extern crate pkg_config;

use std::{env, fs, process};
use std::path::PathBuf;

macro_rules! cmd(($name:expr) => (process::Command::new($name)));
macro_rules! get(($name:expr) => (ok!(env::var($name))));
macro_rules! ok(($result:expr) => ($result.unwrap()));

macro_rules! run(
    ($command:expr) => (
        assert!(
            $command
                .stdout(process::Stdio::inherit())
                .stderr(process::Stdio::inherit())
                .status()
                .unwrap()
                .success()
        );
    );
);

fn main() {
    if pkg_config::find_library("mpg123").is_ok() {
        return;
    }
    let dynamic = env::var("CARGO_FEATURE_STATIC").is_err();
    let source = PathBuf::from(&get!("CARGO_MANIFEST_DIR")).join("source");
    let output = PathBuf::from(&get!("OUT_DIR"));
    let build = output.join("build");
    ok!(fs::create_dir_all(&build));
    run!(
        cmd!(source.join("configure"))
            .current_dir(&build)
            .arg(&format!(
                "--{}-shared",
                if dynamic { "enable" } else { "disable" },
            ))
            .arg(&format!(
                "--{}-static",
                if dynamic { "disable" } else { "enable" },
            ))
            .arg(&format!("--prefix={}", output.display()))
    );
    run!(cmd!("make").current_dir(&build).arg("install"));
    println!("cargo:root={}", output.display());
    println!(
        "cargo:rustc-link-lib={}=mpg123",
        if dynamic { "dylib" } else { "static" },
    );
    println!("cargo:rustc-link-search={}", output.join("lib").display());
}