build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="ShellProcess" default="jar" basedir='.'>
  <property environment="env" />

  <property name="main.dir" value="." /> 
  <property name="src.dir" value="src" />
  <property name="build.dir" value="classes" />
  <property name="intellij.home" value="${env.IDEA_HOME}" />
  <property name="MANIFEST" value="META-INF/MANIFEST.MF" />
  <property name="BINARY" value="ShellProcess.jar" />

  <path id="intellij.classpath">
    <pathelement path="${intellij.home}/lib/openapi.jar" />
    <pathelement path="${intellij.home}/lib/util.jar" />
    <pathelement path="${intellij.home}/lib/extensions.jar" />
  </path>

  <target name="jar" depends="compile">
    <echo level="info" message="Building primary .jar file." />

    <manifest file="${MANIFEST}">
      <attribute name="Manifest-Version" value="1.0"/>
      <attribute name="Created-By" value="Morgan Schweers @ Google Inc"/>
      <attribute name="Built-By" value="${user.name}"/>
    </manifest>

    <jar jarfile="${BINARY}" manifest="${MANIFEST}" index="true">
      <fileset dir="${build.dir}" includes="**/*.class" />
      <fileset dir="${main.dir}" includes="META-INF/plugin.xml" />
    </jar>
  </target>

  <target name="compile">
    <tstamp/>
    <mkdir dir="${build.dir}" />
    <javac srcdir="${src.dir}" destdir="${build.dir}" debug="on" includeantruntime="false" >
      <classpath refid="intellij.classpath" />
      <include name="**/*.java" />
    </javac>
  </target>

  <target name="clean" description="Clean all build products.">
    <echo level="info" message="Clean all build products." />
    <delete file="${BINARY}" />
    <delete>
      <fileset dir="${build.dir}" includes="**/*.class" />
    </delete>
  </target>
</project>