There is a project on source forge (http://ebuild.firefang.net/) which does this nicely however there are a couple of flaws in that version and I have created a new release (Sourceforge version TBA post a request to me and I will send it to you).
After downloading and placing the JAR into your ANT_HOME\lib directory, the way the project works is the typical task definition:
<taskdef resource="firefang_ant.properties" classpathref="ant.lib.classpath" />
... followed by a series of tasks the most useful of which is the eclipse_cp task.
This will read a specified .classpath file from your project and scan the entries it finds there.
ie.
<eclipse_cp action="libs" rootdir="${project.dir}" project="." result="proj.libs" />
See Eclipse Help
Your .classpath will look something like this:
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="src" path="test"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="lib" path="conf"/>
<classpathentry kind="con" path="org.apache.ivyde.eclipse.cpcontainer.IVYDE_CONTAINER/?ivyXmlPath=ivy.xml&confs=*"/>
<classpathentry kind="output" path="build"/>
</classpath>The action attribute on the task can be any of the following values:
lib : Which reads the library entries;
src: Which reads the source entries;
output : Which reads the library entries;
This produces a ';' separated list which can be used directly as a class path or it can have the libaries turned into fully qualified paths (the next iteration of the project).
ie.
<for list="${proj.libs}" param="lib" delimiter=";">
<sequential>
<echo message=" checking @{lib}"/>
<!--
<var name="build.classpath" value="${build.classpath};${project.dir}/@{lib}" />
-->
<if>
<available file="@{lib}"/>
<then>
<var name="build.classpath" value="${build.classpath};@{lib}" />
</then>
<else>
<var name="build.classpath" value="${build.classpath};${project.dir}/@{lib}" />
</else>
</if>
</sequential>
</for>
NB. The above uses ant-contrib v1 (http://ant-contrib.sourceforge.net/)
