Link PyGTK/Pycairo/PyQt/wxPython from system packages in virtual environment

postmkvirtualenv

#!/bin/bash
# This hook is run after a new virtualenv is activated.
#
# For use with virtualenvwrapper [1], based on [2].
#
# This script makes it possible to use PyGTK/Pycairo/PyQt/wxPython in Python
# virtual environments from the corresponding system packages. It is tested on
# Debian wheezy and Ubuntu 12.04.
#
# Copy this script to `~/.virtualenvs/postmkvirtualenv` (make it executable)
# and it will automatically be run after a new virtualenv is created. You can
# also run it yourself if the relevant virtual environment is activated.
#
# The following system packages should be installed:
# - python-qt4
# - libfreetype6-dev
# - libpng12-dev
# - python-cairo
# - python-gtk2
# - python-gtk2-dev
# - python-wxgtk2.8
#
# 2013, Martijn Vermaat <martijn@vermaat.name>
#
# [1] http://virtualenvwrapper.readthedocs.org/
# [2] https://gist.github.com/jlesquembre/2042882

set -o nounset
set -o errexit
set -o pipefail

libs=( PyQt4 sip.so glib gobject gtk-2.0 gtk-2.0-pysupport-compat.pth pygtk.pth cairo wx.pth wx-2.8-gtk2-unicode wxversion.py )

python_version=python$(python -c "import sys; print (str(sys.version_info[0])+'.'+str(sys.version_info[1]))")
var=( $(which -a $python_version) )

get_python_lib_cmd="from distutils.sysconfig import get_python_lib; print (get_python_lib())"
lib_virtualenv_path=$(python -c "$get_python_lib_cmd")
lib_system_path=$(${var[-1]} -c "$get_python_lib_cmd")

echo Virtual environment library path: $lib_virtualenv_path
echo System library path: $lib_system_path

for lib in ${libs[@]}
do
    if [ -e $lib_system_path/$lib ]; then
        ln -fs $lib_system_path/$lib $lib_virtualenv_path/$lib
        echo Linked to virtual environment: $lib_system_path/$lib
    else
        echo Could not find system package: $lib_system_path/$lib
    fi
done

# Unfortunately, Pycairo is not always installed in dist-packages.
if [ ! -e $lib_virtualenv_path/cairo ]; then
    cairo_path=$(dirname "$(locate 'cairo/__init__.py' | grep -m 1 $python_version)")
    if echo "$cairo_path" | grep -q cairo; then
        ln -fs $cairo_path $lib_virtualenv_path/cairo
        echo Linked to virtual environment from alternative location: $cairo_path
    fi
fi