How to programmatically concatenate with ANT?

Let me preface by saying that I'm new to ant, and I'm using version 1.6.5 if it matters.

I have a file with a list of files that I want to concatenate. The relevant part of my first attempt was this:

<target name="for-each">
    <xmlproperty file="scripts.xml" collapseAttributes="true" />
    <echo message="testing for-each"/>
    <concat destfile="${out}" fixlastline="yes" eol="lf">
        <foreach list="${scripts.src}" target="loop" param="var" delimiter=","/>
    </concat>
</target>

<target name="loop">
    <echo message="File :: ${var}"/>
    <fileset file="${SRC_DIR}${var}" />
</target>

However, concat doesn't support the foreach element.

I don't simply want to cut and paste a fileset into the concat element because it's reused and may be changed in the original file often, so I want to programmaticly iterate over the script elements listed in my file instead.

What would the right syntax be or how would I accomplish this?

Solution

I think your requirements are:

load the filelist from another xml file
concat this filelist together

If that's the case, there's no reason you should be making your own procedural loop. You can do something like:

scripts.xml

<scripts>
   <src>file1</src>
   <src>file2</src>
</scripts>

build.xml

<xmlproperty file="scripts.xml" collapseAttributes="true" />
<concat destfile="${out}" fixlastline="yes" eol="lf">
    <filelist files="${scripts.src}"/>
</concat>

is this the case?