Ability to suppress control-d exit behavior

changelog.md

@@ -8,6 +8,7 @@ Features
 * Add prompt format strings for socket connections.
 * Optionally defer auto-completions until a minimum number of characters is typed.
 * Make the completion interface more responsive using a background thread.
+* Option to suppress control-d exit behavior.
 
 
 Bug Fixes

mycli/key_bindings.py

@@ -1,7 +1,13 @@
 import logging
 
+from prompt_toolkit.application.current import get_app
 from prompt_toolkit.enums import EditingMode
-from prompt_toolkit.filters import completion_is_selected, control_is_searchable, emacs_mode
+from prompt_toolkit.filters import (
+    Condition,
+    completion_is_selected,
+    control_is_searchable,
+    emacs_mode,
+)
 from prompt_toolkit.key_binding import KeyBindings
 from prompt_toolkit.key_binding.key_processor import KeyPressEvent
 
@@ -11,6 +17,13 @@
 _logger = logging.getLogger(__name__)
 
 
+@Condition
+def ctrl_d_condition() -> bool:
+    """Ctrl-D exit binding is only active when the buffer is empty."""
+    app = get_app()
+    return not app.current_buffer.text
+
+
 def mycli_bindings(mycli) -> KeyBindings:
     """Custom key bindings for mycli."""
     kb = KeyBindings()
@@ -156,6 +169,16 @@ def _(event: KeyPressEvent) -> None:
         _logger.debug("Detected <alt-r> key.")
         search_history(event)
 
+    @kb.add('c-d', filter=ctrl_d_condition)
+    def _(event: KeyPressEvent) -> None:
+        """Exit mycli or ignore keypress."""
+        _logger.debug('Detected <C-d> key on empty line.')
+        mode = mycli.config.get('keys', {}).get('control_d', 'exit')
+        if mode == 'exit':
+            event.app.exit(exception=EOFError, style='class:exiting')
+        else:
+            event.app.output.bell()
+
     @kb.add("enter", filter=completion_is_selected)
     def _(event: KeyPressEvent) -> None:
         """Makes the enter key work as the tab key only when showing the menu.

mycli/myclirc

@@ -197,6 +197,10 @@ prompt_field_truncate = None
 prompt_section_truncate = None
 
 [keys]
+
+# possible values: exit, none
+control_d = exit
+
 # possible values: auto, fzf, reverse_isearch
 control_r = auto
 

test/myclirc

@@ -195,6 +195,10 @@ prompt_field_truncate = None
 prompt_section_truncate = None
 
 [keys]
+
+# possible values: exit, none
+control_d = exit
+
 # possible values: auto, fzf, reverse_isearch
 control_r = auto