mmd-anim-cli 0.2.0

CLI diagnostics and roundtrip tools for mmd-anim
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fn main() {
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed={}", git_path("HEAD"));
    println!("cargo:rerun-if-changed={}", git_path("index"));

    let rustc_version = std::process::Command::new("rustc")
        .arg("--version")
        .output()
        .ok()
        .filter(|output| output.status.success())
        .and_then(|output| String::from_utf8(output.stdout).ok())
        .map(|version| version.trim().to_string())
        .unwrap_or_else(|| "unknown".to_string());
    println!("cargo:rustc-env=MMD_ANIM_CLI_RUSTC_VERSION={rustc_version}");

    let build_target = std::env::var("TARGET").unwrap_or_else(|_| "unknown".to_string());
    println!("cargo:rustc-env=MMD_ANIM_CLI_BUILD_TARGET={build_target}");

    let git_commit = std::process::Command::new("git")
        .args(["rev-parse", "--short", "HEAD"])
        .output()
        .ok()
        .filter(|output| output.status.success())
        .and_then(|output| String::from_utf8(output.stdout).ok())
        .map(|commit| commit.trim().to_string())
        .filter(|commit| !commit.is_empty())
        .unwrap_or_else(|| "unknown".to_string());
    println!("cargo:rustc-env=MMD_ANIM_CLI_GIT_COMMIT={git_commit}");
}

fn git_path(path: &str) -> String {
    std::process::Command::new("git")
        .args(["rev-parse", "--git-path", path])
        .output()
        .ok()
        .filter(|output| output.status.success())
        .and_then(|output| String::from_utf8(output.stdout).ok())
        .map(|value| value.trim().to_string())
        .filter(|value| !value.is_empty())
        .unwrap_or_else(|| format!(".git/{path}"))
}