wip RawFilePath

Goal is to make git-annex faster by using ByteString for all the
worktree traversal. For now, this is focusing on Command.Find,
in order to benchmark how much it helps. (All other commands are
temporarily disabled)

Currently in a very bad unbuildable in-between state.

Git/UpdateIndex.hs

@@ -1,11 +1,11 @@
 {- git-update-index library
  -
- - Copyright 2011-2018 Joey Hess <id@joeyh.name>
+ - Copyright 2011-2019 Joey Hess <id@joeyh.name>
  -
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
-{-# LANGUAGE BangPatterns, CPP #-}
+{-# LANGUAGE BangPatterns, OverloadedStrings, CPP #-}
 
 module Git.UpdateIndex (
 	Streamer,
@@ -32,12 +32,14 @@ import Git.FilePath
 import Git.Sha
 import qualified Git.DiffTreeItem as Diff
 
+import qualified Data.ByteString.Lazy as L
+
 {- Streamers are passed a callback and should feed it lines in the form
  - read by update-index, and generated by ls-tree. -}
-type Streamer = (String -> IO ()) -> IO ()
+type Streamer = (L.ByteString -> IO ()) -> IO ()
 
 {- A streamer with a precalculated value. -}
-pureStreamer :: String -> Streamer
+pureStreamer :: L.ByteString -> Streamer
 pureStreamer !s = \streamer -> streamer s
 
 {- Streams content into update-index from a list of Streamers. -}
@@ -49,8 +51,8 @@ data UpdateIndexHandle = UpdateIndexHandle ProcessHandle Handle
 
 streamUpdateIndex' :: UpdateIndexHandle -> Streamer -> IO ()
 streamUpdateIndex' (UpdateIndexHandle _ h) a = a $ \s -> do
-	hPutStr h s
-	hPutStr h "\0"
+	L.hPutStr h s
+	L.hPutStr h "\0"
 
 startUpdateIndex :: Repo -> IO UpdateIndexHandle
 startUpdateIndex repo = do
@@ -84,14 +86,13 @@ lsSubTree (Ref x) p repo streamer = do
 
 {- Generates a line suitable to be fed into update-index, to add
  - a given file with a given sha. -}
-updateIndexLine :: Sha -> TreeItemType -> TopFilePath -> String
-updateIndexLine sha treeitemtype file = concat
-	[ fmtTreeItemType treeitemtype
-	, " blob "
-	, fromRef sha
-	, "\t"
-	, indexPath file
-	]
+updateIndexLine :: Sha -> TreeItemType -> TopFilePath -> L.ByteString
+updateIndexLine sha treeitemtype file = L.fromStrict $
+	fmtTreeItemType treeitemtype
+	<> " blob "
+	<> encodeBS (fromRef sha)
+	<> "\t"
+	<> indexPath file
 
 stageFile :: Sha -> TreeItemType -> FilePath -> Repo -> IO Streamer
 stageFile sha treeitemtype file repo = do
@@ -105,7 +106,11 @@ unstageFile file repo = do
 	return $ unstageFile' p
 
 unstageFile' :: TopFilePath -> Streamer
-unstageFile' p = pureStreamer $ "0 " ++ fromRef nullSha ++ "\t" ++ indexPath p
+unstageFile' p = pureStreamer $ L.fromStrict $
+	"0 "
+	<> encodeBS' (fromRef nullSha)
+	<> "\t"
+	<> indexPath p
 
 {- A streamer that adds a symlink to the index. -}
 stageSymlink :: FilePath -> Sha -> Repo -> IO Streamer
@@ -123,7 +128,7 @@ stageDiffTreeItem d = case toTreeItemType (Diff.dstmode d) of
 	Just t -> pureStreamer $ updateIndexLine (Diff.dstsha d) t (Diff.file d)
 
 indexPath :: TopFilePath -> InternalGitPath
-indexPath = toInternalGitPath . getTopFilePath
+indexPath = toInternalGitPath . toRawFilePath . getTopFilePath
 
 {- Refreshes the index, by checking file stat information.  -}
 refreshIndex :: Repo -> ((FilePath -> IO ()) -> IO ()) -> IO Bool