build.xml

<project name="r-peridot" basedir="." default="main">

    <property name="src.dir"     value="src"/>

    <property name="build.dir"   value="out"/>
    <property name="classes.dir" value="${build.dir}/classes"/>
    <property name="jar.dir"     value="jar"/>

    <property name="main-class"  value="peridot.Main"/>
    <property name="deps.dir" value="${jar.dir}/deps/"/>
    <property name="lib.dir"     value="lib"/>
    <path id="classpath">
        <fileset dir="${lib.dir}" includes="**/*.jar"/>
    </path>
    

    <target name="clean">
        <delete dir="${build.dir}"/>
    </target>

    <target name="compile">
        <mkdir dir="${classes.dir}"/>
        <echo message="Using Java version ${ant.java.version}."/>
        <javac target="11" source="11" srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath"/>
    </target>

    <!-- Group all dependencies into a big dependency-all.jar -->
	<target name="copy-dependencies">

		<mkdir dir="${deps.dir}" />

		<jar jarfile="${deps.dir}/dependencies-all.jar">
			<zipgroupfileset dir="${lib.dir}">
				<include name="**/*.jar" />
			</zipgroupfileset>
		</jar>

	</target>

	<!-- jar it, extract above dependency-all.jar and zip it with project files -->
	<target name="jar" depends="compile, copy-dependencies" 
                description="package, output to JAR">
		<mkdir dir="${jar.dir}" />
		<mkdir dir="${deps.dir}" />

		<jar jarfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
			<manifest>
                <attribute name="Main-Class" value="${main-class}"/>
            </manifest>
			<zipfileset src="${deps.dir}/dependencies-all.jar" 
                                excludes="META-INF/*.SF" />
		</jar>
	</target>

    <!--<target name="jar" depends="compile">
        <mkdir dir="${jar.dir}"/>
        <jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
            <manifest>
                <attribute name="Main-Class" value="${main-class}"/>
            </manifest>
        </jar>
    </target> -->

    <target name="run" depends="jar">
        <java jar="${jar.dir}/${ant.project.name}.jar" fork="true"/>
    </target>

    <target name="clean-build" depends="clean,jar"/>

    <target name="main" depends="clean,run"/>

</project>