#!/bin/bash

# Copyright 2014 Google Inc. All rights reserved.
#
# 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.

# Print 1 if the file in $1 has the correct boilerplate header, 0 otherwise.
FILE=$1
EXT=${FILE##*.}

REF_FILE="$(dirname $0)/boilerplate.${EXT}.txt"

if [ ! -e $REF_FILE ]; then
  echo "1"
  exit 0
fi

LINES=$(cat "${REF_FILE}" | wc -l | tr -d ' ')
if [[ "${EXT}" == "go" ]]; then
  # remove build tags from the top of Go file
  DIFFER=$(cat "${FILE}" | sed '/\/\*/,$!d' | head "-${LINES}" | diff -q - "${REF_FILE}")
else
  DIFFER=$(head "-${LINES}" "${FILE}" | diff -q - "${REF_FILE}")
fi

if [[ -z "${DIFFER}" ]]; then
  echo "1"
  exit 0
fi

echo "0"