aga8 0.6.0

AGA8 and GERG2008 equations of state
Documentation 
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use cbindgen::{Config, Language};
use std::env;
use std::path::PathBuf;

fn main() {
    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
    let package_name = env::var("CARGO_PKG_NAME").unwrap();
    let output_file = target_dir()
        .join(format!("{}.h", package_name))
        .display()
        .to_string();
    let config = Config {
        autogen_warning: Some(String::from("// Autogenerated header file")),
        namespace: Some(String::from("ffi")),
        language: Language::C,
        documentation: false,
        include_version: true,
        package_version: true,
        pragma_once: true,
        ..Default::default()
    };

    cbindgen::generate_with_config(crate_dir, config)
        .unwrap()
        .write_to_file(output_file);

    if cfg!(target_os = "windows") {
        let mut res = winres::WindowsResource::new();

        if let Some(version) = retrieve_app_version_from_git_repository() {
            res.set("ProductVersion", &version);
        }

        res.compile().unwrap();
    }
}

fn target_dir() -> PathBuf {
    if let Ok(target) = env::var("CARGO_TARGET_DIR") {
        PathBuf::from(target)
    } else {
        PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()).join("target")
    }
}

fn retrieve_app_version_from_git_repository() -> Option<String> {
    { std::process::Command::new("git").args(["describe", "--tags", "--dirty"]) }
        .output()
        .ok()
        .filter(|o| o.status.success())
        .map(|o| String::from_utf8_lossy(&o.stdout).trim().to_owned())
}