submodule.diff

diff --git a/git-submodule.sh b/git-submodule.sh
index d189a24..1ab1f70 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -121,12 +121,29 @@ module_clone()
 	path=$1
 	url=$2
 	reference="$3"
+	submodulecachedir=$(git config --path submodule.cachedir)
 
 	if test -n "$reference"
 	then
 		git-clone "$reference" -n "$url" "$path"
 	else
-		git-clone -n "$url" "$path"
+		if test -n "$submodulecachedir" -a x$(which git-new-workdir) != x
+		then
+			cachedir="$submodulecachedir/$(echo $url | sed -e 's/:/\//g')"
+			if test ! -e "$cachedir"
+			then
+				git-clone -n "$url" "$cachedir"
+			fi
+			if test -e "$path"
+			then
+				# When git-clone parent repository,
+				# git-1.7.4+ makes submodule directory.
+				rmdir "$path"
+			fi
+			git-new-workdir "$cachedir" "$path"
+		else
+			git-clone -n "$url" "$path"
+		fi
 	fi ||
 	die "Clone of '$url' into submodule path '$path' failed"
 }