oldbuild.xml

<target name="js-compile-all" description="Compile JavaScript files with Closure" unless="skip-js-compile">
    <echo>Compiling JS files in ${input.scripts.dir} in closure...</echo>
    <apply executable="java" dest="${output.scripts.dir}">
        <arg value="-jar"/>
        <arg path="${jar.lib.dir}/closure-compiler.jar"/>
        <arg line="--js"/>
        <srcfile/>
        <arg line="--js_output_file"/>
        <targetfile/>
        <fileset dir="${output.scripts.dir}" includes="**/*-main.debug.js" />
        <mapper type="glob" from="*-main.debug.js" to="*-main.min.js"/>
    </apply>
    <echo>Finished compiling JS files</echo>
</target>