build.xml

<?xml version="1.0" encoding="utf-8"?>
<project name="chronos">

  <target name="-optimize" description="Combine and minify files.">
    <exec executable="node">
        <arg value="${requirejs.optimizer.script}"/>
        <arg value="-o"/>
        <arg value="${requirejs.optimizer.settings}"/>
    </exec>
    <echo message="optimized ${requirejs.optimizer.settings} with node" />
  </target>

  <target name="assets.uptodate" depends="sourceDir.check" if="sourceDir.nochanges">
    <echo>${sourceDir} Hasn't been updated, skipping asset compilation.</echo>
  </target>

  <target name="sourceDir.check">
    <uptodate property="sourceDir.nochanges">
      <srcfiles dir="${sourceDir}" includes="**/*" />
      <mapper type="merge" to="${sourceDir}/build/build.txt" />
    </uptodate>
  </target>

  <target name="generateAssets" depends="assets.uptodate" unless="sourceDir.nochanges">
    <echo message="Combining and minifying JS files." />
    <antcall target="-optimize">
      <param name="requirejs.optimizer.script" value="${optimizerFile}" />
      <param name="requirejs.optimizer.settings" value="${configFile}" />
    </antcall>
  </target>
</project>