/// Generates the extrinsic's call field for a given module and call passed as &str
/// # Arguments
///
/// * 'node_metadata' - This crate's parsed node metadata as field of the API.
/// * 'pallet' - Pallet name as &str for which the call is composed.
/// * 'call_name' - Call name as &str
/// * 'args' - Optional sequence of arguments of the call. They are not checked against the metadata.
/// As of now the user needs to check himself that the correct arguments are supplied.
#[macro_export]
macro_rules! compose_call {
($node_metadata: expr, $pallet: expr, $call_name: expr $(, $args: expr) *) => {
        {
            let pallet_metadata = $node_metadata.pallet_by_name($pallet).unwrap();
            $crate::compose_call_for_pallet_metadata !(pallet_metadata, $call $(, ($args)) *);
        }
    };
}

/// Generates the extrinsic's call field for the given PalletMetadata
/// # Arguments
///
/// * 'pallet_metadata' - This crate's parsed pallet metadata as field of the API.
/// * 'call_name' - Call name as &str
/// * 'args' - Optional sequence of arguments of the call. They are not checked against the metadata.
/// As of now the user needs to check himself that the correct arguments are supplied.
#[macro_export]
macro_rules! compose_call_for_pallet_metadata {
($pallet_metadata: expr, $call_name: expr $(, $args: expr) *) => {
        {
            let call_index = pallet.call_variant_by_name($call_name).unwrap().index;
            ([pallet.index(), call_index as u8] $(, ($args)) *)
        }
    };
}