import: New subcommand, pulls files from a directory outside the annex and adds them

Use case for this was developed somewhere on the Transiberian Railroad.

Command/Import.hs

@@ -0,0 +1,39 @@
+{- git-annex command
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.Import where
+
+import Common.Annex
+import Command
+import qualified Annex
+import qualified Command.Add
+
+def :: [Command]
+def = [command "import" paramPaths seek "move and add files from outside git working copy"]
+
+seek :: [CommandSeek]
+seek = [withPathContents start]
+
+start :: (FilePath, FilePath) -> CommandStart
+start (srcfile, destfile) = notBareRepo $
+	ifM (liftIO $ isRegularFile <$> getSymbolicLinkStatus srcfile)
+		( do
+			showStart "import" destfile
+			next $ perform srcfile destfile
+		, stop
+		)
+
+perform :: FilePath -> FilePath -> CommandPerform
+perform srcfile destfile = do
+	whenM (liftIO $ doesFileExist destfile) $
+		unlessM (Annex.getState Annex.force) $
+			error $ "not overwriting existing " ++ destfile ++
+				" (use --force to override)"
+ 
+	liftIO $ createDirectoryIfMissing True (parentDir destfile)
+	liftIO $ moveFile srcfile destfile
+	Command.Add.perform destfile