Conf: Parser for Haskell-based configuration files.

Installation

You can install this library from Hackage via cabal install conf

Description

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

Building

cabal sandbox init  # If you haven't already
cabal install -j --dependencies-only
cabal build

Running the Tests

cabal sandbox init  # If you haven't already
cabal install -j --enable-tests --dependencies-only
cabal test