Ant: How to execute a command for each file in directory?

user_76393 0
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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.

build-automation file-io ant build-process
8 Answers

Here is way to do this using javascript and the ant scriptdef task, you don't need ant-contrib for this code to work since scriptdef is a core ant task.

<scriptdef name="bzip2-files" language="javascript">
<element name="fileset" type="fileset"/>
<![CDATA[
  importClass(java.io.File);
  filesets = elements.get("fileset");

  for (i = 0; i < filesets.size(); ++i) {
    fileset = filesets.get(i);
    scanner = fileset.getDirectoryScanner(project);
    scanner.scan();
    files = scanner.getIncludedFiles();
    for( j=0; j < files.length; j++) {

        var basedir  = fileset.getDir(project);
        var filename = files[j];
        var src = new File(basedir, filename);
        var dest= new File(basedir, filename + ".bz2");

        bzip2 = self.project.createTask("bzip2");        
        bzip2.setSrc( src);
        bzip2.setDestfile(dest ); 
        bzip2.execute();
    }
  }
]]>
</scriptdef>

<bzip2-files>
    <fileset id="test" dir="upstream/classpath/jars/development">
            <include name="**/*.jar" />
    </fileset>
</bzip2-files>
user_4383190

You can use the ant-contrib task "for" to iterate on the list of files separate by any delimeter, default delimeter is ",".

Following is the sample file which shows this:

<project name="modify-files" default="main" basedir=".">
    <taskdef resource="net/sf/antcontrib/antlib.xml"/>
    <target name="main">
        <for list="FileA,FileB,FileC,FileD,FileE" param="file">
          <sequential>
            <echo>Updating file: @{file}</echo>
            <!-- Do something with file here -->
          </sequential>
        </for>                         
    </target>
</project>
user_13024080
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