class Mlton < Formula
  desc "Whole-program, optimizing compiler for Standard ML"
  homepage "http://mlton.org"
  head "https://github.com/MLton/mlton.git"

  stable do
    url "https://downloads.sourceforge.net/project/mlton/mlton/20130715/mlton-20130715.src.tgz"
    version "20130715"
    sha256 "215857ad11d44f8d94c27f75e74017aa44b2c9703304bcec9e38c20433143d6c"

    # Configure GMP location via Makefile (https://github.com/MLton/mlton/pull/136)
    patch do
      url "https://github.com/MLton/mlton/commit/6e79342cdcf2e15193d95fcd3a46d164b783aed4.diff?full_index=1"
      sha256 "7da7f0daf398fcb5b2c51db85721bd0d1979314f1b897a4eec4324f2a6d1b363"
    end
  end

  bottle do
    cellar :any
    sha256 "33373d7c0a3798f61df7617d896e5a57adad6c0fd5b0183acc55ce1fc6db1f76" => :high_sierra
    sha256 "cc534218ef56b8debc2c391821753433303698c3299a663ff0cac9af03f71ac5" => :sierra
    sha256 "97656e7b1533886252d034c4a6ac0391d386369598f36a72a0033df8bc54a339" => :el_capitan
    sha256 "96fb444b34e8a605445567482a480fb59be749f5f57f46bc704f44b4763f26ae" => :yosemite
    sha256 "fb9c2fbc7e1e0e975ef79a061d17d56b8300da5a60c4b347e6726966c30f8fc3" => :mavericks
  end

  depends_on "gmp"

  # The corresponding upstream binary release used to bootstrap.
  resource "bootstrap" do
    url "https://downloads.sourceforge.net/project/mlton/mlton/20130715/mlton-20130715-3.amd64-darwin.gmp-static.tgz"
    sha256 "7e865cd3d1e48ade3de9b7532a31e94af050ee45f38a2bc87b7b2c45ab91e8e1"
  end

  def install
    # Install the corresponding upstream binary release to 'bootstrap'.
    bootstrap = buildpath/"bootstrap"
    resource("bootstrap").stage do
      args = %W[
        WITH_GMP=#{Formula["gmp"].opt_prefix}
        PREFIX=#{bootstrap}
        MAN_PREFIX_EXTRA=/share
      ]
      system "make", *(args + ["install"])
    end
    ENV.prepend_path "PATH", bootstrap/"bin"

    # Support parallel builds (https://github.com/MLton/mlton/issues/132)
    ENV.deparallelize
    args = %W[
      WITH_GMP=#{Formula["gmp"].opt_prefix}
      DESTDIR=
      PREFIX=#{prefix}
      MAN_PREFIX_EXTRA=/share
    ]
    system "make", *(args + ["all-no-docs"])
    system "make", *(args + ["install-no-docs"])
  end

  test do
    (testpath/"hello.sml").write <<~'EOS'
      val () = print "Hello, Homebrew!\n"
    EOS
    system "#{bin}/mlton", "hello.sml"
    assert_equal "Hello, Homebrew!\n", `./hello`
  end
end