libquickjs-sys 0.5.0

QuickJS Javascript Engine FFI bindings
Documentation 
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use std::path::{Path, PathBuf};

use std::env;

fn exists(path: impl AsRef<Path>) -> bool {
    PathBuf::from(path.as_ref()).exists()
}

const LIB_NAME: &str = "quickjs";

#[cfg(all(not(feature = "system"), not(feature = "bundled")))]
fn main() {
    panic!("Invalid config for crate libquickjs-sys: must enable either the 'bundled' or the 'system' feature");
}

#[cfg(feature = "system")]
extern crate bindgen;

#[cfg(feature = "system")]
fn main() {
    #[cfg(not(feature = "bindgen"))]
    panic!("Invalid configuration for libquickjs-sys: Must either enable the bundled or the bindgen feature");

    #[cfg(feature = "patched")]
    panic!("Invalid configuration for libquickjs-sys: the patched feature is incompatible with the system feature");

    let lib = if cfg!(unix) {
        if exists(format!("/usr/lib/quickjs/{}.a", LIB_NAME)) {
            "/usr/lib/quickjs"
        } else if exists("/usr/local/lib/quickjs") {
            "/usr/local/lib/quickjs"
        } else {
            panic!("quickjs is not supported on this platform");
        }
    } else {
        panic!("quickjs error: Windows is not supported yet");
    };

    // Generate bindings.
    let bindings = bindgen::Builder::default()
        .header("wrapper.h")
        .generate()
        .expect("Unable to generate bindings");

    // Write the bindings to the $OUT_DIR/bindings.rs file.
    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings!");

    // Instruct cargo to statically link quickjs.
    println!("cargo:rustc-link-search=native={}", lib);
    println!("cargo:rustc-link-lib=static={}", LIB_NAME);
}

#[cfg(feature = "bundled")]
fn main() {
    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());

    let code_dir = out_path.join("quickjs");
    if exists(&code_dir) {
        std::fs::remove_dir_all(&code_dir).unwrap();
    }
    copy_dir::copy_dir("./embed/quickjs", &code_dir).expect("Could not copy quickjs directory");

    #[cfg(feature = "patched")]
    apply_patches(&code_dir);

    eprintln!("Compiling quickjs...");
    std::process::Command::new("make")
        .arg(format!("lib{}.a", LIB_NAME))
        .current_dir(&code_dir)
        .spawn()
        .expect("Could not compile quickjs")
        .wait()
        .expect("Could not compile quickjs");

    std::fs::copy("./embed/bindings.rs", out_path.join("bindings.rs"))
        .expect("Could not copy bindings.rs");

    // Instruct cargo to statically link quickjs.
    println!(
        "cargo:rustc-link-search=native={}",
        code_dir.to_str().unwrap()
    );
    println!("cargo:rustc-link-lib=static={}", LIB_NAME);
}

#[cfg(feature = "patched")]
fn apply_patches(code_dir: &PathBuf) {
    use std::fs;

    eprintln!("Applying patches...");
    for patch in fs::read_dir("./embed/patches").expect("Could not open patches directory") {
        let patch = patch.expect("Could not open patch");
        eprintln!("Applying {:?}...", patch.file_name());
        let status = std::process::Command::new("patch")
            .current_dir(&code_dir)
            .arg("-i")
            .arg(fs::canonicalize(patch.path()).expect("Cannot canonicalize patch path"))
            .spawn()
            .expect("Could not apply patches")
            .wait()
            .expect("Could not apply patches");
        assert!(
            status.success(),
            "Patch command returned non-zero exit code"
        );
    }
}