Gfilter provides an embedded DSL for writing Gmail mail filters, which can then be exported as XML which can be imported into Gmail.
This is heavily inspired by Britta, which is basically the same thing but in Ruby.
Why Haskell? Haskell is pretty good for embedded DSLs, I guess.
Note that Gmail queries have a maximum (string) length; to make it easier to write very long filters, Gfilter splits rules with long conditions into multiple rules by splitting on logical "or"s.
#!/usr/bin/env runhaskell
rules = [ List "somemailinglist.googlegroups.com" ==> [Archive, Label "somelist"]
, From "[email protected]" ==> [Star, Important]
, toOrCc "[email protected]" ==> [Important]
]
main = putStr $ compile rules
Run this example like ./example.hs > rules.xml. You can then go to the Filter settings in Gmail and use the "Import filters" option.
More powerful rules can be written by reusing condition clauses, like so:
toMe = To "[email protected]" `Or` To "[email protected]"
rules = [ toMe ==> [Important]
, List "somelist" `And` (Not toMe) ==> [Archive]
]
You get the point.