Method deserialize

src/project_config/interfaces.rs:81–107

(deserializer: D)

// directly supported by serde's untagged enums.
impl<'de> Deserialize<'de> for TargetCommand {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        #[derive(Deserialize)]
        #[serde(rename_all = "kebab-case")]
        struct RawTarget {
            exec: Option<String>,
            entrypoint: Option<String>,
        }

        let raw = RawTarget::deserialize(deserializer)?;
        Ok(match (raw.exec, raw.entrypoint) {
            (Some(exec), None) => TargetCommand::Exec { exec },
            (None, Some(entrypoint)) => TargetCommand::Entrypoint { entrypoint },
            (Some(_), Some(_)) => {
                return Err(serde::de::Error::custom(
                    "a target cannot have both `exec` and `entrypoint`",
                ));
            }
            (None, None) => {
                return Err(serde::de::Error::custom(
                    "a target must have either `exec` or `entrypoint`",
                ));
            }
        })
    }
}