Rename Droid X picture files Groovy

motorolaDate.groovy

/*
* motorolaDate.groovy
* Renames photos taken by Droid X Cameras into something
* more sortable and useful.
*
* runs with groovy  http://groovy.codehaus.org/
*
* Download, edit the dirName variable, and then run: 
* groovy motorolaDate.groovy   
* The script will create sub-directories by year and month.
*/

  def dirName = '/home/user1/Pictures/new/droidx'
  def dir = new File(dirName)

  dir.eachFile{
    if (it.isFile()){
      //matches structure of motorola pics?
      if(!it.name.matches("[0-9]{4}\\-[0-9]{2}\\-[0-9]{2}_[0-9]{2}\\-[0-9]{2}\\-[0-9]{2}_[0-9]+.jpg") &&
         !it.name.matches("[0-9]{4}\\-[0-9]{2}\\-[0-9]{2}_[0-9]{2}\\-[0-9]{2}\\-[0-9]{2}_[0-9]+.3gp")){
        return
      }

      def periods = it.name.tokenize('.')
      def underscored = periods[0].tokenize('_')
      def day = underscored[0].replace('-', '')
      def time = underscored[1].tokenize('-')
      
      File newFile = new File(dirName + "/" + day + '_' + time[0] + time[1] + '_' + time[2] + '_' + underscored[2] + '.' + periods[periods.size -1])
      it.renameTo(newFile)
    }
  }