Add a renaming script.

This is useful for changing all references of libvmod-example/example
into your new vmod name.

One-off task for all vmods, but if you write more than a couple you
quickly get fed up with this drudgery.

rename-vmod-script

+#!/bin/bash
+#
+# Script to rename libvmod-example into libvmod-foo.
+# (where "foo" is your new vmod name, of course.)
+#
+# Leaves the changes uncommitted in the working tree, so you get to fix any
+# unintended changes.
+#
+# Author: Lasse Karstensen <lkarsten@varnish-software.com>, September 2014.
+#
+set -o errexit
+
+NAME=$1
+if [ -z "$NAME" ]; then
+	echo "Usage: $0 <new-vmod-name-without-libvmod-prefix>"
+	echo "Rename libvmod-example source tree."
+	echo
+	exit -1
+fi
+
+if ! git diff-index --quiet HEAD --; then
+	echo "ERROR: Need a clean working tree. Run \"git stash\" first."
+	exit -2
+fi
+
+git mv src/vmod_example.c src/vmod_${NAME}.c
+git mv src/vmod_example.vcc src/vmod_${NAME}.vcc
+git mv vmod-example.spec vmod-${NAME}.spec
+
+git grep -z -l example | xargs -0 sed -i -s -e "s/example/${NAME}/g"
+
+echo "All done."
+echo -e "For your cut&paste needs:\n  git commit -a -m 'Automatic rename of libvmod-example to libvmod-tcp.'"
+
+
+