);
709}
710
711/* Clear status line message after timer expires. */
712void
713status_message_callback(unused int fd, unused short event, void *data)
714{
715	struct client	*c = data;
716
717	status_message_clear(c);
718}
719
720/* Draw client message on status line of present else on last line. */
721int
722status_message_redraw(struct client *c)
723{
724	struct screen_write_ctx		ctx;
725	struct session		       *s = c->session;
726	struct screen		        old_status;
727	size_t			        len;
728	struct grid_cell		gc;
729	int				utf8flag;
730
731	if (c->tty.sx == 0 || c->tty.sy == 0)
732		return (0);
733	memcpy(&old_status, &c->status, sizeof old_status);
734	screen_init(&c->status, c->tty.sx, 1, 0);
735
736	utf8flag = options_get_number(&s->options, "status-utf8");
737
738	len = screen_write_strlen(utf8flag, "%s", c->message_string);
739	if (len > c->tty.sx)
740		len = c->tty.sx;
741
742	style_apply(&gc, &s->options, "message-style");
743
744	screen_write_start(&ctx, NULL, &c->status);
745
746	screen_write_cursormove(&ctx, 0, 0);
747	screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->message_string);
748	for (; len < c->tty.sx; len++)
749		screen_write_putc(&ctx, &gc, ' ');
750
751	screen_write_stop(&ctx);
752
753	if (grid_compare(c->status.grid, old_status.grid) == 0) {
754		screen_free(&old_status);
755		return (0);
756	}
757	screen_free(&old_status);
758	return (1);
759}
760
761/* Enable status line prompt. */
762void
763status_prompt_set(struct client *c, const char *msg, const char *input,
764    int (*callbackfn)(void *, const char *), void (*freefn)(void *),
765    void *data, int flags)
766{
767	int	keys;
768
769	status_message_clear(c);
770	status_prompt_clear(c);
771
772	c->prompt_string = status_replace(c, NULL, NULL, NULL, msg,
773	    time(NULL), 0);
774
775	c->prompt_buffer = status_replace(c, NULL, NULL, NULL, input,
776	    time(NULL), 0);
777	c->prompt_index = strlen(c->prompt_buffer);
778
779	c->prompt_callbackfn = callbackfn;
780	c->prompt_freefn = freefn;
781	c->prompt_data = data;
782
783	c->prompt_hindex = 0;
784
785	c->prompt_flags = flags;
786
787	keys = options_get_number(&c->session->options, "status-keys");
788	if (keys == MODEKEY_EMACS)
789		mode_key_init(&c->prompt_mdata, &mode_key_tree_emacs_edit);
790	else
791		mode_key_init(&c->prompt_mdata, &mode_key_tree_vi_edit);
792
793	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
794	c->flags |= CLIENT_STATUS;
795}
796
797/* Remove status line prompt. */
798void
799status_prompt_clear(struct client *c)
800{
801	if (c->prompt_string == NULL)
802		return;
803
804	if (c->prompt_freefn != NULL && c->prompt_data != NULL)
805		c->prompt_freefn(c->prompt_data);
806
807	free(c->prompt_string);
808	c->prompt_string = NULL;
809
810	free(c->prompt_buffer);
811	c->prompt_buffer = NULL;
812
813	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
814	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */
815
816	screen_reinit(&c->status);
817}
818
819/* Update status line prompt with a new prompt string. */
820void
821status_prompt_update(struct client *c, const char *msg, const char *input)
822{
823	free(c->prompt_string);
824	c->prompt_string = status_replace(c, NULL, NULL, NULL, msg,
825	    time(NULL), 0);
826
827	free(c->prompt_buffer);
828	c->prompt_buffer = status_replace(c, NULL, NULL, NULL, input,
829	    time(NULL), 0);
830	c->prompt_index = strlen(c->prompt_buffer);
831
832	c->prompt_hindex = 0;
833
834	c->flags |= CLIENT_STATUS;
835}
836
837/* Draw client prompt on status line of present else on last line. */
838int
839status_prompt_redraw(struct client *c)
840{
841	struct screen_write_ctx		ctx;
842	struct session		       *s = c->session;
843	struct screen		        old_status;
844	size_t			        i, size, left, len, off;
845	struct grid_cell		gc, *gcp;
846	int				utf8flag;
847
848	if (c->tty.sx == 0 || c->tty.sy == 0)
849		return (0);
850	memcpy(&old_status, &c->status, sizeof old_status);
851	screen_init(&c->status, c->tty.sx, 1, 0);
852
853	utf8flag = options_get_number(&s->options, "status-utf8");
854
855	len = screen_write_strlen(utf8flag, "%s", c->prompt_string);
856	if (len > c->tty.sx)
857		len = c->tty.sx;
858	off = 0;
859
860	/* Change colours for command mode. */
861	if (c->prompt_mdata.mode == 1)
862		style_apply(&gc, &s->options, "message-command-style");
863	else
864		style_apply(&gc, &s->options, "message-style");
865
866	screen_write_start(&ctx, NULL, &c->status);
867
868	screen_write_cursormove(&ctx, 0, 0);
869	screen_write_nputs(&ctx, len, &gc, utf8flag, "%s", c->prompt_string);
870
871	left = c->tty.sx - len;
872	if (left != 0) {
873		size = screen_write_strlen(utf8flag, "%s", c->prompt_buffer);
874		if (c->prompt_index >= left) {
875			off = c->prompt_index - left + 1;
876			if (c->prompt_index == size)
877				left--;
878			size = left;
879		}
880		screen_write_nputs(
881		    &ctx, left, &gc, utf8flag, "%s", c->prompt_buffer + off);
882
883		for (i = len + size; i < c->tty.sx; i++)
884			screen_write_putc(&ctx, &gc, ' ');
885	}
886
887	screen_write_stop(&ctx);
888
889	/* Apply fake cursor. */
890	off = len + c->prompt_index - off;
891	gcp = grid_view_get_cell(c->status.grid, off, 0);
892	gcp->attr ^= GRID_ATTR_REVERSE;
893
894	if (grid_compare(c->status.grid, old_status.grid) == 0) {
895		screen_free(&old_status);
896		return (0);
897	}
898	screen_free(&old_status);
899	return (1);
900}
901
902/* Handle keys in prompt. */
903void
904status_prompt_key(struct client *c, int key)
905{
906	struct session		*sess = c->session;
907	struct options		*oo = &sess->options;
908	struct paste_buffer	*pb;
909	char			*s, *first, *last, word[64], swapc;
910	const char		*histstr;
911	const char		*wsep = NULL;
912	u_char			 ch;
913	size_t			 size, n, off, idx;
914
915	size = strlen(c->prompt_buffer);
916	switch (mode_key_lookup(&c->prompt_mdata, key, NULL)) {
917	case MODEKEYEDIT_CURSORLEFT:
918		if (c->prompt_index > 0) {
919			c->prompt_index--;
920			c->flags |= CLIENT_STATUS;
921		}
922		break;
923	case MODEKEYEDIT_SWITCHMODE:
924		c->flags |= CLIENT_STATUS;
925		break;
926	case MODEKEYEDIT_SWITCHMODEAPPEND:
927		c->flags |= CLIENT_STATUS;
928		/* FALLTHROUGH */
929	case MODEKEYEDIT_CURSORRIGHT:
930		if (c->prompt_index < size) {
931			c->prompt_index++;
932			c->flags |= CLIENT_STATUS;
933		}
934		break;
935	case MODEKEYEDIT_SWITCHMODEBEGINLINE:
936		c->flags |= CLIENT_STATUS;
937		/* FALLTHROUGH */
938	case MODEKEYEDIT_STARTOFLINE:
939		if (c->prompt_index != 0) {
940			c->prompt_index = 0;
941			c->flags |= CLIENT_STATUS;
942		}
943		break;
944	case MODEKEYEDIT_SWITCHMODEAPPENDLINE:
945		c->flags |= CLIENT_STATUS;
946		/* FALLTHROUGH */
947	case MODEKEYEDIT_ENDOFLINE:
948		if (c->prompt_index != size) {
949			c->prompt_index = size;
950			c->flags |= CLIENT_STATUS;
951		}
952		break;
953	case MODEKEYEDIT_COMPLETE:
954		if (*c->prompt_buffer == '\0')
955			break;
956
957		idx = c->prompt_index;
958		if (idx != 0)
959			idx--;
960
961		/* Find the word we are in. */
962		first = c->prompt_buffer + idx;
963		while (first > c->prompt_buffer && *first != ' ')
964			first--;
965		while (*first == ' ')
966			first++;
967		last = c->prompt_buffer + idx;
968		while (*last != '\0' && *last != ' ')
969			last++;
970		while (*last == ' ')
971			last--;
972		if (*last != '\0')
973			last++;
974		if (last <= first ||
975		    ((size_t) (last - first)) > (sizeof word) - 1)
976			break;
977		memcpy(word, first, last - first);
978		word[last - first] = '\0';
979
980		/* And try to complete it. */
981		if ((s = status_prompt_complete(word)) == NULL)
982			break;
983
984		/* Trim out word. */
985		n = size - (last - c->prompt_buffer) + 1; /* with \0 */
986		memmove(first, last, n);
987		size -= last - first;
988
989		/* Insert the new word. */
990		size += strlen(s);
991		off = first - c->prompt_buffer;
992		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 1);
993		first = c->prompt_buffer + off;
994		memmove(first + strlen(s), first, n);
995		memcpy(first, s, strlen(s));
996
997		c->prompt_index = (first - c->prompt_buffer) + strlen(s);
998		free(s);
999
1000		c->flags |= CLIENT_STATUS;
1001		break;
1002	case MODEKEYEDIT_BACKSPACE:
1003		if (c->prompt_index != 0) {
1004			if (c->prompt_index == size)
1005				c->prompt_buffer[--c->prompt_index] = '\0';
1006			else {
1007				memmove(c->prompt_buffer + c->prompt_index - 1,
1008				    c->prompt_buffer + c->prompt_index,
1009				    size + 1 - c->prompt_index);
1010				c->prompt_index--;
1011			}
1012			c->flags |= CLIENT_STATUS;
1013		}
1014		break;
1015	case MODEKEYEDIT_DELETE:
1016	case MODEKEYEDIT_SWITCHMODESUBSTITUTE:
1017		if (c->prompt_index != size) {
1018			memmove(c->prompt_buffer + c->prompt_index,
1019			    c->prompt_buffer + c->prompt_index + 1,
1020			    size + 1 - c->prompt_index);
1021			c->flags |= CLIENT_STATUS;
1022		}
1023		break;
1024	case MODEKEYEDIT_DELETELINE:
1025	case MODEKEYEDIT_SWITCHMODESUBSTITUTELINE:
1026		*c->prompt_buffer = '\0';
1027		c->prompt_index = 0;
1028		c->flags |= CLIENT_STATUS;
1029		break;
1030	case MODEKEYEDIT_DELETETOENDOFLINE:
1031	case MODEKEYEDIT_SWITCHMODECHANGELINE:
1032		if (c->prompt_index < size) {
1033			c->prompt_buffer[c->prompt_index] = '\0';
1034			c->flags |= CLIENT_STATUS;
1035		}
1036		break;
1037	case MODEKEYEDIT_DELETEWORD:
1038		wsep = options_get_string(oo, "word-separators");
1039		idx = c->prompt_index;
1040
1041		/* Find a non-separator. */
1042		while (idx != 0) {
1043			idx--;
1044			if (!strchr(wsep, c->prompt_buffer[idx]))
1045				break;
1046		}
1047
1048		/* Find the separator at the beginning of the word. */
1049		while (idx != 0) {
1050			idx--;
1051			if (strchr(wsep, c->prompt_buffer[idx])) {
1052				/* Go back to the word. */
1053				idx++;
1054				break;
1055			}
1056		}
1057
1058		memmove(c->prompt_buffer + idx,
1059		    c->prompt_buffer + c->prompt_index,
1060		    size + 1 - c->prompt_index);
1061		memset(c->prompt_buffer + size - (c->prompt_index - idx),
1062		    '\0', c->prompt_index - idx);
1063		c->prompt_index = idx;
1064		c->flags |= CLIENT_STATUS;
1065		break;
1066	case MODEKEYEDIT_NEXTSPACE:
1067		wsep = " ";
1068		/* FALLTHROUGH */
1069	case MODEKEYEDIT_NEXTWORD:
1070		if (wsep == NULL)
1071			wsep = options_get_string(oo, "word-separators");
1072
1073		/* Find a separator. */
1074		while (c->prompt_index != size) {
1075			c->prompt_index++;
1076			if (strchr(wsep, c->prompt_buffer[c->prompt_index]))
1077				break;
1078		}
1079
1080		/* Find the word right after the separation. */
1081		while (c->prompt_index != size) {
1082			c->prompt_index++;
1083			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1084				break;
1085		}
1086
1087		c->flags |= CLIENT_STATUS;
1088		break;
1089	case MODEKEYEDIT_NEXTSPACEEND:
1090		wsep = " ";
1091		/* FALLTHROUGH */
1092	case MODEKEYEDIT_NEXTWORDEND:
1093		if (wsep == NULL)
1094			wsep = options_get_string(oo, "word-separators");
1095
1096		/* Find a word. */
1097		while (c->prompt_index != size) {
1098			c->prompt_index++;
1099			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1100				break;
1101		}
1102
1103		/* Find the separator at the end of the word. */
1104		while (c->prompt_index != size) {
1105			c->prompt_index++;
1106			if (strchr(wsep, c->prompt_buffer[c->prompt_index]))
1107				break;
1108		}
1109
1110		/* Back up to the end-of-word like vi. */
1111		if (options_get_number(oo, "status-keys") == MODEKEY_VI &&
1112		    c->prompt_index != 0)
1113			c->prompt_index--;
1114
1115		c->flags |= CLIENT_STATUS;
1116		break;
1117	case MODEKEYEDIT_PREVIOUSSPACE:
1118		wsep = " ";
1119		/* FALLTHROUGH */
1120	case MODEKEYEDIT_PREVIOUSWORD:
1121		if (wsep == NULL)
1122			wsep = options_get_string(oo, "word-separators");
1123
1124		/* Find a non-separator. */
1125		while (c->prompt_index != 0) {
1126			c->prompt_index--;
1127			if (!strchr(wsep, c->prompt_buffer[c->prompt_index]))
1128				break;
1129		}
1130
1131		/* Find the separator at the beginning of the word. */
1132		while (c->prompt_index != 0) {
1133			c->prompt_index--;
1134			if (strchr(wsep, c->prompt_buffer[c->prompt_index])) {
1135				/* Go back to the word. */
1136				c->prompt_index++;
1137				break;
1138			}
1139		}
1140
1141		c->flags |= CLIENT_STATUS;
1142		break;
1143	case MODEKEYEDIT_HISTORYUP:
1144		histstr = status_prompt_up_history(&c->prompt_hindex);
1145		if (histstr == NULL)
1146			break;
1147		free(c->prompt_buffer);
1148		c->prompt_buffer = xstrdup(histstr);
1149		c->prompt_index = strlen(c->prompt_buffer);
1150		c->flags |= CLIENT_STATUS;
1151		break;
1152	case MODEKEYEDIT_HISTORYDOWN:
1153		histstr = status_prompt_down_history(&c->prompt_hindex);
1154		if (histstr == NULL)
1155			break;
1156		free(c->prompt_buffer);
1157		c->prompt_buffer = xstrdup(histstr);
1158		c->prompt_index = strlen(c->prompt_buffer);
1159		c->flags |= CLIENT_STATUS;
1160		break;
1161	case MODEKEYEDIT_PASTE:
1162		if ((pb = paste_get_top(&global_buffers)) == NULL)
1163			break;
1164		for (n = 0; n < pb->size; n++) {
1165			ch = (u_char) pb->data[n];
1166			if (ch < 32 || ch == 127)
1167				break;
1168		}
1169
1170		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + n + 1);
1171		if (c->prompt_index == size) {
1172			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
1173			c->prompt_index += n;
1174			c->prompt_buffer[c->prompt_index] = '\0';
1175		} else {
1176			memmove(c->prompt_buffer + c->prompt_index + n,
1177			    c->prompt_buffer + c->prompt_index,
1178			    size + 1 - c->prompt_index);
1179			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
1180			c->prompt_index += n;
1181		}
1182
1183		c->flags |= CLIENT_STATUS;
1184		break;
1185	case MODEKEYEDIT_TRANSPOSECHARS:
1186		idx = c->prompt_index;
1187		if (idx < size)
1188			idx++;
1189		if (idx >= 2) {
1190			swapc = c->prompt_buffer[idx - 2];
1191			c->prompt_buffer[idx - 2] = c->prompt_buffer[idx - 1];
1192			c->prompt_buffer[idx - 1] = swapc;
1193			c->prompt_index = idx;
1194			c->flags |= CLIENT_STATUS;
1195		}
1196		break;
1197	case MODEKEYEDIT_ENTER:
1198		if (*c->prompt_buffer != '\0')
1199			status_prompt_add_history(c->prompt_buffer);
1200		if (c->prompt_callbackfn(c->prompt_data, c->prompt_buffer) == 0)
1201			status_prompt_clear(c);
1202		break;
1203	case MODEKEYEDIT_CANCEL:
1204		if (c->prompt_callbackfn(c->prompt_data, NULL) == 0)
1205			status_prompt_clear(c);
1206		break;
1207	case MODEKEY_OTHER:
1208		if ((key & 0xff00) != 0 || key < 32 || key == 127)
1209			break;
1210		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 2);
1211
1212		if (c->prompt_index == size) {
1213			c->prompt_buffer[c->prompt_index++] = key;
1214			c->prompt_buffer[c->prompt_index] = '\0';
1215		} else {
1216			memmove(c->prompt_buffer + c->prompt_index + 1,
1217			    c->prompt_buffer + c->prompt_index,
1218			    size + 1 - c->prompt_index);
1219			c->prompt_buffer[c->prompt_index++] = key;
1220		}
1221
1222		if (c->prompt_flags & PROMPT_SINGLE) {
1223			if (c->prompt_callbackfn(
1224			    c->prompt_data, c->prompt_buffer) == 0)
1225				status_prompt_clear(c);
1226		}
1227
1228		c->flags |= CLIENT_STATUS;
1229		break;
1230	default:
1231		break;
1232	}
1233}
1234
1235/* Get previous line from the history. */
1236const char *
1237status_prompt_up_history(u_int *idx)
1238{
1239	u_int size;
1240
1241	/*
1242	 * History runs from 0 to size - 1.
1243	 *
1244	 * Index is from 0 to size. Zero is empty.
1245	 */
1246
1247	size = ARRAY_LENGTH(&status_prompt_history);
1248	if (size == 0 || *idx == size)
1249		return (NULL);
1250	(*idx)++;
1251	return (ARRAY_ITEM(&status_prompt_history, size - *idx));
1252}
1253
1254/* Get next line from the history. */
1255const char *
1256status_prompt_down_history(u_int *idx)
1257{
1258	u_int size;
1259
1260	size = ARRAY_LENGTH(&status_prompt_history);
1261	if (size == 0 || *idx == 0)
1262		return ("");
1263	(*idx)--;
1264	if (*idx == 0)
1265		return ("");
1266	return (ARRAY_ITEM(&status_prompt_history, size - *idx));
1267}
1268
1269/* Add line to the history. */
1270void
1271status_prompt_add_history(const char *line)
1272{
1273	u_int size;
1274
1275	size = ARRAY_LENGTH(&status_prompt_history);
1276	if (size > 0 && strcmp(ARRAY_LAST(&status_prompt_history), line) == 0)
1277		return;
1278
1279	if (size == PROMPT_HISTORY) {
1280		free(ARRAY_FIRST(&status_prompt_history));
1281		ARRAY_REMOVE(&status_prompt_history, 0);
1282	}
1283
1284	ARRAY_ADD(&status_prompt_history, xstrdup(line));
1285}
1286
1287/* Complete word. */
1288char *
1289status_prompt_complete(const char *s)
1290{
1291	const struct cmd_entry 	  	       **cmdent;
1292	const struct options_table_entry	*oe;
1293	ARRAY_DECL(, const char *)		 list;
1294	char					*prefix, *s2;
1295	u_int					 i;
1296	size_t				 	 j;
1297
1298	if (*s == '\0')
1299		return (NULL);
1300
1301	/* First, build a list of all the possible matches. */
1302	ARRAY_INIT(&list);
1303	for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
1304		if (strncmp((*cmdent)->name, s, strlen(s)) == 0)
1305			ARRAY_ADD(&list, (*cmdent)->name);
1306	}
1307	for (oe = server_options_table; oe->name != NULL; oe++) {
1308		if (strncmp(oe->name, s, strlen(s)) == 0)
1309			ARRAY_ADD(&list, oe->name);
1310	}
1311	for (oe = session_options_table; oe->name != NULL; oe++) {
1312		if (strncmp(oe->name, s, strlen(s)) == 0)
1313			ARRAY_ADD(&list, oe->name);
1314	}
1315	for (oe = window_options_table; oe->name != NULL; oe++) {
1316		if (strncmp(oe->name, s, strlen(s)) == 0)
1317			ARRAY_ADD(&list, oe->name);
1318	}
1319
1320	/* If none, bail now. */
1321	if (ARRAY_LENGTH(&list) == 0) {
1322		ARRAY_FREE(&list);
1323		return (NULL);
1324	}
1325
1326	/* If an exact match, return it, with a trailing space. */
1327	if (ARRAY_LENGTH(&list) == 1) {
1328		xasprintf(&s2, "%s ", ARRAY_FIRST(&list));
1329		ARRAY_FREE(&list);
1330		return (s2);
1331	}
1332
1333	/* Now loop through the list and find the longest common prefix. */
1334	prefix = xstrdup(ARRAY_FIRST(&list));
1335	for (i = 1; i < ARRAY_LENGTH(&list); i++) {
1336		s = ARRAY_ITEM(&list, i);
1337
1338		j = strlen(s);
1339		if (j > strlen(prefix))
1340			j = strlen(prefix);
1341		for (; j > 0; j--) {
1342			if (prefix[j - 1] != s[j - 1])
1343				prefix[j - 1] = '\0';
1344		}
1345	}
1346
1347	ARRAY_FREE(&list);
1348	return (prefix);
1349}
1350