This is a python module that is will not be useful to anyone but me right now. You could fork it for your own purposes by removing the "summary" check.

Essentially it just takes a site_map.xml file (I genererated them from the mac application called Integrity) and parses it and compares it against another one to build a 301 redirect apache config.

The way I use it is when I do a new site design for a client. In order to save them broken links, before I cutover to the new site, I grab a sitemap of their old website (easy with Integrity) and then after the custover I get the new site_map.xml. This script compares the URLs, approximates an old URI to a new existing one and then renders the apache code for a 301 (permanent redirect.)