use std::process::Command;
use std::path::Path;
use std::process::exit;
use std::fs;
use std::env::vars;

fn main() {
    let opt = vars().find(|s| &s.0 == &"CARGO_HOME");
    let cargo_home = match opt {
        Some(home) => Path::new(&home.1).to_path_buf(),
        None => Path::new("~").join(".cargo"),
    };
    let clippy_path = cargo_home.join("rust-clippy");

    if clippy_path.exists() {
        Command::new("rm")
            .arg("-rf")
            .arg(&clippy_path)
            .output()
            .unwrap_or_else(|e| panic!("failed to remove rust-clippy: {}", e));
    }

    fs::DirBuilder::new().recursive(true).create(&clippy_path).unwrap();

    Command::new("git")
        .arg("clone")
        .arg("https://github.com/Manishearth/rust-clippy.git")
        .arg(&clippy_path)
        .output()
        .unwrap_or_else(|e| panic!("failed to clone: {}", e));

    let mut child = Command::new("cargo")
                        .arg("build")
                        .arg("--release")
                        .current_dir(&clippy_path)
                        .spawn()
                        .unwrap_or_else(|e| panic!("failed to build: {}", e));

    let exit_status = child.wait().unwrap_or_else(|e| panic!("{}", e));
    if let Some(code) = exit_status.code() {
        exit(code);
    }
}