Add Apache 2.0 license to all files without license

insertlicense.sh

#!/bin/bash

IFILE=$1

./printlicense.sh $IFILE > "$IFILE.new"
echo "" >> "$IFILE.new"
cat $IFILE >> "$IFILE.new"
mv "$IFILE.new" $IFILE

main.sh

git grep -l -I -v 'www.apache.org' | xargs -L1 ./insertlicense.sh

printlicense.sh

#!/bin/bash
FILE=$1
FIRST_Y=`git log --diff-filter=A --follow --format=%aI -- $FILE | tail -1 | cut -d '-' -f 1`
LAST_Y=`git log -1 --format=%aI -- $FILE | tail -1 | cut -d '-' -f 1`
NAME=`git log --diff-filter=A --follow --format="%an <%ae>" -- $FILE`
FNAME=`basename $FILE`

case "${FNAME#*.}" in
  "erl")
    OPENING='%'
    CLOSING='%'
    COMMENT='%'
    ;;

  "ex")
    OPENING='#'
    CLOSING='#'
    COMMENT='#'
    ;;

  "exs")
    OPENING='#'
    CLOSING='#'
    COMMENT='#'
    ;;

  "c")
    OPENING='/*'
    CLOSING=' */'
    COMMENT=' *'
    ;;

  *)
    OPENING='#'
    CLOSING='#'
    COMMENT='#'
    ;;
esac


echo "$OPENING" >> "$FILE.new"

sed "s/%/$COMMENT/g" <<'END'
% This file is part of AtomVM.
%
END >> "$FILE.new"

if [ "$FIRST_Y" -eq "$LAST_Y" ]; then
    echo "% Copyright $FIRST_Y $NAME" | sed "s/%/$COMMENT/g" 
else
    echo "% Copyright $FIRST_Y-$LAST_Y $NAME" | sed "s/%/$COMMENT/g" 
fi

sed "s/%/$COMMENT/g" <<'END'
%
% 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.
%
% SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
END

echo "$CLOSING"