added new module 'openai.py'

chatmastermind/ai.py

@@ -0,0 +1,64 @@
+from dataclasses import dataclass
+from abc import abstractmethod
+from typing import Protocol, Optional, Union
+from .configuration import AIConfig
+from .message import Message
+from .chat import Chat
+
+
+class AIError(Exception):
+    pass
+
+
+@dataclass
+class Tokens:
+    prompt: int = 0
+    completion: int = 0
+    total: int = 0
+
+
+@dataclass
+class AIResponse:
+    """
+    The response to an AI request. Consists of one or more messages
+    (each containing the question and a single answer) and the nr.
+    of used tokens.
+    """
+    messages: list[Message]
+    tokens: Optional[Tokens] = None
+
+
+class AI(Protocol):
+    """
+    The base class for AI clients.
+    """
+
+    name: str
+    config: AIConfig
+
+    @abstractmethod
+    def request(self,
+                question: Message,
+                context: Chat,
+                num_answers: int = 1) -> AIResponse:
+        """
+        Make an AI request, asking the given question with the given
+        context (i. e. chat history). The nr. of requested answers
+        corresponds to the nr. of messages in the 'AIResponse'.
+        """
+        raise NotImplementedError
+
+    @abstractmethod
+    def models(self) -> list[str]:
+        """
+        Return all models supported by this AI.
+        """
+        raise NotImplementedError
+
+    def tokens(self, data: Union[Message, Chat]) -> int:
+        """
+        Computes the nr. of AI language tokens for the given message
+        or chat. Note that the computation may not be 100% accurate
+        and is not implemented for all AIs.
+        """
+        raise NotImplementedError

chatmastermind/ais/openai.py

@@ -0,0 +1,90 @@
+"""
+Implements the OpenAI client classes and functions.
+"""
+import openai
+from typing import Optional
+from ..tags import Tag
+from ..message import Message, Answer
+from ..chat import Chat
+from ..ai import AI, AIResponse, Tokens
+from ..config import OpenAIConfig
+
+ChatType = list[dict[str, str]]
+
+
+class OpenAI(AI):
+    """
+    The OpenAI AI client.
+    """
+
+    config: OpenAIConfig
+
+    def request(self,
+                question: Message,
+                chat: Chat,
+                num_answers: int = 1,
+                otags: Optional[set[Tag]] = None) -> AIResponse:
+        """
+        Make an AI request, asking the given question with the given
+        chat history. The nr. of requested answers corresponds to the
+        nr. of messages in the 'AIResponse'.
+        """
+        oai_chat = self.openai_chat(chat, self.config.system, question)
+        response = openai.ChatCompletion.create(
+            model=self.config.model,
+            messages=oai_chat,
+            temperature=self.config.temperature,
+            max_tokens=self.config.max_tokens,
+            top_p=self.config.top_p,
+            n=num_answers,
+            frequency_penalty=self.config.frequency_penalty,
+            presence_penalty=self.config.presence_penalty)
+        answers: list[Message] = []
+        for choice in response['choices']:  # type: ignore
+            answers.append(Message(question=question.question,
+                                   answer=Answer(choice['message']['content']),
+                                   tags=otags,
+                                   ai=self.name,
+                                   model=self.config.model))
+        return AIResponse(answers, Tokens(response['usage']['prompt'],
+                                          response['usage']['completion'],
+                                          response['usage']['total']))
+
+    def models(self) -> list[str]:
+        """
+        Return all models supported by this AI.
+        """
+        raise NotImplementedError
+
+    def print_models(self) -> None:
+        """
+        Print all models supported by the current AI.
+        """
+        not_ready = []
+        for engine in sorted(openai.Engine.list()['data'], key=lambda x: x['id']):
+            if engine['ready']:
+                print(engine['id'])
+            else:
+                not_ready.append(engine['id'])
+        if len(not_ready) > 0:
+            print('\nNot ready: ' + ', '.join(not_ready))
+
+    def openai_chat(self, chat: Chat, system: str,
+                    question: Optional[Message] = None) -> ChatType:
+        """
+        Create a chat history with system message in OpenAI format.
+        Optionally append a new question.
+        """
+        oai_chat: ChatType = []
+
+        def append(role: str, content: str) -> None:
+            oai_chat.append({'role': role, 'content': content.replace("''", "'")})
+
+        append('system', system)
+        for message in chat.messages:
+            if message.answer:
+                append('user', message.question)
+                append('assistant', message.answer)
+        if question:
+            append('user', question.question)
+        return oai_chat

chatmastermind/chat.py

@@ -7,7 +7,7 @@ from pprint import PrettyPrinter
 from pydoc import pager
 from dataclasses import dataclass
 from typing import TypeVar, Type, Optional, ClassVar, Any, Callable
-from .message import Question, Answer, Message, MessageFilter, MessageError, source_code, message_in
+from .message import Message, MessageFilter, MessageError, message_in
 from .tags import Tag
 
 ChatInst = TypeVar('ChatInst', bound='Chat')
@@ -170,18 +170,10 @@ class Chat:
         output: list[str] = []
         for message in self.messages:
             if source_code_only:
-                output.extend(source_code(message.question, include_delims=True))
+                output.append(message.to_str(source_code_only=True))
                 continue
-            output.append('-' * terminal_width())
+            output.append(message.to_str(with_tags, with_files))
-            if with_tags:
+            output.append('\n' + ('-' * terminal_width()) + '\n')
-                output.append(message.tags_str())
-            if with_files:
-                output.append('FILE: ' + str(message.file_path))
-            output.append(Question.txt_header)
-            output.append(message.question)
-            if message.answer:
-                output.append(Answer.txt_header)
-                output.append(message.answer)
         if paged:
             print_paged('\n'.join(output))
         else:

chatmastermind/main.py

@@ -2,15 +2,16 @@
 # -*- coding: utf-8 -*-
 # vim: set fileencoding=utf-8 :
 
-import yaml
 import sys
 import argcomplete
 import argparse
-import pathlib
+from pathlib import Path
-from .utils import terminal_width, print_tag_args, print_chat_hist, display_source_code, print_tags_frequency, ChatType
+from .utils import terminal_width, print_tag_args, print_chat_hist, ChatType
-from .storage import save_answers, create_chat_hist, get_tags, get_tags_unique, read_file, dump_data
+from .storage import save_answers, create_chat_hist
 from .api_client import ai, openai_api_key, print_models
 from .configuration import Config
+from .chat import ChatDB
+from .message import Message, MessageFilter, MessageError, Question
 from itertools import zip_longest
 from typing import Any
 
@@ -18,9 +19,8 @@ default_config = '.config.yaml'
 
 
 def tags_completer(prefix: str, parsed_args: Any, **kwargs: Any) -> list[str]:
-    with open(parsed_args.config, 'r') as f:
+    config = Config.from_file(parsed_args.config)
-        config = yaml.load(f, Loader=yaml.FullLoader)
+    return list(Message.tags_from_dir(Path(config.db), prefix=prefix))
-    return get_tags_unique(config, prefix)
 
 
 def create_question_with_hist(args: argparse.Namespace,
@@ -30,12 +30,12 @@ def create_question_with_hist(args: argparse.Namespace,
     Creates the "AI request", including the question and chat history as determined
     by the specified tags.
     """
-    tags = args.tags or []
+    tags = args.or_tags or []
-    extags = args.extags or []
+    xtags = args.exclude_tags or []
     otags = args.output_tags or []
 
-    if not args.only_source_code:
+    if not args.source_code_only:
-        print_tag_args(tags, extags, otags)
+        print_tag_args(tags, xtags, otags)
 
     question_parts = []
     question_list = args.question if args.question is not None else []
@@ -52,17 +52,24 @@ def create_question_with_hist(args: argparse.Namespace,
                 question_parts.append(f"```\n{r.read().strip()}\n```")
 
     full_question = '\n\n'.join(question_parts)
-    chat = create_chat_hist(full_question, tags, extags, config,
+    chat = create_chat_hist(full_question, tags, xtags, config,
-                            args.match_all_tags, False, False)
+                            match_all_tags=True if args.and_tags else False,  # FIXME
+                            with_tags=False,
+                            with_file=False)
     return chat, full_question, tags
 
 
-def tag_cmd(args: argparse.Namespace, config: Config) -> None:
+def tags_cmd(args: argparse.Namespace, config: Config) -> None:
     """
-    Handler for the 'tag' command.
+    Handler for the 'tags' command.
     """
+    chat = ChatDB.from_dir(cache_path=Path('.'),
+                           db_path=Path(config.db))
     if args.list:
-        print_tags_frequency(get_tags(config, None))
+        tags_freq = chat.tags_frequency(args.prefix, args.contain)
+        for tag, freq in tags_freq.items():
+            print(f"- {tag}: {freq}")
+    # TODO: add renaming
 
 
 def config_cmd(args: argparse.Namespace, config: Config) -> None:
@@ -78,6 +85,29 @@ def config_cmd(args: argparse.Namespace, config: Config) -> None:
         config.to_file(args.config)
 
 
+def question_cmd(args: argparse.Namespace, config: Config) -> None:
+    """
+    Handler for the 'question' command.
+    """
+    chat = ChatDB.from_dir(cache_path=Path('.'),
+                           db_path=Path(config.db))
+    # if it's a new question, create and store it immediately
+    if args.ask or args.create:
+        message = Message(question=Question(args.question),
+                          tags=args.ouput_tags,  # FIXME
+                          ai=args.ai,
+                          model=args.model)
+        chat.add_to_cache([message])
+    if args.create:
+        return
+    elif args.ask:
+        pass  # TODO
+    elif args.repeat:
+        pass  # TODO
+    elif args.process:
+        pass  # TODO
+
+
 def ask_cmd(args: argparse.Namespace, config: Config) -> None:
     """
     Handler for the 'ask' command.
@@ -89,7 +119,7 @@ def ask_cmd(args: argparse.Namespace, config: Config) -> None:
     if args.model:
         config.openai.model = args.model
     chat, question, tags = create_question_with_hist(args, config)
-    print_chat_hist(chat, False, args.only_source_code)
+    print_chat_hist(chat, False, args.source_code_only)
     otags = args.output_tags or []
     answers, usage = ai(chat, config, args.number)
     save_answers(question, answers, tags, otags, config)
@@ -101,39 +131,38 @@ def hist_cmd(args: argparse.Namespace, config: Config) -> None:
     """
     Handler for the 'hist' command.
     """
-    tags = args.tags or []
-    extags = args.extags or []
 
-    chat = create_chat_hist(None, tags, extags, config,
+    mfilter = MessageFilter(tags_or=args.or_tags,
-                            args.match_all_tags,
+                            tags_and=args.and_tags,
-                            args.with_tags,
+                            tags_not=args.exclude_tags,
-                            args.with_files)
+                            question_contains=args.question,
-    print_chat_hist(chat, args.dump, args.only_source_code)
+                            answer_contains=args.answer)
+    chat = ChatDB.from_dir(Path('.'),
+                           Path(config.db),
+                           mfilter=mfilter)
+    chat.print(args.source_code_only,
+               args.with_tags,
+               args.with_files)
 
 
 def print_cmd(args: argparse.Namespace, config: Config) -> None:
     """
     Handler for the 'print' command.
     """
-    fname = pathlib.Path(args.file)
+    fname = Path(args.file)
-    if fname.suffix == '.yaml':
+    try:
-        with open(args.file, 'r') as f:
+        message = Message.from_file(fname)
-            data = yaml.load(f, Loader=yaml.FullLoader)
+        if message:
-    elif fname.suffix == '.txt':
+            print(message.to_str(source_code_only=args.source_code_only))
-        data = read_file(fname)
+    except MessageError:
-    else:
+        print(f"File is not a valid message: {args.file}")
-        print(f"Unknown file type: {args.file}")
         sys.exit(1)
-    if args.only_source_code:
-        display_source_code(data['answer'])
-    else:
-        print(dump_data(data).strip())
 
 
 def create_parser() -> argparse.ArgumentParser:
     parser = argparse.ArgumentParser(
         description="ChatMastermind is a Python application that automates conversation with AI")
-    parser.add_argument('-c', '--config', help='Config file name.', default=default_config)
+    parser.add_argument('-C', '--config', help='Config file name.', default=default_config)
 
     # subcommand-parser
     cmdparser = parser.add_subparsers(dest='command',
@@ -143,19 +172,38 @@ def create_parser() -> argparse.ArgumentParser:
 
     # a parent parser for all commands that support tag selection
     tag_parser = argparse.ArgumentParser(add_help=False)
-    tag_arg = tag_parser.add_argument('-t', '--tags', nargs='+',
+    tag_arg = tag_parser.add_argument('-t', '--or-tags', nargs='+',
-                                      help='List of tag names', metavar='TAGS')
+                                      help='List of tag names (one must match)', metavar='OTAGS')
     tag_arg.completer = tags_completer  # type: ignore
-    extag_arg = tag_parser.add_argument('-e', '--extags', nargs='+',
+    atag_arg = tag_parser.add_argument('-k', '--and-tags', nargs='+',
-                                        help='List of tag names to exclude', metavar='EXTAGS')
+                                       help='List of tag names (all must match)', metavar='ATAGS')
-    extag_arg.completer = tags_completer  # type: ignore
+    atag_arg.completer = tags_completer  # type: ignore
+    etag_arg = tag_parser.add_argument('-x', '--exclude-tags', nargs='+',
+                                       help='List of tag names to exclude', metavar='XTAGS')
+    etag_arg.completer = tags_completer  # type: ignore
     otag_arg = tag_parser.add_argument('-o', '--output-tags', nargs='+',
-                                       help='List of output tag names, default is input', metavar='OTAGS')
+                                       help='List of output tag names, default is input', metavar='OUTTAGS')
     otag_arg.completer = tags_completer  # type: ignore
-    tag_parser.add_argument('-a', '--match-all-tags',
+
-                            help="All given tags must match when selecting chat history entries",
+    # 'question' command parser
-                            action='store_true')
+    question_cmd_parser = cmdparser.add_parser('question', parents=[tag_parser],
-    # enable autocompletion for tags
+                                               help="ask, create and process questions.",
+                                               aliases=['q'])
+    question_cmd_parser.set_defaults(func=question_cmd)
+    question_group = question_cmd_parser.add_mutually_exclusive_group(required=True)
+    question_group.add_argument('-a', '--ask', nargs='+', help='Ask a question')
+    question_group.add_argument('-c', '--create', nargs='+', help='Create a question')
+    question_group.add_argument('-r', '--repeat', nargs='*', help='Repeat a question')
+    question_group.add_argument('-p', '--process', nargs='*', help='Process existing questions')
+    question_cmd_parser.add_argument('-m', '--max-tokens', help='Max tokens to use', type=int)
+    question_cmd_parser.add_argument('-T', '--temperature', help='Temperature to use', type=float)
+    question_cmd_parser.add_argument('-A', '--AI', help='AI to use')
+    question_cmd_parser.add_argument('-M', '--model', help='Model to use')
+    question_cmd_parser.add_argument('-n', '--number', help='Number of answers to produce', type=int,
+                                     default=1)
+    question_cmd_parser.add_argument('-s', '--source', nargs='+', help='Source add content of a file to the query')
+    question_cmd_parser.add_argument('-S', '--source-code-only', help='Add pure source code to the chat history',
+                                     action='store_true')
 
     # 'ask' command parser
     ask_cmd_parser = cmdparser.add_parser('ask', parents=[tag_parser],
@@ -170,7 +218,7 @@ def create_parser() -> argparse.ArgumentParser:
     ask_cmd_parser.add_argument('-n', '--number', help='Number of answers to produce', type=int,
                                 default=1)
     ask_cmd_parser.add_argument('-s', '--source', nargs='+', help='Source add content of a file to the query')
-    ask_cmd_parser.add_argument('-S', '--only-source-code', help='Add pure source code to the chat history',
+    ask_cmd_parser.add_argument('-S', '--source-code-only', help='Add pure source code to the chat history',
                                 action='store_true')
 
     # 'hist' command parser
@@ -178,23 +226,25 @@ def create_parser() -> argparse.ArgumentParser:
                                            help="Print chat history.",
                                            aliases=['h'])
     hist_cmd_parser.set_defaults(func=hist_cmd)
-    hist_cmd_parser.add_argument('-d', '--dump', help="Print chat history as Python structure",
-                                 action='store_true')
     hist_cmd_parser.add_argument('-w', '--with-tags', help="Print chat history with tags.",
                                  action='store_true')
     hist_cmd_parser.add_argument('-W', '--with-files', help="Print chat history with filenames.",
                                  action='store_true')
-    hist_cmd_parser.add_argument('-S', '--only-source-code', help='Print only source code',
+    hist_cmd_parser.add_argument('-S', '--source-code-only', help='Print only source code',
                                  action='store_true')
+    hist_cmd_parser.add_argument('-A', '--answer', help='Search for answer substring')
+    hist_cmd_parser.add_argument('-Q', '--question', help='Search for question substring')
 
-    # 'tag' command parser
+    # 'tags' command parser
-    tag_cmd_parser = cmdparser.add_parser('tag',
+    tags_cmd_parser = cmdparser.add_parser('tags',
-                                          help="Manage tags.",
+                                           help="Manage tags.",
-                                          aliases=['t'])
+                                           aliases=['t'])
-    tag_cmd_parser.set_defaults(func=tag_cmd)
+    tags_cmd_parser.set_defaults(func=tags_cmd)
-    tag_group = tag_cmd_parser.add_mutually_exclusive_group(required=True)
+    tags_group = tags_cmd_parser.add_mutually_exclusive_group(required=True)
-    tag_group.add_argument('-l', '--list', help="List all tags and their frequency",
+    tags_group.add_argument('-l', '--list', help="List all tags and their frequency",
-                           action='store_true')
+                            action='store_true')
+    tags_cmd_parser.add_argument('-p', '--prefix', help="Filter tags by prefix")
+    tags_cmd_parser.add_argument('-c', '--contain', help="Filter tags by contained substring")
 
     # 'config' command parser
     config_cmd_parser = cmdparser.add_parser('config',
@@ -210,11 +260,11 @@ def create_parser() -> argparse.ArgumentParser:
 
     # 'print' command parser
     print_cmd_parser = cmdparser.add_parser('print',
-                                            help="Print files.",
+                                            help="Print message files.",
                                             aliases=['p'])
     print_cmd_parser.set_defaults(func=print_cmd)
     print_cmd_parser.add_argument('-f', '--file', help='File to print', required=True)
-    print_cmd_parser.add_argument('-S', '--only-source-code', help='Print only source code',
+    print_cmd_parser.add_argument('-S', '--source-code-only', help='Print source code only (from the answer, if available)',
                                   action='store_true')
 
     argcomplete.autocomplete(parser)

chatmastermind/message.py

@@ -392,6 +392,30 @@ class Message():
             data[cls.file_yaml_key] = file_path
             return cls.from_dict(data)
 
+    def to_str(self, with_tags: bool = False, with_file: bool = False, source_code_only: bool = False) -> str:
+        """
+        Return the current Message as a string.
+        """
+        output: list[str] = []
+        if source_code_only:
+            # use the source code from answer only
+            if self.answer:
+                output.extend(self.answer.source_code(include_delims=True))
+            return '\n'.join(output) if len(output) > 0 else ''
+        if with_tags:
+            output.append(self.tags_str())
+        if with_file:
+            output.append('FILE: ' + str(self.file_path))
+        output.append(Question.txt_header)
+        output.append(self.question)
+        if self.answer:
+            output.append(Answer.txt_header)
+            output.append(self.answer)
+        return '\n'.join(output)
+
+    def __str__(self) -> str:
+        return self.to_str(False, False, False)
+
     def to_file(self, file_path: Optional[pathlib.Path]=None) -> None:  # noqa: 11
         """
         Write a Message to the given file. Type is determined based on the suffix.

chatmastermind/utils.py

@@ -78,8 +78,3 @@ def print_chat_hist(chat: ChatType, dump: bool = False, source_code: bool = Fals
             print(message['content'])
         else:
             print(f"{message['role'].upper()}: {message['content']}")
-
-
-def print_tags_frequency(tags: list[str]) -> None:
-    for tag in sorted(set(tags)):
-        print(f"- {tag}: {tags.count(tag)}")

tests/test_chat.py

@@ -66,16 +66,20 @@ class TestChat(CmmTestCase):
     def test_print(self, mock_stdout: StringIO) -> None:
         self.chat.add_messages([self.message1, self.message2])
         self.chat.print(paged=False)
-        expected_output = f"""{'-'*terminal_width()}
+        expected_output = f"""{Question.txt_header}
-{Question.txt_header}
 Question 1
 {Answer.txt_header}
 Answer 1
+
 {'-'*terminal_width()}
+
 {Question.txt_header}
 Question 2
 {Answer.txt_header}
 Answer 2
+
+{'-'*terminal_width()}
+
 """
         self.assertEqual(mock_stdout.getvalue(), expected_output)
 
@@ -83,20 +87,24 @@ Answer 2
     def test_print_with_tags_and_file(self, mock_stdout: StringIO) -> None:
         self.chat.add_messages([self.message1, self.message2])
         self.chat.print(paged=False, with_tags=True, with_files=True)
-        expected_output = f"""{'-'*terminal_width()}
+        expected_output = f"""{TagLine.prefix} atag1 btag2
-{TagLine.prefix} atag1 btag2
 FILE: 0001.txt
 {Question.txt_header}
 Question 1
 {Answer.txt_header}
 Answer 1
+
 {'-'*terminal_width()}
+
 {TagLine.prefix} btag2
 FILE: 0002.txt
 {Question.txt_header}
 Question 2
 {Answer.txt_header}
 Answer 2
+
+{'-'*terminal_width()}
+
 """
         self.assertEqual(mock_stdout.getvalue(), expected_output)
 

tests/test_main.py

@@ -114,12 +114,13 @@ class TestHandleQuestion(CmmTestCase):
     def setUp(self) -> None:
         self.question = "test question"
         self.args = argparse.Namespace(
-            tags=['tag1'],
+            or_tags=['tag1'],
-            extags=['extag1'],
+            and_tags=None,
+            exclude_tags=['xtag1'],
             output_tags=None,
             question=[self.question],
             source=None,
-            only_source_code=False,
+            source_code_only=False,
             number=3,
             max_tokens=None,
             temperature=None,
@@ -142,17 +143,19 @@ class TestHandleQuestion(CmmTestCase):
         open_mock = MagicMock()
         with patch("chatmastermind.storage.open", open_mock):
             ask_cmd(self.args, self.config)
-            mock_print_tag_args.assert_called_once_with(self.args.tags,
+            mock_print_tag_args.assert_called_once_with(self.args.or_tags,
-                                                        self.args.extags,
+                                                        self.args.exclude_tags,
                                                         [])
             mock_create_chat_hist.assert_called_once_with(self.question,
-                                                          self.args.tags,
+                                                          self.args.or_tags,
-                                                          self.args.extags,
+                                                          self.args.exclude_tags,
                                                           self.config,
-                                                          False, False, False)
+                                                          match_all_tags=False,
+                                                          with_tags=False,
+                                                          with_file=False)
             mock_print_chat_hist.assert_called_once_with('test_chat',
                                                          False,
-                                                         self.args.only_source_code)
+                                                         self.args.source_code_only)
             mock_ai.assert_called_with("test_chat",
                                        self.config,
                                        self.args.number)
@@ -227,7 +230,7 @@ class TestCreateParser(CmmTestCase):
             mock_add_subparsers.assert_called_once_with(dest='command', title='commands', description='supported commands', required=True)
             mock_cmdparser.add_parser.assert_any_call('ask', parents=ANY, help=ANY, aliases=ANY)
             mock_cmdparser.add_parser.assert_any_call('hist', parents=ANY, help=ANY, aliases=ANY)
-            mock_cmdparser.add_parser.assert_any_call('tag', help=ANY, aliases=ANY)
+            mock_cmdparser.add_parser.assert_any_call('tags', help=ANY, aliases=ANY)
             mock_cmdparser.add_parser.assert_any_call('config', help=ANY, aliases=ANY)
             mock_cmdparser.add_parser.assert_any_call('print', help=ANY, aliases=ANY)
             self.assertTrue('.config.yaml' in parser.get_default('config'))

tests/test_message.py

@@ -804,3 +804,27 @@ class MessageRenameTagsTestCase(CmmTestCase):
         self.message.rename_tags({(Tag('atag1'), Tag('atag2')), (Tag('btag2'), Tag('btag3'))})
         self.assertIsNotNone(self.message.tags)
         self.assertSetEqual(self.message.tags, {Tag('atag2'), Tag('btag3')})  # type: ignore [arg-type]
+
+
+class MessageToStrTestCase(CmmTestCase):
+    def setUp(self) -> None:
+        self.message = Message(Question('This is a question.'),
+                               Answer('This is an answer.'),
+                               tags={Tag('atag1'), Tag('btag2')},
+                               file_path=pathlib.Path('/tmp/foo/bla'))
+
+    def test_to_str(self) -> None:
+        expected_output = f"""{Question.txt_header}
+This is a question.
+{Answer.txt_header}
+This is an answer."""
+        self.assertEqual(self.message.to_str(), expected_output)
+
+    def test_to_str_with_tags_and_file(self) -> None:
+        expected_output = f"""{TagLine.prefix} atag1 btag2
+FILE: /tmp/foo/bla
+{Question.txt_header}
+This is a question.
+{Answer.txt_header}
+This is an answer."""
+        self.assertEqual(self.message.to_str(with_tags=True, with_file=True), expected_output)