use std::{env, path::PathBuf};

fn main() {
    generate_dispatch_bindings();
}

fn generate_dispatch_bindings() {
    println!("cargo:rustc-link-lib=framework=System");
    println!("cargo:rerun-if-changed=src/platform/mac/dispatch.h");

    let bindings = bindgen::Builder::default()
        .header("src/platform/mac/dispatch.h")
        .allowlist_var("_dispatch_main_q")
        .allowlist_function("dispatch_async_f")
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        .layout_tests(false)
        .generate()
        .expect("unable to generate bindings");

    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("dispatch_sys.rs"))
        .expect("couldn't write dispatch bindings");
}