[sphinx.ext.doctest] set language for doctest blocks

[wojdyr]

It would be nice to have the language of doctest blocks set to Python.
It matters in documents that have highlight_language set to something else (in my case c++).
I think in such cases it's currently necessary is to use the highlight directive before (and after) doctests.

It's not very convenient, so I monkey-patched it in my conf.py:

import sphinx.ext.doctest
def DoctestDirective_run(self):
    nodes = sphinx.ext.doctest.TestDirective.run(self)
    nodes[0]['language'] = 'pycon'
    return nodes
sphinx.ext.doctest.DoctestDirective.run = DoctestDirective_run

but it'd be more elegant to have it in ext/doctest.py, maybe next to these lines:

    if self.name == 'testoutput':
        # don't try to highlight output
        node['language'] = 'none'

[tk0miya]

Good point!