new_contents: #!/usr/bin/python
  # -*- coding: utf-8 -*-
  """
      pdf_to_dag.py
      ~~~~~~~~~~~~~~
  
      list files within directories
  """
  import os
  import pickle
  
  def get_job_directory(input_path, output_path):
      """
          Returns:
              {}, contains original file information
      """
      info = {}
      count = 0
      for root, dirs, files in os.walk(input_path):
          fileinfos = {}
          for f in files:
              suffix = f.split('.')[-1].lower()
              if suffix == "pdf" or suffix.startswith("tif"):
                  filepath = os.path.join(root, f)
                  count += 1
  
                  new_job_folder_name = "job%03d" % count
                  new_job_folder_path = os.path.join(output_path, new_job_folder_name)
                  try:
                      os.makedirs(new_job_folder_path)
                  except OSError:
                      # it is acceptable to encounter makedir error before create symbol link
                      pass
  
                  link_name = os.path.join(new_job_folder_path, "input.%s" % suffix)
                  try:
                      os.symlink(filepath, link_name)
                      info[new_job_folder_name] = filepath
                  except os.error as e:
                      print "Fail to create symbol link %s towards %s" % (link_name, filepath)
                      raise e
      return info
  
  
  def main(argv):
      if len(argv) == 3 and os.path.isdir(argv[1]) and not os.path.exists(argv[2]):
          info = get_job_directory(argv[1], argv[2])
          try:
              with open(os.path.join(argv[2], "filepath_mapping.pickle"), 'wb') as f:
                  pickle.dump(info, f)
          except pickle.PickleError as e:
              print "WARNING: Fail to serialize original filepath information"
              raise e
          else:
              print "Succeed!"
      else:
          print "Please indicate existed input path and non-existed output directory!"
          sys.exit(1)
  
  
  if __name__ == '__main__':
      import sys
      main(sys.argv)
  
subject: add pdf to dag conversion tool