add support for staging other types of blobs, like symlinks, into the index

Also added a utility TopFilePath type, which could stand to be used more
widely.

Git/UpdateIndex.hs

@@ -8,15 +8,17 @@
 module Git.UpdateIndex (
 	Streamer,
 	stream_update_index,
+	ls_tree,
 	update_index_line,
-	ls_tree
 ) where
 
 import System.Cmd.Utils
 
 import Common
 import Git
+import Git.Types
 import Git.Command
+import Git.FilePath
 
 {- Streamers are passed a callback and should feed it lines in the form
  - read by update-index, and generated by ls-tree. -}
@@ -37,13 +39,14 @@ stream_update_index repo as = do
 			hPutStr h s
 			hPutStr h "\0"
 
-{- Generates a line suitable to be fed into update-index, to add
- - a given file with a given sha. -}
-update_index_line :: Sha -> FilePath -> String
-update_index_line sha file = "100644 blob " ++ show sha ++ "\t" ++ file
-
 {- Gets the current tree for a ref. -}
 ls_tree :: Ref -> Repo -> Streamer
 ls_tree (Ref x) repo streamer = mapM_ streamer =<< pipeNullSplit params repo
 	where
 		params = map Param ["ls-tree", "-z", "-r", "--full-tree", x]
+
+{- Generates a line suitable to be fed into update-index, to add
+ - a given file with a given sha. -}
+update_index_line :: Sha -> BlobType -> TopFilePath -> String
+update_index_line sha filetype file =
+	show filetype ++ " blob " ++ show sha ++ "\t" ++ getTopFilePath file