leapcpp-sys 0.1.0

FFI bindings to the Leap Motion SDK 2.3.1
Documentation
use std::env;

fn main() {
    println!("cargo:rustc-link-lib=Leap");
    println!("cargo:rerun-if-changed=wrapper.hpp");
    println!("cargo:rerun-if-changed=wrapper.cpp");
    println!("cargo:rerun-if-env-changed=LEAPCPP_REGEN");
    println!("cargo:rerun-if-env-changed=LEAPCPP_NO_LINK");
    println!("cargo:rerun-if-env-changed=DOCS_RS");

    // docs.rs does not have the Leap SDK installed (of course), but we only need it for linking.
    if env::var_os("DOCS_RS").is_none() && env::var_os("LEAPCPP_NO_LINK").is_none() {
        // Compile and link against our wrapper
        cc::Build::new()
            .cpp(true)
            .file("wrapper.cpp")
            .compile("LeapRust");
    }

    #[cfg(feature = "regen")]
    if env::var_os("LEAPCPP_REGEN").is_some() {
        regenerate_bindings();
    }
}

#[cfg(feature = "regen")]
fn regenerate_bindings() {
    use std::path::PathBuf;

    // The bindgen::Builder is the main entry point
    // to bindgen, and lets you build up options for
    // the resulting bindings.
    let bindings = bindgen::Builder::default()
        // The input header we would like to generate
        // bindings for.
        .header("wrapper.hpp")
        // Tell cargo to invalidate the built crate whenever any of the
        // included header files changed.
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        .allowlist_function("Leap.*")
        .allowlist_type("Leap.*")
        .allowlist_var("Leap.*")
        .opaque_type("std::.*")
        // Finish the builder and generate the bindings.
        .generate()
        // Unwrap the Result and panic on failure.
        .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!");*/

    let out_path = PathBuf::from("./src");
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings!");
}