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{-# LANGUAGE PackageImports #-}
module Propellor.Exception where
import qualified "MonadCatchIO-transformers" Control.Monad.CatchIO as M
import Control.Exception
import Propellor.Types
import Propellor.Message
-- | Catches IO exceptions and returns FailedChange.
catchPropellor :: Propellor Result -> Propellor Result
catchPropellor a = either err return =<< tryPropellor a
where
err e = warningMessage (show e) >> return FailedChange
tryPropellor :: Propellor a -> Propellor (Either IOException a)
tryPropellor = M.try
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