Cancel commands by entering a blank command or ^C

babi.py

@@ -174,6 +174,8 @@ class Status:
             elif isinstance(key.wch, str) and key.wch.isprintable():
                 buf = buf[:pos] + key.wch + buf[pos:]
                 pos += 1
+            elif key.keyname == b'^C':
+                return ''
             elif key.key == ord('\r'):
                 return buf
 
@@ -610,11 +612,11 @@ def _edit(screen: Screen) -> EditResult:
                 return EditResult.EXIT
             elif response == ':w':
                 screen.file.save(screen.status, screen.margin)
+            elif response == '':  # noop / cancel
+                screen.status.update('', screen.margin)
             else:
-                screen.status.update(
-                    f'{response} is not a valid command.',
-                    screen.margin,
-                )
+                msg = f'invalid command: {response}'
+                screen.status.update(msg, screen.margin)
         elif key.keyname == b'^S':
             screen.file.save(screen.status, screen.margin)
         elif key.keyname == b'^X':

tests/babi_test.py

@@ -949,3 +949,31 @@ def test_resizing_and_scrolling_in_command_mode():
             h.await_text(f'\n{"b" * 15}\n')
 
         h.press('Enter')
+
+
+def test_invalid_command():
+    with run() as h, and_exit(h):
+        trigger_command_mode(h)
+        h.press_and_enter(':fake')
+        h.await_text('invalid command: :fake')
+
+
+def test_empty_command_is_noop():
+    with run() as h, and_exit(h):
+        h.press('hello ')
+        trigger_command_mode(h)
+        h.press('Enter')
+        h.press('world')
+        h.await_text('hello world')
+        h.await_text_missing('invalid command')
+
+
+def test_cancel_command_mode():
+    with run() as h, and_exit(h):
+        h.press('hello ')
+        trigger_command_mode(h)
+        h.press(':q')
+        h.press('^C')
+        h.press('world')
+        h.await_text('hello world')
+        h.await_text_missing('invalid command')