[email protected]

class PythonAT39 < Formula
  desc "Interpreted, interactive, object-oriented programming language"
  homepage "https://www.python.org/"
  # Keep in sync with python-tk@3.9.
  url "https://www.python.org/ftp/python/3.9.5/Python-3.9.5.tar.xz"
  sha256 "0c5a140665436ec3dbfbb79e2dfb6d192655f26ef4a29aeffcb6d1820d716d83"
  license "Python-2.0"

  livecheck do
    url "https://www.python.org/ftp/python/"
    regex(%r{href=.*?v?(3\.9(?:\.\d+)*)/?["' >]}i)
  end

  bottle do
    sha256 arm64_big_sur: "1bbe1682fa834dbd546107d642ece2fdb722839dd42e8ba0e17599b6a99ca81c"
    sha256 big_sur:       "316baac980aa0a3dac263d64de41c4f09b06945a3da1556549a68949a93e4484"
    sha256 catalina:      "5d79eedf91642b87bd25e7b791b941ce9aad4735fecd1bc59c9c7faab50cbca6"
    sha256 mojave:        "a8f5eefdfe8e5d0b9daea86a13a5be87501ce5c8b96c1be6f146c99dc00df660"
  end

  # setuptools remembers the build flags python is built with and uses them to
  # build packages later. Xcode-only systems need different flags.
  pour_bottle? only_if: :clt_installed

  depends_on "pkg-config" => :build
  depends_on "gdbm"
  depends_on "mpdecimal"
  depends_on "openssl@1.1"
  depends_on "readline"
  depends_on "sqlite"
  depends_on "xz"

  uses_from_macos "bzip2"
  uses_from_macos "expat"
  uses_from_macos "libffi"
  uses_from_macos "ncurses"
  uses_from_macos "unzip"
  uses_from_macos "zlib"

  skip_clean "bin/pip3", "bin/pip-3.4", "bin/pip-3.5", "bin/pip-3.6", "bin/pip-3.7", "bin/pip-3.8"
  skip_clean "bin/easy_install3", "bin/easy_install-3.4", "bin/easy_install-3.5", "bin/easy_install-3.6",
             "bin/easy_install-3.7", "bin/easy_install-3.8"

  link_overwrite "bin/2to3"
  link_overwrite "bin/idle3"
  link_overwrite "bin/pip3"
  link_overwrite "bin/pydoc3"
  link_overwrite "bin/python3"
  link_overwrite "bin/python3-config"
  link_overwrite "bin/wheel3"
  link_overwrite "share/man/man1/python3.1"
  link_overwrite "lib/pkgconfig/python3.pc"
  link_overwrite "lib/pkgconfig/python3-embed.pc"
  link_overwrite "Frameworks/Python.framework/Headers"
  link_overwrite "Frameworks/Python.framework/Python"
  link_overwrite "Frameworks/Python.framework/Resources"
  link_overwrite "Frameworks/Python.framework/Versions/Current"

  resource "setuptools" do
    url "https://files.pythonhosted.org/packages/f6/e9/19af16328705915233299f6f1f02db95899fb00c75ac9da4757aa1e5d1de/setuptools-56.0.0.tar.gz"
    sha256 "08a1c0f99455307c48690f00d5c2ac2c1ccfab04df00454fef854ec145b81302"
  end

  resource "pip" do
    url "https://files.pythonhosted.org/packages/94/b0/e10bdc8809c81796c80aa3644a8e3dc16594fb1bd68f5996929f26cad980/pip-21.1.1.tar.gz"
    sha256 "51ad01ddcd8de923533b01a870e7b987c2eb4d83b50b89e1bf102723ff9fed8b"
  end

  resource "wheel" do
    url "https://files.pythonhosted.org/packages/ed/46/e298a50dde405e1c202e316fa6a3015ff9288423661d7ea5e8f22f589071/wheel-0.36.2.tar.gz"
    sha256 "e11eefd162658ea59a60a0f6c7d493a7190ea4b9a85e335b33489d9f17e0245e"
  end

  # Link against libmpdec.so.3, update for mpdecimal.h symbol cleanup.
  patch do
    url "https://www.bytereef.org/contrib/decimal.diff"
    sha256 "b0716ba88a4061dcc8c9bdd1acc57f62884000d1f959075090bf2c05ffa28bf3"
  end

  def lib_cellar
    on_macos do
      return prefix/"Frameworks/Python.framework/Versions/#{version.major_minor}/lib/python#{version.major_minor}"
    end
    on_linux do
      return prefix/"lib/python#{version.major_minor}"
    end
  end

  def site_packages_cellar
    lib_cellar/"site-packages"
  end

  # The HOMEBREW_PREFIX location of site-packages.
  def site_packages
    HOMEBREW_PREFIX/"lib/python#{version.major_minor}/site-packages"
  end

  def install
    # Unset these so that installing pip and setuptools puts them where we want
    # and not into some other Python the user has installed.
    ENV["PYTHONHOME"] = nil
    ENV["PYTHONPATH"] = nil

    # Override the auto-detection in setup.py, which assumes a universal build.
    on_macos do
      ENV["PYTHON_DECIMAL_WITH_MACHINE"] = Hardware::CPU.arm? ? "uint128" : "x64"
    end

    # The --enable-optimization and --with-lto flags diverge from what upstream
    # python does for their macOS binary releases. They have chosen not to apply
    # these flags because they want one build that will work across many macOS
    # releases. Homebrew is not so constrained because the bottling
    # infrastructure specializes for each macOS major release.
    args = %W[
      --prefix=#{prefix}
      --enable-ipv6
      --datarootdir=#{share}
      --datadir=#{share}
      --without-ensurepip
      --enable-loadable-sqlite-extensions
      --with-openssl=#{Formula["openssl@1.1"].opt_prefix}
      --with-dbmliborder=gdbm:ndbm
      --enable-optimizations
      --with-lto
      --with-system-expat
      --with-system-ffi
      --with-system-libmpdec
    ]

    on_macos do
      args << "--enable-framework=#{frameworks}"
      args << "--with-dtrace"

      # Override LLVM_AR to be plain old system ar.
      # https://bugs.python.org/issue43109
      args << "LLVM_AR=/usr/bin/ar"
    end
    on_linux do
      args << "--enable-shared"
    end

    # Python re-uses flags when building native modules.
    # Since we don't want native modules prioritizing the brew
    # include path, we move them to [C|LD]FLAGS_NODIST.
    # Note: Changing CPPFLAGS causes issues with dbm, so we
    # leave it as-is.
    cflags         = []
    cflags_nodist  = ["-I#{HOMEBREW_PREFIX}/include"]
    ldflags        = []
    ldflags_nodist = ["-L#{HOMEBREW_PREFIX}/lib", "-Wl,-rpath,#{HOMEBREW_PREFIX}/lib"]
    cppflags       = ["-I#{HOMEBREW_PREFIX}/include"]

    if MacOS.sdk_path_if_needed
      # Help Python's build system (setuptools/pip) to build things on SDK-based systems
      # The setup.py looks at "-isysroot" to get the sysroot (and not at --sysroot)
      cflags  << "-isysroot #{MacOS.sdk_path}"
      ldflags << "-isysroot #{MacOS.sdk_path}"
    end
    # Avoid linking to libgcc https://mail.python.org/pipermail/python-dev/2012-February/116205.html
    args << "MACOSX_DEPLOYMENT_TARGET=#{MacOS.version}"

    # Disable _tkinter - this is built in a separate formula python-tk
    inreplace "setup.py", "DISABLED_MODULE_LIST = []", "DISABLED_MODULE_LIST = ['_tkinter']"

    # We want our readline! This is just to outsmart the detection code,
    # superenv makes cc always find includes/libs!
    inreplace "setup.py",
      "do_readline = self.compiler.find_library_file(self.lib_dirs, 'readline')",
      "do_readline = '#{Formula["readline"].opt_lib}/#{shared_library("libhistory")}'"

    inreplace "setup.py" do |s|
      s.gsub! "sqlite_setup_debug = False", "sqlite_setup_debug = True"
      s.gsub! "for d_ in self.inc_dirs + sqlite_inc_paths:",
              "for d_ in ['#{Formula["sqlite"].opt_include}']:"
    end

    on_linux do
      # Python's configure adds the system ncurses include entry to CPPFLAGS
      # when doing curses header check. The check may fail when there exists
      # a 32-bit system ncurses (conflicts with the brewed 64-bit one).
      # See https://github.com/Homebrew/linuxbrew-core/pull/22307#issuecomment-781896552
      # We want our ncurses! Override system ncurses includes!
      inreplace "configure",
        'CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"',
        "CPPFLAGS=\"$CPPFLAGS -I#{Formula["ncurses"].opt_include}\""
    end

    # Allow python modules to use ctypes.find_library to find homebrew's stuff
    # even if homebrew is not a /usr/local/lib. Try this with:
    # `brew install enchant && pip install pyenchant`
    inreplace "./Lib/ctypes/macholib/dyld.py" do |f|
      f.gsub! "DEFAULT_LIBRARY_FALLBACK = [",
              "DEFAULT_LIBRARY_FALLBACK = [ '#{HOMEBREW_PREFIX}/lib', '#{Formula["openssl@1.1"].opt_lib}',"
      f.gsub! "DEFAULT_FRAMEWORK_FALLBACK = [", "DEFAULT_FRAMEWORK_FALLBACK = [ '#{HOMEBREW_PREFIX}/Frameworks',"
    end

    args << "CFLAGS=#{cflags.join(" ")}" unless cflags.empty?
    args << "CFLAGS_NODIST=#{cflags_nodist.join(" ")}" unless cflags_nodist.empty?
    args << "LDFLAGS=#{ldflags.join(" ")}" unless ldflags.empty?
    args << "LDFLAGS_NODIST=#{ldflags_nodist.join(" ")}" unless ldflags_nodist.empty?
    args << "CPPFLAGS=#{cppflags.join(" ")}" unless cppflags.empty?

    system "./configure", *args
    system "make"

    ENV.deparallelize do
      # Tell Python not to install into /Applications (default for framework builds)
      system "make", "install", "PYTHONAPPSDIR=#{prefix}"
      on_macos do
        system "make", "frameworkinstallextras", "PYTHONAPPSDIR=#{pkgshare}"
      end
    end

    # Any .app get a " 3" attached, so it does not conflict with python 2.x.
    Dir.glob("#{prefix}/*.app") { |app| mv app, app.sub(/\.app$/, " 3.app") }

    on_macos do
      # Prevent third-party packages from building against fragile Cellar paths
      inreplace Dir[lib_cellar/"**/_sysconfigdata__darwin_darwin.py",
                    lib_cellar/"config*/Makefile",
                    frameworks/"Python.framework/Versions/3*/lib/pkgconfig/python-3.?.pc"],
                prefix, opt_prefix

      # Help third-party packages find the Python framework
      inreplace Dir[lib_cellar/"config*/Makefile"],
                /^LINKFORSHARED=(.*)PYTHONFRAMEWORKDIR(.*)/,
                "LINKFORSHARED=\\1PYTHONFRAMEWORKINSTALLDIR\\2"

      # Fix for https://github.com/Homebrew/homebrew-core/issues/21212
      inreplace Dir[lib_cellar/"**/_sysconfigdata__darwin_darwin.py"],
                %r{('LINKFORSHARED': .*?)'(Python.framework/Versions/3.\d+/Python)'}m,
                "\\1'#{opt_prefix}/Frameworks/\\2'"
    end

    on_linux do
      # Prevent third-party packages from building against fragile Cellar paths
      inreplace Dir[lib_cellar/"**/_sysconfigdata_*linux_x86_64-*.py",
                    lib_cellar/"config*/Makefile",
                    bin/"python#{version.major_minor}-config",
                    lib/"pkgconfig/python-3.?.pc"],
                prefix, opt_prefix

      inreplace bin/"python#{version.major_minor}-config",
                'prefix_real=$(installed_prefix "$0")',
                "prefix_real=#{opt_prefix}"
    end

    # Symlink the pkgconfig files into HOMEBREW_PREFIX so they're accessible.
    (lib/"pkgconfig").install_symlink Dir["#{frameworks}/Python.framework/Versions/#{version.major_minor}/lib/pkgconfig/*"]

    # Remove the site-packages that Python created in its Cellar.
    site_packages_cellar.rmtree

    # Prepare a wheel of wheel to install later.
    common_pip_args = %w[
      -v
      --no-deps
      --no-binary :all:
      --no-index
      --no-build-isolation
    ]
    whl_build = buildpath/"whl_build"
    system bin/"python3", "-m", "venv", whl_build
    resource("wheel").stage do
      system whl_build/"bin/pip3", "install", *common_pip_args, "."
      system whl_build/"bin/pip3", "wheel", *common_pip_args,
                                            "--wheel-dir=#{libexec}",
                                            "."
    end

    # Replace bundled setuptools/pip with our own.
    rm Dir["#{lib_cellar}/ensurepip/_bundled/{setuptools,pip}-*.whl"]
    %w[setuptools pip].each do |r|
      resource(r).stage do
        system whl_build/"bin/pip3", "wheel", *common_pip_args,
                                              "--wheel-dir=#{lib_cellar}/ensurepip/_bundled",
                                              "."
      end
    end

    # Patch ensurepip to bootstrap our updated versions of setuptools/pip
    inreplace lib_cellar/"ensurepip/__init__.py" do |s|
      s.gsub!(/_SETUPTOOLS_VERSION = .*/, "_SETUPTOOLS_VERSION = \"#{resource("setuptools").version}\"")
      s.gsub!(/_PIP_VERSION = .*/, "_PIP_VERSION = \"#{resource("pip").version}\"")
    end

    # Write out sitecustomize.py
    (lib_cellar/"sitecustomize.py").atomic_write(sitecustomize)

    # Install unversioned symlinks in libexec/bin.
    {
      "idle"          => "idle3",
      "pydoc"         => "pydoc3",
      "python"        => "python3",
      "python-config" => "python3-config",
    }.each do |unversioned_name, versioned_name|
      (libexec/"bin").install_symlink (bin/versioned_name).realpath => unversioned_name
    end
  end

  def post_install
    ENV.delete "PYTHONPATH"

    # Fix up the site-packages so that user-installed Python software survives
    # minor updates, such as going from 3.3.2 to 3.3.3:

    # Create a site-packages in HOMEBREW_PREFIX/lib/python#{version.major_minor}/site-packages
    site_packages.mkpath

    # Symlink the prefix site-packages into the cellar.
    site_packages_cellar.unlink if site_packages_cellar.exist?
    site_packages_cellar.parent.install_symlink site_packages

    # Remove old sitecustomize.py. Now stored in the cellar.
    rm_rf Dir["#{site_packages}/sitecustomize.py[co]"]

    # Remove old setuptools installations that may still fly around and be
    # listed in the easy_install.pth. This can break setuptools build with
    # zipimport.ZipImportError: bad local file header
    # setuptools-0.9.8-py3.3.egg
    rm_rf Dir["#{site_packages}/setuptools[-_.][0-9]*", "#{site_packages}/setuptools"]
    rm_rf Dir["#{site_packages}/distribute[-_.][0-9]*", "#{site_packages}/distribute"]
    rm_rf Dir["#{site_packages}/pip[-_.][0-9]*", "#{site_packages}/pip"]
    rm_rf Dir["#{site_packages}/wheel[-_.][0-9]*", "#{site_packages}/wheel"]

    system bin/"python3", "-m", "ensurepip"

    # Install desired versions of setuptools, pip, wheel using the version of
    # pip bootstrapped by ensurepip.
    # Note that while we replaced the ensurepip wheels, there's no guarantee
    # ensurepip actually used them, since other existing installations could
    # have been picked up (and we can't pass --ignore-installed).
    bundled = lib_cellar/"ensurepip/_bundled"
    system bin/"python3", "-m", "pip", "install", "-v",
           "--no-deps",
           "--no-index",
           "--upgrade",
           "--isolated",
           "--target=#{site_packages}",
           bundled/"setuptools-#{resource("setuptools").version}-py3-none-any.whl",
           bundled/"pip-#{resource("pip").version}-py3-none-any.whl",
           libexec/"wheel-#{resource("wheel").version}-py2.py3-none-any.whl"

    # pip install with --target flag will just place the bin folder into the
    # target, so move its contents into the appropriate location
    mv (site_packages/"bin").children, bin
    rmdir site_packages/"bin"

    rm_rf bin/"pip"
    mv bin/"wheel", bin/"wheel3"

    # Install unversioned symlinks in libexec/bin.
    {
      "pip"   => "pip3",
      "wheel" => "wheel3",
    }.each do |unversioned_name, versioned_name|
      (libexec/"bin").install_symlink (bin/versioned_name).realpath => unversioned_name
    end

    # post_install happens after link
    %W[pip3 wheel3 pip#{version.major_minor}].each do |e|
      (HOMEBREW_PREFIX/"bin").install_symlink bin/e
    end

    # Help distutils find brewed stuff when building extensions
    include_dirs = [HOMEBREW_PREFIX/"include", Formula["openssl@1.1"].opt_include,
                    Formula["sqlite"].opt_include]
    library_dirs = [HOMEBREW_PREFIX/"lib", Formula["openssl@1.1"].opt_lib,
                    Formula["sqlite"].opt_lib]

    cfg = lib_cellar/"distutils/distutils.cfg"

    cfg.atomic_write <<~EOS
      [install]
      prefix=#{HOMEBREW_PREFIX}
      [build_ext]
      include_dirs=#{include_dirs.join ":"}
      library_dirs=#{library_dirs.join ":"}
    EOS
  end

  def sitecustomize
    <<~EOS
      # This file is created by Homebrew and is executed on each python startup.
      # Don't print from here, or else python command line scripts may fail!
      # <https://docs.brew.sh/Homebrew-and-Python>
      import re
      import os
      import sys
      if sys.version_info[:2] != (#{version.major}, #{version.minor}):
          # This can only happen if the user has set the PYTHONPATH to a mismatching site-packages directory.
          # Every Python looks at the PYTHONPATH variable and we can't fix it here in sitecustomize.py,
          # because the PYTHONPATH is evaluated after the sitecustomize.py. Many modules (e.g. PyQt4) are
          # built only for a specific version of Python and will fail with cryptic error messages.
          # In the end this means: Don't set the PYTHONPATH permanently if you use different Python versions.
          exit('Your PYTHONPATH points to a site-packages dir for Python #{version.major_minor} but you are running Python ' +
               str(sys.version_info[0]) + '.' + str(sys.version_info[1]) + '!\\n     PYTHONPATH is currently: "' + str(os.environ['PYTHONPATH']) + '"\\n' +
               '     You should `unset PYTHONPATH` to fix this.')
      # Only do this for a brewed python:
      if os.path.realpath(sys.executable).startswith('#{rack}'):
          # Shuffle /Library site-packages to the end of sys.path
          library_site = '/Library/Python/#{version.major_minor}/site-packages'
          library_packages = [p for p in sys.path if p.startswith(library_site)]
          sys.path = [p for p in sys.path if not p.startswith(library_site)]
          # .pth files have already been processed so don't use addsitedir
          sys.path.extend(library_packages)
          # the Cellar site-packages is a symlink to the HOMEBREW_PREFIX
          # site_packages; prefer the shorter paths
          long_prefix = re.compile(r'#{rack}/[0-9\._abrc]+/Frameworks/Python\.framework/Versions/#{version.major_minor}/lib/python#{version.major_minor}/site-packages')
          sys.path = [long_prefix.sub('#{HOMEBREW_PREFIX/"lib/python#{version.major_minor}/site-packages"}', p) for p in sys.path]
          # Set the sys.executable to use the opt_prefix. Only do this if PYTHONEXECUTABLE is not
          # explicitly set and we are not in a virtualenv:
          if 'PYTHONEXECUTABLE' not in os.environ and sys.prefix == sys.base_prefix:
              sys.executable = sys._base_executable = '#{opt_bin}/python#{version.major_minor}'
      if 'PYTHONHOME' not in os.environ:
          cellar_prefix = re.compile(r'#{rack}/[0-9\._abrc]+/')
          if os.path.realpath(sys.base_prefix).startswith('#{rack}'):
              new_prefix = cellar_prefix.sub('#{opt_prefix}/', sys.base_prefix)
              if sys.prefix == sys.base_prefix:
                  sys.prefix = new_prefix
              sys.base_prefix = new_prefix
          if os.path.realpath(sys.base_exec_prefix).startswith('#{rack}'):
              new_exec_prefix = cellar_prefix.sub('#{opt_prefix}/', sys.base_exec_prefix)
              if sys.exec_prefix == sys.base_exec_prefix:
                  sys.exec_prefix = new_exec_prefix
              sys.base_exec_prefix = new_exec_prefix
      # Check for and add the python-tk prefix.
      tkinter_prefix = "#{HOMEBREW_PREFIX}/opt/python-tk@#{version.major_minor}/libexec"
      if os.path.isdir(tkinter_prefix):
          sys.path.append(tkinter_prefix)
    EOS
  end

  def caveats
    <<~EOS
      Python has been installed as
        #{HOMEBREW_PREFIX}/bin/python3

      Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
      `python3`, `python3-config`, `pip3` etc., respectively, have been installed into
        #{opt_libexec}/bin

      You can install Python packages with
        pip3 install <package>
      They will install into the site-package directory
        #{HOMEBREW_PREFIX/"lib/python#{version.major_minor}/site-packages"}

      tkinter is no longer included with this formula, but it is available separately:
        brew install python-tk@#{version.major_minor}

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

  test do
    # Check if sqlite is ok, because we build with --enable-loadable-sqlite-extensions
    # and it can occur that building sqlite silently fails if OSX's sqlite is used.
    system "#{bin}/python#{version.major_minor}", "-c", "import sqlite3"

    # check to see if we can create a venv
    system "#{bin}/python#{version.major_minor}", "-m", "venv", testpath/"myvenv"

    # Check if some other modules import. Then the linked libs are working.
    system "#{bin}/python#{version.major_minor}", "-c", "import _ctypes"
    system "#{bin}/python#{version.major_minor}", "-c", "import _decimal"
    system "#{bin}/python#{version.major_minor}", "-c", "import _gdbm"
    system "#{bin}/python#{version.major_minor}", "-c", "import pyexpat"
    system "#{bin}/python#{version.major_minor}", "-c", "import zlib"

    # tkinter is provided in a separate formula
    assert_match "ModuleNotFoundError: No module named '_tkinter'",
                 shell_output("#{bin}/python#{version.major_minor} -Sc 'import tkinter' 2>&1", 1)

    # Verify that the selected DBM interface works
    (testpath/"dbm_test.py").write <<~EOS
      import dbm

      with dbm.ndbm.open("test", "c") as db:
          db[b"foo \\xbd"] = b"bar \\xbd"
      with dbm.ndbm.open("test", "r") as db:
          assert list(db.keys()) == [b"foo \\xbd"]
          assert b"foo \\xbd" in db
          assert db[b"foo \\xbd"] == b"bar \\xbd"
    EOS
    system "#{bin}/python#{version.major_minor}", "dbm_test.py"

    system bin/"pip3", "list", "--format=columns"
  end
end