broke subcommands out into separate modules

Command/Drop.hs

@@ -0,0 +1,50 @@
+{- git-annex command
+ -
+ - Copyright 2010 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.Drop where
+
+import Control.Monad.State (liftIO)
+import System.Directory
+
+import Command
+import qualified Annex
+import Locations
+import qualified Backend
+import LocationLog
+import Types
+import Core
+
+{- Indicates a file's content is not wanted anymore, and should be removed
+ - if it's safe to do so. -}
+start :: SubCmdStartString
+start file = isAnnexed file $ \(key, backend) -> do
+	inbackend <- Backend.hasKey key
+	if (not inbackend)
+		then return Nothing
+		else do
+			showStart "drop" file
+			return $ Just $ perform key backend
+
+perform :: Key -> Backend -> SubCmdPerform
+perform key backend = do
+	success <- Backend.removeKey backend key
+	if (success)
+		then return $ Just $ cleanup key
+		else return Nothing
+
+cleanup :: Key -> SubCmdCleanup
+cleanup key = do
+	logStatus key ValueMissing
+	inannex <- inAnnex key
+	if (inannex)
+		then do
+			g <- Annex.gitRepo
+			let loc = annexLocation g key
+			liftIO $ removeFile loc
+			return True
+		else return True
+