conf

Parser for Haskell-based configuration files.

Latest on Hackage:

0.1.1.0

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

BSD-3-Clause licensed by Cary M. Robbins

Maintained by [email protected]

This package is designed to allow you to create configuration files with declarative Haskell and parse the values back into Haskell code. The benefit here is to have a configuration file in Haskell that does not have to be recompiled - it is interpreted/parsed at runtime in a type-safe manner.

Example usage:

-- /path/to/my-config.hs
foo = ["bar", "baz"]
spam = Eggs

-- Application source
import Data.Conf
import Data.Maybe

data Spam = Eggs | Parrot | SomethingEntirelyDifferent
    deriving (Show, Read)

getSpam :: Conf -> Spam
getSpam = fromMaybe SomethingEntirelyDifferent . getConf "spam"

getFoo :: Conf -> Maybe Int
getFoo = getConf "foo"

main = do
    conf <- readConf "my-config.hs"
    print $ getSpam conf -- Output: Eggs
    print $ getFoo conf  -- Output: Nothing