//! The build's identity, for the version it reports: `OXY_BUILD` when a release or
//! an install sets it (from `oxy describe`), else the heads a Flow job is
//! building, else "local build".
fn main() {
    println!("cargo:rerun-if-env-changed=OXY_BUILD");
    println!("cargo:rerun-if-env-changed=FLOW_HEADS");
    let build = std::env::var("OXY_BUILD")
        .ok()
        .map(|b| b.trim().to_string())
        .filter(|b| !b.is_empty())
        .or_else(|| {
            std::env::var("FLOW_HEADS")
                .ok()
                .and_then(|h| h.split('+').next().map(|x| format!("flow #{}", &x[..12.min(x.len())])))
                .filter(|b| b.len() > "flow #".len())
        })
        .unwrap_or_else(|| "local build".into());
    println!("cargo:rustc-env=OXY_BUILD_ID={build}");
    println!("cargo:rustc-env=OXY_VERSION_LONG={} ({build})", std::env::var("CARGO_PKG_VERSION").unwrap());
}