zonfig 0.1.0

A small dynamic configuration loader with file watching and hot reload support.
Documentation 
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use serde::Deserialize;

#[derive(Debug, Deserialize, PartialEq, Eq)]
struct AppConfig {
    host: String,
    port: u16,
}

#[test]
fn loads_json_yaml_and_toml() {
    let dir = tempfile::tempdir().expect("tempdir");

    let json = dir.path().join("app.json");
    let yaml = dir.path().join("app.yaml");
    let toml = dir.path().join("app.toml");

    std::fs::write(&json, r#"{"host":"127.0.0.1","port":8080}"#).expect("write json");
    std::fs::write(&yaml, "host: 127.0.0.1\nport: 8080\n").expect("write yaml");
    std::fs::write(&toml, "host = \"127.0.0.1\"\nport = 8080\n").expect("write toml");

    let expected = AppConfig {
        host: "127.0.0.1".to_owned(),
        port: 8080,
    };

    assert_eq!(
        zonfig::load::<AppConfig>(&json).expect("load json"),
        expected
    );
    assert_eq!(
        zonfig::load::<AppConfig>(&yaml).expect("load yaml"),
        expected
    );
    assert_eq!(
        zonfig::load::<AppConfig>(&toml).expect("load toml"),
        expected
    );
}

#[test]
fn can_load_with_explicit_format() {
    let dir = tempfile::tempdir().expect("tempdir");
    let path = dir.path().join("app.conf");

    std::fs::write(&path, r#"{"host":"localhost","port":3000}"#).expect("write config");

    let config = zonfig::load_with_format::<AppConfig>(&path, zonfig::Format::Json)
        .expect("load with format");

    assert_eq!(config.host, "localhost");
    assert_eq!(config.port, 3000);
}

#[test]
fn rejects_unknown_extensions() {
    let dir = tempfile::tempdir().expect("tempdir");
    let path = dir.path().join("app.conf");

    std::fs::write(&path, "host = \"localhost\"\nport = 3000\n").expect("write config");

    let error = zonfig::load::<AppConfig>(&path).expect_err("unknown format");
    assert!(matches!(error, zonfig::Error::UnknownFormat { .. }));
}