Added pip and setuptools formula

As discussed on IRC this simplifies the Python
packaging strategy of Homebrew. It's a modified
version of the hints given on http://bit.ly/HomebrewPython
and renders them unnecessary.

setuptools and pip will be installed separately
from Python's site-packages (e.g.
"#{prefix}/lib/pip") but will install other
packages in the Python's site-packages directory
and *not* inside their own directories.

In case the Python brew is removed or unlinked
all packages installed with pip will be removed
or unlinked, too. When using the non-framework
install of Python (e.g. not the OS X' default)
these restrictions also apply in case of the
installation of a new version of Python.

1 files changed, 27 insertions, 0 deletions

diff --git a/Library/Formula/setuptools.rb b/Library/Formula/setuptools.rb
new file mode 100644
index 000000000..0cb91342f
--- /dev/null
+++ b/Library/Formula/setuptools.rb
@@ -0,0 +1,27 @@
+require 'formula'
+
+class Setuptools <Formula
+  url 'http://pypi.python.org/packages/source/s/setuptools/setuptools-0.6c11.tar.gz'
+  homepage 'http://pypi.python.org/pypi/setuptools'
+  md5 '7df2a529a074f613b509fb44feefe74e'
+  version '0.6c11'
+
+  def install
+    dest=prefix+'lib/setuptools'
+    FileUtils.mkdir_p dest
+    ENV.append 'PYTHONPATH', dest, ":"
+    system "python", "setup.py", "install", "--prefix=#{prefix}", "--install-lib=#{dest}"
+
+    site_packages = `python -c "from distutils.sysconfig import get_python_lib; print get_python_lib()"`.chomp
+    pth = Pathname.new site_packages+'/homebrew.pth'
+    ohai "Writing #{pth} to enable setuptools"
+    data = DATA.read
+    data.sub! "HOMEBREW_SETUPTOOLS_PATH", dest
+    pth.unlink if pth.exist?
+    pth.write data
+  end
+end
+
+__END__
+# Please dont't modify this file, Homebrew will overwrite it.
+import site; site.addsitedir('HOMEBREW_SETUPTOOLS_PATH')