#!/bin/bash
# Copyright (c) 2021-2022 Huawei Device 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.

# A very simple wrapper around clang-format:
# Compare the original file with what clang-format thinks it should
# look like and output corresponding diff. Exit with the same code as diff.
#
# USAGE:
# scripts/run-clang-format /path/to/clang-format /path/to/checked/file
#
# The only reason of this script's existence is to avoid messing with
# escaping special chatracters in CMake files.

CLANG_FORMAT_BIN=`which $1`
FILE_NAME=$2

if [ ! -x "$CLANG_FORMAT_BIN" ]; then
    echo "FATAL: clang-format binary '$CLANG_FORMAT_BIN' is not found or not executable"
    exit 1
fi

if [ ! -f "$FILE_NAME" ]; then
    echo "FATAL: Input file '$FILE_NAME' is not found"
    exit 1
fi

# Here we rely on diff's exit code:
diff -u --color=auto \
    --label="$FILE_NAME (original)" \
    --label="$FILE_NAME (reformatted)" \
    "$FILE_NAME" <($CLANG_FORMAT_BIN $FILE_NAME)