#!/bin/sh
# vim: set sw=4 ts=4 sts=4 et :

usage() {
    printf 'usage: %s SRC DEST\n' "${0##*/}"
}

while [ $# -gt 0 ]; do
    case "$1" in
    -*)
        usage >&2
        exit 2
        ;;
    *)
        if [ -z "${src-}" ]; then
            src=$1
        elif [ -z "${dest-}" ]; then
            dest=$1
        else
            usage >&2
            exit 2
        fi
        ;;
    esac
    shift
done

if [ -z "${src-}" ] || [ -z "${dest-}" ]; then
    usage >&2
    exit 2
fi

set --

if pgversion=$(rpm -q --qf '%{V}' postgresql-server | cut -d. -f1); then
    set -- "$@" -e 's/@PGVERSION@/'"${pgversion}"/
fi

if [ $# -eq 0 ]; then
    echo 'Nothing to do' >&2
    exit 1
fi

set -x

sed -r "$@" "${src}" > "${dest}"