Add placeholder parameter support to confirm prompt

questionary/prompts/confirm.py

@@ -23,6 +23,7 @@ def confirm(
     style: Optional[Style] = None,
     auto_enter: bool = True,
     instruction: Optional[str] = None,
+    placeholder: Optional[str] = None,
     **kwargs: Any,
 ) -> Question:
     """A yes or no question. The user can either confirm or deny.
@@ -61,6 +62,10 @@ def confirm(
 
         instruction: A message describing how to proceed through the
                      confirmation prompt.
+
+        placeholder: Optional placeholder text shown when no answer is selected.
+                    The placeholder text will disappear once the user presses a key.
+
     Returns:
         :class:`Question`: Question instance, ready to be prompted (using `.ask()`).
     """
@@ -83,6 +88,8 @@ def get_prompt_tokens():
         if status["answer"] is not None:
             answer = YES if status["answer"] else NO
             tokens.append(("class:answer", answer))
+        elif placeholder is not None and not status["complete"]:
+            tokens.append(("class:placeholder", placeholder))
 
         return to_formatted_text(tokens)
 

tests/prompts/test_confirm.py

@@ -101,3 +101,25 @@ def test_confirm_instruction():
         "confirm", message, text, instruction="Foo instruction"
     )
     assert result is True
+
+
+def test_confirm_placeholder():
+    message = "Foo message"
+    text = "Y" + "\r"
+    placeholder = "This is a placeholder"
+
+    result, cli = feed_cli_with_input(
+        "confirm", message, text, placeholder=placeholder
+    )
+    assert result is True
+
+
+def test_confirm_placeholder_disappears_on_input():
+    message = "Foo message"
+    text = "n" + KeyInputs.ENTER + "\r"
+    placeholder = "This should disappear"
+
+    result, cli = feed_cli_with_input(
+        "confirm", message, text, auto_enter=False, placeholder=placeholder
+    )
+    assert result is False