Macro nu::command

macro_rules! command {
    (
        Named { $export:tt $args:ident $body:block }
        Positional { $($number:tt)* }
        Rest {}
        CommandConfig {
            name: $config_name:tt,
            mandatory_positional: vec![ $($mandatory_positional:tt)* ],
            optional_positional: vec![ $($optional_positional:tt)* ],
            rest_positional: $rest_positional:tt,
            named: {
                $(
                    ($named_param:tt : $named_type:ty : $named_kind:tt)
                )*
            }
        }

        Function {
            $( ( $param_name:tt : $param_type:tt ) )*
        }

        Extract {
            $($extract:tt)*
        }
    ) => { ... };
    (
        Named { $export:tt $args:ident $body:block }
        Positional { $($positional_count:tt)* }
        Rest { -- $param_name:ident : Switch , $($rest:tt)* }
        CommandConfig {
            name: $config_name:tt,
            mandatory_positional: vec![ $($mandatory_positional:tt)* ],
            optional_positional: vec![ $($optional_positional:tt)* ],
            rest_positional: $rest_positional:tt,
            named: {
                $($config_named:tt)*
            }
        }
        Function {
            $($function:tt)*
        }
        Extract {
            $($extract:tt)*
        }
    ) => { ... };
    (
        Named { $export:tt $args:ident $body:block }
        Positional { $($positional_count:tt)* }
        Rest { -- $param_name:ident : $param_kind:ty , $($rest:tt)* }
        CommandConfig {
            name: $config_name:tt,
            mandatory_positional: vec![ $($mandatory_positional:tt)* ],
            optional_positional: vec![ $($optional_positional:tt)* ],
            rest_positional: $rest_positional:tt,
            named: {
                $($config_named:tt)*
            }
        }
        Function {
            $($function:tt)*
        }
        Extract {
            $($extract:tt)*
        }
    ) => { ... };
    (
        Named { $export:tt $args:ident $body:block }
        Positional { $($positional_count:tt)* }
        Rest { -- $param_name:ident ? : $param_kind:ty , $($rest:tt)* }
        CommandConfig {
            name: $config_name:tt,
            mandatory_positional: vec![ $($mandatory_positional:tt)* ],
            optional_positional: vec![ $($optional_positional:tt)* ],
            rest_positional: $rest_positional:tt,
            named: {
                $($config_named:tt)*
            }
        }
        Function {
            $($function:tt)*
        }
        Extract {
            $($extract:tt)*
        }
    ) => { ... };
    (
        Named { $export:ident $args:ident $body:block }
        Positional { $($positional_count:tt)* }
        Rest { $param_name:ident : Block , $($rest:tt)* }
        CommandConfig {
            name: $config_name:tt,
            mandatory_positional: vec![ $($mandatory_positional:tt)* ],
            optional_positional: vec![ $($optional_positional:tt)* ],
            rest_positional: $rest_positional:tt,
            named: {
                $($config_named:tt)*
            }
        }

        Function {
            $($function:tt)*
        }

        Extract {
            $($extract:tt)*
        }

    ) => { ... };
    (
        Named { $export:ident $args:ident $body:block }
        Positional { $($positional_count:tt)* }
        Rest { $param_name:ident : $param_kind:ty , $($rest:tt)* }
        CommandConfig {
            name: $config_name:tt,
            mandatory_positional: vec![ $($mandatory_positional:tt)* ],
            optional_positional: vec![ $($optional_positional:tt)* ],
            rest_positional: $rest_positional:tt,
            named: {
                $($config_named:tt)*
            }
        }

        Function {
            $($function:tt)*
        }

        Extract {
            $($extract:tt)*
        }

    ) => { ... };
    ($export:ident as $config_name:tt ( $args:ident , $($command_rest:tt)* ) $body:block) => { ... };
}