#!/bin/bash
# Copyright 2016, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# change to root directory
cd $(dirname $0)/../..

function find_without_newline() {
  find . -type f -not -path './third_party/*' -and \(  \
                             -name '*.c'               \
                         -or -name '*.cc'              \
                         -or -name '*.proto'           \
                         -or -name '*.rb'              \
                         -or -name '*.py'              \
                         -or -name '*.cs'              \
                         -or -name '*.sh' \) -print0   \
                         | while IFS= read -r -d '' f; do
    if [[ ! -z $f ]]; then
      if [[ $(tail -c 1 "$f") != $NEWLINE ]]; then
        echo "Error: file '$f' is missing a trailing newline character."
        if $2; then  # fix
          sed -i -e '$a\' $f
          echo 'Fixed!'
        fi
      fi
    fi
  done
}

if [[ $# == 1 && $1 == '--fix' ]]; then
  ERRORS=$(find_without_newline true)
else
  ERRORS=$(find_without_newline false)
fi

if [[ "$ERRORS" != '' ]]; then
  echo "$ERRORS"
  if ! $FIX; then
    exit 1
  fi
fi