Enum ConfigSource 

pub enum ConfigSource {
    Defaults,
    File(PathBuf),
    Env {
        prefix: Option<String>,
    },
}

Specifies where configuration values should be loaded from.

Sources are applied in order; later sources overwrite earlier values.

Variants

Defaults

Apply compile-time defaults declared with #[param(default = ...)].

File(PathBuf)

Read a TOML file at the given path.

Missing files are silently skipped (not an error) so that optional config files work without extra boilerplate.

Env

Read environment variables.

Each field is looked up under {PREFIX}_{FIELD_UPPER} (e.g. prefix "APP", field host → APP_HOST). An explicit #[param(env = "X")] overrides the generated name entirely.

prefix is uppercased automatically; None means no prefix.

Fields

prefix: Option<String>

Trait Implementations

impl Clone for ConfigSource

fn clone(&self) -> ConfigSource

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ConfigSource

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.