def adjust_uri(self, uri, relativeto):
    """Adjust the given uri relative to a filename.

    This method is used by mako for filesystem based reasons.
    In dotted lookup land we don't adjust uri so we just return
    the value we are given without any change.

    """
    if uri.startswith('local:'):
        package = tg.config['pylons.package']
        if relativeto:
            cwd = os.getcwd()
            assert cwd.endswith(package)
            path_in_common = cwd[:-len(package)]
            assert relativeto.startswith(path_in_common)
            package = relativeto[len(path_in_common):]
            package = package.split('/', 2)[0]

        uri = uri.replace('local:', package + '.')
    if '.' in uri:
        # We are in the DottedTemplateLookup system so dots in
        # names should be treated as a Python path. Since this
        # method is called by template inheritance we must
        # support dotted names also in the inheritance.
        result = tg.config['pylons.app_globals'].\
            dotted_filename_finder.get_dotted_filename(template_name=uri,
                template_extension='.mak')

        if not self.template_filenames_cache.has_key(uri):
            # feed our filename cache if needed.
            self.template_filenames_cache[uri] = result

    else:
        # no dot detected, just return plain name
        result = uri

    return result