scsys-config 0.3.2

common configuration routines and schemas used throughout the ecosystem
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/// create a macro to streamline the process of adding sources
///
/// ```rust
/// use scsys_config::{config, config_sources};
///
/// use config::builder::{ConfigBuilder, DefaultState};
///
/// let mut builder: ConfigBuilder<DefaultState> = ConfigBuilder::default();
///
/// builder = config_sources! {
///     builder {
///         config::File::with_name("config.toml").required(false),
///     }
/// };
/// ```
#[macro_export]
macro_rules! config_sources {
    ($builder:ident {$($source:expr),* $(,)?}) => {
        $crate::config_sources!(@impl $builder::<[$($source),*]>)
    };
    (@impl $builder:ident::<[$($source:expr),* $(,)?]>) => {
        $builder$(.add_source($source))*
    };
    (@file file($wd:expr).required($req:expr)) => {
        config::File::with_name($wd).required($req);
    };
}