build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project default="build" name="canonical-norseLit">
    <xmlproperty file="expath-pkg.xml"/>
    <property name="project.version" value="${package(version)}"/>
    <property name="project.app" value="canonical-norseLit"/>
    <property name="build.dir" value="build"/>
    <property name="copy.dir" value="pre-build"/>
    <property name="data.dir" value="data"/>
    <property name="root.dir" value="."/>
    <property name="data.required" value="__cts__.xml"/>

    <target name="copy">
      <copy todir="${copy.dir}" verbose="true">
        <fileset dir="${root.dir}">
            <include name="*"/>
        </fileset>
      </copy>
    </target>

    <target name="include" depends="copy">
        <!-- Remove files if they are not neighbour of required ${data.checkfile} -->
        <script language="javascript"> <![CDATA[
          var getInclude = function(list) {
              var o = {};
              for (i=0; i<list.length; i++) {
                var f = list[i];
                if(f.indexOf(inc_file) > 0) {
                    var folder = f.split("/").slice(0,-1).join("/");;
                    o[folder] = f;
                }
              }
              return o;
          }
          importClass(java.io.File);

          // Access to Ant-Properties by their names
          data_dir = project.getProperty("data.dir"); // The directory where you want to check for subdirectory including X
          copy_dir = project.getProperty("copy.dir"); // The directory where you want to check for subdirectory including X
          inc_file = project.getProperty("data.required"); // The file which says if a folder should be copie

          // Create a <fileset dir="" includes=""/> to retrieve everything from this folder
          fs = project.createDataType("fileset");
          fs.setDir( new File(data_dir) );
          fs.setIncludes("**");
          ds = fs.getDirectoryScanner(project); // Get the files (array) of that fileset
          files = ds.getIncludedFiles(); // Get only the files

          //Create destination and sourceDir File instances
          basedir = new File(".");
          destination = new File(basedir, [copy_dir, data_dir].join("/"));
          source = new File(basedir, data_dir);

          //We create an object where key are folder containing said inc_file
          exist = getInclude(files);
          includes = [];
          for (i=0; i<files.length; i++) {
            filename = files[i];
            folder = filename.split("/").slice(0,-1).join("/");
            if(exist[folder]) {
                f = new File(source, filename);
                copy = project.createTask("copy");
                copy.setTofile(new File(destination, filename));
                copy.setFile(f);
                copy.perform();
            }
          }
        ]]>
        </script>
    </target>

    <target name="delete-pre-build">
        <delete dir="${copy.dir}" />
    </target>

    <target name="xar" depends="copy">
        <mkdir dir="${build.dir}"/>
        <zip 
            basedir="${copy.dir}"
            destfile="${build.dir}/${project.app}-${project.version}.xar"
            excludes="${build.dir}/*"
        />
    </target>

    <target name="build" depends="include, xar, delete-pre-build"/>
</project>