add docs

IPython/terminal/shortcuts/auto_match.py

@@ -1,3 +1,9 b''
+"""
+Utilities function for keybinding with prompt toolkit. 
+
+This will be bound to specific key press and filter modes, 
+like whether we are in edit mode, and whether the completer is open.
+"""
 import re
 from prompt_toolkit.key_binding import KeyPressEvent