class Cython < Formula
  desc "Compiler for writing C extensions for the Python language"
  homepage "http://cython.org"
  url "https://files.pythonhosted.org/packages/b3/ae/971d3b936a7ad10e65cb7672356cff156000c5132cf406cb0f4d7a980fd3/Cython-0.28.3.tar.gz"
  sha256 "1aae6d6e9858888144cea147eb5e677830f45faaff3d305d77378c3cba55f526"

  bottle do
    cellar :any_skip_relocation
    sha256 "a942fc13f6a14991b883f38f7bcd3d441fa40968ec1bb2a3401d659eb7642fd0" => :high_sierra
    sha256 "892f5a70ce50a4f05e4b4bd9711e17e735ed84fe4fbf499bf9372ab9214e6a0f" => :sierra
    sha256 "8adfdb82791386b0a2799787cb21b61082cbc0d7f5a94c0de3c0323d70d8233a" => :el_capitan
  end

  keg_only <<~EOS
    this formula is mainly used internally by other formulae.
    Users are advised to use `pip` to install cython
  EOS

  depends_on "python@2"

  def install
    ENV.prepend_create_path "PYTHONPATH", libexec/"lib/python2.7/site-packages"
    system "python", *Language::Python.setup_install_args(libexec)

    bin.install Dir[libexec/"bin/*"]
    bin.env_script_all_files(libexec/"bin", :PYTHONPATH => ENV["PYTHONPATH"])
  end

  test do
    ENV.prepend_path "PYTHONPATH", libexec/"lib/python2.7/site-packages"

    phrase = "You are using Homebrew"
    (testpath/"package_manager.pyx").write "print '#{phrase}'"
    (testpath/"setup.py").write <<~EOS
      from distutils.core import setup
      from Cython.Build import cythonize

      setup(
        ext_modules = cythonize("package_manager.pyx")
      )
    EOS
    system "python", "setup.py", "build_ext", "--inplace"
    assert_match phrase, shell_output("python -c 'import package_manager'")
  end
end