A script to manipulate tags on the email messages in a maildir. It depends on mu, that is used for email index and querying.
The tags are stored in a special header 'X-Keywords'. This header can be synced to gmail labels using a properly configured offlineimap since version 6.5.6
NOTE: Use this software at your own risk. This is a "works for me" kind of software, That I made public in case anyone is interested, but is not thorougly tested, and may lead to data loss. Also, there is no documentation for now.