improve a bit

Logs/Chunk/Pure.hs

@@ -5,7 +5,13 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
-module Logs.Chunk.Pure where
+module Logs.Chunk.Pure 
+	( ChunkSize
+	, ChunkCount
+	, ChunkLog
+	, parseLog
+	, showLog
+	) where
 
 import Common.Annex
 import Logs.MapLog
@@ -21,12 +27,15 @@ parseLog :: String -> ChunkLog
 parseLog = parseMapLog fieldparser valueparser
   where
 	fieldparser s =
-		let (u,sz) = separate (== ':') s
+		let (u,sz) = separate (== sep) s
 		in (,) <$> pure (toUUID u) <*> readish sz
 	valueparser = readish
 
 showLog :: ChunkLog -> String
 showLog = showMapLog fieldshower valueshower
   where
-	fieldshower (u, sz) = fromUUID u ++ ':' : show sz
+	fieldshower (u, sz) = fromUUID u ++ sep : show sz
 	valueshower = show
+
+sep :: Char
+sep = ':'