#!/bin/sh
#
#  Copyright (c) 2018, The OpenThread Authors.
#  All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#  1. Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#  2. 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.
#  3. Neither the name of the copyright holder 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 HOLDER 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.
#

CLANG_FORMAT_VERSION="clang-format version 6.0"

die() {
    echo " *** ERROR: " $*
    exit 1
}

if which clang-format-6.0 > /dev/null; then
    alias clang-format=clang-format-6.0
elif which clang-format > /dev/null; then
    case "$(clang-format --version)" in
        "$CLANG_FORMAT_VERSION"*)
            ;;
        *)
            die "$(clang-format --version); clang-format 6.0 required"
            ;;
    esac
else
    die "clang-format 6.0 required"
fi

clang-format $@ || die

# ensure EOF newline
REPLACE=no
for arg
do
    case $arg in
        -i)
            REPLACE=yes
            ;;
    esac
done

file=$arg

[ $REPLACE != yes ] || {
    [ -n "$(tail -c1 $file)" ] && echo >> $file
}

exit 0