broke out Git/HashObject.hs

Git/HashObject.hs

@@ -0,0 +1,29 @@
+{- git hash-object interface
+ -
+ - Copyright 2011 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Git.HashObject where
+
+import Common
+import Git
+
+{- Injects a set of files into git, returning the shas of the objects. -}
+hashFiles :: [FilePath] -> Repo -> IO [Sha]
+hashFiles paths repo = do
+	(pid, fromh, toh) <- hPipeBoth "git" $ toCommand $ git_hash_object repo
+	_ <- forkProcess (feeder toh)
+	hClose toh
+	shas <- map Git.Ref . lines <$> hGetContents fromh
+	hClose fromh
+	forceSuccess pid
+	return shas
+	where
+		git_hash_object = Git.gitCommandLine
+			[Param "hash-object", Param "-w", Param "--stdin-paths"]
+		feeder toh = do
+			hPutStr toh $ unlines paths
+			hClose toh
+			exitSuccess