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Add "grouped sessions" which have independent name, options, current window and
so on but where the linked windows are synchronized (ie creating, killing
windows and so on are mirrored between the sessions). A grouped session may be
created by passing -t to new-session.

Had this around for a while, tested by a couple of people.

/* $OpenBSD: cmd-unlink-window.c,v 1.7 2009/10/10 10:02:48 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 "tmux.h"

/*
 * Unlink a window, unless it would be destroyed by doing so (only one link).
 */

int	cmd_unlink_window_exec(struct cmd *, struct cmd_ctx *);

const struct cmd_entry cmd_unlink_window_entry = {
	"unlink-window", "unlinkw",
	"[-k] " CMD_TARGET_WINDOW_USAGE,
	0, CMD_CHFLAG('k'),
	cmd_target_init,
	cmd_target_parse,
	cmd_unlink_window_exec,
	cmd_target_free,
	cmd_target_print
};

int
cmd_unlink_window_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_target_data	*data = self->data;
	struct winlink		*wl;
	struct window		*w;
	struct session		*s, *s2;
	struct session_group	*sg;
	u_int			 references;

	if ((wl = cmd_find_window(ctx, data->target, &s)) == NULL)
		return (-1);
	w = wl->window;

	sg = session_group_find(s);
	if (sg != NULL) {
		references = 0;
		TAILQ_FOREACH(s2, &sg->sessions, gentry)
			references++;
	} else
		references = 1;

	if (!(data->chflags & CMD_CHFLAG('k')) && w->references == references) {
		ctx->error(ctx, "window is only linked to one session");
		return (-1);
	}
	
	server_unlink_window(s, wl);
	recalculate_sizes();

	return (0);
}