I'm looking for a good way of dealing with common flags in cmdargs. Currently what I do requires a bit of repetition that I'd really like to get rid of: 1. Data types data Modes = Cmd1 { foo :: String, ... } | Cmd2 { foo :: String, ... } 2. Mode specifications cmd1 = Cmd1 { foo = def &= help "..", ...} cmd2 = Cmd2 { foo = def &= help "..", ...} I have no idea how to deal with the repetition in the data types, so all suggestions are welcome. For the repetition in the mode specifications I attempted to factor the common bits into a "variable": flagFoo = "" &= help ".." but that resulted in only the first command getting the proper specification. I suppose this comes down to the impurity, but how do I work around that? (Especially, are there any good examples of using the pure part of the API?) /M -- Magnus Therning                      OpenPGP: 0xAB4DFBA4 email: magnus@therning.org   jabber: magnus@therning.org twitter: magthe               http://therning.org/magnus