JarJar with Ant - how to use a Rule file - ant

Question

I would like to know how to run JarJar with Ant, passing the rules in with an external Rules file.
1) I know I can pass the rules in one by one as below:
<jarjar destfile="B.jar" >
<zipfileset src="A.jar" />
<rule pattern="com.a.**" result="test.b.#1" />
</jarjar>
2) I know I can pass the rules in a file if I run it from the command line:
java -jar jarjar.jar process <rulesFile> <inJar> <outJar>
3) I can use the above command line in an Ant <exec> task. (best workaround)
4) I found some reference to using a <rulesFile> tag in Maven.
The above options are not ideal for what I would like to do.
I want to run JarJar from an Ant task, passing in a rules file.

Answer 1

I have been unable to get any information about this, from any forum, or by mailing the developers of JarJar, so I have decided to answer this question with a workaround that I am using:
Use the DOCTYPE & ENTITY xml entities (as per suggestion on Ant website)
As an example, the below build.xml file includes the contents of another test.txt file inline. I import the text file using the tag include_this (this is my name - you can use any name here):
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE project [
<!ENTITY include_this SYSTEM "test.txt">
]>
<project name="Test" default="build" >
<target name="build" >
&include_this;
</target>
</project>
In this simple example, the contents of the test.txt file is:
<echo>This is a test.</echo>
So I've been using this workaround to replace the rules in the jarjar call. Putting the rules in the test.txt file:
<rule pattern="com.**" result="${project.output}.com.#1" />
<rule pattern="org.**" result="${project.output}.org.#1" />
My jarjar call then becomes:
<!-- jarjar uses the same syntax as the jar task -->
<jarjar destfile="${jarjar.output.dir}/${project.output}.jar" >
<!-- source files -->
<zipfileset src="${jar.output.dir}/${project.output}.jar" />
<!-- refactoring rules -->
&include_this;
</jarjar>