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macro_rules! register_events {
    (
        ($main_event_type_ident: ident, $main_event_ident: ident) {
            $(
                $current_event_type_ident: ident {
                    $current_event_none_ident: ident,
                    $current_event_input_ident: ident,
                    $current_event_output_ident: ident,
                    $current_event_input_output_ident: ident
                }
            ),+
        }
    ) => {
        pub enum $main_event_ident {
            $(
                $current_event_none_ident($current_event_none_ident),
                $current_event_input_ident($current_event_input_ident),
                $current_event_output_ident($current_event_output_ident),
                $current_event_input_output_ident($current_event_input_output_ident)
            ),+
        }

        impl $main_event_ident {
            pub fn new(funcs: Vec<Func>, event_type: $main_event_type_ident, has_input: bool, has_output: bool) -> Result<Self> {
                match event_type {
                    $(
                        $main_event_type_ident::$current_event_type_ident => {
                            let result =
                                if has_input {
                                    if has_output {
                                        let func = try!($current_event_input_output_ident::new(funcs));
                                        $main_event_ident::from(func)
                                    } else {
                                        let func = try!($current_event_input_ident::new(funcs));
                                        $main_event_ident::from(func)
                                    }
                                } else if has_output {
                                    let func = try!($current_event_output_ident::new(funcs));
                                    $main_event_ident::from(func)
                                } else {
                                    let func = try!($current_event_none_ident::new(funcs));
                                    $main_event_ident::from(func)
                                };
                            Ok(result)
                        }
                    ),+
                }
            }

            pub fn enum_to_string(&self) -> &'static str {
                match self {
                    $(
                        &$main_event_ident::$current_event_none_ident(_) => {
                            stringify!($main_event_ident::$current_event_none_ident)
                        },
                        &$main_event_ident::$current_event_input_ident(_) => {
                            stringify!($main_event_ident::$current_event_input_ident)
                        },
                        &$main_event_ident::$current_event_output_ident(_) => {
                            stringify!($main_event_ident::$current_event_output_ident)
                        },
                        &$main_event_ident::$current_event_input_output_ident(_) => {
                            stringify!($main_event_ident::$current_event_input_output_ident)
                        }
                    ),+
                }
            }
        }

        $(
            impl From<$current_event_none_ident> for $main_event_ident {
                fn from(event: $current_event_none_ident) -> $main_event_ident {
                    $main_event_ident::$current_event_none_ident(event)
                }
            }

            impl From<$current_event_input_ident> for $main_event_ident {
                fn from(event: $current_event_input_ident) -> $main_event_ident {
                    $main_event_ident::$current_event_input_ident(event)
                }
            }

            impl From<$current_event_output_ident> for $main_event_ident {
                fn from(event: $current_event_output_ident) -> $main_event_ident {
                    $main_event_ident::$current_event_output_ident(event)
                }
            }

            impl From<$current_event_input_output_ident> for $main_event_ident {
                fn from(event: $current_event_input_output_ident) -> $main_event_ident {
                    $main_event_ident::$current_event_input_output_ident(event)
                }
            }

            impl From<$main_event_ident> for Result<$current_event_none_ident> {
                fn from(event: $main_event_ident) -> Result<$current_event_none_ident> {
                    match event {
                        $main_event_ident::$current_event_none_ident(event) => Ok(event),
                        event => {
                            Err(
                                ErrorKind::EventConversionFailure(
                                    event.enum_to_string().to_string(),
                                    stringify!($main_event_ident::$current_event_none_ident).to_string(),
                                ).into()
                            )
                        },
                    }
                }
            }

            impl From<$main_event_ident> for Result<$current_event_input_ident> {
                fn from(event: $main_event_ident) -> Result<$current_event_input_ident> {
                    match event {
                        $main_event_ident::$current_event_input_ident(event) => Ok(event),
                        event => {
                            Err(
                                ErrorKind::EventConversionFailure(
                                    event.enum_to_string().to_string(),
                                    stringify!($main_event_ident::$current_event_input_ident).to_string(),
                                ).into()
                            )
                        },
                    }
                }
            }

            impl From<$main_event_ident> for Result<$current_event_output_ident> {
                fn from(event: $main_event_ident) -> Result<$current_event_output_ident> {
                    match event {
                        $main_event_ident::$current_event_output_ident(event) => Ok(event),
                        event => {
                            Err(
                                ErrorKind::EventConversionFailure(
                                    event.enum_to_string().to_string(),
                                    stringify!($main_event_ident::$current_event_output_ident).to_string(),
                                ).into()
                            )
                        },
                    }
                }
            }

            impl From<$main_event_ident> for Result<$current_event_input_output_ident> {
                fn from(event: $main_event_ident) -> Result<$current_event_input_output_ident> {
                    match event {
                        $main_event_ident::$current_event_input_output_ident(event) => Ok(event),
                        event => {
                            Err(
                                ErrorKind::EventConversionFailure(
                                    event.enum_to_string().to_string(),
                                    stringify!($main_event_ident::$current_event_input_output_ident).to_string(),
                                ).into()
                            )
                        },
                    }
                }
            }
        )+
    }
}