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module Types where
type HostName = String
type UserName = String
data Property = Property
{ propertyDesc :: Desc
-- must be idempotent; may run repeatedly
, propertySatisfy :: IO Result
}
type Desc = String
data Result = NoChange | MadeChange | FailedChange
deriving (Show, Eq)
combineResult :: Result -> Result -> Result
combineResult FailedChange _ = FailedChange
combineResult _ FailedChange = FailedChange
combineResult MadeChange _ = MadeChange
combineResult _ MadeChange = MadeChange
combineResult NoChange NoChange = NoChange
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