build.xml

<!-- ANT build script for RMG -->
<project name="RMG">
  <property name="src" location="source/RMG"/>
  <property name="build" location="build/RMG"/>
  
  <target name="compile" depends="versioninfo">
    <javac srcdir="${src}" destdir="${build}" optimize="true" debug="true" includeantruntime="false" />
  </target>
  
  <target name="jar" depends="compile">
    <jar destfile="bin/RMG.jar" basedir="${build}">
      <manifest>
        <attribute name="Main-Class" value="RMG"/>
      </manifest>
    </jar>
  </target>
  
  <target name="clean" description="delete all compiled classes">
    <delete failonerror="false">
      <fileset dir="${build}">
        <include name="**/*.class"/>
        <include name="*.class"/>
        <include name="filter"/>
        <include name="jing/param/VersionInfo.java"/>
      </fileset>
      <fileset dir=".">
        <include name="bin/RMG.jar"/>
      </fileset>
    </delete>
  </target>
  
  <!-- all the following targets are just to get the Version Info into the log header --> 
  <target name="getHash" depends="inGitTest, HEADishashTarget, HEADisrefTarget" unless="inGit">
    <!-- this target is only executed if you are not in a git repository. 
    If you ARE in a git repository then instead its dependencies 
    (HEADis...Target) will set these params -->
    <property name="branchname" value="* Not in git repository"/>
    <property name="versionhash" value="* Not in git repository"/>
  </target>
  
  <target name="inGitTest" description="Test if inside a git repository">
    <condition property="inGit">
      <available file=".git/HEAD" />
    </condition>
  </target>
  <target name="isHEADhashTest" if="inGit">
    <!-- if the HEAD contains a hash, then this will set the property HEADishash
    otherwise the property will remain unset. This only runs if inGit -->
    <condition property="HEADishash">
      <length when="equal" length="41">
        <fileset dir="." includes=".git/HEAD">
          <containsregexp expression="[0-9a-f]{40}"/>
        </fileset>
      </length>
    </condition>
  </target>
  
  <target name="HEADishashTarget" depends="isHEADhashTest" if="HEADishash">
    <echo>The HEAD is a hash</echo>
    <loadfile property="versionhash" srcFile=".git/HEAD">
      <filterchain>
        <striplinebreaks/>
      </filterchain>
    </loadfile>
    <echo>versionhash = "${versionhash}"</echo>
    <property name="branchname" value="Not on a branch"/>
  </target>
  
  <target name="HEADisrefTarget" depends="isHEADhashTest" unless="HEADishash" if="inGit">
    <echo>The HEAD is a ref</echo>
    <loadfile property="headpath" srcFile=".git/HEAD" >
      <filterchain>
        <replacestring from="ref: " to=""/>
        <striplinebreaks/>
      </filterchain>
    </loadfile>
    <loadfile property="branchname" srcFile=".git/HEAD" >
      <filterchain>
        <replacestring from="ref: refs/heads/" to=""/>
        <striplinebreaks/>
      </filterchain>
    </loadfile>
    <echo>branchname = "${branchname}"</echo>
    
    <loadfile property="versionhash" srcFile=".git/${headpath}">
      <filterchain>
        <striplinebreaks/>
      </filterchain>
    </loadfile>
    <echo>versionhash = "${versionhash}"</echo>
  </target>
  
  <target name="versioninfo" depends="getHash">
    <!-- set the time stamp -->   
    <tstamp>
      <format property="buildtime" pattern="yyyy-MM-dd'T'HH:mm:ss"/>
    </tstamp>
    <!-- copy source file with filter -->
    <copy file="${src}/jing/param/VersionInfo.java" 
      toFile="${build}/jing/param/VersionInfo.java"
      overwrite="true" >
      <filterset>
        <filter token="builddate" value="${buildtime}"/>
        <filter token="branchname" value="${branchname}"/>
        <filter token="versionhash" value="${versionhash}"/>
      </filterset>
    </copy>
    <!-- compile the single java file into a class -->
    <javac srcdir="${build}/jing/param" 
      destdir="${build}" 
      includes="VersionInfo.java"
      optimize="true" debug="true" includeantruntime="false">
    </javac>  
  </target>

</project>