Make Sphinx generate RST class documentation from pydoc

The autodoc does generate RST only there is no official way to get it out of it. The easiest hack to get it was by changing sphinx.ext.autodoc.Documenter.add_line method to emit me the line it gets.

As all I want is one time migration, output to stdout is good enough for me:

def add_line(self, line, source, *lineno):
    """Append one line of generated reST to the output."""
    print(self.indent + line)
    self.directive.result.append(self.indent + line, source, *lineno)

Now autodoc prints generated RST on stdout while running and you can simply redirect or copy it elsewhere.

monkey patching autodoc so it works without needing to edit anything:

import sphinx.ext.autodoc
rst = []
def add_line(self, line, source, *lineno):
    """Append one line of generated reST to the output."""
    rst.append(line)
    self.directive.result.append(self.indent + line, source, *lineno)
sphinx.ext.autodoc.Documenter.add_line = add_line
try:
    sphinx.main(['sphinx-build', '-b', 'html', '-d', '_build/doctrees', '.', '_build/html'])
except SystemExit:
    with file('doc.rst', 'w') as f:
        for line in rst:
            print >>f, line