config 0.14.0

Layered configuration system for Rust applications.
Documentation 
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use config::{Config, File, FileFormat};

#[test]
fn test_set_override_scalar() {
    let config = Config::builder()
        .set_override("value", true)
        .and_then(|b| b.build())
        .unwrap();

    assert_eq!(config.get("value").ok(), Some(true));
}

#[cfg(feature = "toml")]
#[test]
fn test_set_scalar_default() {
    let config = Config::builder()
        .add_source(File::new("tests/Settings", FileFormat::Toml))
        .set_default("debug", false)
        .unwrap()
        .set_default("staging", false)
        .unwrap()
        .build()
        .unwrap();

    assert_eq!(config.get("debug").ok(), Some(true));
    assert_eq!(config.get("staging").ok(), Some(false));
}

#[cfg(feature = "toml")]
#[test]
fn test_set_scalar_path() {
    let config = Config::builder()
        .set_override("first.second.third", true)
        .unwrap()
        .add_source(File::new("tests/Settings", FileFormat::Toml))
        .set_default("place.favorite", true)
        .unwrap()
        .set_default("place.blocked", true)
        .unwrap()
        .build()
        .unwrap();

    assert_eq!(config.get("first.second.third").ok(), Some(true));
    assert_eq!(config.get("place.favorite").ok(), Some(false));
    assert_eq!(config.get("place.blocked").ok(), Some(true));
}

#[cfg(feature = "toml")]
#[test]
fn test_set_arr_path() {
    let config = Config::builder()
        .set_override("items[0].name", "Ivan")
        .unwrap()
        .set_override("data[0].things[1].name", "foo")
        .unwrap()
        .set_override("data[0].things[1].value", 42)
        .unwrap()
        .set_override("data[1]", 0)
        .unwrap()
        .add_source(File::new("tests/Settings", FileFormat::Toml))
        .set_override("items[2]", "George")
        .unwrap()
        .build()
        .unwrap();

    assert_eq!(config.get("items[0].name").ok(), Some("Ivan".to_string()));
    assert_eq!(
        config.get("data[0].things[1].name").ok(),
        Some("foo".to_string())
    );
    assert_eq!(config.get("data[0].things[1].value").ok(), Some(42));
    assert_eq!(config.get("data[1]").ok(), Some(0));
    assert_eq!(config.get("items[2]").ok(), Some("George".to_string()));
}

#[cfg(feature = "toml")]
#[test]
fn test_set_capital() {
    let config = Config::builder()
        .set_default("this", false)
        .unwrap()
        .set_override("ThAt", true)
        .unwrap()
        .add_source(File::from_str("{\"logLevel\": 5}", FileFormat::Json))
        .build()
        .unwrap();

    assert_eq!(config.get("this").ok(), Some(false));
    assert_eq!(config.get("ThAt").ok(), Some(true));
    assert_eq!(config.get("logLevel").ok(), Some(5));
}