build.rs

// This [build.rs] is for setting Windows icons.
// The icon in [File Explorer] gets set here.
// The icon in the taskbar and top of the App window gets
// set in [src/main.rs, src/constants.rs] at runtime with
// pre-compiled bytes using [include_bytes!()] on the images in [images/].
#[cfg(windows)]
fn main() -> std::io::Result<()> {
    set_commit_env();

    static_vcruntime::metabuild();
    let mut res = winres::WindowsResource::new();
    // This sets the icon.
    res.set_icon("assets/images/icons/icon.ico");
    // This sets the [Run as Administrator] metadata flag for Windows.
    // Why do I do this?: [https://github.com/hinto-janai/gupax/tree/main/src#why-does-gupax-need-to-be-admin-on-windows]
    // TL;DR: Because Windows.
    res.set_manifest(
        r#"
	<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
		<trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
			<security>
				<requestedPrivileges>
					<requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
				</requestedPrivileges>
			</security>
		</trustInfo>
	</assembly>
	"#,
    );
    res.compile()
}

#[cfg(unix)]
fn main() {
    set_commit_env();
}

// Set the current git commit to the env var [COMMIT].
fn set_commit_env() {
    println!("cargo:rerun-if-changed=.git/refs/heads/");

    let output = std::process::Command::new("git")
        .args(["rev-parse", "HEAD"])
        .output()
        .unwrap();

    let commit = String::from_utf8(output.stdout).unwrap();

    assert!(commit.len() >= 40);

    println!("cargo:rustc-env=COMMIT={commit}");
}