question_cmd: fixed '--create' option

This PR primarily modifies the `cmm question --repeat` command to allow repeating multiple questions, instead of only the last one.

Additionally, this PR includes the following changes:

- In `ai_factory.py`, added optional parameters 'def_ai' and 'def_model' to the `create_ai` function which allows specifying a default AI and model.
- In `openai.py`, a potential bug was fixed where the 'tags' attribute was updated to ensure it is always a set, even when 'otags' is None.
- In `question.py`, a significant amount of new code was added to facilitate the 'repeat' functionality. This includes functions to create modified args based on an existing message (`create_msg_args`), to repeat a given list of messages (`repeat_messages`), and to invert the semantics of the INPUT tags for this command (`invert_input_tag_args`).
- In `main.py`, the 'nargs' parameter was changed from `+` to `*` in the 'or-tags', 'and-tags', and 'exclude-tags' arguments to accommodate the updated handling of tags in `question.py`.
- A new `test_common.py` file was added which includes a `FakeAI` class for testing purposes, and a `TestWithFakeAI` class which includes a number of methods for asserting various conditions about messages.

This PR also includes additional tests to verify the correct operation of the new 'repeat' functionality.

chatmastermind/commands/question.py

@@ -10,6 +10,10 @@ from ..ai_factory import create_ai
 from ..ai import AI, AIResponse
 
 
+class QuestionCmdError(Exception):
+    pass
+
+
 def add_file_as_text(question_parts: list[str], file: str) -> None:
     """
     Add the given file as plain text to the question part list.
@@ -57,7 +61,12 @@ def create_message(chat: ChatDB, args: argparse.Namespace) -> Message:
     to the cache directory.
     """
     question_parts = []
-    question_list = args.ask if args.ask is not None else []
+    if args.create is not None:
+        question_list = args.create
+    elif args.ask is not None:
+        question_list = args.ask
+    else:
+        raise QuestionCmdError("No question found")
     text_files = args.source_text if args.source_text is not None else []
     code_files = args.source_code if args.source_code is not None else []
 

tests/test_question_cmd.py

@@ -38,6 +38,8 @@ class TestMessageCreate(TestWithFakeAI):
         self.args.AI = None
         self.args.model = None
         self.args.output_tags = None
+        self.args.ask = None
+        self.args.create = None
         # File 1 : no source code block, only text
         self.source_file1 = tempfile.NamedTemporaryFile(delete=False)
         self.source_file1_content = """This is just text.
@@ -201,6 +203,21 @@ It is embedded code
 """))
 
 
+class TestCreateOption(TestMessageCreate):
+
+    def test_message_file_created(self) -> None:
+        self.args.create = ["How does question --create work?"]
+        self.args.ask = None
+        cache_dir_files = self.message_list(self.cache_dir)
+        self.assertEqual(len(cache_dir_files), 0)
+        create_message(self.chat, self.args)
+        cache_dir_files = self.message_list(self.cache_dir)
+        self.assertEqual(len(cache_dir_files), 1)
+        message = Message.from_file(cache_dir_files[0])
+        self.assertIsInstance(message, Message)
+        self.assertEqual(message.question, Question("How does question --create work?"))  # type: ignore [union-attr]
+
+
 class TestQuestionCmd(TestWithFakeAI):
 
     def setUp(self) -> None: