tier 0.1.17

Rust configuration library for layered TOML, env, and CLI settings
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/// Hidden helper used by the `TierPatch` derive macro.
#[doc(hidden)]
#[must_use]
pub fn join_patch_prefix(prefix: &str, path: impl AsRef<str>) -> String {
    let path = path.as_ref();
    match (prefix.is_empty(), path.is_empty()) {
        (true, true) => String::new(),
        (true, false) => path.to_owned(),
        (false, true) => prefix.to_owned(),
        (false, false) => format!("{prefix}.{path}"),
    }
}