examples/static_env.rs


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use config::Config;

lazy_static::lazy_static! {
    #[derive(Debug)]
    pub static ref CONFIG: Config = Config::builder()
        .add_source(config::Environment::with_prefix("APP_NAME").separator("_"))
        .build()
        .unwrap();
}

/// Get a configuration value from the static configuration object
pub fn get<'a, T: serde::Deserialize<'a>>(key: &str) -> T {
    // You shouldn't probably do it like that and actually handle that error that might happen
    // here, but for the sake of simplicity, we do it like this here
    CONFIG.get::<T>(key).unwrap()
}

fn main() {
    println!("{:?}", get::<String>("foo"));
}