Lifted versions of System functions. https://github.com/jcristovao/system-lifted
|Latest on Hackage:||0.2.0.1|
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Lifted versions of Haskell System functions.
While haskell promotes the use of
`Maybe and Either` as smart ways of dealing with errors, I found that the
support for their Monad Transformers counter-parts is less than stellar.
While some packages like Errors simplify this, they still add a lot of boilerplate to the code.
The goal of this project started out as a way to write cleaner directory related code in either one of the error related
monad transformers, namely
`EitherT, ErrorT or MaybeT (non-determinism and ListT` are not yet supported).
This is achieved through typeclasses, and thus, by simply declaring some simple template haskell at the start of a file:
type EitherIOText = EitherT Text deriveSystemLiftedErrors "DisallowIOE [HardwareFault]" ''EitherIOText deriveSystemDirectory ''EitherIOText
One could then write code like this:
getXdgConfigFolder :: EitherT IOException IO FilePath getXdgConfigFolder = isRW =<< getEnv "XDG_CONFIG_HOME"
`System.Directory and System.Environment are fully supported, and there is partial support for System.Unix.Users`.
More examples and wider
`System.` support is planned. Contribuitions are welcomed.