text: from prompt_toolkit.buffer import Buffer
  from prompt_toolkit.filters import Condition
  
  class CLIBuffer(Buffer):
      def __init__(self, always_multiline, *args, **kwargs):
          self.always_multiline = always_multiline
  
          @Condition
          def is_multiline():
              doc = self.document
              return self.always_multiline and not _multiline_exception(doc.text)
  
          super(self.__class__, self).__init__(*args, is_multiline=is_multiline, **kwargs)
  
  def _multiline_exception(text):
      orig = text
      text = text.strip()
  
      # Multi-statement favorite query is a special case. Because there will
      # be a semicolon separating statements, we can't consider semicolon an
      # EOL. Let's consider an empty line an EOL instead.
      if text.startswith('\\fs'):
          return orig.endswith('\n')
  
      return (text.startswith('\\') or   # Special Command
              text.endswith(';') or      # Ended with a semi-colon
              (text == 'exit') or        # Exit doesn't need semi-colon
              (text == 'quit') or        # Quit doesn't need semi-colon
              (text == ':q') or          # To all the vim fans out there
              (text == '')               # Just a plain enter without any text
              )
  