code: def make_short(self, file):
      oldfile = file
      file = file.replace("+", "_")
      file = "".join(c for c in file if not c in r' "/\[]:;=,')
      parts = file.split(".")
      if len(parts) > 1:
          prefix = "".join(parts[:-1]).upper()
          suffix = parts[-1].upper()
          if not prefix:
              prefix = suffix
              suffix = None
      else:
          prefix = file.upper()
          suffix = None
      if (
          len(parts) < 3
          and len(prefix) <= 8
          and file == oldfile
          and (not suffix or len(suffix) <= 3)
      ):
          if suffix:
              file = prefix + "." + suffix
          else:
              file = prefix
      else:
          file = None
      if file is None or file in self.short_names:
          prefix = prefix[:6]
          if suffix:
              suffix = suffix[:3]
          pos = 1
          while 1:
              if suffix:
                  file = "%s~%d.%s" % (prefix, pos, suffix)
              else:
                  file = "%s~%d" % (prefix, pos)
              if file not in self.short_names:
                  break
              pos += 1
              assert pos < 10000
              if pos in (10, 100, 1000):
                  prefix = prefix[:-1]
      self.short_names.add(file)
      assert not re.search(
          r'[\?|><:/*"+,;=\[\]]', file
      )  # restrictions on short names
      return file
  
imports: from _msi import *
  import fnmatch
  import os
  import re
  import string
  import sys
  import warnings
label_desc: Use image node_id 3 for calling the Directory obj's underlying member method code with example usage: obj.make_short(file) and returns: file