using ant for non-compiling

In MS windows, I have a set of source files that I convert to another format using a .bat file and then combine into a single file.
I would like to be able to reprocess by only converting the source files that changed, and then combining the files. This seems
really similar to how ant processes javac, but I don't know how to make this work for .bat files instead. How would I create
an ant build.xml to do this?
for example, I have
using convert.bat on each separate file, I create
copy aaa.out+bbb.out+ccc.out+...+zzz.out myfile
but I only want to convert.bat the .txt files that have changed, so
that if the ggg.out timestamp is after the ggg.txt timestamp, just
use ggg.out.
Who is Participating?
KnightFireConnect With a Mentor Commented:
You could write a custom ant task to do this, then call it from ant. Would that work for you?
See for information on writing your own task, you simply extend, implement an execute method and setters for any attributes you want the task to have.
Then in your ant build file, you map the name of your new task to the class that implements it (the one you created above).

You could create a task that takes a bat file and a path as an argument, and calls the bat on all files in that path, or something similar.

On native Unix systems, you should be able to run shell scripts directly. On systems running a Unix-type shell (for example, Cygwin on Windows) execute the (command) shell instead - cmd  for batch files, sh for shell scripts - then pass the batch file or shell script (plus any arguments to the script) as a single command, using the /c or -c switch, respectively. See the above section  for example <exec> tasks executing sh. For batch files, use something like:

<exec dir="." executable="cmd" os="Windows NT">
  <arg line="/c test.bat"/>

Use properties. Using ant -Dname=value lets you define values for properties on the Ant command line. These properties can then be used within your build file as any normal property: ${name} will put in value.

If you have more questions, read here:

lfrohmanAuthor Commented:
     This doesn't help me at all, I already know how to call a .bat file, the problem is how
to call the batch file on all the input files, but only if they have a newer timestamp.
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