refactor

Meters.hs

@@ -0,0 +1,25 @@
+{- git-annex meters
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Meters where
+
+import Common
+import Types.Meters
+import Utility.Observed
+
+import qualified Data.ByteString.Lazy as L
+
+{- Sends the content of a file to an action, updating the meter as it's
+ - consumed. -}
+withMeteredFile :: FilePath -> MeterUpdate -> (L.ByteString -> IO a) -> IO a
+withMeteredFile f meterupdate a = withBinaryFile f ReadMode $ \h ->
+	hGetContentsObserved h (meterupdate . toInteger) >>= a
+
+{- Sends the content of a file to a Handle, updating the meter as it's
+ - written. -}
+sendMeteredFile :: FilePath -> MeterUpdate -> Handle -> IO ()
+sendMeteredFile f meterupdate h = withMeteredFile f meterupdate $ L.hPut h