#!/bin/sh
# Copyright 2024 Huawei Cloud Computing Technology Co., Ltd.
#
# 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.

#
# Include scanner
#   Parse file paths from command's space-separated stdout, select those that
#   start with "include/", and copy them to the user-defined output directory.
#
# Usage:
#   include_scan OUT_DIR ARGV...
#
# Example:
#   ./include_scan.sh out gcc -isystem include foo.c -E -M
#   -> Generates output directory "out/include" from gcc's output

set -eu

readonly OUT_DIR="$1"
shift

mkdir -p "${OUT_DIR}/include"

STDOUT="$("$@")" || exit $?
for FILE in $(echo "$STDOUT" | tr ' ' '\n' | sort | uniq); do
  FILE="$(realpath -s -m --relative-to=. "${FILE}")"
  if expr match "${FILE}" 'include/' >/dev/null; then
    OUT_PATH="${OUT_DIR}/${FILE}"
    if ! cp -n "${FILE}" "${OUT_PATH}" 2>/dev/null; then
      mkdir -p "$(dirname "${OUT_PATH}")"
      cp -n "${FILE}" "${OUT_PATH}"
    fi
  fi
done