#!/usr/bin/env bash
# Copyright 2021 The Verible Authors.
#
# 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 -u  # only use variables once assigned
set -e  # error out on error.

FORMAT_OUT=${TMPDIR:-/tmp}/clang-format-diff.out

CLANG_FORMAT=${CLANG_FORMAT:-clang-format}
BUILDIFIER=${BUILDIFIER:-buildifier}

${CLANG_FORMAT} --version

# Run on all files.

find . -name "*.h" -o -name "*.cc" \
  | egrep -v 'third_party/|external_libs/|.github/' \
  | xargs -P2 ${CLANG_FORMAT} -i

# If we have buildifier installed, use that to format BUILD files
if command -v ${BUILDIFIER} >/dev/null; then
  echo "Run $(buildifier --version)"
  # TODO(hzeller): re-enable -lint=fix once compatible bazel version range again
  ${BUILDIFIER} MODULE.bazel $(find . -name BUILD -o -name "*.bzl")
fi

# Check if we got any diff
git diff > ${FORMAT_OUT}

if [ -s ${FORMAT_OUT} ]; then
   echo "Style not matching (see https://github.com/chipsalliance/verible/blob/master/CONTRIBUTING.md#style)"
   echo "Run"
   echo "  .github/bin/run-clang-format.sh"
   echo "-------------------------------------------------"
   echo
   cat ${FORMAT_OUT}
   exit 1
fi

exit 0