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A hierarchical configuration library so con-free, it's unreal.

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SergioBenitez/Figment

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Figment   ci.svg crates.io docs.rs

Figment is a semi-hierarchical configuration library for Rust so con-free, it's unreal.

use serde::Deserialize;

use figment::{Figment, providers::{Format, Toml, Json, Env}};

#[derive(Deserialize)]
struct Package {
    name: String,
    authors: Vec<String>,
    publish: Option<bool>,
    // ... and so on ...
}

#[derive(Deserialize)]
struct Config {
    package: Package,
    rustc: Option<String>,
    // ... and so on ...
}

let config: Config = Figment::new()
    .merge(Toml::file("Cargo.toml"))
    .merge(Env::prefixed("CARGO_"))
    .merge(Env::raw().only(&["RUSTC", "RUSTDOC"]))
    .join(Json::file("Cargo.json"))
    .extract()?;

See the documentation for a detailed usage guide and information.

Usage

Add the following to your Cargo.toml, enabling the desired built-in providers:

[dependencies]
figment = { version = "0.10", features = ["toml"] }

Third-Party Providers

The following external libraries implement Figment providers:

  • figment_file_provider_adapter

    Wraps existing providers. For any key ending in _FILE (configurable), emits a key without the _FILE suffix with a value corresponding to the contents of the file whose path is the original key's value.

Please submit a pull request to add your library to this list.

License

Figment is licensed under either of the following, at your option:

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A hierarchical configuration library so con-free, it's unreal.

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License

Apache-2.0, MIT licenses found

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Apache-2.0
LICENSE-APACHE
MIT
LICENSE-MIT

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