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use std::sync::OnceLock;
use config::Config;
fn config() -> &'static Config {
static CONFIG: OnceLock<Config> = OnceLock::new();
CONFIG.get_or_init(|| {
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"));
}
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