tmux/status.c

/* $OpenBSD$ */

/*
 * 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_replace1(
	    struct client *, char **, char **, char *, size_t, int);
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, 1);
	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, 1);
	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);
}

/* Replace a single special sequence (prefixed by #). */
void
status_replace1(struct client *c,
    char **iptr, char **optr, char *out, size_t outsize, int jobsflag)
{
	struct session *s = c->session;
	struct winlink *wl = s->curw;
	char		ch, tmp[256], *ptr, *endptr, *freeptr;
	size_t		ptrlen;
	long		limit;

	errno = 0;
	limit = strtol(*iptr, &endptr, 10);
	if ((limit == 0 && errno != EINVAL) ||
	    (limit == LONG_MIN && errno != ERANGE) ||
	    (limit == LONG_MAX && errno != ERANGE) || 
	    limit != 0)
		*iptr = endptr;
	if (limit <= 0)
		limit = LONG_MAX;

	freeptr = NULL;

	switch (*(*iptr)++) {
	case '(':
		if (!jobsflag) {
			ch = ')';
			goto skip_to;
		}
		if ((ptr = status_job(c, iptr)) == NULL)
			return;
		freeptr = ptr;
		goto do_replace;
	case 'H':
		if (gethostname(tmp, sizeof tmp) != 0)
			fatal("gethostname failed");
		ptr = tmp;
		goto do_replace;
	case 'I':
		xsnprintf(tmp, sizeof tmp, "%d", wl->idx);
		ptr = tmp;
		goto do_replace;
	case 'P':
		xsnprintf(tmp, sizeof tmp, "%u",
		    window_pane_index(wl->window, wl->window->active));
		ptr = tmp;
		goto do_replace;
	case 'S':
		ptr = s->name;
		goto do_replace;
	case 'T':
		ptr = wl->window->active->base.title;
		goto do_replace;
	case 'W':
		ptr = wl->window->name;
		goto do_replace;
	case '[':
		/* 
		 * Embedded style, handled at display time. Leave present and
		 * skip input until ].
		 */
		ch = ']';
		goto skip_to;
	case '#':
		*(*optr++) = '#';
		break;
	}

	return;
	
do_replace:
	ptrlen = strlen(ptr);
	if ((size_t) limit < ptrlen)
		ptrlen = limit;

	if (*optr + ptrlen >= out + outsize - 1)
		return;
	while (ptrlen > 0 && *ptr != '\0') {
		*(*optr)++ = *ptr++;
		ptrlen--;
	}

	if (freeptr != NULL)
		xfree(freeptr);
	return;

skip_to:
	*(*optr)++ = '#';

	(*iptr)--;	/* include ch */
	while (**iptr != ch && **iptr != '\0') {
		if (*optr >=  out + outsize - 1)
			break;
		*(*optr)++ = *(*iptr)++;
	}
}

/* Replace special sequences in fmt. */
char *
status_replace(struct client *c, const char *fmt, time_t t, int jobsflag)
{
	static char	out[BUFSIZ];
	char		in[BUFSIZ], ch, *iptr, *optr;
	
	strftime(in, sizeof in, fmt, localtime(&t));
	in[(sizeof in) - 1] = '\0';

	iptr = in;
	optr = out;

	while (*iptr != '\0') {
		if (optr >= out + (sizeof out) - 1)
			break;
		ch = *iptr++;

		if (ch != '#') {
			*optr++ = ch;
			continue;
		}
		status_replace1(c, &iptr, &optr, out, sizeof out, jobsflag);
	}
	*optr = '\0';

	return (xstrdup(out));
}

/* Figure out job name and get its result, starting it off if necessary. */
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));
}

/* Job has finished: save its result. */
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);
}

/* Calculate winlink status line entry width. */
size_t
status_width(struct winlink *wl)
{
	return (xsnprintf(NULL, 0, "%d:%s ", wl->idx, wl->window->name));
}

/* Return winlink status line entry and adjust gc as necessary. */
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);
}

/* Set a status line message. */
void printflike2
status_message_set(struct client *c, const char *fmt, ...)
{
	struct timeval		 tv;
	struct session		*s = c->session;
	struct message_entry	*msg;
	va_list			 ap;
	int			 delay;
	u_int			 i, limit;

	status_prompt_clear(c);
	status_message_clear(c);

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

	ARRAY_EXPAND(&c->message_log, 1);
	msg = &ARRAY_LAST(&c->message_log);
	msg->msg_time = time(NULL);
	msg->msg = xstrdup(c->message_string);

	if (s == NULL)
		limit = 0;
	else
		limit = options_get_number(&s->options, "message-limit");
	for (i = ARRAY_LENGTH(&c->message_log); i > limit; i--) {
		msg = &ARRAY_ITEM(&c->message_log, i - 1);
		xfree(msg->msg);
		ARRAY_REMOVE(&c->message_log, i - 1);
	}

	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;
}

/* Clear status line message. */
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);
}

/* Clear status line message after timer expires. */
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);
}

/* Enable status line prompt. */
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;
}

/* Remove status line prompt. */
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);
}

/* Update status line prompt with a new prompt string. */
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);
}