Clear Volatile and Backup Files

/* :name=Clear Volatile and Backup Files :description=
 * @author  Kos Ivantsov
 * @date    2016-09-12
 * @version 0.1
 */

import javax.swing.JOptionPane
import static javax.swing.JOptionPane.*
import static org.omegat.gui.main.ProjectUICommands.projectReload

title = "Delete files"
String.metaClass.confirm = { ->
        showConfirmDialog null, delegate, title, YES_NO_OPTION
}
String.metaClass.alert = { ->
        showMessageDialog null, delegate, title, INFORMATION_MESSAGE
        false
}

prop = project.projectProperties
if ( ! prop ) {
    message = "Please try again after you open a project."
    console.clear()
    console.println(message)
    message.alert()
    return
}
dir = delTrg = {
    it.eachDir(dir)
    it.eachFile{ it.delete() }
}
omtfolder = (prop.getProjectRoot() + "omegat")
rootfolder = (prop.getProjectRoot())
projname = new File(rootfolder).getName()
message = "The contents of target folder\n\
[${prop.getTargetRoot()}];\n\
all the project's memory backup files\n\
[${prop.getProjectRoot()}omegat${File.separator}project_save.tmx.*.bak];\n\
and all the export memory files\n\
[${prop.getProjectRoot()}$projname${File.separator}$projname-*.tmx]\n\
will be deleted. Proceed?"
if ( message.confirm() == 0 ) {
    delTrg new File(prop.getTargetRoot())
    for(File f: new File(omtfolder).listFiles())
        if(f.getName().startsWith("project_save.tmx") && f.getName().endsWith(".bak"))
         f.delete()
    for(File f: new File(rootfolder).listFiles())
        if(f.getName().startsWith(projname) && f.getName().endsWith(".tmx"))
         f.delete()
}else{
    console.println("Nothing deleted")
    return
}