{- misc utility functions
 -
 - Copyright 2010-2011 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Utility.Misc where

import System.IO
import Control.Monad
import GHC.IO.Encoding

{- Sets a Handle to use the filesystem encoding. This causes data
 - written or read from it to be encoded/decoded the same
 - as ghc 7.4 does to filenames et. This special encoding
 - allows "arbitrary undecodable bytes to be round-tripped through it". -}
fileEncoding :: Handle -> IO ()
fileEncoding h = hSetEncoding h =<< getFileSystemEncoding

{- A version of hgetContents that is not lazy. Ensures file is 
 - all read before it gets closed. -}
hGetContentsStrict :: Handle -> IO String
hGetContentsStrict = hGetContents >=> \s -> length s `seq` return s

{- A version of readFile that is not lazy. -}
readFileStrict :: FilePath -> IO String
readFileStrict = readFile >=> \s -> length s `seq` return s

{- Like break, but the character matching the condition is not included
 - in the second result list.
 -
 - separate (== ':') "foo:bar" = ("foo", "bar")
 - separate (== ':') "foobar" = ("foobar", "")
 -}
separate :: (a -> Bool) -> [a] -> ([a], [a])
separate c l = unbreak $ break c l
	where
		unbreak r@(a, b)
			| null b = r
			| otherwise = (a, tail b)

{- Breaks out the first line. -}
firstLine :: String-> String
firstLine = takeWhile (/= '\n')