Ant: Concatenate properties from a fileset - ant

Question

I am trying to do the following in ANT but I am stuck.
Read which projects are installed in my project workspace.
workspace
buildtools
build.xml
project1
build.xml
project.name = "project1"
IP = "44.55.66.77"
SERVER_NAME = "project1.local"
DOCUMENT_ROOT = "c:\inetpub\project1"
project2
build.xml
project.name = "project2"
IP = "44.55.66.77"
SERVER_NAME = "project2.local"
DOCUMENT_ROOT = "c:\inetpub\project2"
....
Create an Apache virtualhost directive for each project.
<VirtualHost 44.55.66.77>
DocumentRoot "c:\inetpub\project1"
ServerName project1.local
</VirtualHost>
<VirtualHost 44.55.66.77>
DocumentRoot "c:\inetpub\project2"
ServerName project2.local
</VirtualHost>
....
Concatenate the virtualhost directives into an Apache configuration file.
I have spent many hours studying the different tasks that I could use. Concat, loadproperties, fileset, filterreaders, etc.. I get overwhelmed with all the possibilities and my head spins.
Here is my horrible guess at how this might be done:
<concat destfile={$apache.config.file}>
<fileset>
<include name="**/build.xml"/>
<loadproperties resource="fileset.item.project.name???"/>
<filterchain>
<replacetokens>
<token key="IP"
value="${p.IP}"/>
<token key="DOCUMENT_ROOT"
value="${p.DOCUMENT_ROOT}"/>
<token key="SERVER_NAME"
value="${p.SERVER_NAME}"/>
</replacetokens>
</filterchain>
</fileset>
<concat>
Thanks for the help!

Answer 1

I think basically you shouldn't load build.xml files containing properties as standard property files as they are not property files (I mean key=value per line files). You should import them if you need the stuff from them.
I suggest you doing such things with a Groovy snippet.
<!-- this is only a sketch, not a working solution -->
<path id="gr">
<pathelement location="/path/to/groovy-all.jar"/>
</path>
<taskdef name="groovy"
classname="org.codehaus.groovy.ant.Groovy"
classpathref="gr"/>
<groovy>
def b1 = new XmlParser().parse(new File("project1/build.xml")));
def b2 = new XmlParser().parse(new File("project2/build.xml")));
def f = new File("output.xml");
def ip1 = b2.property.find { it.name == 'IP'}.text();
def ip2 = ..
// get out all the stuff you need from the build.xml files with GPath
f.write("<VirtualHost ${ip1}>");
f.write(" DocumentRoot ${r1}");
f.write(" ServerName ${s1}");
f.write("<VirtualHost>");
</groovy>