patch-plugin-version.xml

<project name="Plugin version patcher" default="patch-version" basedir=".">
  <property name="unzip.path" value="${artifact.output.path}/intellij-go-tmp"/>

  <target name="checkVariables">
    <condition property="${variables.are.set}">
      <and>
        <isset property="build.number"/>
        <isset property="artifact.output.path"/>
      </and>
    </condition>
  </target>

  <target name="clean">
    <delete dir="${unzip.path}" failonerror="false"/>
  </target>

  <target name="patch-version" depends="checkVariables,clean" if="${variables.are.set}">
    <unzip dest="${unzip.path}">
      <fileset dir="${artifact.output.path}" includes="intellij-go.jar"/>
    </unzip>

    <replace file="${unzip.path}/META-INF/plugin.xml"
        token="&lt;version&gt;1.0&lt;/version&gt;"
        value="&lt;version&gt;0.9.${build.number}&lt;/version&gt;"/>

    <zip destfile="${artifact.output.path}/intellij-go.jar">
      <fileset dir="${unzip.path}" includes="**"/>
    </zip>
  </target>
</project>