homebrew-core/Formula/pypy.rb

class Pypy < Formula
  desc "Highly performant implementation of Python 2 in Python"
  homepage "https://pypy.org/"
  url "https://downloads.python.org/pypy/pypy2.7-v7.3.3-src.tar.bz2"
  sha256 "f63488051ba877fd65840bf8d53822a9c6423d947839023b8720139f4b6e2336"
  license "MIT"
  head "https://foss.heptapod.net/pypy/pypy", using: :hg

  livecheck do
    url "https://downloads.python.org/pypy/"
    regex(/href=.*?pypy2(?:\.\d+)*[._-]v?(\d+(?:\.\d+)+)-src\.t/i)
  end

  bottle do
    sha256 catalina: "4765094da8561c9b9c0c5e96923f1cd0f089eca8afdc39eca817ec503441ef66"
    sha256 mojave:   "9034fe7056c1921c98e1d712202a87baf51b6da620d2ba32e2f071006e04a90f"
  end

  depends_on "pkg-config" => :build
  depends_on arch: :x86_64
  depends_on "gdbm"
  # pypy does not find system libffi, and its location cannot be given
  # as a build option
  depends_on "libffi" if DevelopmentTools.clang_build_version >= 1000
  depends_on "openssl@1.1"
  depends_on "sqlite"
  depends_on "tcl-tk"

  uses_from_macos "expat"
  uses_from_macos "libffi"
  uses_from_macos "unzip"
  uses_from_macos "zlib"

  resource "bootstrap" do
    url "https://downloads.python.org/pypy/pypy2.7-v7.3.2-osx64.tar.bz2"
    sha256 "10ca57050793923aea3808b9c8669cf53b7342c90c091244e9660bf797d397c7"
  end

  # > Setuptools as a project continues to support Python 2 with bugfixes and important features on Setuptools 44.x.
  # See https://setuptools.readthedocs.io/en/latest/python%202%20sunset.html#python-2-sunset
  resource "setuptools" do
    url "https://files.pythonhosted.org/packages/b2/40/4e00501c204b457f10fe410da0c97537214b2265247bc9a5bc6edd55b9e4/setuptools-44.1.1.zip"
    sha256 "c67aa55db532a0dadc4d2e20ba9961cbd3ccc84d544e9029699822542b5a476b"
  end

  resource "pip" do
    url "https://files.pythonhosted.org/packages/ca/1e/d91d7aae44d00cd5001957a1473e4e4b7d1d0f072d1af7c34b5899c9ccdf/pip-20.3.3.tar.gz"
    sha256 "79c1ac8a9dccbec8752761cb5a2df833224263ca661477a2a9ed03ddf4e0e3ba"
  end

  def install
    # Fix Xcode 12 implicit function declaration errors.
    ENV.append "CFLAGS", "-Wno-implicit-function-declaration"

    # See https://github.com/Homebrew/homebrew/issues/24364
    ENV["PYTHONPATH"] = ""
    ENV["PYPY_USESSION_DIR"] = buildpath

    resource("bootstrap").stage buildpath/"bootstrap"
    python = buildpath/"bootstrap/bin/pypy"

    cd "pypy/goal" do
      system python, buildpath/"rpython/bin/rpython",
             "-Ojit", "--shared", "--cc", ENV.cc, "--verbose",
             "--make-jobs", ENV.make_jobs, "targetpypystandalone.py"
    end

    libexec.mkpath
    cd "pypy/tool/release" do
      package_args = %w[--archive-name pypy --targetdir .]
      system python, "package.py", *package_args
      system "tar", "-C", libexec.to_s, "--strip-components", "1", "-xf", "pypy.tar.bz2"
    end

    (libexec/"lib").install libexec/"bin/#{shared_library("libpypy-c")}"
    MachO::Tools.change_install_name("#{libexec}/bin/pypy",
                                     "@rpath/libpypy-c.dylib",
                                     "#{libexec}/lib/libpypy-c.dylib")

    # The PyPy binary install instructions suggest installing somewhere
    # (like /opt) and symlinking in binaries as needed. Specifically,
    # we want to avoid putting PyPy's Python.h somewhere that configure
    # scripts will find it.
    bin.install_symlink libexec/"bin/pypy"
    lib.install_symlink libexec/"lib/#{shared_library("libpypy-c")}"
  end

  def post_install
    # Post-install, fix up the site-packages and install-scripts folders
    # so that user-installed Python software survives minor updates, such
    # as going from 1.7.0 to 1.7.1.

    # Create a site-packages in the prefix.
    prefix_site_packages.mkpath

    # Symlink the prefix site-packages into the cellar.
    unless (libexec/"site-packages").symlink?
      # fix the case where libexec/site-packages/site-packages was installed
      rm_rf libexec/"site-packages/site-packages"
      mv Dir[libexec/"site-packages/*"], prefix_site_packages
      rm_rf libexec/"site-packages"
    end
    libexec.install_symlink prefix_site_packages

    # Tell distutils-based installers where to put scripts
    scripts_folder.mkpath
    (distutils/"distutils.cfg").atomic_write <<~EOS
      [install]
      install-scripts=#{scripts_folder}
    EOS

    %w[setuptools pip].each do |pkg|
      resource(pkg).stage do
        system bin/"pypy", "-s", "setup.py", "--no-user-cfg", "install", "--force", "--verbose"
      end
    end

    # Symlinks to easy_install_pypy and pip_pypy
    bin.install_symlink scripts_folder/"easy_install" => "easy_install_pypy"
    bin.install_symlink scripts_folder/"pip" => "pip_pypy"

    # post_install happens after linking
    %w[easy_install_pypy pip_pypy].each { |e| (HOMEBREW_PREFIX/"bin").install_symlink bin/e }
  end

  def caveats
    <<~EOS
      A "distutils.cfg" has been written to:
        #{distutils}
      specifying the install-scripts folder as:
        #{scripts_folder}

      If you install Python packages via "pypy setup.py install", easy_install_pypy,
      or pip_pypy, any provided scripts will go into the install-scripts folder
      above, so you may want to add it to your PATH *after* #{HOMEBREW_PREFIX}/bin
      so you don't overwrite tools from CPython.

      Setuptools and pip have been installed, so you can use easy_install_pypy and
      pip_pypy.
      To update setuptools and pip between pypy releases, run:
          pip_pypy install --upgrade pip setuptools

      See: https://docs.brew.sh/Homebrew-and-Python
    EOS
  end

  # The HOMEBREW_PREFIX location of site-packages
  def prefix_site_packages
    HOMEBREW_PREFIX/"lib/pypy/site-packages"
  end

  # Where setuptools will install executable scripts
  def scripts_folder
    HOMEBREW_PREFIX/"share/pypy"
  end

  # The Cellar location of distutils
  def distutils
    libexec/"lib-python/2.7/distutils"
  end

  test do
    system bin/"pypy", "-c", "print('Hello, world!')"
    system bin/"pypy", "-c", "import time; time.clock()"
    system scripts_folder/"pip", "list"
  end
end