use clang-format format c/c++ files

batch_format.sh

#!/bin/bash
Usage() {
    echo "Usage: "$0" directory [maxdepth=1]"
    exit 1
}

SHELL_DIR=$(dirname $0)
if [[ $# -lt 1 || $1 = "-h" || $1 = "--help" ]]; then
    Usage
fi

if [ ! -d $1 ]; then
    echo "$1 is not directory"
    Usage
fi

MAXDEPTH=1
if [ $# -gt 1 ]; then
    MAXDEPTH=$2
fi

REGEX=".*\.(h|c|cc|cpp)"
FILES=$(find $1 -maxdepth $MAXDEPTH -regextype 'posix-egrep' -regex $REGEX)
for i in $FILES; do
    echo "clang-format -i "$i
    clang-format -i $i
done