extern crate rustc_version;
use rustc_version::{version, version_meta, Channel};
use std::borrow::Cow;

fn main() {
    // Assert we haven't travelled back in time
    assert!(version().unwrap().major >= 1);

    // Set cfg flags depending on release channel
    match version_meta().unwrap().channel {
        Channel::Stable => {
            println!("cargo:rustc-cfg=stable");
        }
        Channel::Beta => {
            println!("cargo:rustc-cfg=beta");
        }
        Channel::Nightly => {
            println!("cargo:rustc-cfg=nightly");
        }
        Channel::Dev => {
            println!("cargo:rustc-cfg=dev");
        }
    }

    // Link to GHOST and required stuffs
    println!(r"cargo:rustc-link-search=./lib");
    
    const LINK_TO: &[&'static str] =
	&["dylib=stdc++",	//libstdc++
	  "X11",		//X11
	  "OpenGL", "GL",       //OpenGL
	  "GLU", "GLX", "GLEW",  //GLEW
	  "spnav",
	  "Xxf86vm", "Xext",
	  "Xi", "Xrender", "Xfixes"
	];

    for link in LINK_TO.iter().map(|x| Cow::<'static, str>::Borrowed(x))
	.chain(std::fs::read_dir("./lib").unwrap().filter_map(|lib| lib.ok()
							      .map(|entry| entry.path().file_stem()
								   .map(|x| x.to_str()
									.map(|x| Cow::Owned((&x[3..]).to_owned())))
								   .flatten())
							      .flatten()))
    {
	println!("cargo:rustc-link-lib={}", link);
    }
}