wip RawFilePath

Goal is to make git-annex faster by using ByteString for all the
worktree traversal. For now, this is focusing on Command.Find,
in order to benchmark how much it helps. (All other commands are
temporarily disabled)

Currently in a very bad unbuildable in-between state.

Utility/Misc.hs

@@ -12,6 +12,7 @@ module Utility.Misc (
 	readFileStrict,
 	separate,
 	firstLine,
+	firstLine',
 	segment,
 	segmentDelim,
 	massReplace,
@@ -28,6 +29,7 @@ import Data.Char
 import Data.List
 import System.Exit
 import Control.Applicative
+import qualified Data.ByteString as S
 import Prelude
 
 {- A version of hgetContents that is not lazy. Ensures file is 
@@ -56,6 +58,11 @@ separate c l = unbreak $ break c l
 firstLine :: String -> String
 firstLine = takeWhile (/= '\n')
 
+firstLine' :: S.ByteString -> S.ByteString
+firstLine' = S.takeWhile (/= nl)
+  where
+	nl = fromIntegral (ord '\n')
+
 {- Splits a list into segments that are delimited by items matching
  - a predicate. (The delimiters are not included in the segments.)
  - Segments may be empty. -}