Ant (or make) is not a general purpose scripting language! Mr. Bourne wrote a pretty good scripting language.
There are a number of issues with using ant as a scripting language:
- there is no pipe like mechanism
- the tasks are not ortoginal (concat has different parameters than copy for example)
- property imutablilty makes things difficult.
- support for looping is done via third-party addons like ant-contrib or antxtras.
note:
- (ant-contrib's var unset=true uses reflection to get access to private fields so it might
not work in future releases of ant)
One can extend ant by writting new tasks/types so here is my solution to the problem:
<pr:scripttypedef name="relativefileset" language="beanshell">
import org.apache.tools.ant.types.FileSet;
import org.apache.tools.ant.ProjectComponent;
import java.util.ArrayList;
import java.util.Iterator;
public class RelativeFileSet extends ProjectComponent {
private ArrayList list = new ArrayList();
public void addConfigured(FileSet fileset) {
for (file : fileset.getDirectoryScanner(getProject()).getIncludedFiles()) {
list.add(file);
}
}
public Iterator iterator() {
return list.iterator();
}
}
</pr:scripttypedef>
<property name="source.dir" location=".."/>
<property name="target.dir" location="target"/>
<mkdir dir="${target.dir}"/> <ac:for param="file">
<relativefileset>
<fileset dir="${source.dir}" includes="**/build.xml"/>
</relativefileset>
<sequential>
<concat destfile="${targetdir}/@{file}.concatenated">
<fileset file="${source.dir}/@{file}"/>
<filterchain>
<replacetokens>
<token key="parameter" value="value"/>
</replacetokens>
</filterchain>
</concat>
</sequential>
</ac:for>Matt Benson wrote:
--- Richard Russell <[EMAIL PROTECTED]> wrote:
I tried using <for> and <var>, but found that I
couldn't do much with <var>, as it appeared that the only way I could set
the var was with the <var> task, and I needed to use functionality in
<propertycopy> to get double-redirection. I can't *quite* recall why this
didn't work, but it didn't. If you like, I'll try to recreate what I was
trying to do, and see if I can demonstrate the problem I had...
Okay... my understanding of the problem was that you had a set of files whose contents you wanted to append to identically named files in another location... so I am ignoring recursive property resolution because I don't see how it applies... <var> is for use with <pathconvert>. You don't *really* need it, but here I would use it personally. Even better would be local properties for macros, but that's another story... so we are going to use <for> and <concat>...
I'm not sure what <pathconvert> can do for me
here... A mapper sounds more useful (eg <globmapper from="${dir1}/*"
to="${dir2}/*"/>), but I don't think it can be used
with <concat> ...
Ah, but since 1.6.2 <pathconvert> supports a nested <mapper>. Actually before that it also supported limited mapping via its <map> subelements, but I'm personally more comfortable with <mapper>s so that's what we'll use here... the following is untested:
<property name="dest.dir" location="dest" /> <property name="src.dir" location="src" />
<!-- mapper may not be perfect; experiment --> <mapper id="src2dest" type="glob" from="${src.dir}/*" to="${dest.dir}/*" />
<for param="f"> <fileset id="fs" dir="${src.dir}" includes="*" /> <sequential> <!-- unset so we can reuse --> <var name="destfile" unset="true" /> <fileset id="f" file="@{f}" /> <pathconvert property="destfile"> <path> <fileset refid="f" /> </path> <mapper refid="src2dest" /> </pathconvert> <concat destfile="${destfile}" append="true"> <fileset refid="f" /> </concat> <sequential> </for>
As you can see, I only used <var> to unset the destfile property. The alternative is to use a different property for every file... @{f}.dest perhaps, but large numbers of dynamically generated property names just feels wrong to me. That's an old argument. Anyway, the above should be somewhere in the neighborhood assuming I understood the problem correctly...
-Matt
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