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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: server-fn.c,v 1.25 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 <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

void
server_fill_environ(struct session *s, struct environ *env)
{
	char		 tmuxvar[MAXPATHLEN], *term;
	u_int		 idx;

	if (session_index(s, &idx) != 0)
		fatalx("session not found");
	xsnprintf(tmuxvar, sizeof tmuxvar,
	    "%s,%ld,%u", socket_path, (long) getpid(), idx);
	environ_set(env, "TMUX", tmuxvar);

	term = options_get_string(&s->options, "default-terminal");
	environ_set(env, "TERM", term);
}

void
server_write_error(struct client *c, const char *msg)
{
	struct msg_print_data	printdata;

	strlcpy(printdata.msg, msg, sizeof printdata.msg);
	server_write_client(c, MSG_ERROR, &printdata, sizeof printdata);
}

void
server_write_client(
    struct client *c, enum msgtype type, const void *buf, size_t len)
{
	struct imsgbuf	*ibuf = &c->ibuf;

	if (c->flags & CLIENT_BAD)
		return;
	log_debug("writing %d to client %d", type, c->ibuf.fd);
	imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, -1, (void *) buf, len);
}

void
server_write_session(
    struct session *s, enum msgtype type, const void *buf, size_t len)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session == s)
			server_write_client(c, type, buf, len);
	}
}

void
server_redraw_client(struct client *c)
{
	c->flags |= CLIENT_REDRAW;
}

void
server_status_client(struct client *c)
{
	c->flags |= CLIENT_STATUS;
}

void
server_redraw_session(struct session *s)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session == s)
			server_redraw_client(c);
	}
}

void
server_redraw_session_group(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_find(s)) == NULL)
		server_redraw_session(s);
	else {
		TAILQ_FOREACH(s, &sg->sessions, gentry)
			server_redraw_session(s);
	}
}

void
server_status_session(struct session *s)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session == s)
			server_status_client(c);
	}
}

void
server_status_session_group(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_find(s)) == NULL)
		server_status_session(s);
	else {
		TAILQ_FOREACH(s, &sg->sessions, gentry)
			server_status_session(s);
	}
}

void
server_redraw_window(struct window *w)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		if (c->session->curw->window == w)
			server_redraw_client(c);
	}
	w->flags |= WINDOW_REDRAW;
}

void
server_status_window(struct window *w)
{
	struct session	*s;
	u_int		 i;

	/*
	 * This is slightly different. We want to redraw the status line of any
	 * clients containing this window rather than any where it is the
	 * current window.
	 */

	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
		s = ARRAY_ITEM(&sessions, i);
		if (s != NULL && session_has(s, w))
			server_status_session(s);
	}
}

void
server_lock(void)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL)
			continue;
		server_lock_client(c);
	}
}

void
server_lock_session(struct session *s)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session == NULL || c->session != s)
			continue;
		server_lock_client(c);
	}	
}

void
server_lock_client(struct client *c)
{
	const char		*cmd;
	size_t			 cmdlen;
	struct msg_lock_data	 lockdata;

	if (c->flags & CLIENT_SUSPENDED)
		return;

	cmd = options_get_string(&c->session->options, "lock-command");
	cmdlen = strlcpy(lockdata.cmd, cmd, sizeof lockdata.cmd);
	if (cmdlen >= sizeof lockdata.cmd)
		return;
      
	tty_stop_tty(&c->tty);
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_SMCUP));
	tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_CLEAR));

	c->flags |= CLIENT_SUSPENDED;
	server_write_client(c, MSG_LOCK, &lockdata, sizeof lockdata);
}

void
server_kill_window(struct window *w)
{
	struct session	*s;
	struct winlink	*wl;
	u_int		 i;
	
	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
		s = ARRAY_ITEM(&sessions, i);
		if (s == NULL || !session_has(s, w))
			continue;
		if ((wl = winlink_find_by_window(&s->windows, w)) == NULL)
			continue;
		
		if (session_detach(s, wl))
			server_destroy_session_group(s);
		else {
			server_redraw_session(s);
			server_status_session_group(s);
		}
	}
}

int
server_link_window(struct session *src, struct winlink *srcwl,
    struct session *dst, int dstidx, int killflag, int selectflag, char **cause)
{
	struct winlink		*dstwl;
	struct session_group	*srcsg, *dstsg;

	srcsg = session_group_find(src);
	dstsg = session_group_find(dst);
	if (src != dst && srcsg != NULL && dstsg != NULL && srcsg == dstsg) {
		xasprintf(cause, "sessions are grouped");
		return (-1);
	}

	dstwl = NULL;
	if (dstidx != -1)
		dstwl = winlink_find_by_index(&dst->windows, dstidx);
	if (dstwl != NULL) {
		if (dstwl->window == srcwl->window)
			return (0);
		if (killflag) {
			/*
			 * Can't use session_detach as it will destroy session
			 * if this makes it empty.
			 */
			session_alert_cancel(dst, dstwl);
			winlink_stack_remove(&dst->lastw, dstwl);
			winlink_remove(&dst->windows, dstwl);

			/* Force select/redraw if current. */
			if (dstwl == dst->curw)
				selectflag = 1;
		}
	}

	if (dstidx == -1)
		dstidx = -1 - options_get_number(&dst->options, "base-index");
	dstwl = session_attach(dst, srcwl->window, dstidx, cause);
	if (dstwl == NULL)
		return (-1);

	if (selectflag)
		session_select(dst, dstwl->idx);
	server_redraw_session_group(dst);

	return (0);
}

void
server_unlink_window(struct session *s, struct winlink *wl)
{
	if (session_detach(s, wl))
		server_destroy_session_group(s);
	else
		server_redraw_session_group(s);
}

void
server_destroy_session_group(struct session *s)
{
	struct session_group	*sg;

	if ((sg = session_group_find(s)) == NULL)
		server_destroy_session(s);
	else {
		TAILQ_FOREACH(s, &sg->sessions, gentry)
			server_destroy_session(s);
		TAILQ_REMOVE(&session_groups, sg, entry);
		xfree(sg);
	}
}

void
server_destroy_session(struct session *s)
{
	struct client	*c;
	u_int		 i;
	
	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session != s)
			continue;
		c->session = NULL;
		server_write_client(c, MSG_EXIT, NULL, 0);
	}
}

void
server_set_identify(struct client *c)
{
	struct timeval	tv;
	int		delay;

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

	if (gettimeofday(&c->identify_timer, NULL) != 0)
		fatal("gettimeofday failed");
	timeradd(&c->identify_timer, &tv, &c->identify_timer);

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

void
server_clear_identify(struct client *c)
{
	if (c->flags & CLIENT_IDENTIFY) {
		c->flags &= ~CLIENT_IDENTIFY;
		c->tty.flags &= ~(TTY_FREEZE|TTY_NOCURSOR);
		server_redraw_client(c);
	}
}