use std::process::Command;

/// Exposes the current commit and the crate name to the code through `env!()`
fn main() {
    let git_hash = Command::new("git")
        .args(["rev-parse", "HEAD"])
        .output()
        .ok()
        .filter(|output| output.status.success())
        .and_then(|output| String::from_utf8(output.stdout).ok())
        .map(|hash| hash.trim().chars().take(8).collect::<String>())
        .unwrap_or_else(|| "unknown".to_owned());

    println!("cargo:rustc-env=GIT_HASH={git_hash}");
    println!(
        "cargo:rustc-env=CRATE_NAME={}",
        env!("CARGO_PKG_NAME").replace("-", "_")
    );
    println!("cargo:rerun-if-changed=.git/HEAD");
}