<project default="filter-internal">

  <property name="source.root" value="src/filter"/>
  <property name="dest.root" value="processed"/>
  <property name="pattern" value="**"/>

  <target name="init-filter-internal">
    <available property="has.filter.files" file="${source.root}"/>
  </target>

  <target name="filter-internal" depends="init-filter-internal" if="has.filter.files">
    <filter filtersfile="src/project.prp"/>
    <filter filtersfile="src/configs/${config}.prp"/>
   
    <copy todir="${dest.root}" overwrite="true" filtering="on" flatten="false">
      <fileset dir="${source.root}">
        <include name="${pattern}"/>
      </fileset>
    </copy>
  </target>

</project>