{-
Copyright (C) 2010 John MacFarlane <jgm@berkeley.edu>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-}

{- |
   Module      : Text.Pandoc.UTF8
   Copyright   : Copyright (C) 2010 John MacFarlane
   License     : GNU GPL, version 2 or above 

   Maintainer  : John MacFarlane <jgm@berkeley.edu>
   Stability   : alpha
   Portability : portable

UTF-8 aware string IO functions that will work with GHC 6.10, 6.12, or 7.
-}
module DatabaseDesign.Ampersand.Basics.UTF8
           ( readFile
            , writeFile
            , getContents
            , putStr
            , putStrLn
            , hGetContents
            , hPutStr
            , hPutStrLn
            )

where
import Codec.Binary.UTF8.String (encodeString)
import qualified Data.ByteString as B hiding (putStrLn)
import qualified Data.ByteString.Char8 as C (putStrLn)
import Data.ByteString.UTF8 (toString, fromString)
import Prelude hiding (readFile, writeFile, getContents, putStr, putStrLn)
import System.IO (Handle)
import Control.Monad (liftM)

bom :: B.ByteString
bom = B.pack [0xEF, 0xBB, 0xBF]

stripBOM :: B.ByteString -> B.ByteString
stripBOM s | bom `B.isPrefixOf` s = B.drop 3 s
stripBOM s = s

readFile :: FilePath -> IO String
readFile = liftM (toString . stripBOM) . B.readFile . encodeString

writeFile :: FilePath -> String -> IO ()
writeFile f = B.writeFile (encodeString f) . fromString

getContents :: IO String
getContents = liftM (toString . stripBOM) B.getContents

putStr :: String -> IO ()
putStr = B.putStr . fromString

putStrLn :: String -> IO ()
putStrLn = C.putStrLn . fromString

hGetContents :: Handle -> IO String
hGetContents h = liftM (toString . stripBOM) (B.hGetContents h)

hPutStr :: Handle -> String -> IO ()
hPutStr h = B.hPutStr h . fromString

hPutStrLn :: Handle -> String -> IO ()
hPutStrLn h s = hPutStr h (s ++ "\n")