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.

2 files changed, 65 insertions, 0 deletions

diff --git a/Library/Formula/pip.rb b/Library/Formula/pip.rb
new file mode 100644
index 000000000..10333afae
--- /dev/null
+++ b/Library/Formula/pip.rb
@@ -0,0 +1,38 @@
+require 'formula'
+
+class Pip <Formula
+  url 'http://pypi.python.org/packages/source/p/pip/pip-0.6.1.tar.gz'
+  homepage 'http://pip.openplans.org/'
+  md5 '7560e3055c66afb99ac4a7892389a237'
+
+  depends_on 'setuptools'
+
+  def install
+    dest = "#{prefix}/lib/pip"
+    system "python", "setup.py", "install", "--prefix=#{prefix}",
+                                            "--install-purelib=#{dest}"
+    # make sure we use the right python (distutils rewrites the shebang)
+    # also adds the pip lib path to the PYTHONPATH
+    script = DATA.read
+    script.sub! "HOMEBREW_PIP_PATH", dest
+    (bin+'pip').unlink
+    (bin+'pip').write script
+  end
+
+  def caveats
+    "pip installs packages. Python packages.\n"+
+    "Run 'pip help' to see a list of commands."
+  end
+end
+
+__END__
+#!/usr/bin/env python
+"""
+This is the Homebrew pip wrapper
+"""
+import sys
+sys.path.insert(0, 'HOMEBREW_PIP_PATH')
+from pip import main
+
+if __name__ == '__main__':
+    main()
\ No newline at end of file
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')