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{- git-annex UUID type
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Types.UUID where
-- A UUID is either an arbitrary opaque string, or UUID info may be missing.
data UUID = NoUUID | UUID String
deriving (Eq, Ord)
instance Show UUID where
show (UUID u) = u
show NoUUID = ""
instance Read UUID where
readsPrec _ s
| null s = [(NoUUID, "")]
| otherwise = [(UUID s, "")]
|
