build.xml

<project name="MeyersDiff" default="cleanBuildAndTest" basedir=".">

    <target name="init">
        <!-- Load the properties from 
           $HOME/ant.properties. 
           Please do not change any properties here. 
        -->
        <property file="${user.home}/ant.properties" />
        <property file="build.properties" />
    
        <!-- Intra-project directory configuration -->
        <property name="src.dir" value="./src" />
        <property name="gensrc.dir" value="./gensrc" />
        <property name="classes.dir" value="./classes" />
        <property name="lib.dir" value="./lib" />
        <property name="diff.version.dir" value="${gensrc.dir}/diff/version" />
        <property name="diff.dir" value="${src.dir}/java" />
        <property name="junit.log.dir" value="./log" />

        <!-- Target settings -->
        <property name="jar.file" value="Diff.jar" />
        <property name="debug.symbols" value="yes"/>
        
    </target>

    <target name="cleanBuildAndTest" depends="clean,jar,test"/>

    <target name="clean" depends="init">
        <!-- Remove VIM backup files.  -->
        <delete>
            <fileset dir="${basedir}" includes="**/*.*~" defaultexcludes="no"/>
        </delete>
            
        <delete dir="${classes.dir}" />            
        <delete dir="${diff.version.dir}" /> 
    </target>

    <target name="help">
    <echo>
cleanBuildAndTest - clean, build, and test
test - run all tests
    </echo>
    </target>

    <available file=".git" type="dir" property="git.present"/>

    <target name="git.revision" description="Store git revision in ${repository.version}" if="git.present">
        <exec executable="git" outputproperty="git.revision" failifexecutionfails="false" errorproperty="">
            <arg value="describe"/>
            <arg value="--tags"/>
            <arg value="--always"/>
            <arg value="HEAD"/>
        </exec>
        <condition property="repository.version" value="${git.revision}" else="unknown">
            <and>
                <isset property="git.revision"/>
                <length string="${git.revision}" trim="yes" length="0" when="greater"/>
            </and>
        </condition>
    </target>
    
    <target name="jar" depends="git.revision,compile">
        <mkdir dir="${lib.dir}" />        
        <jar jarfile="${lib.dir}/${jar.file}">
            <fileset dir="${classes.dir}"/>
            <manifest>
                <attribute name="Main-Class" value="diff.Main"/>
                <attribute name="Implementation-Version" value="${git.revision}"/>
            </manifest>
            </jar>
    </target>

	<!-- Compile Diff -->
	<target name="compile" depends="init"
                        description="Build and compile source files">
		<mkdir dir="${diff.version.dir}" />
		<mkdir dir="${classes.dir}" />

		<echo message="Setting Diff version ${git.revision}."/>
		<echo file="${diff.version.dir}/DiffVersion.java">
		package diff.version;
		public interface DiffVersion {
		    public static final String version="${git.revision}";
		}
		</echo>

		<javac 
			debug="${debug.symbols}" 
			destdir="${classes.dir}"
            includes="**/*.java"
			>
            <compilerarg value="-Xlint:unchecked"/>
			<src path="${diff.dir}"/>
			<src path="${gensrc.dir}"/>
		</javac>
	</target>

    <target name="test" depends="init">
        <java fork="true" jar="lib/${jar.file}">
            <jvmarg value="-ea"/>
            <arg value="testdata/foo.txt"/>
            <arg value="testdata/bar.txt"/>
        </java>
    </target>

</project>