build/gant.xml

<project name="Test gant invocation from Ant script" default="doGant" xmlns:if="ant:if">
  <dirname property="build.dir" file="${ant.file}"/>
  <property name="project.home" value="${build.dir}/.."/>
  <property name="idea.lib" value="${project.home}/lib"/>

  <condition property="gant.target" value="default">
    <not>
      <isset property="gant.target"/>
    </not>
  </condition>

  <target name="init" unless="intellij.build.scripts.deps">
    <condition property="gradle.executable" value="${project.home}/build/dependencies/gradlew.bat"
               else="${project.home}/build/dependencies/gradlew">
      <os family="windows"/>
    </condition>
    <exec executable="${gradle.executable}" dir="${project.home}/build/dependencies" failonerror="true">
      <env key="JAVA_HOME" value="${java.home}"/>
      <arg value="--no-daemon"/>
      <arg value="setupBuildScriptsDeps"/>
    </exec>
  </target>

  <target name="doGant" depends="init">
    <condition property="script.deps" value="${intellij.build.scripts.deps}" else="build/dependencies/build/build-scripts-deps">
      <isset property="intellij.build.scripts.deps"/>
    </condition>

    <path id="gant.classpath">
      <fileset dir="${project.home}/build/lib/jps">
        <include name="*.jar"/>
      </fileset>
      <pathelement path="${project.home}/platform/build-scripts/groovy"/>
      <pathelement path="${project.home}/build/groovy"/>
      <fileset file="${project.home}/jps/lib/optimizedFileManager.jar"/>
      <fileset dir="${project.home}/${script.deps}">
        <include name="*.jar"/>
      </fileset>
      <fileset dir="${idea.lib}">
        <include name="jdom.jar"/>
        <include name="log4j.jar"/>
        <include name="netty*.jar"/>
        <include name="asm-all.jar"/>
        <include name="jgoodies-forms.jar"/>
        <include name="picocontainer.jar"/>
        <include name="jna.jar"/>
        <include name="jna-platform.jar"/>
        <include name="snappy-in-java-*.jar"/>
        <include name="aether-*-all.jar"/>
        <include name="maven-aether-provider-*-all.jar"/>
        <include name="httpclient-*.jar"/>
        <include name="httpcore-*.jar"/>
        <include name="httpmime-*.jar"/>
        <include name="slf4j-api-*.jar"/>
        <include name="slf4j-log4j12-*.jar"/>
      </fileset>
    </path>

    <taskdef name="gant" classname="org.jetbrains.jps.gant.GantWithClasspathTask">
      <classpath refid="gant.classpath"/>
    </taskdef>

    <gant file="${gant.script}" target="${gant.target}"/>
  </target>
</project>