title: Ant: Convert comma-delimited list of relative paths to path
body: <p>I have a comma-delimited list of directories:</p>
  
  <pre><code>foo,bar,baz,qux
  </code></pre>
  
  <p>I want to convert it to an Ant path containing (something like) the following:</p>
  
  <pre><code>${basedir}/build/foo/classes
  ${basedir}/build/bar/classes
  ${basedir}/build/baz/classes
  ${basedir}/build/qux/classes
  </code></pre>
  
  <p>It seems like there should be a way to do this with <code>&lt;pathconvert&gt;</code>, but it's not obvious to me what it would be. Suggestions?</p>