cbqn-sys 0.0.1

FFI bindings to CBQN
Documentation 
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use bindgen;
use fs_extra::dir;
use std::{env, fs, path::PathBuf, process::Command};

fn main() {
    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
    let cbqn_dir = out_dir.join("CBQN");

    dir::remove(&cbqn_dir).unwrap();

    // build.rs must not modify anything outside $OUT_DIR, so copying CBQN to there
    dir::copy("CBQN", &out_dir, &dir::CopyOptions::new())
        .expect("expected to copy CBQN to $OUT_DIR/CBQN");

    copy_bytecode(&cbqn_dir);

    let cbqn_build = Command::new("make")
        .arg("shared-o3")
        .arg("libcbqn.so")
        .current_dir(&cbqn_dir)
        .status()
        .expect("make");

    if !cbqn_build.success() {
        std::process::exit(1);
    }

    let bindings = bindgen::Builder::default()
        // The input header we would like to generate
        // bindings for.
        .header("CBQN/include/bqnffi.h")
        .allowlist_function("bqn_.*")
        // Tell cargo to invalidate the built crate whenever any of the
        // included header files changed.
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        // Finish the builder and generate the bindings.
        .generate()
        // Unwrap the Result and panic on failure.
        .expect("Unable to generate bindings");

    bindings
        .write_to_file(out_dir.join("bindings.rs"))
        .expect("Couldn't write bindings!");

    println!("cargo:rustc-link-search=native={}", cbqn_dir.display());
    println!("cargo:rustc-link-lib=cbqn");
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed=CBQN/include/bqnffi.h");
}

fn copy_bytecode(cbqn_dir: &PathBuf) {
    // Copy bytecode from the bytecode submodule to prevent build.rs needing
    // to be running git
    let bytecode = [
        "compiles",
        "formatter",
        "runtime0",
        "runtime1",
        "src",
        "explain",
    ];
    for bc in bytecode {
        let bc_file = PathBuf::from("src/gen").join(bc);
        let bc_path = PathBuf::from("CBQN_bytecode").join(&bc_file);
        fs::copy(&bc_path, cbqn_dir.join(bc_file)).expect("bytecode file copy");
    }
    fs::File::create(cbqn_dir.join("src/gen/customRuntime")).unwrap();
}