#!/bin/sh

tmp=$(mktemp -t "${0##*/}.XXXXXX")
trap "rm -rf '${tmp}'" EXIT
cat <<\EOF >"${tmp}"
decode() {
	awk -vid="$1" -vtype="$2" '$1 == id {
		match($0, /^[^=]*=\s*([^<]*)<([^>]*)>/, a);
		name = gensub(/\s+$/, "", "g", a[1]);
		name = gensub(/^"/, "", "g", name);
		name = gensub(/"$/, "", "g", name);
		name = gensub(/'\''/, "'\''\\\\'\'''\''", "g", name);
		email = a[2];
		print "export GIT_"type"_NAME='\''" name "'\'';"
		print "export GIT_"type"_EMAIL='\''" email "'\'';"
	}' "${author_file}"
}
EOF

for x in cvs-authors authors ; do
	export author_file="${PWD}/.git/${x}"
	[ -e "${author_file}" ] && break
	if [ -L "${author_file}" ] ; then
		echo "error: ${author_file} is a broken link"
		exit 1
	fi
done
if [ ! -e "${author_file}" ] ; then
	echo "error: could not find ${author_file}"
	exit 1
fi
FILTER_BRANCH_SQUELCH_WARNING=1 \
exec git filter-branch \
	--env-filter ". '${tmp}';"' \
		eval "$(decode "${GIT_AUTHOR_NAME}" AUTHOR)"; \
		eval "$(decode "${GIT_COMMITTER_NAME}" COMMITTER)"; \
' "$@"