// Counts Java source code lines

  var fileCount = 0;
  var lineCount = 0;

  extensions = newArray(".java", ".txt");
  dir = getDirectory("Choose a directory");
  find(dir);
  print("files: "+fileCount);
  print("lines: "+lineCount);

  function find(dir) {
      list = getFileList(dir);
      for (i=0; i<list.length; i++) {
          showProgress(i, list.length);
          if (endsWith(list[i], "/"))
              find(""+dir+list[i]);
          else if (valid(list[i])) {
              fileCount++;
              s = File.openAsString(dir+list[i]);
              lines = split(s, "\n");
              count = lines.length;
              lineCount += count;
              print(IJ.pad(count,4)+" "+dir+list[i]);
         }
      }
   }

  function valid(name) {
      for (i=0; i<extensions.length; i++) {
         if (endsWith(name, extensions[i]))
             return true;
      }
      return false;
  }