Ant Build-Script for my frontend projects

build.xml

<?xml version="1.0" encoding="UTF-8" ?>
<project name="sunlix" default="usage" basedir=".">

    <description>
        Build file for sunlix.de

        Content:
            1. Compile related tasks
            2. Deploy related tasks
            3. Clean related tasks
    </description>

    <!--
        How to use:
            - set path variables for your local system
            - go to the path where this build.xml file is located
              on your computer
            - run "ant deploy-preview" or "ant deploy-production"
              to deploy files
            - run "ant compile-preview" or "compile-production"
              if you only want to compile with compass
    -->

    <!-- modify these settings for your computer -->
    <property name="compiler" value="${basedir}/../../compiler.jar" />
    <!-- In particular, if you do not put a file extension on the executable, only ".EXE" files are looked for -->
    <condition property="compass-exec" value="compass.bat" else="compass">
        <os family="windows" />
    </condition>
    <property name="sass" value="${basedir}/sass" />
    <property name="assets" value="${basedir}/assets" />
    <property name="assets.js" value="${assets}/js" />
    <property name="assets.css" value="${assets}/css" />
    <property name="assets.img" value="${assets}/img" />
    <property name="assets.fonts" value="${assets}/fonts" />
    <property name="stage-preview-path" value="${basedir}/../prev" />
    <property name="stage-production-path" value="${basedir}/../prod" />

    <!-- create a white-list of files that should be deployed -->
    <fileset id="deployable" dir="${basedir}">
        <exclude name="sass/" />
        <include name="**/*.html" />
        <include name="**/*.css" />
        <include name="**/*.js" />
        <patternset id="img">
            <!-- image related -->
            <include name="**/*.png" />
            <include name="**/*.gif" />
            <include name="**/*.jpg" />
        </patternset>
        <patternset id="fonts">
            <!-- web font related -->
            <include name="**/*.eot" />
            <include name="**/*.otf" />
            <include name="**/*.svg" />
            <include name="**/*.ttf" />
            <include name="**/*.woff" />
            <include name="**/*.woff2" />
        </patternset>
    </fileset>

    <!--
        [Preperation] helper tasks
    -->
    <target name="usage" description="Display usage information">
        <echo message="Execute 'ant -projecthelp' for build file help." />
        <echo message="Execute 'ant -help' for Ant help." />
    </target>

    <!-- get all javascript files in YAML framework directories -->
    <target name="findAssets">
        <copy todir="${assets.js}" flatten="true" overwrite="true">
            <fileset dir="${sass}" includes="**/*.js" excludes="**/jquery.*.js" />
        </copy>
        <copy todir="${assets.js}/libs" flatten="true" overwrite="true">
            <fileset dir="${sass}" includes="**/jquery.*.js" />
        </copy>
        <copy todir="${assets.img}" flatten="true" overwrite="true">
            <fileset dir="${sass}">
                <patternset refid="img" />
            </fileset>
        </copy>
        <copy todir="${assets.fonts}" flatten="true" overwrite="true">
            <fileset dir="${sass}">
                <patternset refid="fonts" />
            </fileset>
        </copy>
        <available file="${assets.js}/libs" type="dir" property="assets.js.libs" />
    </target>

    <!-- concat javascript libraries -->
    <target name="concat" depends="findAssets" if="${assets.js.libs}" description="concatenate the javascript files">
        <echo message="concatenate js libs..." />
        <concat destfile="${assets.js}/jquery.libs.js">
            <fileset dir="${assets.js}/libs" includes="*.js" />
        </concat>
    </target>

    <!--
        [Compile] related tasks
    -->
    <target name="compile" depends="compile-preview" description="set default compile settings" />

    <target name="compile-preview" depends="concat" description="compile pretty for dev purposes, i.e. no compression, etc.">
        <echo message="compiling with compass ..." />
        <exec executable="${compass-exec}">
            <arg line="compile -e development --force" />
        </exec>
    </target>

    <target name="compile-production" depends="concat" description="compile for production purposes, i.e. compressed, etc.">
        <echo message="compiling with compass ..." />
        <exec executable="${compass-exec}">
            <arg line="compile -e production --force" />
        </exec>
        <!-- define js compression -->
        <!-- no advanced compilation due to no given externs for jquery -->
        <apply executable="java" parallel="false" verbose="true" dest="${assets.js}">
            <fileset dir="${assets.js}" includes="*.js" excludes="*.min.js" />
            <arg line="-jar" />
            <arg path="${compiler}" />
            <arg value="--warning_level" />
            <arg value="QUIET" />
            <arg value="--js_output_file" />
            <targetfile />
            <arg value="--js" />
            <mapper type="glob" from="*.js" to="*.min.js" />
        </apply>
    </target>

    <!--
        [Deploy] related tasks
    -->
    <target name="deploy" depends="deploy-preview" description="define default deployment behavior" />

    <target name="deploy-production" depends="compile-production" description="deploy files to production">
        <delete dir="${stage-production-path}" />
        <copy todir="${stage-production-path}">
            <fileset refid="deployable" />
        </copy>
        <antcall target="clear-cache" />
    </target>

    <target name="deploy-preview" depends="compile-preview" description="deploy files to preview">
        <delete dir="${stage-preview-path}" />
        <copy todir="${stage-preview-path}">
            <fileset refid="deployable" />
        </copy>
        <antcall target="clear-cache" />
    </target>

    <!--
        [Clean] related tasks
    -->
    <target name="clear-cache" description="delete all compiled files">
        <echo message="compass clean" />
        <exec executable="${compass-exec}" output="${basedir}/../compass-output.txt">
            <arg line="clean" />
        </exec>
        <delete dir="${assets}" />
    </target>

    <target name="clear" depends="clear-cache" description="delete all deployed files">
        <delete dir="${stage-preview-path}" />
        <delete dir="${stage-production-path}" />
    </target>
</project>