feat(ui): add as-you-type filtering to the slash command menu

gcode/ui.py

@@ -96,7 +96,10 @@ def goodbye(self, session: str) -> None:
     def _show_slash_menu(self) -> str:
         """Show an interactive slash command menu with arrow key navigation.
 
-        Returns the selected command string (e.g. '/help').
+        Typing filters the list as you type (case-insensitive substring match,
+        e.g. "oll" narrows to /ollama); Backspace edits the filter, Enter runs
+        the highlighted command, and Esc cancels. Returns the selected command
+        string (e.g. '/help'), or "" when the user cancels or nothing matches.
         """
         choices = [f"{cmd}  — {desc}" for cmd, desc in _SLASH_COMMANDS]
 
@@ -105,7 +108,9 @@ def _show_slash_menu(self) -> str:
                 "Select a command:",
                 choices=choices,
                 use_shortcuts=False,
-                instruction="(↑↓ navigate, Enter select, Esc cancel)",
+                use_search_filter=True,
+                use_jk_keys=False,  # j/k are consumed by the search filter
+                instruction="(↑↓ navigate, type to filter, Enter select, Esc cancel)",
             ).ask()
         except KeyboardInterrupt:
             return ""

tests/test_ui.py

@@ -1,7 +1,16 @@
-from gcode.ui import RichUI
+from unittest.mock import Mock, patch
+
+from gcode.ui import _SLASH_COMMANDS, RichUI
 from rich.console import Console
 
 
+def _select_mock(return_value):
+    """Return a questionary.select() mock whose .ask() yields return_value."""
+    fake_q = Mock()
+    fake_q.ask.return_value = return_value
+    return patch("gcode.ui.questionary.select", return_value=fake_q), fake_q
+
+
 def test_goodbye_renders_logo_and_session():
     ui = RichUI()
     ui.console = Console(record=True, width=120)
@@ -13,3 +22,53 @@ def test_goodbye_renders_logo_and_session():
     assert "Thanks for coding with GCode." in output
     assert "session" in output.lower()
     assert "demo-session" in output
+
+
+def test_slash_menu_enables_type_to_filter():
+    """The slash menu turns on questionary's as-you-type search filter.
+
+    Typing narrows the choices (e.g. "oll" filters to /ollama), while arrow
+    keys, Enter, and Esc keep working. j/k must be disabled because questionary
+    rejects combining them with the search filter.
+    """
+    ui = RichUI()
+    patcher, _ = _select_mock("/ollama  — List/select local Ollama models")
+    with patcher as mock_select:
+        selected = ui._show_slash_menu()
+
+    assert selected == "/ollama"
+    kwargs = mock_select.call_args.kwargs
+    assert kwargs["use_search_filter"] is True
+    assert kwargs["use_jk_keys"] is False
+    assert kwargs["use_shortcuts"] is False
+
+
+def test_slash_menu_cancel_returns_empty():
+    """Esc (None result) or Ctrl+C returns "" so the prompt loop continues."""
+    ui = RichUI()
+
+    patcher, _ = _select_mock(None)
+    with patcher:
+        assert ui._show_slash_menu() == ""
+
+    with patch("gcode.ui.questionary.select", side_effect=KeyboardInterrupt):
+        assert ui._show_slash_menu() == ""
+
+
+def test_slash_menu_choice_labels_are_searchable():
+    """Choice labels include the command name so a substring match filters.
+
+    The full label is "{cmd}  — {desc}"; filtering on "oll" must keep the
+    /ollama entry (and anything else containing the substring).
+    """
+    labels = [f"{cmd}  — {desc}" for cmd, desc in _SLASH_COMMANDS]
+    filtered = [label for label in labels if "oll" in label.lower()]
+    assert any("/ollama" in label for label in filtered)
+    assert len(filtered) >= 1
+
+
+def test_slash_menu_all_commands_parse_to_first_token():
+    """Every selected label maps back to exactly its command name."""
+    for cmd, desc in _SLASH_COMMANDS:
+        label = f"{cmd}  — {desc}"
+        assert label.split()[0] == cmd