Sphinx directive raises exception with magic

[sontek]

If you try to use something like %matplotlib inline in sphinx with the ipython directive it raises the following exception:

Exception in /home/sontek/.virtualenvs/sontek_net/src/sontek_net/deploy/src/sontek_net/blog/2014/03/30/hello_world.rst at block ending on line 30
Specify :okexcept: as an option in the ipython:: block to suppress this message
---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)
<ipython-input-4-2b1da000a957> in <module>()
----> 1 get_ipython().magic(u'matplotlib inline')

/home/sontek/.virtualenvs/sontek_net/lib/python2.7/site-packages/IPython/core/interactiveshell.pyc in magic(self, arg_s)
   2203         magic_name, _, magic_arg_s = arg_s.partition(' ')
   2204         magic_name = magic_name.lstrip(prefilter.ESC_MAGIC)
-> 2205         return self.run_line_magic(magic_name, magic_arg_s)
   2206 
   2207     #-------------------------------------------------------------------------

/home/sontek/.virtualenvs/sontek_net/lib/python2.7/site-packages/IPython/core/interactiveshell.pyc in run_line_magic(self, magic_name, line)
   2124                 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
   2125             with self.builtin_trap:
-> 2126                 result = fn(*args,**kwargs)
   2127             return result
   2128 

/home/sontek/.virtualenvs/sontek_net/lib/python2.7/site-packages/IPython/core/magics/pylab.pyc in matplotlib(self, line)

/home/sontek/.virtualenvs/sontek_net/lib/python2.7/site-packages/IPython/core/magic.pyc in <lambda>(f, *a, **k)
    191     # but it's overkill for just that one bit of state.
    192     def magic_deco(arg):
--> 193         call = lambda f, *a, **k: f(*a, **k)
    194 
    195         if callable(arg):

/home/sontek/.virtualenvs/sontek_net/lib/python2.7/site-packages/IPython/core/magics/pylab.pyc in matplotlib(self, line)
     78         """
     79         args = magic_arguments.parse_argstring(self.matplotlib, line)
---> 80         gui, backend = self.shell.enable_matplotlib(args.gui)
     81         self._show_matplotlib_backend(args.gui, backend)
     82 

/home/sontek/.virtualenvs/sontek_net/lib/python2.7/site-packages/IPython/core/interactiveshell.pyc in enable_matplotlib(self, gui)
   2946         # Now we must activate the gui pylab wants to use, and fix %run to take
   2947         # plot updates into account
-> 2948         self.enable_gui(gui)
   2949         self.magics_manager.registry['ExecutionMagics'].default_runner = \
   2950             pt.mpl_runner(self.safe_execfile)

/home/sontek/.virtualenvs/sontek_net/lib/python2.7/site-packages/IPython/core/interactiveshell.pyc in enable_gui(self, gui)
   2905 
   2906     def enable_gui(self, gui=None):
-> 2907         raise NotImplementedError('Implement enable_gui in a subclass')
   2908     
   2909     def enable_matplotlib(self, gui=None):

NotImplementedError: Implement enable_gui in a subclass
numpy: 1.8.1
scipy: 0.14.0
matplotlib: 1.3.1
scikit-learn: 0.14.1
<<<-------------------------------------------------------------------------

This happens because the sphinx directive isn't actually using inheritance:
https://github.com/ipython/ipython/blob/master/IPython/sphinxext/ipython_directive.py#L297

You can add enable_gui to it via IP.enable_gui = lambda x: False and it makes everything pass but then you don't actually get inline matplotlib images either.