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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-choose-session.c,v 1.8 2009/10/10 10:02:48 nicm Exp $ */

/*
 * Copyright (c) 2009 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 <ctype.h>

#include "tmux.h"

/*
 * Enter choice mode to choose a session.
 */

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

void	cmd_choose_session_callback(void *, int);
void	cmd_choose_session_free(void *);

const struct cmd_entry cmd_choose_session_entry = {
	"choose-session", NULL,
	CMD_TARGET_WINDOW_USAGE " [template]",
	CMD_ARG01, 0,
	cmd_target_init,
	cmd_target_parse,
	cmd_choose_session_exec,
	cmd_target_free,
	cmd_target_print
};

struct cmd_choose_session_data {
	struct client	*client;
	char   		*template;
};

int
cmd_choose_session_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_target_data		*data = self->data;
	struct cmd_choose_session_data	*cdata;
	struct winlink			*wl;
	struct session			*s;
	struct session_group		*sg;
	u_int			 	 i, idx, cur;
	char				 tmp[64];

	if (ctx->curclient == NULL) {
		ctx->error(ctx, "must be run interactively");
		return (-1);
	}

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

	if (window_pane_set_mode(wl->window->active, &window_choose_mode) != 0)
		return (0);

	cur = idx = 0;
	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
		s = ARRAY_ITEM(&sessions, i);
		if (s == NULL)
			continue;
		if (s == ctx->curclient->session)
			cur = idx;
		idx++;

		sg = session_group_find(s);
		if (sg == NULL)
			*tmp = '\0';
		else {
			idx = session_group_index(sg);
			xsnprintf(tmp, sizeof tmp, " (group %u)", idx);
		}

		window_choose_add(wl->window->active, i,
		    "%s: %u windows [%ux%u]%s%s", s->name,
		    winlink_count(&s->windows), s->sx, s->sy,
		    tmp, s->flags & SESSION_UNATTACHED ? "" : " (attached)");
	}

	cdata = xmalloc(sizeof *cdata);
	if (data->arg != NULL)
		cdata->template = xstrdup(data->arg);
	else
		cdata->template = xstrdup("switch-client -t '%%'");
	cdata->client = ctx->curclient;
	cdata->client->references++;

	window_choose_ready(wl->window->active,
	    cur, cmd_choose_session_callback, cmd_choose_session_free, cdata);

	return (0);
}

void
cmd_choose_session_callback(void *data, int idx)
{
	struct cmd_choose_session_data	*cdata = data;
	struct session			*s;
	struct cmd_list			*cmdlist;
	struct cmd_ctx			 ctx;
	char				*template, *cause;

	if (idx == -1)
		return;
	if (cdata->client->flags & CLIENT_DEAD)
		return;

	if ((u_int) idx > ARRAY_LENGTH(&sessions) - 1)
		return;
	s = ARRAY_ITEM(&sessions, idx);
	if (s == NULL)
		return;
	template = cmd_template_replace(cdata->template, s->name, 1);

	if (cmd_string_parse(template, &cmdlist, &cause) != 0) {
		if (cause != NULL) {
			*cause = toupper((u_char) *cause);
			status_message_set(cdata->client, "%s", cause);
			xfree(cause);
		}
		xfree(template);
		return;
	}
	xfree(template);

	ctx.msgdata = NULL;
	ctx.curclient = cdata->client;

	ctx.error = key_bindings_error;
	ctx.print = key_bindings_print;
	ctx.info = key_bindings_info;

	ctx.cmdclient = NULL;

	cmd_list_exec(cmdlist, &ctx);
	cmd_list_free(cmdlist);
}

void
cmd_choose_session_free(void *data)
{
	struct cmd_choose_session_data	*cdata = data;

	cdata->client->references--;
	xfree(cdata->template);
	xfree(cdata);
}