General ant-build for packaging a project to a .jar-file

General Ant-build

<?xml version="1.0" encoding="UTF-8"?>
<project name="" default="jar">
    <description>
	A general Ant-build file so I don't have to write it again from memory.
    	
    	Project-layout:
    	
    	-project
    		-src
    		-tests
    		-lib
    		build.xml
    </description>

	<property name="build.dir" value="build" />
	<property name="classes.dir" value="${build.dir}/classes" />
	<property name="dist.dir" value="${build.dir}/dist" />
	<property name="src.dir" value="src" />
	<property name="lib.repo" value="lib" />

	<pathconvert property="class.path">
		<path>
			<fileset dir="${lib.repo}">
				<include name="**/*.jar"/>
			</fileset>
		</path>
	</pathconvert>
	
	<target name="createDirs">
		<mkdir dir="${build.dir}"/>
		<mkdir dir="${classes.dir}"/>
		<mkdir dir="${dist.dir}"/>		
	</target>
	
    <target name="compile" depends="createDirs">
    	<javac srcdir="${src.dir}"
         destdir="${classes.dir}"
         classpath="${class.path}"
	/>
    </target>
	
	<pathconvert property="libs.project" pathsep=" ">
		    <mapper>
		      <chainedmapper>
		        <flattenmapper />
		        <globmapper from="*" to="lib/*" />
		      </chainedmapper>
		    </mapper>

		    <path>
		      <fileset dir="${lib.repo}">
		        <include name="**/*.jar" />
		      </fileset>
		    </path>
	</pathconvert>

    <target name="jar" depends="compile" description="description">
        <jar destfile="${dist.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
        	<manifest>
        		<attribute name="Main-Class" value=""/>
        		<attribute name="Class-Path" value="${libs.project}" />
        	</manifest>
        </jar>
    </target>


</project>