license header creator thingy

add_license.sh

#!/bin/bash

tmp=$(mktemp)   # Create a temporary file
trap "rm -f $tmp; exit 1" 0 1 2 3 13 15

header='// Copyright 2016 The Foo Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
'

for file in $@; do
	{
		echo "$header"
		cat $file
	} > $tmp
	mv $tmp $file
done

rm -f $tmp
trap 0