gmailctl
Declarative configuration for Gmail filters
...If you use Gmail and have to maintain (like me) a lot of filters (to apply labels, get rid of spam or categorize your emails), then you probably have (like me) a very long list of messy filters. At a certain point one of your messages got mislabled and you try to understand why. You scroll through that horrible mess of filters, you wish you could find and replace stuff, test the changes on your filters before applying them, refactor some filters together... in a way treat them like you treat your code. Gmail allows one to import and export filters in XML format. ...