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Tap python2 as it's removed upstream.
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Homebrew/homebrew-core#49796
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@optix2000
optix2000 committed Feb 12, 2020
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class PythonAT2 < Formula
desc "Interpreted, interactive, object-oriented programming language"
homepage "https://www.python.org/"
url "https://www.python.org/ftp/python/2.7.17/Python-2.7.17.tar.xz"
sha256 "4d43f033cdbd0aa7b7023c81b0e986fd11e653b5248dac9144d508f11812ba41"
revision 1
head "https://github.com/python/cpython.git", :branch => "2.7"

# setuptools remembers the build flags python is built with and uses them to
# build packages later. Xcode-only systems need different flags.
pour_bottle? do
reason <<~EOS
The bottle needs the Apple Command Line Tools to be installed.
You can install them, if desired, with:
xcode-select --install
EOS
satisfy { MacOS::CLT.installed? }
end

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

resource "setuptools" do
url "https://files.pythonhosted.org/packages/f4/d5/a6c19dcbcbc267aca376558797f036d9bcdff344c9f785fe7d0fe9a5f2a7/setuptools-41.4.0.zip"
sha256 "7eae782ccf36b790c21bde7d86a4f303a441cd77036b25c559a602cf5186ce4d"
end

resource "pip" do
url "https://files.pythonhosted.org/packages/ce/ea/9b445176a65ae4ba22dce1d93e4b5fe182f953df71a145f557cffaffc1bf/pip-19.3.1.tar.gz"
sha256 "21207d76c1031e517668898a6b46a9fb1501c7a4710ef5dfd6a40ad9e6757ea7"
end

resource "wheel" do
url "https://files.pythonhosted.org/packages/59/b0/11710a598e1e148fb7cbf9220fd2a0b82c98e94efbdecb299cb25e7f0b39/wheel-0.33.6.tar.gz"
sha256 "10c9da68765315ed98850f8e048347c3eb06dd81822dc2ab1d4fde9dc9702646"
end

def lib_cellar
prefix/"Frameworks/Python.framework/Versions/2.7/lib/python2.7"
end

def site_packages_cellar
lib_cellar/"site-packages"
end

# The HOMEBREW_PREFIX location of site-packages.
def site_packages
HOMEBREW_PREFIX/"lib/python2.7/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

args = %W[
--prefix=#{prefix}
--enable-ipv6
--datarootdir=#{share}
--datadir=#{share}
--enable-framework=#{frameworks}
--without-ensurepip
]

# See upstream bug report from 22 Jan 2018 "Significant performance problems
# with Python 2.7 built with clang 3.x or 4.x"
# https://bugs.python.org/issue32616
# https://github.com/Homebrew/homebrew-core/issues/22743
if DevelopmentTools.clang_build_version >= 802 &&
DevelopmentTools.clang_build_version < 902
args << "--without-computed-gotos"
end

args << "--without-gcc" if ENV.compiler == :clang

cflags = []
ldflags = []
cppflags = []

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}" << "-I#{MacOS.sdk_path}/usr/include"
ldflags << "-isysroot #{MacOS.sdk_path}"
# For the Xlib.h, Python needs this header dir with the system Tk
# Yep, this needs the absolute path where zlib needed a path relative
# to the SDK.
cflags << "-I#{MacOS.sdk_path}/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers"
end

# Avoid linking to libgcc https://code.activestate.com/lists/python-dev/112195/
args << "MACOSX_DEPLOYMENT_TARGET=#{MacOS.version}"

# We want our readline and openssl! This is just to outsmart the detection code,
# superenv handles that cc finds includes/libs!
inreplace "setup.py" do |s|
s.gsub! "do_readline = self.compiler.find_library_file(lib_dirs, 'readline')",
"do_readline = '#{Formula["readline"].opt_lib}/libhistory.dylib'"
s.gsub! "/usr/local/ssl", Formula["openssl@1.1"].opt_prefix
end

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

# Allow sqlite3 module to load extensions:
# https://docs.python.org/library/sqlite3.html#f1
s.gsub! 'sqlite_defines.append(("SQLITE_OMIT_LOAD_EXTENSION", "1"))', ""
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',"
f.gsub! "DEFAULT_FRAMEWORK_FALLBACK = [", "DEFAULT_FRAMEWORK_FALLBACK = [ '#{HOMEBREW_PREFIX}/Frameworks',"
end

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

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

ENV.deparallelize do
# Tell Python not to install into /Applications
system "make", "install", "PYTHONAPPSDIR=#{prefix}"
system "make", "frameworkinstallextras", "PYTHONAPPSDIR=#{pkgshare}"
end

# Fixes setting Python build flags for certain software
# See: https://github.com/Homebrew/homebrew/pull/20182
# https://bugs.python.org/issue3588
inreplace lib_cellar/"config/Makefile" do |s|
s.change_make_var! "LINKFORSHARED",
"-u _PyMac_Error $(PYTHONFRAMEWORKINSTALLDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)"
end

# Prevent third-party packages from building against fragile Cellar paths
inreplace [lib_cellar/"_sysconfigdata.py",
lib_cellar/"config/Makefile",
frameworks/"Python.framework/Versions/Current/lib/pkgconfig/python-2.7.pc"],
prefix, opt_prefix

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

# Remove 2to3 because Python 3 also installs it
rm bin/"2to3"

# A fix, because python and python@2 both want to install Python.framework
# and therefore we can't link both into HOMEBREW_PREFIX/Frameworks
# https://github.com/Homebrew/homebrew/issues/15943
["Headers", "Python", "Resources"].each { |f| rm(prefix/"Frameworks/Python.framework/#{f}") }
rm prefix/"Frameworks/Python.framework/Versions/Current"

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

(libexec/"setuptools").install resource("setuptools")
(libexec/"pip").install resource("pip")
(libexec/"wheel").install resource("wheel")
end

def post_install
# Avoid conflicts with lingering unversioned files from Python 3
rm_f %W[
#{HOMEBREW_PREFIX}/bin/easy_install
#{HOMEBREW_PREFIX}/bin/pip
#{HOMEBREW_PREFIX}/bin/wheel
]

# Fix up the site-packages so that user-installed Python software survives
# minor updates, such as going from 2.7.0 to 2.7.1:

# Create a site-packages in HOMEBREW_PREFIX/lib/python2.7/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

# Write our sitecustomize.py
rm_rf Dir["#{site_packages}/sitecustomize.py[co]"]
(site_packages/"sitecustomize.py").atomic_write(sitecustomize)

# 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-0.9.5-py3.3.egg
rm_rf Dir["#{site_packages}/setuptools*"]
rm_rf Dir["#{site_packages}/distribute*"]
rm_rf Dir["#{site_packages}/pip[-_.][0-9]*", "#{site_packages}/pip"]

setup_args = ["-s", "setup.py", "--no-user-cfg", "install", "--force",
"--verbose",
"--single-version-externally-managed",
"--record=installed.txt",
"--install-scripts=#{bin}",
"--install-lib=#{site_packages}"]

(libexec/"setuptools").cd { system "#{bin}/python", *setup_args }
(libexec/"pip").cd { system "#{bin}/python", *setup_args }
(libexec/"wheel").cd { system "#{bin}/python", *setup_args }

# When building from source, these symlinks will not exist, since
# post_install happens after linking.
%w[pip pip2 pip2.7 easy_install easy_install-2.7 wheel].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[0] != 2:
# This can only happen if the user has set the PYTHONPATH for 3.x and run Python 2.x or vice versa.
# 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 2.x but you are running Python ' +
str(sys.version_info[0]) + '.x!\\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 and reject
# paths in /System pre-emptively (#14712)
library_site = '/Library/Python/2.7/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) and
not p.startswith('/System')]
# .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/2\.7/lib/python2\.7/site-packages')
sys.path = [long_prefix.sub('#{site_packages}', p) for p in sys.path]
# LINKFORSHARED (and python-config --ldflags) return the
# full path to the lib (yes, "Python" is actually the lib, not a
# dir) so that third-party software does not need to add the
# -F/#{HOMEBREW_PREFIX}/Frameworks switch.
try:
from _sysconfigdata import build_time_vars
build_time_vars['LINKFORSHARED'] = '-u _PyMac_Error #{opt_prefix}/Frameworks/Python.framework/Versions/2.7/Python'
except:
pass # remember: don't print here. Better to fail silently.
# Set the sys.executable to use the opt_prefix
sys.executable = '#{opt_bin}/python2.7'
EOS
end

def caveats; <<~EOS
Pip and setuptools have been installed. To update them
pip install --upgrade pip setuptools
You can install Python packages with
pip install <package>
They will install into the site-package directory
#{site_packages}
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", "-c", "import sqlite3"
# Check if some other modules import. Then the linked libs are working.
system "#{bin}/python", "-c", "import Tkinter; root = Tkinter.Tk()"
system "#{bin}/python", "-c", "import gdbm"
system "#{bin}/python", "-c", "import zlib"
system bin/"pip", "list", "--format=columns"
end
end

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