Confique: type-safe, layered configuration library

Confique is a rather light-weight library that helps with configuration management in a type-safe and DRY (don't repeat yourself) fashion.

Features:

• Type safe: the code using the config values does not need to parse strings or unwrap any Options. All values already have the correct type.
• Layered configuration: you can load from and then merge multiple sources of configuration.
• Load config values from:
  • Environment variables
  • Files: TOML & YAML
  • Anything with a serde Deserializer (built-in support for more formats coming soon)
• Based on serde: less code in confique (more light-weight) and access to a huge ecosystem of high quality parsers.
• Easily generate configuration "templates" to describe all available config values to your users.

Simple example

use std::path::PathBuf;
use confique::Config;


#[derive(Config)]
struct Conf {
    #[config(env = "EXAMPLE_APP_USERNAME")]
    username: String,

    #[config(env = "EXAMPLE_APP_BUFFER_SIZE", default = 4096)]
    buffer_size: u32,

    #[config(nested)]
    log: LogConf,
}

#[derive(Config)]
struct LogConf {
    #[config(default = true)]
    stdout: bool,

    file: Option<PathBuf>,
}


let config = Conf::builder()
    .env()
    .file("example-app.toml")
    .file("/etc/example-app/config.toml")
    .load()?;

See the documentation for more information.

Status of this project

Confique is still a very young project. There are lots of features and improvements already planned. I'm developing this library alongside a web project that uses it.

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License

Licensed under either of Apache License, Version 2.0 or MIT license at your option. Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this project by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.