#!/bin/sh

HEADER=$(cat <<EOF
/* Copyright (C) vx-clutch
 * 
 * This file is part of yait
 *
 * This project and file is licenced under the BSD-3-Clause licence.
 * <https://opensource.org/licence/bsd-3-clause>
 */
EOF
)

len=${#}

i=0
for file in "$@"
do

i=$((i + 1))
printf 'Adding header [%d/%d] %s\n' $i $len $file

if grep -qF "$HEADER" "$file"; then
    continue
fi

tmp=$(mktemp)
printf '%s\n\n' "$HEADER" > "$tmp"
cat $file >> "$tmp"
mv "$tmp" $file

done