linux-gpib-sys 0.1.1

FFI bind to Linux-GPIB library
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#[cfg(feature = "bindgen")]
use std::env;

#[cfg(any(not(docsrs), feature = "bindgen"))]
use std::path::PathBuf;

#[cfg(feature = "bindgen")]
fn find_include_dir() -> Option<&'static str> {
    const POSSIBLE_INCLUDE_DIR: [&'static str; 2] = ["/usr/include", "/usr/local/include"];
    for include_dir in POSSIBLE_INCLUDE_DIR {
        let header_dir = PathBuf::from(include_dir.to_owned());
        let mut header_file = header_dir.clone();
        header_file.push("gpib");
        header_file.push("ib.h");
        if header_file.exists() {
            return Some(include_dir);
        }
    }
    None
}

#[cfg(not(docsrs))]
fn find_library_dir() -> Option<&'static str> {
    const POSSIBLE_LIB_DIR: [&'static str; 2] = ["/usr/lib", "/usr/local/lib"];
    for library_dir in POSSIBLE_LIB_DIR {
        let library_dir_path = PathBuf::from(library_dir.to_owned());
        let mut library_file = library_dir_path.clone();
        library_file.push("libgpib.so");
        if library_file.exists() {
            return Some(library_dir);
        }
    }
    None
}

#[cfg(not(docsrs))]
fn add_lib() {
    let lib_dir = find_library_dir().expect("libgpib.so not found.");
    println!(r"cargo:rustc-link-search={lib_dir}");
    println!(r"cargo:rustc-link-lib=dylib=gpib");
}

#[cfg(feature = "bindgen")]
fn generate_bindings() {
    let include_dir = find_include_dir().expect("gpib/ib.h not found.");
    let bindings = bindgen::Builder::default()
        .header("headers/gpib.h")
        .clang_arg(format!("-I{}", include_dir))
        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
        .generate()
        .expect("Unable to generate bindings for gpib/ib.h");

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

fn main() {
    #[cfg(not(docsrs))]
    add_lib();
    #[cfg(feature = "bindgen")]
    generate_bindings();
}