custom_rules.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="custom_rules">

  <property name="name" value="panic" />

  <target name="-getgitdetails" >
    <exec executable="git" outputproperty="git.describe">
      <arg value="describe"/>
    </exec>
    <exec executable="git" outputproperty="git.revision">
      <arg value="rev-parse"/>
      <arg value="HEAD"/>
    </exec>
    <property name="jar.name" value="${name}-${git.describe}" />
    <property name="javadoc.jar" value="${jar.name}-javadoc.jar" />
    <property name="source.jar" value="${jar.name}-source.jar" />
  </target>

  <target name="-pre-clean" depends="-getgitdetails">
    <property name="delete.pattern" value="${jar.name}*.jar*" />
    <echo message="deleting ${delete.pattern}" />
    <delete failonerror="false">
      <fileset dir="." includes="${delete.pattern}" />
    </delete>
  </target>

  <target name="-create-manifest">
    <echo message="Creating custom MANIFEST.MF" />
    <manifest file="MANIFEST.MF">
      <attribute name="Extension-Name" value="info.guardianproject.${name}"/>
      <attribute name="Implementation-Vendor" value="Guardian Project"/>
      <attribute name="Implementation-Title" value="PanicKit"/>
      <attribute name="Implementation-URL" value="https://dev.guardianproject.info/projects/${name}"/>
      <attribute name="Implementation-Git-URL" value="https://github.com/guardianproject/PanicKit"/>
    </manifest>
    <replaceregexp file="MANIFEST.MF"
                   match="\nCreated-By:.*?\n"
                   replace=""
                   flags="m"/>
  </target>

  <target name="-pre-build"  depends="-getgitdetails,-create-manifest">
    <echo message="running" />
  </target>

  <target name="javadoc" description="Generate Javadocs" depends="-pre-build">
    <property name="javadoc.dir" value="${out.dir}/javadoc" />
    <javadoc sourcepath="${source.dir}"
             classpath="${toString:project.all.jars.path}:${toString:project.target.class.path}"
             destdir="${javadoc.dir}"
             packagenames="info.guardianproject.*"
             additionalparam="-notimestamp"
             windowtitle="${ant.project.name}"
             linkoffline="https://developer.android.com/reference ${sdk.dir}/docs/reference"
             linksource="true"
             doctitle="${ant.project.name}" />
    <zip destfile="${javadoc.jar}">
      <zipfileset dir="." includes="MANIFEST.MF" prefix="META-INF" />
      <zipfileset dir="${javadoc.dir}" />
    </zip>
  </target>

  <target name="source" description="Generate Javadocs" depends="-build-setup,-getgitdetails">
    <zip destfile="${source.jar}">
      <zipfileset dir="." includes="MANIFEST.MF" prefix="META-INF" />
      <zipfileset dir="${source.dir}"
                  includes="info/**" />
    </zip>
    <delete file="${source.jar}.asc"/>
  </target>

  <target name="-post-build" depends="-getgitdetails">
    <condition property="build.is.debug" value="true" else="false">
      <equals arg1="${build.target}" arg2="debug" />
    </condition>
    <if condition="${build.is.debug}">
      <then>
        <property name="release.jar" value="${jar.name}-debug.jar" />
      </then>
      <else>
        <property name="release.jar" value="${jar.name}.jar" />
      </else>
    </if>
    <property file="${sdk.dir}/tools/source.properties" />
    <delete file="${release.jar}"/>
    <zip destfile="${release.jar}">
      <zipfileset dir="." includes="MANIFEST.MF" prefix="META-INF" />
      <zipfileset dir="${out.classes.absolute.dir}"
                  includes="info/**"
                  excludes="**/BuildConfig.class" />
    </zip>
  </target>

  <target name="release-all" depends="clean,release,javadoc,source" />

</project>