#!/bin/bash

OWNER="Bill Zissimopoulos"
MATCH="(@c|C)opyright ([0-9]+)(-[0-9]+)? ${OWNER}(. All rights reserved.)?"
SUBST="\1opyright \2-$(date +%Y) ${OWNER}\4"

if [[ $# -eq 0 ]]; then
    echo "usage: $(basename $0) tree" 1>&2
    echo "WARNING: this will in-place edit your source files!" 1>&2
    exit 1
fi

if [[ "$(uname -s)" == Darwin* ]]; then
    find "$@" -type f -print0 | xargs -0 sed -E -i "" -e "s/$MATCH/$SUBST/"
else
    find "$@" -type f -print0 | xargs -0 sed -E -i""  -e "s/$MATCH/$SUBST/"
fi