Pass any option to rubocop

script/rubocop-diff.sh

@@ -1,7 +1,11 @@
 #!/bin/bash
 #
 # While you are developing, you can call this script to check all
-# changed files. And then you can also tell Git to check before every
+# changed files. You can auto-correct them if you wish:
+#
+#   ./script/rubocop-diff.sh -a
+#
+# And then you can also tell Git to check before every
 # commit by adding this line to your `.git/hooks/pre-commit` file:
 #
 #   ./script/rubocop-diff.sh --cached || exit 1
@@ -26,7 +30,12 @@
 #
 # The default binstub is still the safest, always using the bundled version.
 : ${RUBOCOP_BIN="`dirname $0`/../bin/rubocop"}
-cached="$1" # may be empty
+
+if [ "$1" = "--cached" ]; then
+  cached="$1"
+else
+  rubocop_opt="$1"
+fi
 
 if git diff $cached --diff-filter=ACMR HEAD --quiet; then
 	# nothing changed
@@ -39,4 +48,5 @@ exec git diff $cached --name-only --relative --diff-filter=ACMR HEAD |\
           --force-exclusion \
           --fail-level A \
           --format simple \
-          --parallel --cache true
+          --parallel --cache true \
+	  "$rubocop_opt"