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|
{- types for SQL databases
-
- Copyright 2015-2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE TemplateHaskell #-}
module Database.Types where
import Database.Persist.TH
import Data.Maybe
import Data.Char
import Utility.PartialPrelude
import Key
import Utility.InodeCache
-- A serialized Key
newtype SKey = SKey String
deriving (Show, Read)
toSKey :: Key -> SKey
toSKey = SKey . key2file
fromSKey :: SKey -> Key
fromSKey (SKey s) = fromMaybe (error $ "bad serialized Key " ++ s) (file2key s)
derivePersistField "SKey"
-- A Key index. More efficient than SKey, but its Read instance does not
-- work when it's used in any kind of complex data structure.
newtype IKey = IKey String
instance Read IKey where
readsPrec _ s = [(IKey s, "")]
instance Show IKey where
show (IKey s) = s
toIKey :: Key -> IKey
toIKey = IKey . key2file
fromIKey :: IKey -> Key
fromIKey (IKey s) = fromMaybe (error $ "bad serialized Key " ++ s) (file2key s)
derivePersistField "IKey"
-- A serialized InodeCache
newtype SInodeCache = I String
deriving (Show, Read)
toSInodeCache :: InodeCache -> SInodeCache
toSInodeCache = I . showInodeCache
fromSInodeCache :: SInodeCache -> InodeCache
fromSInodeCache (I s) = fromMaybe (error $ "bad serialized InodeCache " ++ s) (readInodeCache s)
derivePersistField "SInodeCache"
-- A serialized FilePath.
--
-- Not all unicode characters round-trip through sqlite. In particular,
-- surrigate code points do not. So, escape the FilePath. But, only when
-- it contains such characters.
newtype SFilePath = SFilePath String
-- Note that Read instance does not work when used in any kind of complex
-- data structure.
instance Read SFilePath where
readsPrec _ s = [(SFilePath s, "")]
instance Show SFilePath where
show (SFilePath s) = s
toSFilePath :: FilePath -> SFilePath
toSFilePath s@('"':_) = SFilePath (show s)
toSFilePath s
| any needsescape s = SFilePath (show s)
| otherwise = SFilePath s
where
needsescape c = case generalCategory c of
Surrogate -> True
PrivateUse -> True
NotAssigned -> True
_ -> False
fromSFilePath :: SFilePath -> FilePath
fromSFilePath (SFilePath s@('"':_)) =
fromMaybe (error "bad serialized SFilePath " ++ s) (readish s)
fromSFilePath (SFilePath s) = s
derivePersistField "SFilePath"
|
