Generate HTTP 301 redirect rules from URL lists and filenames.

From a supported input format of URLs, fuzzy search a directory for filenames that are a sub-string of a URL and output a mapping in one of the supported output formats to stdout.

An input format can be one (or any) of:

• Google Webmaster Tools crawl errors CSV file
• A newline separated list of URLs

• rack-rewrite 301 static redirect
• Comma separated list

$ gen301 -use \
    --gcsv /tmp/Web_crawl_error_sources_www_tlvince_com_20110711T030411Z.csv" \
    --plain /tmp/disqus-urls.csv \
    --dirs ~/proj/blog/journal/entry \
    --output rack | sort > /tmp/301s

... which generated these redirects in production.