broke subcommands out into separate modules

Command/Get.hs

@@ -0,0 +1,31 @@
+{- git-annex command
+ -
+ - Copyright 2010 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.Get where
+
+import Command
+import qualified Backend
+import Types
+import Core
+
+{- Gets an annexed file from one of the backends. -}
+start :: SubCmdStartString
+start file = isAnnexed file $ \(key, backend) -> do
+	inannex <- inAnnex key
+	if (inannex)
+		then return Nothing
+		else do
+			showStart "get" file
+			return $ Just $ perform key backend
+
+perform :: Key -> Backend -> SubCmdPerform
+perform key backend = do
+	ok <- getViaTmp key (Backend.retrieveKeyFile backend key)
+	if (ok)
+		then return $ Just $ return True -- no cleanup needed
+		else return Nothing
+