#!/bin/sh
# -*- sh-basic-offset: 2 -*-

##
# Copyright (c) 2013-2016 Apple 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.
##

set -e;
set -u;

find_files () {
  where="$1"; shift;

  find "${where}"               \
    ! \(                        \
      -type d                   \
      \(                        \
        -name .git -o           \
        -name build -o          \
        -name data -o          \
        -name '_trial_temp*'    \
      \)                        \
      -prune                    \
    \)                          \
    -type f                     \
    ! -name '.#*'               \
    ! -name '#*#'               \
    ! -name '*~'                \
    ! -name '*.pyc'             \
    ! -name '*.log'             \
    ! -name update_copyrights   \
    -print0;
}

wd="$(pwd -P)";

this_year="$(date "+%Y")";
last_year=$((${this_year} - 1));

tmp="$(mktemp -t "$$")";
find_files "${wd}" > "${tmp}";

ff () { cat "${tmp}"; }

echo "Updating copyrights from ${last_year} to ${this_year}...";

ff | xargs -0 perl -i -pe 's|(Copyright \(c\) .*-)'"${last_year}"'( Apple)|${1}'"${this_year}"'${2}|';
ff | xargs -0 perl -i -pe 's|(Copyright \(c\) )'"${last_year}"'( Apple)|${1}'"${last_year}-${this_year}"'${2}|';

ff | xargs -0 grep -e 'Copyright (c) .* Apple' \
  | grep -v -e 'Copyright (c) .*'"${this_year}"' Apple' \
  ;

rm "${tmp}";
