Hello!
I want to execute a command from an Ant buildfile, for each file in a directory.
I am looking for a platform-independent solution.
How do I do this?
Sure, I could write a script in some scripting language, but this would add further dependencies to the project.
ant-contrib is evil; write a custom ant task.
ant-contrib is evil because it tries to convert ant from a declarative style to an imperative style. But xml makes a crap programming language.
By contrast a custom ant task allows you to write in a real language (Java), with a real IDE, where you can write unit tests to make sure you have the behavior you want, and then make a clean declaration in your build script about the behavior you want.
This rant only matters if you care about writing maintainable ant scripts. If you don't care about maintainability by all means do whatever works. :)
Jtf
An approach without ant-contrib is suggested by Tassilo Horn (the original target is here)
Basicly, as there is no extension of <java> (yet?) in the same way that <apply> extends <exec>, he suggests to use <apply> (which can of course also run a java programm in a command line)
Here some examples:
<apply executable="java">
<arg value="-cp"/>
<arg pathref="classpath"/>
<arg value="-f"/>
<srcfile/>
<arg line="-o ${output.dir}"/>
<fileset dir="${input.dir}" includes="*.txt"/>
</apply>
Use the <apply> task.
It executes a command once for each file. Specify the files by means of filesets or any other resource. <apply> is built-in; no additional dependency needed; no custom task implementation needed.
It's also possible to run the command only once, appending all files as arguments in one go. Use the parallel attribute to switch the behaviour.
Sorry for being late a year.