DISP=""

get_display() {
	w -h | while read -r user tty screen REPLY; do
		case "$screen" in
		  *:*)
			echo "DISPLAY=$screen"
			echo "USER=$user"
			exit 0
			;;
		esac
	done
	return 1
}

check_display() {
	if test -z "$DISPLAY" -o -z "$USER"; then
		return 1
	else
		return 0
	fi
}