code: def reformat_text_before_cursor(buffer, document, shell):
      text = buffer.delete_before_cursor(
          len(document.text[: document.cursor_position])
      )
      try:
          formatted_text = shell.reformat_handler(text)
          buffer.insert_text(formatted_text)
      except Exception as e:
          buffer.insert_text(text)
  
imports: import os
  import signal
  import sys
  import warnings
  from dataclasses import dataclass
  from typing import Callable, Any, Optional, List
  from prompt_toolkit.application.current import get_app
  from prompt_toolkit.key_binding import KeyBindings
  from prompt_toolkit.key_binding.key_processor import KeyPressEvent
  from prompt_toolkit.key_binding.bindings import named_commands
  from prompt_toolkit.key_binding.bindings.completion import display_completions_like_readline
  from prompt_toolkit.key_binding.vi_state import InputMode, ViState
  from prompt_toolkit.filters import Condition
  from IPython.core.getipython import get_ipython
  from IPython.terminal.shortcuts import auto_match
  from IPython.terminal.shortcuts import auto_suggest
  from IPython.terminal.shortcuts.filters import filter_from_string
  from IPython.utils.decorators import undoc
  from prompt_toolkit.enums import DEFAULT_BUFFER
label_desc: Use image node_id 5 for calling a global function with example usage: reformat_text_before_cursor(buffer, document, shell) without return types