build.rs

use std::env;

mod release;

fn main() {
    for variable in ["GITHUB_RUN_NUMBER", "GITHUB_RUN_ATTEMPT", "GITHUB_SHA"] {
        println!("cargo:rerun-if-env-changed={variable}");
    }

    let package_version = env!("CARGO_PKG_VERSION");
    let release_codename = release::codename_for_version(package_version).unwrap_or_else(|| {
        panic!(
            "no release codename is configured for {package_version}; add the new major.minor release line to release.rs and update dist-workspace.toml"
        )
    });
    let run_number = env::var("GITHUB_RUN_NUMBER").ok();
    let run_attempt = env::var("GITHUB_RUN_ATTEMPT").ok();
    let sha = env::var("GITHUB_SHA").ok();
    let metadata = release::github_build_metadata(
        run_number.as_deref(),
        run_attempt.as_deref(),
        sha.as_deref(),
    );
    let version = metadata.map_or_else(
        || package_version.to_owned(),
        |metadata| format!("{package_version}+{metadata}"),
    );

    println!("cargo:rustc-env=RET2CLI_VERSION={version}");
    println!("cargo:rustc-env=RET2CLI_CODENAME={release_codename}");

    embed_windows_resources();
}

/// Embeds the PE resource section (version info + application icon) into
/// Windows builds.
///
/// The build script runs on the host, so the target OS has to be read from
/// `CARGO_CFG_TARGET_OS` at runtime; `cfg!(target_os)` would report the host
/// OS and silently skip resources when cross-compiling.
fn embed_windows_resources() {
    if env::var("CARGO_CFG_TARGET_OS").as_deref() != Ok("windows") {
        return;
    }
    println!("cargo:rerun-if-changed=assets/icon.ico");
    let mut resources = winresource::WindowsResource::new();
    resources
        .set_icon("assets/icon.ico")
        .compile()
        .unwrap_or_else(|err| panic!("failed to embed Windows PE resources: {err}"));
}