//! What the rigs need and none of them should spell its own way. Every
//! fuzzer and measurement here is run by hand with its parameters in the
//! environment, so one reader is shared rather than copied into each target.

/// A rig's parameter from the environment, or its default. A switch is
/// `env("NAME", 0_u8) != 0`, so `NAME=1` turns it on.
pub fn env<T: std::str::FromStr>(name: &str, fallback: T) -> T {
    std::env::var(name)
        .ok()
        .and_then(|value| value.parse().ok())
        .unwrap_or(fallback)
}