use std::fs::File;
use std::io::Write;
use std::process::Command;
use std::str::from_utf8;

fn main() {
    let mut f = File::create("src/release.rs").expect("Can't create a file");

    let res = Command::new("rustc")
        .arg("--version")
        .output()
        .expect("Can't get rustc version");

    let version = from_utf8(&res.stdout).expect("Can't convert from utf-8");

    writeln!(f, r"pub static RUSTC_VERSION: &str = {:?};", version).expect("Can't write to a file");
}