{-# LANGUAGE GADTs #-}
{-# LANGUAGE RankNTypes #-}
module Distribution.Utils.IOData
(
IOData (..)
, IODataMode (..)
, KnownIODataMode (..)
, withIOData
, null
, hPutContents
) where
import qualified Data.ByteString.Lazy as LBS
import Distribution.Compat.Prelude hiding (null)
import qualified Prelude
import qualified System.IO
data IOData
= IODataText String
| IODataBinary LBS.ByteString
withIOData :: IOData -> (forall mode. IODataMode mode -> mode -> r) -> r
withIOData :: forall r.
IOData -> (forall mode. IODataMode mode -> mode -> r) -> r
withIOData (IODataText String
str) forall mode. IODataMode mode -> mode -> r
k = forall mode. IODataMode mode -> mode -> r
k IODataMode String
IODataModeText String
str
withIOData (IODataBinary ByteString
lbs) forall mode. IODataMode mode -> mode -> r
k = forall mode. IODataMode mode -> mode -> r
k IODataMode ByteString
IODataModeBinary ByteString
lbs
null :: IOData -> Bool
null :: IOData -> Bool
null (IODataText String
s) = forall (t :: * -> *) a. Foldable t => t a -> Bool
Prelude.null String
s
null (IODataBinary ByteString
b) = ByteString -> Bool
LBS.null ByteString
b
instance NFData IOData where
rnf :: IOData -> ()
rnf (IODataText String
s) = forall a. NFData a => a -> ()
rnf String
s
rnf (IODataBinary ByteString
lbs) = forall a. NFData a => a -> ()
rnf ByteString
lbs
class NFData mode => KnownIODataMode mode where
hGetIODataContents :: System.IO.Handle -> Prelude.IO mode
toIOData :: mode -> IOData
iodataMode :: IODataMode mode
data IODataMode mode where
IODataModeText :: IODataMode String
IODataModeBinary :: IODataMode LBS.ByteString
instance a ~ Char => KnownIODataMode [a] where
hGetIODataContents :: Handle -> IO [a]
hGetIODataContents Handle
h = do
Handle -> Bool -> IO ()
System.IO.hSetBinaryMode Handle
h Bool
False
Handle -> IO String
System.IO.hGetContents Handle
h
toIOData :: [a] -> IOData
toIOData = String -> IOData
IODataText
iodataMode :: IODataMode [a]
iodataMode = IODataMode String
IODataModeText
instance KnownIODataMode LBS.ByteString where
hGetIODataContents :: Handle -> IO ByteString
hGetIODataContents Handle
h = do
Handle -> Bool -> IO ()
System.IO.hSetBinaryMode Handle
h Bool
True
Handle -> IO ByteString
LBS.hGetContents Handle
h
toIOData :: ByteString -> IOData
toIOData = ByteString -> IOData
IODataBinary
iodataMode :: IODataMode ByteString
iodataMode = IODataMode ByteString
IODataModeBinary
hPutContents :: System.IO.Handle -> IOData -> Prelude.IO ()
hPutContents :: Handle -> IOData -> IO ()
hPutContents Handle
h (IODataText String
c) = do
Handle -> Bool -> IO ()
System.IO.hSetBinaryMode Handle
h Bool
False
Handle -> String -> IO ()
System.IO.hPutStr Handle
h String
c
Handle -> IO ()
System.IO.hClose Handle
h
hPutContents Handle
h (IODataBinary ByteString
c) = do
Handle -> Bool -> IO ()
System.IO.hSetBinaryMode Handle
h Bool
True
Handle -> ByteString -> IO ()
LBS.hPutStr Handle
h ByteString
c
Handle -> IO ()
System.IO.hClose Handle
h