git-submodule: replace duplicated code with a module_list function

Several call sites in git-submodule.sh used the same idiom for getting
submodule information:

	git ls-files --stage -- "$@" | grep '^160000 '

This patch removes this duplication by introducing a module_list function.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -53,6 +53,15 @@ resolve_relative_url ()
 	echo "$remoteurl/$url"
 }
 
+#
+# Get submodule info for registered submodules
+# $@ = path to limit submodule list
+#
+module_list()
+{
+	git ls-files --stage -- "$@" | grep '^160000 '
+}
+
 #
 # Map submodule path to submodule name
 #
@@ -206,7 +215,7 @@ cmd_add()
 #
 cmd_foreach()
 {
-	git ls-files --stage | grep '^160000 ' |
+	module_list |
 	while read mode sha1 stage path
 	do
 		if test -e "$path"/.git
@@ -246,7 +255,7 @@ cmd_init()
 		shift
 	done
 
-	git ls-files --stage -- "$@" | grep '^160000 ' |
+	module_list "$@" |
 	while read mode sha1 stage path
 	do
 		# Skip already registered paths
@@ -304,7 +313,7 @@ cmd_update()
 		esac
 	done
 
-	git ls-files --stage -- "$@" | grep '^160000 ' |
+	module_list "$@" |
 	while read mode sha1 stage path
 	do
 		name=$(module_name "$path") || exit
@@ -569,7 +578,7 @@ cmd_status()
 		shift
 	done
 
-	git ls-files --stage -- "$@" | grep '^160000 ' |
+	module_list "$@" |
 	while read mode sha1 stage path
 	do
 		name=$(module_name "$path") || exit