I am writing a Sphinx extension and I need to know the document page source code file system path (.rst file location) to extract some version control system information of it. How can I get this information in my event handler / which event handler I should use?

Example:

# This package may contain traces of nuts


def on_html_page_context(app, pagename, templatename, context, doctree):
    import ipdb ; ipdb.set_trace()
    if doctree:
        print doctree.source

def setup(app):
    app.require_sphinx('1.0')
    app.connect('html-page-context', on_html_page_context)