einstellung_derive 0.1.0

Proc-Macro crate for einstellung
Documentation 
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---
source: einstellung_derive/src/test.rs
expression: formatted
---
/// --- helper ---
pub fn validate_port(_: u16) -> Result<(), Box<dyn std::error::Error>> {
    Ok(())
}

// ---------------------------------

/// --- input ---
#[derive(Config)]
struct ServerConfig {
    #[config(validate = validate_port)]
    port: u16,
}

/// --- output ---
#[derive(::core::default::Default, ::einstellung::serde::Deserialize)]
#[serde(crate = "::einstellung::serde")]
struct ServerConfigPartial {
    port: Option<u16>,
}
impl ::einstellung::PartialConfig for ServerConfigPartial {
    type Complete = ServerConfig;
    fn merge(
        self,
        next: Self,
    ) -> ::core::result::Result<Self, ::einstellung::ConfigError> {
        ::core::result::Result::Ok(Self {
            port: next.port.or(self.port),
        })
    }
    fn build(
        self,
    ) -> ::core::result::Result<Self::Complete, ::einstellung::ConfigError> {
        let port: u16 = self
            .port
            .ok_or(
                ::einstellung::ConfigError::MissingField(
                    ::einstellung::FieldPath::new("ServerConfig", "port"),
                ),
            )?;
        let _: ::einstellung::ValidationFunction<u16, _> = validate_port;
        if let Err(e) = (validate_port)(&port) {
            return Err(::einstellung::ConfigError::Validation {
                field: ::einstellung::FieldPath::new("ServerConfig", "port"),
                #[allow(clippy::useless_conversion)]
                reason: e.into(),
            });
        }
        ::core::result::Result::Ok(ServerConfig { port })
    }
}
impl ::einstellung::Config for ServerConfig {
    type Partial = ServerConfigPartial;
}