bind/util/unused-headers.sh

#!/bin/bash

# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0.  If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.

unused_headers=$(
  git ls-files -- '*.h' ':!:*include*' ':!:*rdata*' \
    | sed 's|.*/\(.*\.h\)|\1|' \
    | while read -r header; do
      git grep -q "#include \".*${header}\"" || echo "${header}"
    done

  git ls-files -- '*include/*.h' \
    | sed 's|.*/include\/\(.*\.h\)|\1|' \
    | while read -r header; do
      git grep -q "#include <${header}>" || echo "${header}"
    done
)

if [ -n "${unused_headers}" ]; then
  echo -e "Following headers are unused:\n${unused_headers}"
  exit 1
fi