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