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Permit top-bit-set characters to be entered in the status line. They could
already be set from the shell and are just passed through when printing (so
invisible characters or displaying on terminals with different character sets
may cause problems).

Note that entering UTF-8 may not work and in any case currently the status line
cannot display it correctly (outside of status-left/status-right).

/* $OpenBSD: status.c,v 1.43 2009/11/17 13:30:07 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/time.h>

#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

char   *status_job(struct client *, char **);
void	status_job_callback(struct job *);
size_t	status_width(struct winlink *);
char   *status_print(struct session *, struct winlink *, struct grid_cell *);
void	status_message_callback(int, short, void *);

void	status_prompt_add_history(struct client *);
char   *status_prompt_complete(const char *);

/* Draw status for client on the last lines of given context. */
int
status_redraw(struct client *c)
{
	struct screen_write_ctx		ctx;
	struct session		       *s = c->session;
	struct winlink		       *wl;
	struct screen		      	old_status;
	char		 	       *left, *right, *text, *ptr;
	size_t				llen, llen2, rlen, rlen2, offset;
	size_t				ox, xx, yy, size, start, width;
	struct grid_cell	        stdgc, sl_stdgc, sr_stdgc, gc;
	int				larrow, rarrow, utf8flag;
	int				sl_fg, sl_bg, sr_fg, sr_bg;
	int				sl_attr, sr_attr;

	left = right = NULL;

	/* No status line?*/
	if (c->tty.sy == 0 || !options_get_number(&s->options, "status"))
		return (1);
	larrow = rarrow = 0;

	/* Create the target screen. */
	memcpy(&old_status, &c->status, sizeof old_status);
	screen_init(&c->status, c->tty.sx, 1, 0);

	if (gettimeofday(&c->status_timer, NULL) != 0)
		fatal("gettimeofday failed");
	memcpy(&stdgc, &grid_default_cell, sizeof gc);
	colour_set_fg(&stdgc, options_get_number(&s->options, "status-fg"));
	colour_set_bg(&stdgc, options_get_number(&s->options, "status-bg"));
	stdgc.attr |= options_get_number(&s->options, "status-attr");

	/* 
	 * Set the status-left and status-right parts to the default status
	 * line options and only change them where they differ from the
	 * defaults.
	 */
	memcpy(&sl_stdgc, &stdgc, sizeof sl_stdgc);
	memcpy(&sr_stdgc, &stdgc, sizeof sr_stdgc);
	sl_fg = options_get_number(&s->options, "status-left-fg");
	if (sl_fg != 8)
		colour_set_fg(&sl_stdgc, sl_fg);
	sl_bg = options_get_number(&s->options, "status-left-bg");
	if (sl_bg != 8)
		colour_set_bg(&sl_stdgc, sl_bg);
	sl_attr = options_get_number(&s->options, "status-left-attr");
	if (sl_attr != 0)
		sl_stdgc.attr = sl_attr;
	sr_fg = options_get_number(&s->options, "status-right-fg");
	if (sr_fg != 8)
		colour_set_fg(&sr_stdgc, sr_fg);
	sr_bg = options_get_number(&s->options, "status-right-bg");
	if (sr_bg != 8)
		colour_set_bg(&sr_stdgc, sr_bg);
	sr_attr = options_get_number(&s->options, "status-right-attr");
	if (sr_attr != 0)
		sr_stdgc.attr = sr_attr;

	yy = c->tty.sy - 1;
	if (yy == 0)
		goto blank;

	/* Caring about UTF-8 in status line? */
	utf8flag = options_get_number(&s->options, "status-utf8");

	/* Work out the left and right strings. */
	left = status_replace(c, options_get_string(
	    &s->options, "status-left"), c->status_timer.tv_sec);
	llen = options_get_number(&s->options, "status-left-length");
	llen2 = screen_write_cstrlen(utf8flag, "%s", left);
	if (llen2 < llen)
		llen = llen2;

	right = status_replace(c, options_get_string(
	    &s->options, "status-right"), c->status_timer.tv_sec);
	rlen = options_get_number(&s->options, "status-right-length");
	rlen2 = screen_write_cstrlen(utf8flag, "%s", right);
	if (rlen2 < rlen)
		rlen = rlen2;

	/*
	 * Figure out how much space we have for the window list. If there isn't
	 * enough space, just wimp out.
	 */
	xx = 0;
	if (llen != 0)
		xx += llen + 1;
	if (rlen != 0)
		xx += rlen + 1;
	if (c->tty.sx == 0 || c->tty.sx <= xx)
		goto blank;
	xx = c->tty.sx - xx;

	/*
	 * Right. We have xx characters to fill. Find out how much is to go in
	 * them and the offset of the current window (it must be on screen).
	 */
	width = offset = 0;
	RB_FOREACH(wl, winlinks, &s->windows) {
		size = status_width(wl) + 1;
		if (wl == s->curw)
			offset = width;
		width += size;
	}
	start = 0;

	/* If there is enough space for the total width, all is gravy. */
	if (width <= xx)
		goto draw;

	/* Find size of current window text. */
	size = status_width(s->curw);

	/*
	 * If the offset is already on screen, we're good to draw from the
	 * start and just leave off the end.
	 */
	if (offset + size < xx) {
		if (xx > 0) {
			rarrow = 1;
			xx--;
		}

		width = xx;
		goto draw;
	}

	/*
	 * Work out how many characters we need to omit from the start. There
	 * are xx characters to fill, and offset + size must be the last. So,
	 * the start character is offset + size - xx.
	 */
	if (xx > 0) {
		larrow = 1;
		xx--;
	}

	start = offset + size - xx;
 	if (xx > 0 && width > start + xx + 1) { /* + 1, eh? */
 		rarrow = 1;
 		start++;
 		xx--;
 	}
 	width = xx;

draw:
	/* Bail here if anything is too small too. XXX. */
	if (width == 0 || xx == 0)
		goto blank;

 	/* Begin drawing and move to the starting position. */
	screen_write_start(&ctx, NULL, &c->status);
	if (llen != 0) {
 		screen_write_cursormove(&ctx, 0, yy);
		screen_write_cnputs(&ctx, llen, &sl_stdgc, utf8flag, "%s", left);
		screen_write_putc(&ctx, &stdgc, ' ');
		if (larrow)
			screen_write_putc(&ctx, &stdgc, ' ');
	} else {
		if (larrow)
			screen_write_cursormove(&ctx, 1, yy);
		else
			screen_write_cursormove(&ctx, 0, yy);
	}

	ox = 0;
	if (width < xx) {
		switch (options_get_number(&s->options, "status-justify")) {
		case 1:	/* centered */
			ox = 1 + (xx - width) / 2;
			break;
		case 2:	/* right */
			ox = 1 + (xx - width);
			break;
		}
		xx -= ox;
		while (ox-- > 0)
			screen_write_putc(&ctx, &stdgc, ' ');
	}

	/* Draw each character in succession. */
	offset = 0;
	RB_FOREACH(wl, winlinks, &s->windows) {
		memcpy(&gc, &stdgc, sizeof gc);
		text = status_print(s, wl, &gc);

		if (larrow == 1 && offset < start) {
			if (session_alert_has(s, wl, WINDOW_ACTIVITY))
				larrow = -1;
			else if (session_alert_has(s, wl, WINDOW_BELL))
				larrow = -1;
			else if (session_alert_has(s, wl, WINDOW_CONTENT))
				larrow = -1;
		}

 		for (ptr = text; *ptr != '\0'; ptr++) {
			if (offset >= start && offset < start + width)
				screen_write_putc(&ctx, &gc, *ptr);
			offset++;
		}

		if (rarrow == 1 && offset > start + width) {
			if (session_alert_has(s, wl, WINDOW_ACTIVITY))
				rarrow = -1;
			else if (session_alert_has(s, wl, WINDOW_BELL))
				rarrow = -1;
			else if (session_alert_has(s, wl, WINDOW_CONTENT))
				rarrow = -1;
		}

		if (offset < start + width) {
			if (offset >= start) {
				screen_write_putc(&ctx, &stdgc, ' ');
			}
			offset++;
		}

		xfree(text);
	}

	/* Fill the remaining space if any. */
 	while (offset++ < xx)
		screen_write_putc(&ctx, &stdgc, ' ');

	/* Draw the last item. */
	if (rlen != 0) {
		screen_write_cursormove(&ctx, c->tty.sx - rlen - 1, yy);
		screen_write_putc(&ctx, &stdgc, ' ');
		screen_write_cnputs(&ctx, rlen, &sr_stdgc, utf8flag, "%s", right);
	}

	/* Draw the arrows. */
	if (larrow != 0) {
		memcpy(&gc, &stdgc, sizeof gc);
		if (larrow == -1)
			gc.attr ^= GRID_ATTR_REVERSE;
		if (llen != 0)
			screen_write_cursormove(&ctx, llen + 1, yy);
		else
			screen_write_cursormove(&ctx, 0, yy);
		screen_write_putc(&ctx, &gc, '<');
	}
	if (rarrow != 0) {
		memcpy(&gc, &stdgc, sizeof gc);
		if (rarrow == -1)
			gc.attr ^= GRID_ATTR_REVERSE;
		if (rlen != 0)
			screen_write_cursormove(&ctx, c->tty.sx - rlen - 2, yy);
		else
			screen_write_cursormove(&ctx, c->tty.sx - 1, yy);
		screen_write_putc(&ctx, &gc, '>');
	}

	goto out;

blank:
 	/* Just draw the whole line as blank. */
	screen_write_start(&ctx, NULL, &c->status);
	screen_write_cursormove(&ctx, 0, yy);
	for (offset = 0; offset < c->tty.sx; offset++)
		screen_write_putc(&ctx, &stdgc, ' ');

out:
	screen_write_stop(&ctx);

	if (left != NULL)
		xfree(left);
	if (right != NULL)
		xfree(right);

	if (grid_compare(c->status.grid, old_status.grid) == 0) {
		screen_free(&old_status);
		return (0);
	}
	screen_free(&old_status);
	return (1);
}

char *
status_replace(struct client *c, const char *fmt, time_t t)
{
	struct session *s = c->session;
	struct winlink *wl = s->curw;
	static char	out[BUFSIZ];
	char		in[BUFSIZ], tmp[256], ch, *iptr, *optr, *ptr, *endptr;
	char           *savedptr;	/* freed at end of each loop */
	size_t		len;
	long		n;
	
	
	strftime(in, sizeof in, fmt, localtime(&t));
	in[(sizeof in) - 1] = '\0';

	iptr = in;
	optr = out;
	savedptr = NULL;

	while (*iptr != '\0') {
		if (optr >= out + (sizeof out) - 1)
			break;
		switch (ch = *iptr++) {
		case '#':
			errno = 0;
			n = strtol(iptr, &endptr, 10);
			if ((n == 0 && errno != EINVAL) ||
			    (n == LONG_MIN && errno != ERANGE) ||
			    (n == LONG_MAX && errno != ERANGE) ||
			    n != 0)
				iptr = endptr;
			if (n <= 0)
				n = LONG_MAX;

			ptr = NULL;
			switch (*iptr++) {
			case '(':
				if (ptr == NULL) {
					ptr = status_job(c, &iptr);
					if (ptr == NULL)
						break;
					savedptr = ptr;
				}
				/* FALLTHROUGH */
			case 'H':
				if (ptr == NULL) {
					if (gethostname(tmp, sizeof tmp) != 0)
						fatal("gethostname failed");
					ptr = tmp;
				}
				/* FALLTHROUGH */
			case 'I':
				if (ptr == NULL) {
					xsnprintf(tmp, sizeof tmp, "%d", wl->idx);
					ptr = tmp;
				}
				/* FALLTHROUGH */
			case 'P':
				if (ptr == NULL) {
					xsnprintf(tmp, sizeof tmp, "%u",
					    window_pane_index(wl->window,
					    wl->window->active));
					ptr = tmp;
				}
				/* FALLTHROUGH */
			case 'S':
				if (ptr == NULL)
					ptr = s->name;
				/* FALLTHROUGH */
			case 'T':
				if (ptr == NULL)
					ptr = wl->window->active->base.title;
				/* FALLTHROUGH */
			case 'W':
				if (ptr == NULL)
					ptr = wl->window->name;
				len = strlen(ptr);
				if ((size_t) n < len)
					len = n;
				if (optr + len >= out + (sizeof out) - 1)
					break;
				while (len > 0 && *ptr != '\0') {
					*optr++ = *ptr++;
					len--;
				}
				break;
			case '[':
				/* 
				 * Embedded style, handled at display time.
				 * Leave present and skip input until ].
				 */
				*optr++ = '#';

				iptr--;	/* include [ */
				while (*iptr != ']' && *iptr != '\0') {
					if (optr >= out + (sizeof out) - 1)
						break;
					*optr++ = *iptr++;
				}
				break;
			case '#':
				*optr++ = '#';
				break;
			}
			if (savedptr != NULL) {
				xfree(savedptr);
				savedptr = NULL;
			}
			break;
		default:
			*optr++ = ch;
			break;
		}
	}
	*optr = '\0';

	return (xstrdup(out));
}

char *
status_job(struct client *c, char **iptr)
{
	struct job	*job;
	char   		*cmd;
	int		 lastesc;
	size_t		 len;

	if (**iptr == '\0')
		return (NULL);
	if (**iptr == ')') {		/* no command given */
		(*iptr)++;
		return (NULL);
	}

	cmd = xmalloc(strlen(*iptr) + 1);
	len = 0;

	lastesc = 0;
	for (; **iptr != '\0'; (*iptr)++) {
		if (!lastesc && **iptr == ')')
			break;		/* unescaped ) is the end */
		if (!lastesc && **iptr == '\\') {
			lastesc = 1;
			continue;	/* skip \ if not escaped */
		}
		lastesc = 0;
		cmd[len++] = **iptr;
	}
	if (**iptr == '\0')		/* no terminating ) */ {
		xfree(cmd);
		return (NULL);
	}
	(*iptr)++;			/* skip final ) */
	cmd[len] = '\0';

	job = job_get(&c->status_jobs, cmd);
	if (job == NULL) {
		job = job_add(&c->status_jobs,
		    JOB_PERSIST, c, cmd, status_job_callback, xfree, NULL);
		job_run(job);
	}
	if (job->data == NULL)
		return (xstrdup(""));
	return (xstrdup(job->data));
}

void
status_job_callback(struct job *job)
{
	char	*line, *buf;
	size_t	 len;

	buf = NULL;
	if ((line = evbuffer_readline(job->event->input)) == NULL) {
		len = EVBUFFER_LENGTH(job->event->input);
		buf = xmalloc(len + 1);
		if (len != 0)
			memcpy(buf, EVBUFFER_DATA(job->event->input), len);
		buf[len] = '\0';
	}

	if (job->data != NULL)
		xfree(job->data);
	else
		server_redraw_client(job->client);
	job->data = xstrdup(line);

	if (buf != NULL)
		xfree(buf);
}

size_t
status_width(struct winlink *wl)
{
	return (xsnprintf(NULL, 0, "%d:%s ", wl->idx, wl->window->name));
}

char *
status_print(struct session *s, struct winlink *wl, struct grid_cell *gc)
{
	struct options	*oo = &wl->window->options;
	char   		*text, flag;
	u_char		 fg, bg, attr;

	fg = options_get_number(oo, "window-status-fg");
	if (fg != 8)
		colour_set_fg(gc, fg);
	bg = options_get_number(oo, "window-status-bg");
	if (bg != 8)
		colour_set_bg(gc, bg);
	attr = options_get_number(oo, "window-status-attr");
	if (attr != 0)
		gc->attr = attr;

	flag = ' ';
 	if (wl == TAILQ_FIRST(&s->lastw))
		flag = '-';
	if (wl == s->curw) {
		fg = options_get_number(oo, "window-status-current-fg");
		if (fg != 8)
			colour_set_fg(gc, fg);
		bg = options_get_number(oo, "window-status-current-bg");
		if (bg != 8)
			colour_set_bg(gc, bg);
		attr = options_get_number(oo, "window-status-current-attr");
		if (attr != 0)
			gc->attr = attr;
		flag = '*';
	}

	if (session_alert_has(s, wl, WINDOW_ACTIVITY)) {
		flag = '#';
		gc->attr ^= GRID_ATTR_REVERSE;
	} else if (session_alert_has(s, wl, WINDOW_BELL)) {
		flag = '!';
		gc->attr ^= GRID_ATTR_REVERSE;
	} else if (session_alert_has(s, wl, WINDOW_CONTENT)) {
		flag = '+';
		gc->attr ^= GRID_ATTR_REVERSE;
	}

	xasprintf(&text, "%d:%s%c", wl->idx, wl->window->name, flag);
	return (text);
}

void printflike2
status_message_set(struct client *c, const char *fmt, ...)
{
	struct timeval	tv;
	va_list		ap;
	int		delay;

	status_prompt_clear(c);
	status_message_clear(c);

	va_start(ap, fmt);
	xvasprintf(&c->message_string, fmt, ap);
	va_end(ap);

	delay = options_get_number(&c->session->options, "display-time");
	tv.tv_sec = delay / 1000;
	tv.tv_usec = (delay % 1000) * 1000L;
	
	evtimer_del(&c->message_timer);
	evtimer_set(&c->message_timer, status_message_callback, c);
	evtimer_add(&c->message_timer, &tv);

	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
	c->flags |= CLIENT_STATUS;
}

void
status_message_clear(struct client *c)
{
	if (c->message_string == NULL)
		return;

	xfree(c->message_string);
	c->message_string = NULL;

	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */

	screen_reinit(&c->status);
}

void
status_message_callback(unused int fd, unused short event, void *data)
{
	struct client	*c = data;

	status_message_clear(c);
}

/* Draw client message on status line of present else on last line. */
int
status_message_redraw(struct client *c)
{
	struct screen_write_ctx		ctx;
	struct session		       *s = c->session;
	struct screen		        old_status;
	size_t			        len;
	struct grid_cell		gc;

	if (c->tty.sx == 0 || c->tty.sy == 0)
		return (0);
	memcpy(&old_status, &c->status, sizeof old_status);
	screen_init(&c->status, c->tty.sx, 1, 0);

	len = strlen(c->message_string);
	if (len > c->tty.sx)
		len = c->tty.sx;

	memcpy(&gc, &grid_default_cell, sizeof gc);
	colour_set_fg(&gc, options_get_number(&s->options, "message-fg"));
	colour_set_bg(&gc, options_get_number(&s->options, "message-bg"));
	gc.attr |= options_get_number(&s->options, "message-attr");

	screen_write_start(&ctx, NULL, &c->status);

	screen_write_cursormove(&ctx, 0, 0);
	screen_write_puts(&ctx, &gc, "%.*s", (int) len, c->message_string);
	for (; len < c->tty.sx; len++)
		screen_write_putc(&ctx, &gc, ' ');

	screen_write_stop(&ctx);

	if (grid_compare(c->status.grid, old_status.grid) == 0) {
		screen_free(&old_status);
		return (0);
	}
	screen_free(&old_status);
	return (1);
}

void
status_prompt_set(struct client *c, const char *msg,
    int (*callbackfn)(void *, const char *), void (*freefn)(void *),
    void *data, int flags)
{
	int	keys;

	status_message_clear(c);
	status_prompt_clear(c);

	c->prompt_string = xstrdup(msg);

	c->prompt_buffer = xstrdup("");
	c->prompt_index = 0;

	c->prompt_callbackfn = callbackfn;
	c->prompt_freefn = freefn;
	c->prompt_data = data;

	c->prompt_hindex = 0;

	c->prompt_flags = flags;

	keys = options_get_number(&c->session->options, "status-keys");
	if (keys == MODEKEY_EMACS)
		mode_key_init(&c->prompt_mdata, &mode_key_tree_emacs_edit);
	else
		mode_key_init(&c->prompt_mdata, &mode_key_tree_vi_edit);

	c->tty.flags |= (TTY_NOCURSOR|TTY_FREEZE);
	c->flags |= CLIENT_STATUS;
}

void
status_prompt_clear(struct client *c)
{
 	if (c->prompt_string == NULL)
		return;

	if (c->prompt_freefn != NULL && c->prompt_data != NULL)
		c->prompt_freefn(c->prompt_data);

	xfree(c->prompt_string);
	c->prompt_string = NULL;

	xfree(c->prompt_buffer);
	c->prompt_buffer = NULL;

	c->tty.flags &= ~(TTY_NOCURSOR|TTY_FREEZE);
	c->flags |= CLIENT_REDRAW; /* screen was frozen and may have changed */

	screen_reinit(&c->status);
}

void
status_prompt_update(struct client *c, const char *msg)
{
	xfree(c->prompt_string);
	c->prompt_string = xstrdup(msg);

	*c->prompt_buffer = '\0';
	c->prompt_index = 0;

	c->prompt_hindex = 0;

	c->flags |= CLIENT_STATUS;
}

/* Draw client prompt on status line of present else on last line. */
int
status_prompt_redraw(struct client *c)
{
	struct screen_write_ctx	ctx;
	struct session		       *s = c->session;
	struct screen		        old_status;
	size_t			        i, size, left, len, off;
	char				ch;
	struct grid_cell		gc;

	if (c->tty.sx == 0 || c->tty.sy == 0)
		return (0);
	memcpy(&old_status, &c->status, sizeof old_status);
	screen_init(&c->status, c->tty.sx, 1, 0);
	off = 0;

	len = strlen(c->prompt_string);
	if (len > c->tty.sx)
		len = c->tty.sx;

	memcpy(&gc, &grid_default_cell, sizeof gc);
	colour_set_fg(&gc, options_get_number(&s->options, "message-fg"));
	colour_set_bg(&gc, options_get_number(&s->options, "message-bg"));
	gc.attr |= options_get_number(&s->options, "message-attr");

	screen_write_start(&ctx, NULL, &c->status);

	screen_write_cursormove(&ctx, 0, 0);
	screen_write_puts(&ctx, &gc, "%.*s", (int) len, c->prompt_string);

	left = c->tty.sx - len;
	if (left != 0) {
		if (c->prompt_index < left)
			size = strlen(c->prompt_buffer);
		else {
			off = c->prompt_index - left + 1;
			if (c->prompt_index == strlen(c->prompt_buffer))
				left--;
			size = left;
		}
		screen_write_puts(
		    &ctx, &gc, "%.*s", (int) left, c->prompt_buffer + off);

		for (i = len + size; i < c->tty.sx; i++)
			screen_write_putc(&ctx, &gc, ' ');

		/* Draw a fake cursor. */
		ch = ' ';
		screen_write_cursormove(&ctx, len + c->prompt_index - off, 0);
		if (c->prompt_index < strlen(c->prompt_buffer))
			ch = c->prompt_buffer[c->prompt_index];
		gc.attr ^= GRID_ATTR_REVERSE;
		screen_write_putc(&ctx, &gc, ch);
	}

	screen_write_stop(&ctx);

	if (grid_compare(c->status.grid, old_status.grid) == 0) {
		screen_free(&old_status);
		return (0);
	}
	screen_free(&old_status);
	return (1);
}

/* Handle keys in prompt. */
void
status_prompt_key(struct client *c, int key)
{
	struct paste_buffer	*pb;
	char   			*s, *first, *last, word[64], swapc;
	size_t			 size, n, off, idx;

	size = strlen(c->prompt_buffer);
	switch (mode_key_lookup(&c->prompt_mdata, key)) {
	case MODEKEYEDIT_CURSORLEFT:
		if (c->prompt_index > 0) {
			c->prompt_index--;
			c->flags |= CLIENT_STATUS;
		}
		break;
	case MODEKEYEDIT_SWITCHMODEAPPEND:
	case MODEKEYEDIT_CURSORRIGHT:
		if (c->prompt_index < size) {
			c->prompt_index++;
			c->flags |= CLIENT_STATUS;
		}
		break;
	case MODEKEYEDIT_STARTOFLINE:
		if (c->prompt_index != 0) {
			c->prompt_index = 0;
			c->flags |= CLIENT_STATUS;
		}
		break;
	case MODEKEYEDIT_ENDOFLINE:
		if (c->prompt_index != size) {
			c->prompt_index = size;
			c->flags |= CLIENT_STATUS;
		}
		break;
	case MODEKEYEDIT_COMPLETE:
		if (*c->prompt_buffer == '\0')
			break;

		idx = c->prompt_index;
		if (idx != 0)
			idx--;

		/* Find the word we are in. */
		first = c->prompt_buffer + idx;
		while (first > c->prompt_buffer && *first != ' ')
			first--;
		while (*first == ' ')
			first++;
		last = c->prompt_buffer + idx;
		while (*last != '\0' && *last != ' ')
			last++;
		while (*last == ' ')
			last--;
		if (*last != '\0')
			last++;
		if (last <= first ||
		    ((size_t) (last - first)) > (sizeof word) - 1)
			break;
		memcpy(word, first, last - first);
		word[last - first] = '\0';

		/* And try to complete it. */
		if ((s = status_prompt_complete(word)) == NULL)
			break;

		/* Trim out word. */
		n = size - (last - c->prompt_buffer) + 1; /* with \0 */
		memmove(first, last, n);
		size -= last - first;

		/* Insert the new word. */
 		size += strlen(s);
		off = first - c->prompt_buffer;
 		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 1);
		first = c->prompt_buffer + off;
 		memmove(first + strlen(s), first, n);
 		memcpy(first, s, strlen(s));

		c->prompt_index = (first - c->prompt_buffer) + strlen(s);
		xfree(s);

		c->flags |= CLIENT_STATUS;
		break;
	case MODEKEYEDIT_BACKSPACE:
		if (c->prompt_index != 0) {
			if (c->prompt_index == size)
				c->prompt_buffer[--c->prompt_index] = '\0';
			else {
				memmove(c->prompt_buffer + c->prompt_index - 1,
				    c->prompt_buffer + c->prompt_index,
				    size + 1 - c->prompt_index);
				c->prompt_index--;
			}
			c->flags |= CLIENT_STATUS;
		}
		break;
 	case MODEKEYEDIT_DELETE:
		if (c->prompt_index != size) {
			memmove(c->prompt_buffer + c->prompt_index,
			    c->prompt_buffer + c->prompt_index + 1,
			    size + 1 - c->prompt_index);
			c->flags |= CLIENT_STATUS;
		}
		break;
	case MODEKEYEDIT_DELETELINE:
		*c->prompt_buffer = '\0';
		c->prompt_index = 0;
		c->flags |= CLIENT_STATUS;
		break;
	case MODEKEYEDIT_DELETETOENDOFLINE:
		if (c->prompt_index < size) {
			c->prompt_buffer[c->prompt_index] = '\0';
			c->flags |= CLIENT_STATUS;
		}
		break;
	case MODEKEYEDIT_HISTORYUP:
		if (ARRAY_LENGTH(&c->prompt_hdata) == 0)
			break;
	       	xfree(c->prompt_buffer);

		c->prompt_buffer = xstrdup(ARRAY_ITEM(&c->prompt_hdata,
		    ARRAY_LENGTH(&c->prompt_hdata) - 1 - c->prompt_hindex));
		if (c->prompt_hindex != ARRAY_LENGTH(&c->prompt_hdata) - 1)
			c->prompt_hindex++;

		c->prompt_index = strlen(c->prompt_buffer);
		c->flags |= CLIENT_STATUS;
		break;
	case MODEKEYEDIT_HISTORYDOWN:
		xfree(c->prompt_buffer);

		if (c->prompt_hindex != 0) {
			c->prompt_hindex--;
			c->prompt_buffer = xstrdup(ARRAY_ITEM(
			    &c->prompt_hdata, ARRAY_LENGTH(
			    &c->prompt_hdata) - 1 - c->prompt_hindex));
		} else
			c->prompt_buffer = xstrdup("");

		c->prompt_index = strlen(c->prompt_buffer);
		c->flags |= CLIENT_STATUS;
		break;
	case MODEKEYEDIT_PASTE:
		if ((pb = paste_get_top(&c->session->buffers)) == NULL)
			break;
		for (n = 0; n < pb->size; n++) {
			if (pb->data[n] < 32 || pb->data[n] == 127)
				break;
		}

		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + n + 1);
		if (c->prompt_index == size) {
			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
			c->prompt_index += n;
			c->prompt_buffer[c->prompt_index] = '\0';
		} else {
			memmove(c->prompt_buffer + c->prompt_index + n,
			    c->prompt_buffer + c->prompt_index,
			    size + 1 - c->prompt_index);
			memcpy(c->prompt_buffer + c->prompt_index, pb->data, n);
			c->prompt_index += n;
		}

		c->flags |= CLIENT_STATUS;
		break;
	case MODEKEYEDIT_TRANSPOSECHARS:
		idx = c->prompt_index;
		if (idx < size)
			idx++;
		if (idx >= 2) {
			swapc = c->prompt_buffer[idx - 2];
			c->prompt_buffer[idx - 2] = c->prompt_buffer[idx - 1];
			c->prompt_buffer[idx - 1] = swapc;
			c->prompt_index = idx;
			c->flags |= CLIENT_STATUS;
		}
		break;
 	case MODEKEYEDIT_ENTER:
		if (*c->prompt_buffer != '\0')
			status_prompt_add_history(c);
		if (c->prompt_callbackfn(c->prompt_data, c->prompt_buffer) == 0)
			status_prompt_clear(c);
		break;
	case MODEKEYEDIT_CANCEL:
		if (c->prompt_callbackfn(c->prompt_data, NULL) == 0)
			status_prompt_clear(c);
		break;
	case MODEKEY_OTHER:
		if (key < 32 || key == 127)
			break;
		c->prompt_buffer = xrealloc(c->prompt_buffer, 1, size + 2);

		if (c->prompt_index == size) {
			c->prompt_buffer[c->prompt_index++] = key;
			c->prompt_buffer[c->prompt_index] = '\0';
		} else {
			memmove(c->prompt_buffer + c->prompt_index + 1,
			    c->prompt_buffer + c->prompt_index,
			    size + 1 - c->prompt_index);
			c->prompt_buffer[c->prompt_index++] = key;
		}

		if (c->prompt_flags & PROMPT_SINGLE) {
			if (c->prompt_callbackfn(
			    c->prompt_data, c->prompt_buffer) == 0)
				status_prompt_clear(c);
		}

		c->flags |= CLIENT_STATUS;
		break;
	default:
		break;
	}
}

/* Add line to the history. */
void
status_prompt_add_history(struct client *c)
{
	if (ARRAY_LENGTH(&c->prompt_hdata) > 0 &&
	    strcmp(ARRAY_LAST(&c->prompt_hdata), c->prompt_buffer) == 0)
		return;

	if (ARRAY_LENGTH(&c->prompt_hdata) == PROMPT_HISTORY) {
		xfree(ARRAY_FIRST(&c->prompt_hdata));
		ARRAY_REMOVE(&c->prompt_hdata, 0);
	}

	ARRAY_ADD(&c->prompt_hdata, xstrdup(c->prompt_buffer));
}

/* Complete word. */
char *
status_prompt_complete(const char *s)
{
	const struct cmd_entry 	      **cmdent;
	const struct set_option_entry  *optent;
	ARRAY_DECL(, const char *)	list;
	char			       *prefix, *s2;
	u_int				i;
	size_t			 	j;

	if (*s == '\0')
		return (NULL);

	/* First, build a list of all the possible matches. */
	ARRAY_INIT(&list);
	for (cmdent = cmd_table; *cmdent != NULL; cmdent++) {
		if (strncmp((*cmdent)->name, s, strlen(s)) == 0)
			ARRAY_ADD(&list, (*cmdent)->name);
	}
	for (optent = set_option_table; optent->name != NULL; optent++) {
		if (strncmp(optent->name, s, strlen(s)) == 0)
			ARRAY_ADD(&list, optent->name);
	}
	for (optent = set_window_option_table; optent->name != NULL; optent++) {
		if (strncmp(optent->name, s, strlen(s)) == 0)
			ARRAY_ADD(&list, optent->name);
	}

	/* If none, bail now. */
	if (ARRAY_LENGTH(&list) == 0) {
		ARRAY_FREE(&list);
		return (NULL);
	}

	/* If an exact match, return it, with a trailing space. */
	if (ARRAY_LENGTH(&list) == 1) {
		xasprintf(&s2, "%s ", ARRAY_FIRST(&list));
		ARRAY_FREE(&list);
		return (s2);
	}

	/* Now loop through the list and find the longest common prefix. */
	prefix = xstrdup(ARRAY_FIRST(&list));
	for (i = 1; i < ARRAY_LENGTH(&list); i++) {
		s = ARRAY_ITEM(&list, i);

		j = strlen(s);
		if (j > strlen(prefix))
			j = strlen(prefix);
		for (; j > 0; j--) {
			if (prefix[j - 1] != s[j - 1])
				prefix[j - 1] = '\0';
		}
	}

	ARRAY_FREE(&list);
	return (prefix);
}