docs: def diff_a_thing(thing, opt):
      """Handle the diff action for a single thing. It may be a Vault backend
      implementation or it may be a Vault data resource"""
      changed = thing.diff()
      if changed == ADD:
          print("%s %s" % (maybe_colored("+", "green", opt), str(thing)))
      elif changed == DEL:
          print("%s %s" % (maybe_colored("-", "red", opt), str(thing)))
      elif changed == CHANGED:
          print("%s %s" % (maybe_colored("~", "yellow", opt), str(thing)))
      elif changed == OVERWRITE:
          print("%s %s" % (maybe_colored("+", "yellow", opt), str(thing)))
      elif changed == CONFLICT:
          print("%s %s" % (maybe_colored("!", "red", opt), str(thing)))
  
      if changed != OVERWRITE and changed != NOOP:
          maybe_details(thing, opt)