hist_cmd: startet to implement '--convert'

- no longer using file suffix to choose the format
- added 'mformat' argument to 'write_xxx()' functions
- file suffix is now set by 'Message.to_file()' per default

chatmastermind/chat.py

@@ -6,9 +6,9 @@ from pathlib import Path
 from pprint import PrettyPrinter
 from pydoc import pager
 from dataclasses import dataclass
-from typing import TypeVar, Type, Optional, ClassVar, Any, Callable, Literal, Union
+from typing import TypeVar, Type, Optional, Any, Callable, Literal, Union
 from .configuration import default_config_file
-from .message import Message, MessageFilter, MessageError, message_in
+from .message import Message, MessageFilter, MessageError, MessageFormat, message_in, message_valid_formats
 from .tags import Tag
 
 ChatInst = TypeVar('ChatInst', bound='Chat')
@@ -17,6 +17,7 @@ ChatDBInst = TypeVar('ChatDBInst', bound='ChatDB')
 db_next_file = '.next'
 ignored_files = [db_next_file, default_config_file]
 msg_location = Literal['mem', 'disk', 'cache', 'db', 'all']
+msg_suffix = Message.file_suffix_write
 
 
 class ChatError(Exception):
@@ -52,7 +53,7 @@ def read_dir(dir_path: Path,
     for file_path in sorted(file_iter):
         if (file_path.is_file()
            and file_path.name not in ignored_files  # noqa: W503
-           and file_path.suffix in Message.file_suffixes):  # noqa: W503
+           and file_path.suffix in Message.file_suffixes_read):  # noqa: W503
             try:
                 message = Message.from_file(file_path, mfilter)
                 if message:
@@ -63,22 +64,20 @@ def read_dir(dir_path: Path,
 
 
 def make_file_path(dir_path: Path,
-                   file_suffix: str,
                    next_fid: Callable[[], int]) -> Path:
     """
-    Create a file_path for the given directory using the
+    Create a file_path for the given directory using the given ID generator function.
-    given file_suffix and ID generator function.
     """
-    file_path = dir_path / f"{next_fid():04d}{file_suffix}"
+    file_path = dir_path / f"{next_fid():04d}{msg_suffix}"
     while file_path.exists():
-        file_path = dir_path / f"{next_fid():04d}{file_suffix}"
+        file_path = dir_path / f"{next_fid():04d}{msg_suffix}"
     return file_path
 
 
 def write_dir(dir_path: Path,
               messages: list[Message],
-              file_suffix: str,
+              next_fid: Callable[[], int],
-              next_fid: Callable[[], int]) -> None:
+              mformat: MessageFormat = Message.default_format) -> None:
     """
     Write all messages to the given directory. If a message has no file_path,
     a new one will be created. If message.file_path exists, it will be modified
@@ -86,18 +85,17 @@ def write_dir(dir_path: Path,
     Parameters:
     * 'dir_path': destination directory
     * 'messages': list of messages to write
-    * 'file_suffix': suffix for the message files ['.txt'|'.yaml']
     * 'next_fid': callable that returns the next file ID
     """
     for message in messages:
         file_path = message.file_path
         # message has no file_path: create one
         if not file_path:
-            file_path = make_file_path(dir_path, file_suffix, next_fid)
+            file_path = make_file_path(dir_path, next_fid)
         # file_path does not point to given directory: modify it
         elif not file_path.parent.samefile(dir_path):
             file_path = dir_path / file_path.name
-        message.to_file(file_path)
+        message.to_file(file_path, mformat=mformat)
 
 
 def clear_dir(dir_path: Path,
@@ -109,7 +107,7 @@ def clear_dir(dir_path: Path,
     for file_path in file_iter:
         if (file_path.is_file()
            and file_path.name not in ignored_files  # noqa: W503
-           and file_path.suffix in Message.file_suffixes):  # noqa: W503
+           and file_path.suffix in Message.file_suffixes_read):  # noqa: W503
             file_path.unlink(missing_ok=True)
 
 
@@ -146,7 +144,7 @@ class Chat:
         Matching is True if:
         * 'name' matches the full 'file_path'
         * 'name' matches 'file_path.name' (i. e. including the suffix)
-        * 'name' matches 'file_path.stem' (i. e. without a suffix)
+        * 'name' matches 'file_path.stem' (i. e. without the suffix)
         """
         return Path(name) == file_path or name == file_path.name or name == file_path.stem
 
@@ -281,15 +279,14 @@ class ChatDB(Chat):
     persistently.
     """
 
-    default_file_suffix: ClassVar[str] = '.txt'
-
     cache_path: Path
     db_path: Path
     # a MessageFilter that all messages must match (if given)
     mfilter: Optional[MessageFilter] = None
-    file_suffix: str = default_file_suffix
     # the glob pattern for all messages
     glob: Optional[str] = None
+    # message format (for writing)
+    mformat: MessageFormat = Message.default_format
 
     def __post_init__(self) -> None:
         # contains the latest message ID
@@ -317,8 +314,7 @@ class ChatDB(Chat):
           when reading them.
         """
         messages = read_dir(db_path, glob, mfilter)
-        return cls(messages, cache_path, db_path, mfilter,
+        return cls(messages, cache_path, db_path, mfilter, glob)
-                   cls.default_file_suffix, glob)
 
     @classmethod
     def from_messages(cls: Type[ChatDBInst],
@@ -345,7 +341,17 @@ class ChatDB(Chat):
         with open(self.next_path, 'w') as f:
             f.write(f'{fid}')
 
-    def msg_write(self, messages: Optional[list[Message]] = None) -> None:
+    def set_msg_format(self, mformat: MessageFormat) -> None:
+        """
+        Set message format for writing messages.
+        """
+        if mformat not in message_valid_formats:
+            raise ChatError(f"Message format '{mformat}' is not supported")
+        self.mformat = mformat
+
+    def msg_write(self,
+                  messages: Optional[list[Message]] = None,
+                  mformat: Optional[MessageFormat] = None) -> None:
         """
         Write either the given messages or the internal ones to their CURRENT file_path.
         If messages are given, they all must have a valid file_path. When writing the
@@ -356,7 +362,7 @@ class ChatDB(Chat):
             raise ChatError("Can't write files without a valid file_path")
         msgs = iter(messages if messages else self.messages)
         while (m := next(msgs, None)):
-            m.to_file()
+            m.to_file(mformat=mformat if mformat else self.mformat)
 
     def msg_update(self, messages: list[Message], write: bool = True) -> None:
         """
@@ -377,6 +383,7 @@ class ChatDB(Chat):
     def msg_gather(self,
                    loc: msg_location,
                    require_file_path: bool = False,
+                   glob: Optional[str] = None,
                    mfilter: Optional[MessageFilter] = None) -> list[Message]:
         """
         Gather and return messages from the given locations:
@@ -395,9 +402,9 @@ class ChatDB(Chat):
             else:
                 loc_messages += [m for m in self.messages if (mfilter is None or m.match(mfilter))]
         if loc in ['cache', 'disk', 'all']:
-            loc_messages += read_dir(self.cache_path, mfilter=mfilter)
+            loc_messages += read_dir(self.cache_path, glob=glob, mfilter=mfilter)
         if loc in ['db', 'disk', 'all']:
-            loc_messages += read_dir(self.db_path, mfilter=mfilter)
+            loc_messages += read_dir(self.db_path, glob=glob, mfilter=mfilter)
         # remove_duplicates and sort the list
         unique_messages: list[Message] = []
         for m in loc_messages:
@@ -518,8 +525,8 @@ class ChatDB(Chat):
         """
         write_dir(self.cache_path,
                   messages if messages else self.messages,
-                  self.file_suffix,
+                  self.get_next_fid,
-                  self.get_next_fid)
+                  self.mformat)
 
     def cache_add(self, messages: list[Message], write: bool = True) -> None:
         """
@@ -531,11 +538,11 @@ class ChatDB(Chat):
         if write:
             write_dir(self.cache_path,
                       messages,
-                      self.file_suffix,
+                      self.get_next_fid,
-                      self.get_next_fid)
+                      self.mformat)
         else:
             for m in messages:
-                m.file_path = make_file_path(self.cache_path, self.default_file_suffix, self.get_next_fid)
+                m.file_path = make_file_path(self.cache_path, self.get_next_fid)
         self.messages += messages
         self.msg_sort()
 
@@ -585,8 +592,8 @@ class ChatDB(Chat):
         """
         write_dir(self.db_path,
                   messages if messages else self.messages,
-                  self.file_suffix,
+                  self.get_next_fid,
-                  self.get_next_fid)
+                  self.mformat)
 
     def db_add(self, messages: list[Message], write: bool = True) -> None:
         """
@@ -598,11 +605,11 @@ class ChatDB(Chat):
         if write:
             write_dir(self.db_path,
                       messages,
-                      self.file_suffix,
+                      self.get_next_fid,
-                      self.get_next_fid)
+                      self.mformat)
         else:
             for m in messages:
-                m.file_path = make_file_path(self.db_path, self.default_file_suffix, self.get_next_fid)
+                m.file_path = make_file_path(self.db_path, self.get_next_fid)
         self.messages += messages
         self.msg_sort()
 

chatmastermind/commands/hist.py

@@ -2,7 +2,26 @@ import argparse
 from pathlib import Path
 from ..configuration import Config
 from ..chat import ChatDB
-from ..message import MessageFilter
+from ..message import MessageFilter, Message
+
+
+msg_suffix = Message.file_suffix_write
+
+
+def convert(args: argparse.Namespace, config: Config) -> None:
+    """
+    Convert messages to a new format. Also used to change the suffix,
+    to the latest default message file suffix.
+    """
+    chat = ChatDB.from_dir(Path(config.cache),
+                           Path(config.db))
+    # read all known message files
+    msgs = chat.msg_gather(loc='disk', glob='*.*')
+    # make a set of all message IDs
+    # msg_ids = set([m.msg_id() for m in msgs])
+    # set requested format and write all messages
+    chat.set_msg_format(args.format)
+    chat.msg_write(msgs)
 
 
 def hist_cmd(args: argparse.Namespace, config: Config) -> None:

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.
@@ -51,13 +55,41 @@ def add_file_as_code(question_parts: list[str], file: str) -> None:
         question_parts.append(f"```\n{content}\n```")
 
 
+def create_msg_args(msg: Message, args: argparse.Namespace) -> argparse.Namespace:
+    """
+    Takes an existing message and CLI arguments, and returns modified args based
+    on the members of the given message. Used e.g. when repeating messages, where
+    it's necessary to determine the correct AI, module and output tags to use
+    (either from the existing message or the given args).
+    """
+    msg_args = args
+    # if AI, model or output tags have not been specified,
+    # use those from the original message
+    if (args.AI is None
+       or args.model is None  # noqa: W503
+       or args.output_tags is None):  # noqa: W503
+        msg_args = deepcopy(args)
+        if args.AI is None and msg.ai is not None:
+            msg_args.AI = msg.ai
+        if args.model is None and msg.model is not None:
+            msg_args.model = msg.model
+        if args.output_tags is None and msg.tags is not None:
+            msg_args.output_tags = msg.tags
+    return msg_args
+
+
 def create_message(chat: ChatDB, args: argparse.Namespace) -> Message:
     """
     Create a new message from the given arguments and write it
     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 []
 
@@ -106,29 +138,6 @@ def make_request(ai: AI, chat: ChatDB, message: Message, args: argparse.Namespac
         print(response.tokens)
 
 
-def create_msg_args(msg: Message, args: argparse.Namespace) -> argparse.Namespace:
-    """
-    Takes an existing message and CLI arguments, and returns modified args based
-    on the members of the given message. Used e.g. when repeating messages, where
-    it's necessary to determine the correct AI, module and output tags to use
-    (either from the existing message or the given args).
-    """
-    msg_args = args
-    # if AI, model or output tags have not been specified,
-    # use those from the original message
-    if (args.AI is None
-       or args.model is None  # noqa: W503
-       or args.output_tags is None):  # noqa: W503
-        msg_args = deepcopy(args)
-        if args.AI is None and msg.ai is not None:
-            msg_args.AI = msg.ai
-        if args.model is None and msg.model is not None:
-            msg_args.model = msg.model
-        if args.output_tags is None and msg.tags is not None:
-            msg_args.output_tags = msg.tags
-    return msg_args
-
-
 def repeat_messages(messages: list[Message], chat: ChatDB, args: argparse.Namespace, config: Config) -> None:
     """
     Repeat the given messages using the given arguments.

chatmastermind/message.py

@@ -5,7 +5,8 @@ import pathlib
 import yaml
 import tempfile
 import shutil
-from typing import Type, TypeVar, ClassVar, Optional, Any, Union, Final, Literal, Iterable
+from typing import Type, TypeVar, ClassVar, Optional, Any, Union, Final, Literal, Iterable, Tuple
+from typing import get_args as typing_get_args
 from dataclasses import dataclass, asdict, field
 from .tags import Tag, TagLine, TagError, match_tags, rename_tags
 
@@ -15,6 +16,9 @@ MessageInst = TypeVar('MessageInst', bound='Message')
 AILineInst = TypeVar('AILineInst', bound='AILine')
 ModelLineInst = TypeVar('ModelLineInst', bound='ModelLine')
 YamlDict = dict[str, Union[QuestionInst, AnswerInst, set[Tag]]]
+MessageFormat = Literal['txt', 'yaml']
+message_valid_formats: Final[Tuple[MessageFormat, ...]] = typing_get_args(MessageFormat)
+message_default_format: Final[MessageFormat] = 'txt'
 
 
 class MessageError(Exception):
@@ -92,7 +96,7 @@ class MessageFilter:
 
 class AILine(str):
     """
-    A line that represents the AI name in a '.txt' file..
+    A line that represents the AI name in the 'txt' format.
     """
     prefix: Final[str] = 'AI:'
 
@@ -112,7 +116,7 @@ class AILine(str):
 
 class ModelLine(str):
     """
-    A line that represents the model name in a '.txt' file..
+    A line that represents the model name in the 'txt' format.
     """
     prefix: Final[str] = 'MODEL:'
 
@@ -216,7 +220,9 @@ class Message():
     model: Optional[str] = field(default=None, compare=False)
     file_path: Optional[pathlib.Path] = field(default=None, compare=False)
     # class variables
-    file_suffixes: ClassVar[list[str]] = ['.txt', '.yaml']
+    file_suffixes_read: ClassVar[list[str]] = ['.msg', '.txt', '.yaml']
+    file_suffix_write: ClassVar[str] = '.msg'
+    default_format: ClassVar[MessageFormat] = message_default_format
     tags_yaml_key: ClassVar[str] = 'tags'
     file_yaml_key: ClassVar[str] = 'file_path'
     ai_yaml_key: ClassVar[str] = 'ai'
@@ -276,24 +282,16 @@ class Message():
         tags: set[Tag] = set()
         if not file_path.exists():
             raise MessageError(f"Message file '{file_path}' does not exist")
-        if file_path.suffix not in cls.file_suffixes:
+        if file_path.suffix not in cls.file_suffixes_read:
             raise MessageError(f"File type '{file_path.suffix}' is not supported")
-        # for TXT, it's enough to read the TagLine
+        try:
-        if file_path.suffix == '.txt':
+            message = cls.from_file(file_path)
-            with open(file_path, "r") as fd:
+            if message:
-                try:
+                msg_tags = message.filter_tags(prefix=prefix, contain=contain)
-                    tags = TagLine(fd.readline()).tags(prefix, contain)
+        except MessageError as e:
-                except TagError:
+            print(f"Error processing message in '{file_path}': {str(e)}")
-                    pass  # message without tags
+        if msg_tags:
-        else:  # '.yaml'
+            tags = msg_tags
-            try:
-                message = cls.from_file(file_path)
-                if message:
-                    msg_tags = message.filter_tags(prefix=prefix, contain=contain)
-            except MessageError as e:
-                print(f"Error processing message in '{file_path}': {str(e)}")
-            if msg_tags:
-                tags = msg_tags
         return tags
 
     @classmethod
@@ -328,15 +326,16 @@ class Message():
         """
         if not file_path.exists():
             raise MessageError(f"Message file '{file_path}' does not exist")
-        if file_path.suffix not in cls.file_suffixes:
+        if file_path.suffix not in cls.file_suffixes_read:
             raise MessageError(f"File type '{file_path.suffix}' is not supported")
-
+        # try TXT first
-        if file_path.suffix == '.txt':
+        try:
             message = cls.__from_file_txt(file_path,
                                           mfilter.tags_or if mfilter else None,
                                           mfilter.tags_and if mfilter else None,
                                           mfilter.tags_not if mfilter else None)
-        else:
+        # then YAML
+        except MessageError:
             message = cls.__from_file_yaml(file_path)
         if message and (mfilter is None or message.match(mfilter)):
             return message
@@ -373,10 +372,6 @@ class Message():
                 tags = TagLine(fd.readline()).tags()
             except TagError:
                 fd.seek(pos)
-            if tags_or or tags_and or tags_not:
-                # match with an empty set if the file has no tags
-                if not match_tags(tags, tags_or, tags_and, tags_not):
-                    return None
             # AILine (Optional)
             try:
                 pos = fd.tell()
@@ -391,17 +386,23 @@ class Message():
                 fd.seek(pos)
             # Question and Answer
             text = fd.read().strip().split('\n')
-            try:
+        try:
-                question_idx = text.index(Question.txt_header) + 1
+            question_idx = text.index(Question.txt_header) + 1
-            except ValueError:
+        except ValueError:
-                raise MessageError(f"'{file_path}' does not contain a valid message")
+            raise MessageError(f"'{file_path}' does not contain a valid message")
-            try:
+        try:
-                answer_idx = text.index(Answer.txt_header)
+            answer_idx = text.index(Answer.txt_header)
-                question = Question.from_list(text[question_idx:answer_idx])
+            question = Question.from_list(text[question_idx:answer_idx])
-                answer = Answer.from_list(text[answer_idx + 1:])
+            answer = Answer.from_list(text[answer_idx + 1:])
-            except ValueError:
+        except ValueError:
-                question = Question.from_list(text[question_idx:])
+            question = Question.from_list(text[question_idx:])
-            return cls(question, answer, tags, ai, model, file_path)
+        # match tags AFTER reading the whole file
+        # -> make sure it's a valid 'txt' file format
+        if tags_or or tags_and or tags_not:
+            # match with an empty set if the file has no tags
+            if not match_tags(tags, tags_or, tags_and, tags_not):
+                return None
+        return cls(question, answer, tags, ai, model, file_path)
 
     @classmethod
     def __from_file_yaml(cls: Type[MessageInst], file_path: pathlib.Path) -> MessageInst:
@@ -442,21 +443,29 @@ class Message():
             output.append(self.answer)
         return '\n'.join(output)
 
-    def to_file(self, file_path: Optional[pathlib.Path]=None) -> None:  # noqa: 11
+    def to_file(self, file_path: Optional[pathlib.Path]=None, mformat: MessageFormat = message_default_format) -> None:  # noqa: 11
         """
-        Write a Message to the given file. Type is determined based on the suffix.
+        Write a Message to the given file. Supported message file formats are 'txt' and 'yaml'.
-        Currently supported suffixes: ['.txt', '.yaml']
+        Suffix is always '.msg'.
         """
         if file_path:
             self.file_path = file_path
         if not self.file_path:
             raise MessageError("Got no valid path to write message")
-        if self.file_path.suffix not in self.file_suffixes:
+        if mformat not in message_valid_formats:
-            raise MessageError(f"File type '{self.file_path.suffix}' is not supported")
+            raise MessageError(f"File format '{mformat}' is not supported")
+        # check for valid suffix
+        # -> add one if it's empty
+        # -> refuse old or otherwise unsupported suffixes
+        if not self.file_path.suffix:
+            self.file_path = self.file_path.with_suffix(self.file_suffix_write)
+        elif self.file_path.suffix != self.file_suffix_write:
+            raise MessageError(f"File suffix '{self.file_path.suffix}' is not supported")
         # TXT
-        if self.file_path.suffix == '.txt':
+        if mformat == 'txt':
             return self.__to_file_txt(self.file_path)
-        elif self.file_path.suffix == '.yaml':
+        # YAML
+        elif mformat == 'yaml':
             return self.__to_file_yaml(self.file_path)
 
     def __to_file_txt(self, file_path: pathlib.Path) -> None:
@@ -468,8 +477,8 @@ class Message():
             * Model [Optional]
             * Question.txt_header
             * Question
-            * Answer.txt_header
+            * Answer.txt_header [Optional]
-            * Answer
+            * Answer [Optional]
         """
         with tempfile.NamedTemporaryFile(dir=file_path.parent, prefix=file_path.name, mode="w", delete=False) as temp_fd:
             temp_file_path = pathlib.Path(temp_fd.name)
@@ -508,6 +517,13 @@ class Message():
             yaml.dump(data, temp_fd, sort_keys=False)
         shutil.move(temp_file_path, file_path)
 
+    def rm_file(self) -> None:
+        """
+        Delete the message file. Ignore empty file_path and not existing files.
+        """
+        if self.file_path is not None:
+            self.file_path.unlink(missing_ok=True)
+
     def filter_tags(self, prefix: Optional[str] = None, contain: Optional[str] = None) -> set[Tag]:
         """
         Filter tags based on their prefix (i. e. the tag starts with a given string)

tests/test_chat.py

@@ -10,6 +10,20 @@ from chatmastermind.message import Message, Question, Answer, Tag, MessageFilter
 from chatmastermind.chat import Chat, ChatDB, ChatError
 
 
+msg_suffix: str = Message.file_suffix_write
+
+
+def msg_to_file_force_suffix(msg: Message) -> None:
+    """
+    Force writing a message file with illegal suffixes.
+    """
+    def_suffix = Message.file_suffix_write
+    assert msg.file_path
+    Message.file_suffix_write = msg.file_path.suffix
+    msg.to_file()
+    Message.file_suffix_write = def_suffix
+
+
 class TestChatBase(unittest.TestCase):
     def assert_messages_equal(self, msg1: list[Message], msg2: list[Message]) -> None:
         """
@@ -27,11 +41,11 @@ class TestChat(TestChatBase):
         self.message1 = Message(Question('Question 1'),
                                 Answer('Answer 1'),
                                 {Tag('atag1'), Tag('btag2')},
-                                file_path=pathlib.Path('0001.txt'))
+                                file_path=pathlib.Path(f'0001{msg_suffix}'))
         self.message2 = Message(Question('Question 2'),
                                 Answer('Answer 2'),
                                 {Tag('btag2')},
-                                file_path=pathlib.Path('0002.txt'))
+                                file_path=pathlib.Path(f'0002{msg_suffix}'))
         self.maxDiff = None
 
     def test_unique_id(self) -> None:
@@ -99,24 +113,24 @@ class TestChat(TestChatBase):
 
     def test_find_remove_messages(self) -> None:
         self.chat.msg_add([self.message1, self.message2])
-        msgs = self.chat.msg_find(['0001.txt'])
+        msgs = self.chat.msg_find(['0001'])
         self.assertListEqual(msgs, [self.message1])
-        msgs = self.chat.msg_find(['0001.txt', '0002.txt'])
+        msgs = self.chat.msg_find(['0001', '0002'])
         self.assertListEqual(msgs, [self.message1, self.message2])
         # add new Message with full path
         message3 = Message(Question('Question 2'),
                            Answer('Answer 2'),
                            {Tag('btag2')},
-                           file_path=pathlib.Path('/foo/bla/0003.txt'))
+                           file_path=pathlib.Path(f'/foo/bla/0003{msg_suffix}'))
         self.chat.msg_add([message3])
         # find new Message by full path
-        msgs = self.chat.msg_find(['/foo/bla/0003.txt'])
+        msgs = self.chat.msg_find([f'/foo/bla/0003{msg_suffix}'])
         self.assertListEqual(msgs, [message3])
         # find Message with full path only by filename
-        msgs = self.chat.msg_find(['0003.txt'])
+        msgs = self.chat.msg_find([f'0003{msg_suffix}'])
         self.assertListEqual(msgs, [message3])
         # remove last message
-        self.chat.msg_remove(['0003.txt'])
+        self.chat.msg_remove(['0003'])
         self.assertListEqual(self.chat.messages, [self.message1, self.message2])
 
     def test_latest_message(self) -> None:
@@ -146,13 +160,13 @@ Answer 2
         self.chat.msg_add([self.message1, self.message2])
         self.chat.print(paged=False, with_tags=True, with_files=True)
         expected_output = f"""{TagLine.prefix} atag1 btag2
-FILE: 0001.txt
+FILE: 0001{msg_suffix}
 {Question.txt_header}
 Question 1
 {Answer.txt_header}
 Answer 1
 {TagLine.prefix} btag2
-FILE: 0002.txt
+FILE: 0002{msg_suffix}
 {Question.txt_header}
 Question 2
 {Answer.txt_header}
@@ -168,31 +182,27 @@ class TestChatDB(TestChatBase):
 
         self.message1 = Message(Question('Question 1'),
                                 Answer('Answer 1'),
-                                {Tag('tag1')},
+                                {Tag('tag1')})
-                                file_path=pathlib.Path('0001.txt'))
         self.message2 = Message(Question('Question 2'),
                                 Answer('Answer 2'),
-                                {Tag('tag2')},
+                                {Tag('tag2')})
-                                file_path=pathlib.Path('0002.yaml'))
         self.message3 = Message(Question('Question 3'),
                                 Answer('Answer 3'),
-                                {Tag('tag3')},
+                                {Tag('tag3')})
-                                file_path=pathlib.Path('0003.txt'))
         self.message4 = Message(Question('Question 4'),
                                 Answer('Answer 4'),
-                                {Tag('tag4')},
+                                {Tag('tag4')})
-                                file_path=pathlib.Path('0004.yaml'))
 
-        self.message1.to_file(pathlib.Path(self.db_path.name, '0001.txt'))
+        self.message1.to_file(pathlib.Path(self.db_path.name, '0001'), mformat='txt')
-        self.message2.to_file(pathlib.Path(self.db_path.name, '0002.yaml'))
+        self.message2.to_file(pathlib.Path(self.db_path.name, '0002'), mformat='yaml')
-        self.message3.to_file(pathlib.Path(self.db_path.name, '0003.txt'))
+        self.message3.to_file(pathlib.Path(self.db_path.name, '0003'), mformat='txt')
-        self.message4.to_file(pathlib.Path(self.db_path.name, '0004.yaml'))
+        self.message4.to_file(pathlib.Path(self.db_path.name, '0004'), mformat='yaml')
         # make the next FID match the current state
         next_fname = pathlib.Path(self.db_path.name) / '.next'
         with open(next_fname, 'w') as f:
             f.write('4')
         # add some "trash" in order to test if it's correctly handled / ignored
-        self.trash_files = ['.config.yaml', 'foo.yaml', 'bla.txt']
+        self.trash_files = ['.config.yaml', 'foo.yaml', 'bla.txt', 'fubar.msg']
         for file in self.trash_files:
             with open(pathlib.Path(self.db_path.name) / file, 'w') as f:
                 f.write('test trash')
@@ -207,7 +217,7 @@ class TestChatDB(TestChatBase):
         List all Message files in the given TemporaryDirectory.
         """
         # exclude '.next'
-        return [f for f in pathlib.Path(tmp_dir.name).glob('*.[ty]*') if f.name not in self.trash_files]
+        return [f for f in pathlib.Path(tmp_dir.name).glob('*.[tym]*') if f.name not in self.trash_files]
 
     def tearDown(self) -> None:
         self.db_path.cleanup()
@@ -218,13 +228,31 @@ class TestChatDB(TestChatBase):
         duplicate_message = Message(Question('Question 4'),
                                     Answer('Answer 4'),
                                     {Tag('tag4')},
-                                    file_path=pathlib.Path('0004.txt'))
+                                    file_path=pathlib.Path(self.db_path.name, '0004.txt'))
-        duplicate_message.to_file(pathlib.Path(self.db_path.name, '0004.txt'))
+        msg_to_file_force_suffix(duplicate_message)
         with self.assertRaises(ChatError) as cm:
             ChatDB.from_dir(pathlib.Path(self.cache_path.name),
                             pathlib.Path(self.db_path.name))
         self.assertEqual(str(cm.exception), "Validation failed")
 
+    def test_file_path_ID_exists(self) -> None:
+        """
+        Tests if the CacheDB chooses another ID if a file path with
+        the given one exists.
+        """
+        # create a new and empty CacheDB
+        db_path = tempfile.TemporaryDirectory()
+        cache_path = tempfile.TemporaryDirectory()
+        chat_db = ChatDB.from_dir(pathlib.Path(cache_path.name),
+                                  pathlib.Path(db_path.name))
+        # add a message file
+        message = Message(Question('What?'),
+                          file_path=pathlib.Path(cache_path.name) / f'0001{msg_suffix}')
+        message.to_file()
+        message1 = Message(Question('Where?'))
+        chat_db.cache_write([message1])
+        self.assertEqual(message1.msg_id(), '0002')
+
     def test_from_dir(self) -> None:
         chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
                                   pathlib.Path(self.db_path.name))
@@ -233,25 +261,23 @@ class TestChatDB(TestChatBase):
         self.assertEqual(chat_db.db_path, pathlib.Path(self.db_path.name))
         # check that the files are sorted
         self.assertEqual(chat_db.messages[0].file_path,
-                         pathlib.Path(self.db_path.name, '0001.txt'))
+                         pathlib.Path(self.db_path.name, f'0001{msg_suffix}'))
         self.assertEqual(chat_db.messages[1].file_path,
-                         pathlib.Path(self.db_path.name, '0002.yaml'))
+                         pathlib.Path(self.db_path.name, f'0002{msg_suffix}'))
         self.assertEqual(chat_db.messages[2].file_path,
-                         pathlib.Path(self.db_path.name, '0003.txt'))
+                         pathlib.Path(self.db_path.name, f'0003{msg_suffix}'))
         self.assertEqual(chat_db.messages[3].file_path,
-                         pathlib.Path(self.db_path.name, '0004.yaml'))
+                         pathlib.Path(self.db_path.name, f'0004{msg_suffix}'))
 
     def test_from_dir_glob(self) -> None:
         chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
                                   pathlib.Path(self.db_path.name),
-                                  glob='*.txt')
+                                  glob='*1.*')
-        self.assertEqual(len(chat_db.messages), 2)
+        self.assertEqual(len(chat_db.messages), 1)
         self.assertEqual(chat_db.cache_path, pathlib.Path(self.cache_path.name))
         self.assertEqual(chat_db.db_path, pathlib.Path(self.db_path.name))
         self.assertEqual(chat_db.messages[0].file_path,
-                         pathlib.Path(self.db_path.name, '0001.txt'))
+                         pathlib.Path(self.db_path.name, f'0001{msg_suffix}'))
-        self.assertEqual(chat_db.messages[1].file_path,
-                         pathlib.Path(self.db_path.name, '0003.txt'))
 
     def test_from_dir_filter_tags(self) -> None:
         chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
@@ -261,7 +287,7 @@ class TestChatDB(TestChatBase):
         self.assertEqual(chat_db.cache_path, pathlib.Path(self.cache_path.name))
         self.assertEqual(chat_db.db_path, pathlib.Path(self.db_path.name))
         self.assertEqual(chat_db.messages[0].file_path,
-                         pathlib.Path(self.db_path.name, '0001.txt'))
+                         pathlib.Path(self.db_path.name, f'0001{msg_suffix}'))
 
     def test_from_dir_filter_tags_empty(self) -> None:
         chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
@@ -279,7 +305,7 @@ class TestChatDB(TestChatBase):
         self.assertEqual(chat_db.cache_path, pathlib.Path(self.cache_path.name))
         self.assertEqual(chat_db.db_path, pathlib.Path(self.db_path.name))
         self.assertEqual(chat_db.messages[0].file_path,
-                         pathlib.Path(self.db_path.name, '0002.yaml'))
+                         pathlib.Path(self.db_path.name, f'0002{msg_suffix}'))
         self.assertEqual(chat_db.messages[0].answer, 'Answer 2')
 
     def test_from_messages(self) -> None:
@@ -324,25 +350,25 @@ class TestChatDB(TestChatBase):
         chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
                                   pathlib.Path(self.db_path.name))
         # check that Message.file_path is correct
-        self.assertEqual(chat_db.messages[0].file_path, pathlib.Path(self.db_path.name, '0001.txt'))
+        self.assertEqual(chat_db.messages[0].file_path, pathlib.Path(self.db_path.name, f'0001{msg_suffix}'))
-        self.assertEqual(chat_db.messages[1].file_path, pathlib.Path(self.db_path.name, '0002.yaml'))
+        self.assertEqual(chat_db.messages[1].file_path, pathlib.Path(self.db_path.name, f'0002{msg_suffix}'))
-        self.assertEqual(chat_db.messages[2].file_path, pathlib.Path(self.db_path.name, '0003.txt'))
+        self.assertEqual(chat_db.messages[2].file_path, pathlib.Path(self.db_path.name, f'0003{msg_suffix}'))
-        self.assertEqual(chat_db.messages[3].file_path, pathlib.Path(self.db_path.name, '0004.yaml'))
+        self.assertEqual(chat_db.messages[3].file_path, pathlib.Path(self.db_path.name, f'0004{msg_suffix}'))
 
         # write the messages to the cache directory
         chat_db.cache_write()
         # check if the written files are in the cache directory
         cache_dir_files = self.message_list(self.cache_path)
         self.assertEqual(len(cache_dir_files), 4)
-        self.assertIn(pathlib.Path(self.cache_path.name, '0001.txt'), cache_dir_files)
+        self.assertIn(pathlib.Path(self.cache_path.name, f'0001{msg_suffix}'), cache_dir_files)
-        self.assertIn(pathlib.Path(self.cache_path.name, '0002.yaml'), cache_dir_files)
+        self.assertIn(pathlib.Path(self.cache_path.name, f'0002{msg_suffix}'), cache_dir_files)
-        self.assertIn(pathlib.Path(self.cache_path.name, '0003.txt'), cache_dir_files)
+        self.assertIn(pathlib.Path(self.cache_path.name, f'0003{msg_suffix}'), cache_dir_files)
-        self.assertIn(pathlib.Path(self.cache_path.name, '0004.yaml'), cache_dir_files)
+        self.assertIn(pathlib.Path(self.cache_path.name, f'0004{msg_suffix}'), cache_dir_files)
         # check that Message.file_path has been correctly updated
-        self.assertEqual(chat_db.messages[0].file_path, pathlib.Path(self.cache_path.name, '0001.txt'))
+        self.assertEqual(chat_db.messages[0].file_path, pathlib.Path(self.cache_path.name, f'0001{msg_suffix}'))
-        self.assertEqual(chat_db.messages[1].file_path, pathlib.Path(self.cache_path.name, '0002.yaml'))
+        self.assertEqual(chat_db.messages[1].file_path, pathlib.Path(self.cache_path.name, f'0002{msg_suffix}'))
-        self.assertEqual(chat_db.messages[2].file_path, pathlib.Path(self.cache_path.name, '0003.txt'))
+        self.assertEqual(chat_db.messages[2].file_path, pathlib.Path(self.cache_path.name, f'0003{msg_suffix}'))
-        self.assertEqual(chat_db.messages[3].file_path, pathlib.Path(self.cache_path.name, '0004.yaml'))
+        self.assertEqual(chat_db.messages[3].file_path, pathlib.Path(self.cache_path.name, f'0004{msg_suffix}'))
 
         # check the timestamp of the files in the DB directory
         db_dir_files = self.message_list(self.db_path)
@@ -354,18 +380,18 @@ class TestChatDB(TestChatBase):
         # check if the written files are in the DB directory
         db_dir_files = self.message_list(self.db_path)
         self.assertEqual(len(db_dir_files), 4)
-        self.assertIn(pathlib.Path(self.db_path.name, '0001.txt'), db_dir_files)
+        self.assertIn(pathlib.Path(self.db_path.name, f'0001{msg_suffix}'), db_dir_files)
-        self.assertIn(pathlib.Path(self.db_path.name, '0002.yaml'), db_dir_files)
+        self.assertIn(pathlib.Path(self.db_path.name, f'0002{msg_suffix}'), db_dir_files)
-        self.assertIn(pathlib.Path(self.db_path.name, '0003.txt'), db_dir_files)
+        self.assertIn(pathlib.Path(self.db_path.name, f'0003{msg_suffix}'), db_dir_files)
-        self.assertIn(pathlib.Path(self.db_path.name, '0004.yaml'), db_dir_files)
+        self.assertIn(pathlib.Path(self.db_path.name, f'0004{msg_suffix}'), db_dir_files)
         # check if all files in the DB dir have actually been overwritten
         for file in db_dir_files:
             self.assertGreater(file.stat().st_mtime, old_timestamps[file])
         # check that Message.file_path has been correctly updated (again)
-        self.assertEqual(chat_db.messages[0].file_path, pathlib.Path(self.db_path.name, '0001.txt'))
+        self.assertEqual(chat_db.messages[0].file_path, pathlib.Path(self.db_path.name, f'0001{msg_suffix}'))
-        self.assertEqual(chat_db.messages[1].file_path, pathlib.Path(self.db_path.name, '0002.yaml'))
+        self.assertEqual(chat_db.messages[1].file_path, pathlib.Path(self.db_path.name, f'0002{msg_suffix}'))
-        self.assertEqual(chat_db.messages[2].file_path, pathlib.Path(self.db_path.name, '0003.txt'))
+        self.assertEqual(chat_db.messages[2].file_path, pathlib.Path(self.db_path.name, f'0003{msg_suffix}'))
-        self.assertEqual(chat_db.messages[3].file_path, pathlib.Path(self.db_path.name, '0004.yaml'))
+        self.assertEqual(chat_db.messages[3].file_path, pathlib.Path(self.db_path.name, f'0004{msg_suffix}'))
 
     def test_db_read(self) -> None:
         # create a new ChatDB instance
@@ -380,65 +406,65 @@ class TestChatDB(TestChatBase):
         new_message2 = Message(Question('Question 6'),
                                Answer('Answer 6'),
                                {Tag('tag6')})
-        new_message1.to_file(pathlib.Path(self.db_path.name, '0005.txt'))
+        new_message1.to_file(pathlib.Path(self.db_path.name, f'0005{msg_suffix}'), mformat='txt')
-        new_message2.to_file(pathlib.Path(self.db_path.name, '0006.yaml'))
+        new_message2.to_file(pathlib.Path(self.db_path.name, f'0006{msg_suffix}'), mformat='yaml')
         # read and check them
         chat_db.db_read()
         self.assertEqual(len(chat_db.messages), 6)
-        self.assertEqual(chat_db.messages[4].file_path, pathlib.Path(self.db_path.name, '0005.txt'))
+        self.assertEqual(chat_db.messages[4].file_path, pathlib.Path(self.db_path.name, f'0005{msg_suffix}'))
-        self.assertEqual(chat_db.messages[5].file_path, pathlib.Path(self.db_path.name, '0006.yaml'))
+        self.assertEqual(chat_db.messages[5].file_path, pathlib.Path(self.db_path.name, f'0006{msg_suffix}'))
 
         # create 2 new files in the cache directory
         new_message3 = Message(Question('Question 7'),
-                               Answer('Answer 5'),
+                               Answer('Answer 7'),
                                {Tag('tag7')})
         new_message4 = Message(Question('Question 8'),
-                               Answer('Answer 6'),
+                               Answer('Answer 8'),
                                {Tag('tag8')})
-        new_message3.to_file(pathlib.Path(self.cache_path.name, '0007.txt'))
+        new_message3.to_file(pathlib.Path(self.cache_path.name, f'0007{msg_suffix}'), mformat='txt')
-        new_message4.to_file(pathlib.Path(self.cache_path.name, '0008.yaml'))
+        new_message4.to_file(pathlib.Path(self.cache_path.name, f'0008{msg_suffix}'), mformat='yaml')
         # read and check them
         chat_db.cache_read()
         self.assertEqual(len(chat_db.messages), 8)
         # check that the new message have the cache dir path
-        self.assertEqual(chat_db.messages[6].file_path, pathlib.Path(self.cache_path.name, '0007.txt'))
+        self.assertEqual(chat_db.messages[6].file_path, pathlib.Path(self.cache_path.name, f'0007{msg_suffix}'))
-        self.assertEqual(chat_db.messages[7].file_path, pathlib.Path(self.cache_path.name, '0008.yaml'))
+        self.assertEqual(chat_db.messages[7].file_path, pathlib.Path(self.cache_path.name, f'0008{msg_suffix}'))
         # an the old ones keep their path (since they have not been replaced)
-        self.assertEqual(chat_db.messages[4].file_path, pathlib.Path(self.db_path.name, '0005.txt'))
+        self.assertEqual(chat_db.messages[4].file_path, pathlib.Path(self.db_path.name, f'0005{msg_suffix}'))
-        self.assertEqual(chat_db.messages[5].file_path, pathlib.Path(self.db_path.name, '0006.yaml'))
+        self.assertEqual(chat_db.messages[5].file_path, pathlib.Path(self.db_path.name, f'0006{msg_suffix}'))
 
         # now overwrite two messages in the DB directory
         new_message1.question = Question('New Question 1')
         new_message2.question = Question('New Question 2')
-        new_message1.to_file(pathlib.Path(self.db_path.name, '0005.txt'))
+        new_message1.to_file(pathlib.Path(self.db_path.name, f'0005{msg_suffix}'), mformat='txt')
-        new_message2.to_file(pathlib.Path(self.db_path.name, '0006.yaml'))
+        new_message2.to_file(pathlib.Path(self.db_path.name, f'0006{msg_suffix}'), mformat='yaml')
         # read from the DB dir and check if the modified messages have been updated
         chat_db.db_read()
         self.assertEqual(len(chat_db.messages), 8)
         self.assertEqual(chat_db.messages[4].question, 'New Question 1')
         self.assertEqual(chat_db.messages[5].question, 'New Question 2')
-        self.assertEqual(chat_db.messages[4].file_path, pathlib.Path(self.db_path.name, '0005.txt'))
+        self.assertEqual(chat_db.messages[4].file_path, pathlib.Path(self.db_path.name, f'0005{msg_suffix}'))
-        self.assertEqual(chat_db.messages[5].file_path, pathlib.Path(self.db_path.name, '0006.yaml'))
+        self.assertEqual(chat_db.messages[5].file_path, pathlib.Path(self.db_path.name, f'0006{msg_suffix}'))
 
         # now write the messages from the cache to the DB directory
-        new_message3.to_file(pathlib.Path(self.db_path.name, '0007.txt'))
+        new_message3.to_file(pathlib.Path(self.db_path.name, f'0007{msg_suffix}'))
-        new_message4.to_file(pathlib.Path(self.db_path.name, '0008.yaml'))
+        new_message4.to_file(pathlib.Path(self.db_path.name, f'0008{msg_suffix}'))
         # read and check them
         chat_db.db_read()
         self.assertEqual(len(chat_db.messages), 8)
         # check that they now have the DB path
-        self.assertEqual(chat_db.messages[6].file_path, pathlib.Path(self.db_path.name, '0007.txt'))
+        self.assertEqual(chat_db.messages[6].file_path, pathlib.Path(self.db_path.name, f'0007{msg_suffix}'))
-        self.assertEqual(chat_db.messages[7].file_path, pathlib.Path(self.db_path.name, '0008.yaml'))
+        self.assertEqual(chat_db.messages[7].file_path, pathlib.Path(self.db_path.name, f'0008{msg_suffix}'))
 
     def test_cache_clear(self) -> None:
         # create a new ChatDB instance
         chat_db = ChatDB.from_dir(pathlib.Path(self.cache_path.name),
                                   pathlib.Path(self.db_path.name))
         # check that Message.file_path is correct
-        self.assertEqual(chat_db.messages[0].file_path, pathlib.Path(self.db_path.name, '0001.txt'))
+        self.assertEqual(chat_db.messages[0].file_path, pathlib.Path(self.db_path.name, f'0001{msg_suffix}'))
-        self.assertEqual(chat_db.messages[1].file_path, pathlib.Path(self.db_path.name, '0002.yaml'))
+        self.assertEqual(chat_db.messages[1].file_path, pathlib.Path(self.db_path.name, f'0002{msg_suffix}'))
-        self.assertEqual(chat_db.messages[2].file_path, pathlib.Path(self.db_path.name, '0003.txt'))
+        self.assertEqual(chat_db.messages[2].file_path, pathlib.Path(self.db_path.name, f'0003{msg_suffix}'))
-        self.assertEqual(chat_db.messages[3].file_path, pathlib.Path(self.db_path.name, '0004.yaml'))
+        self.assertEqual(chat_db.messages[3].file_path, pathlib.Path(self.db_path.name, f'0004{msg_suffix}'))
 
         # write the messages to the cache directory
         chat_db.cache_write()
@@ -450,10 +476,10 @@ class TestChatDB(TestChatBase):
         chat_db.db_write()
         db_dir_files = self.message_list(self.db_path)
         self.assertEqual(len(db_dir_files), 4)
-        self.assertIn(pathlib.Path(self.db_path.name, '0001.txt'), db_dir_files)
+        self.assertIn(pathlib.Path(self.db_path.name, f'0001{msg_suffix}'), db_dir_files)
-        self.assertIn(pathlib.Path(self.db_path.name, '0002.yaml'), db_dir_files)
+        self.assertIn(pathlib.Path(self.db_path.name, f'0002{msg_suffix}'), db_dir_files)
-        self.assertIn(pathlib.Path(self.db_path.name, '0003.txt'), db_dir_files)
+        self.assertIn(pathlib.Path(self.db_path.name, f'0003{msg_suffix}'), db_dir_files)
-        self.assertIn(pathlib.Path(self.db_path.name, '0004.yaml'), db_dir_files)
+        self.assertIn(pathlib.Path(self.db_path.name, f'0004{msg_suffix}'), db_dir_files)
 
         # add a new message with empty file_path
         message_empty = Message(question=Question("What the hell am I doing here?"),
@@ -461,7 +487,7 @@ class TestChatDB(TestChatBase):
         # and one for the cache dir
         message_cache = Message(question=Question("What the hell am I doing here?"),
                                 answer=Answer("You're a creep!"),
-                                file_path=pathlib.Path(self.cache_path.name, '0005.txt'))
+                                file_path=pathlib.Path(self.cache_path.name, '0005'))
         chat_db.msg_add([message_empty, message_cache])
 
         # clear the cache and check the cache dir
@@ -523,11 +549,11 @@ class TestChatDB(TestChatBase):
             chat_db.msg_write([message])
 
         # write a message with a valid file_path
-        message.file_path = pathlib.Path(self.cache_path.name) / '123456.txt'
+        message.file_path = pathlib.Path(self.cache_path.name) / '123456'
         chat_db.msg_write([message])
         cache_dir_files = self.message_list(self.cache_path)
         self.assertEqual(len(cache_dir_files), 1)
-        self.assertIn(pathlib.Path(self.cache_path.name, '123456.txt'), cache_dir_files)
+        self.assertIn(pathlib.Path(self.cache_path.name, f'123456{msg_suffix}'), cache_dir_files)
 
     def test_msg_update(self) -> None:
         # create a new ChatDB instance
@@ -563,21 +589,21 @@ class TestChatDB(TestChatBase):
         # search for a DB file in memory
         self.assertEqual(chat_db.msg_find([str(self.message1.file_path)], loc='mem'), [self.message1])
         self.assertEqual(chat_db.msg_find([self.message1.msg_id()], loc='mem'), [self.message1])
-        self.assertEqual(chat_db.msg_find(['0001.txt'], loc='mem'), [self.message1])
+        self.assertEqual(chat_db.msg_find(['0001.msg'], loc='mem'), [self.message1])
         self.assertEqual(chat_db.msg_find(['0001'], loc='mem'), [self.message1])
         # and on disk
         self.assertEqual(chat_db.msg_find([str(self.message2.file_path)], loc='db'), [self.message2])
         self.assertEqual(chat_db.msg_find([self.message2.msg_id()], loc='db'), [self.message2])
-        self.assertEqual(chat_db.msg_find(['0002.yaml'], loc='db'), [self.message2])
+        self.assertEqual(chat_db.msg_find(['0002.msg'], loc='db'), [self.message2])
         self.assertEqual(chat_db.msg_find(['0002'], loc='db'), [self.message2])
         # now search the cache -> expect empty result
         self.assertEqual(chat_db.msg_find([str(self.message3.file_path)], loc='cache'), [])
         self.assertEqual(chat_db.msg_find([self.message3.msg_id()], loc='cache'), [])
-        self.assertEqual(chat_db.msg_find(['0003.txt'], loc='cache'), [])
+        self.assertEqual(chat_db.msg_find(['0003.msg'], loc='cache'), [])
         self.assertEqual(chat_db.msg_find(['0003'], loc='cache'), [])
         # search for multiple messages
         # -> search one twice, expect result to be unique
-        search_names = ['0001', '0002.yaml', self.message3.msg_id(), str(self.message3.file_path)]
+        search_names = ['0001', '0002.msg', self.message3.msg_id(), str(self.message3.file_path)]
         expected_result = [self.message1, self.message2, self.message3]
         result = chat_db.msg_find(search_names, loc='all')
         self.assert_messages_equal(result, expected_result)

tests/test_message.py

@@ -1,11 +1,16 @@
 import unittest
 import pathlib
 import tempfile
+import itertools
 from typing import cast
-from chatmastermind.message import source_code, Message, MessageError, Question, Answer, AILine, ModelLine, MessageFilter, message_in
+from chatmastermind.message import source_code, Message, MessageError, Question, Answer, AILine, ModelLine,\
+    MessageFilter, message_in, message_valid_formats
 from chatmastermind.tags import Tag, TagLine
 
 
+msg_suffix: str = Message.file_suffix_write
+
+
 class SourceCodeTestCase(unittest.TestCase):
     def test_source_code_with_include_delims(self) -> None:
         text = """
@@ -101,7 +106,7 @@ class AnswerTestCase(unittest.TestCase):
 
 class MessageToFileTxtTestCase(unittest.TestCase):
     def setUp(self) -> None:
-        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path = pathlib.Path(self.file.name)
         self.message_complete = Message(Question('This is a question.'),
                                         Answer('This is an answer.'),
@@ -117,7 +122,7 @@ class MessageToFileTxtTestCase(unittest.TestCase):
         self.file_path.unlink()
 
     def test_to_file_txt_complete(self) -> None:
-        self.message_complete.to_file(self.file_path)
+        self.message_complete.to_file(self.file_path, mformat='txt')
 
         with open(self.file_path, "r") as fd:
             content = fd.read()
@@ -132,7 +137,7 @@ This is an answer.
         self.assertEqual(content, expected_content)
 
     def test_to_file_txt_min(self) -> None:
-        self.message_min.to_file(self.file_path)
+        self.message_min.to_file(self.file_path, mformat='txt')
 
         with open(self.file_path, "r") as fd:
             content = fd.read()
@@ -141,11 +146,17 @@ This is a question.
 """
         self.assertEqual(content, expected_content)
 
-    def test_to_file_unsupported_file_type(self) -> None:
+    def test_to_file_unsupported_file_suffix(self) -> None:
         unsupported_file_path = pathlib.Path("example.doc")
         with self.assertRaises(MessageError) as cm:
             self.message_complete.to_file(unsupported_file_path)
-        self.assertEqual(str(cm.exception), "File type '.doc' is not supported")
+        self.assertEqual(str(cm.exception), "File suffix '.doc' is not supported")
+
+    def test_to_file_unsupported_file_format(self) -> None:
+        unsupported_file_format = pathlib.Path(f"example{msg_suffix}")
+        with self.assertRaises(MessageError) as cm:
+            self.message_complete.to_file(unsupported_file_format, mformat='doc')  # type: ignore [arg-type]
+        self.assertEqual(str(cm.exception), "File format 'doc' is not supported")
 
     def test_to_file_no_file_path(self) -> None:
         """
@@ -159,10 +170,24 @@ This is a question.
         # reset the internal file_path
         self.message_complete.file_path = self.file_path
 
+    def test_to_file_txt_auto_suffix(self) -> None:
+        """
+        Test if suffix is auto-generated if omitted.
+        """
+        file_path_no_suffix = self.file_path.with_suffix('')
+        # test with file_path member
+        self.message_min.file_path = file_path_no_suffix
+        self.message_min.to_file(mformat='txt')
+        self.assertEqual(self.message_min.file_path.suffix, msg_suffix)
+        # test with explicit file_path
+        self.message_min.file_path = file_path_no_suffix
+        self.message_min.to_file(file_path=file_path_no_suffix, mformat='txt')
+        self.assertEqual(self.message_min.file_path.suffix, msg_suffix)
+
 
 class MessageToFileYamlTestCase(unittest.TestCase):
     def setUp(self) -> None:
-        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path = pathlib.Path(self.file.name)
         self.message_complete = Message(Question('This is a question.'),
                                         Answer('This is an answer.'),
@@ -184,7 +209,7 @@ class MessageToFileYamlTestCase(unittest.TestCase):
         self.file_path.unlink()
 
     def test_to_file_yaml_complete(self) -> None:
-        self.message_complete.to_file(self.file_path)
+        self.message_complete.to_file(self.file_path, mformat='yaml')
 
         with open(self.file_path, "r") as fd:
             content = fd.read()
@@ -199,7 +224,7 @@ class MessageToFileYamlTestCase(unittest.TestCase):
         self.assertEqual(content, expected_content)
 
     def test_to_file_yaml_multiline(self) -> None:
-        self.message_multiline.to_file(self.file_path)
+        self.message_multiline.to_file(self.file_path, mformat='yaml')
 
         with open(self.file_path, "r") as fd:
             content = fd.read()
@@ -218,17 +243,31 @@ class MessageToFileYamlTestCase(unittest.TestCase):
         self.assertEqual(content, expected_content)
 
     def test_to_file_yaml_min(self) -> None:
-        self.message_min.to_file(self.file_path)
+        self.message_min.to_file(self.file_path, mformat='yaml')
 
         with open(self.file_path, "r") as fd:
             content = fd.read()
         expected_content = f"{Question.yaml_key}: This is a question.\n"
         self.assertEqual(content, expected_content)
 
+    def test_to_file_yaml_auto_suffix(self) -> None:
+        """
+        Test if suffix is auto-generated if omitted.
+        """
+        file_path_no_suffix = self.file_path.with_suffix('')
+        # test with file_path member
+        self.message_min.file_path = file_path_no_suffix
+        self.message_min.to_file(mformat='yaml')
+        self.assertEqual(self.message_min.file_path.suffix, msg_suffix)
+        # test with explicit file_path
+        self.message_min.file_path = file_path_no_suffix
+        self.message_min.to_file(file_path=file_path_no_suffix, mformat='yaml')
+        self.assertEqual(self.message_min.file_path.suffix, msg_suffix)
+
 
 class MessageFromFileTxtTestCase(unittest.TestCase):
     def setUp(self) -> None:
-        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path = pathlib.Path(self.file.name)
         with open(self.file_path, "w") as fd:
             fd.write(f"""{TagLine.prefix} tag1 tag2
@@ -239,7 +278,7 @@ This is a question.
 {Answer.txt_header}
 This is an answer.
 """)
-        self.file_min = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file_min = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path_min = pathlib.Path(self.file_min.name)
         with open(self.file_path_min, "w") as fd:
             fd.write(f"""{Question.txt_header}
@@ -259,13 +298,13 @@ This is a question.
         message = Message.from_file(self.file_path)
         self.assertIsNotNone(message)
         self.assertIsInstance(message, Message)
-        if message:  # mypy bug
+        assert message
-            self.assertEqual(message.question, 'This is a question.')
+        self.assertEqual(message.question, 'This is a question.')
-            self.assertEqual(message.answer, 'This is an answer.')
+        self.assertEqual(message.answer, 'This is an answer.')
-            self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
+        self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
-            self.assertEqual(message.ai, 'ChatGPT')
+        self.assertEqual(message.ai, 'ChatGPT')
-            self.assertEqual(message.model, 'gpt-3.5-turbo')
+        self.assertEqual(message.model, 'gpt-3.5-turbo')
-            self.assertEqual(message.file_path, self.file_path)
+        self.assertEqual(message.file_path, self.file_path)
 
     def test_from_file_txt_min(self) -> None:
         """
@@ -274,21 +313,21 @@ This is a question.
         message = Message.from_file(self.file_path_min)
         self.assertIsNotNone(message)
         self.assertIsInstance(message, Message)
-        if message:  # mypy bug
+        assert message
-            self.assertEqual(message.question, 'This is a question.')
+        self.assertEqual(message.question, 'This is a question.')
-            self.assertEqual(message.file_path, self.file_path_min)
+        self.assertEqual(message.file_path, self.file_path_min)
-            self.assertIsNone(message.answer)
+        self.assertIsNone(message.answer)
 
     def test_from_file_txt_tags_match(self) -> None:
         message = Message.from_file(self.file_path,
                                     MessageFilter(tags_or={Tag('tag1')}))
         self.assertIsNotNone(message)
         self.assertIsInstance(message, Message)
-        if message:  # mypy bug
+        assert message
-            self.assertEqual(message.question, 'This is a question.')
+        self.assertEqual(message.question, 'This is a question.')
-            self.assertEqual(message.answer, 'This is an answer.')
+        self.assertEqual(message.answer, 'This is an answer.')
-            self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
+        self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
-            self.assertEqual(message.file_path, self.file_path)
+        self.assertEqual(message.file_path, self.file_path)
 
     def test_from_file_txt_tags_dont_match(self) -> None:
         message = Message.from_file(self.file_path,
@@ -311,13 +350,13 @@ This is a question.
                                     MessageFilter(tags_not={Tag('tag1')}))
         self.assertIsNotNone(message)
         self.assertIsInstance(message, Message)
-        if message:  # mypy bug
+        assert message
-            self.assertEqual(message.question, 'This is a question.')
+        self.assertEqual(message.question, 'This is a question.')
-            self.assertSetEqual(cast(set[Tag], message.tags), set())
+        self.assertSetEqual(cast(set[Tag], message.tags), set())
-            self.assertEqual(message.file_path, self.file_path_min)
+        self.assertEqual(message.file_path, self.file_path_min)
 
     def test_from_file_not_exists(self) -> None:
-        file_not_exists = pathlib.Path("example.txt")
+        file_not_exists = pathlib.Path(f"example{msg_suffix}")
         with self.assertRaises(MessageError) as cm:
             Message.from_file(file_not_exists)
         self.assertEqual(str(cm.exception), f"Message file '{file_not_exists}' does not exist")
@@ -396,7 +435,7 @@ This is a question.
 
 class MessageFromFileYamlTestCase(unittest.TestCase):
     def setUp(self) -> None:
-        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path = pathlib.Path(self.file.name)
         with open(self.file_path, "w") as fd:
             fd.write(f"""
@@ -410,7 +449,7 @@ class MessageFromFileYamlTestCase(unittest.TestCase):
   - tag1
   - tag2
 """)
-        self.file_min = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file_min = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path_min = pathlib.Path(self.file_min.name)
         with open(self.file_path_min, "w") as fd:
             fd.write(f"""
@@ -431,13 +470,13 @@ class MessageFromFileYamlTestCase(unittest.TestCase):
         message = Message.from_file(self.file_path)
         self.assertIsInstance(message, Message)
         self.assertIsNotNone(message)
-        if message:  # mypy bug
+        assert message
-            self.assertEqual(message.question, 'This is a question.')
+        self.assertEqual(message.question, 'This is a question.')
-            self.assertEqual(message.answer, 'This is an answer.')
+        self.assertEqual(message.answer, 'This is an answer.')
-            self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
+        self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
-            self.assertEqual(message.ai, 'ChatGPT')
+        self.assertEqual(message.ai, 'ChatGPT')
-            self.assertEqual(message.model, 'gpt-3.5-turbo')
+        self.assertEqual(message.model, 'gpt-3.5-turbo')
-            self.assertEqual(message.file_path, self.file_path)
+        self.assertEqual(message.file_path, self.file_path)
 
     def test_from_file_yaml_min(self) -> None:
         """
@@ -446,14 +485,14 @@ class MessageFromFileYamlTestCase(unittest.TestCase):
         message = Message.from_file(self.file_path_min)
         self.assertIsInstance(message, Message)
         self.assertIsNotNone(message)
-        if message:  # mypy bug
+        assert message
-            self.assertEqual(message.question, 'This is a question.')
+        self.assertEqual(message.question, 'This is a question.')
-            self.assertSetEqual(cast(set[Tag], message.tags), set())
+        self.assertSetEqual(cast(set[Tag], message.tags), set())
-            self.assertEqual(message.file_path, self.file_path_min)
+        self.assertEqual(message.file_path, self.file_path_min)
-            self.assertIsNone(message.answer)
+        self.assertIsNone(message.answer)
 
     def test_from_file_not_exists(self) -> None:
-        file_not_exists = pathlib.Path("example.yaml")
+        file_not_exists = pathlib.Path(f"example{msg_suffix}")
         with self.assertRaises(MessageError) as cm:
             Message.from_file(file_not_exists)
         self.assertEqual(str(cm.exception), f"Message file '{file_not_exists}' does not exist")
@@ -463,11 +502,11 @@ class MessageFromFileYamlTestCase(unittest.TestCase):
                                     MessageFilter(tags_or={Tag('tag1')}))
         self.assertIsNotNone(message)
         self.assertIsInstance(message, Message)
-        if message:  # mypy bug
+        assert message
-            self.assertEqual(message.question, 'This is a question.')
+        self.assertEqual(message.question, 'This is a question.')
-            self.assertEqual(message.answer, 'This is an answer.')
+        self.assertEqual(message.answer, 'This is an answer.')
-            self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
+        self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
-            self.assertEqual(message.file_path, self.file_path)
+        self.assertEqual(message.file_path, self.file_path)
 
     def test_from_file_yaml_tags_dont_match(self) -> None:
         message = Message.from_file(self.file_path,
@@ -484,10 +523,10 @@ class MessageFromFileYamlTestCase(unittest.TestCase):
                                     MessageFilter(tags_not={Tag('tag1')}))
         self.assertIsNotNone(message)
         self.assertIsInstance(message, Message)
-        if message:  # mypy bug
+        assert message
-            self.assertEqual(message.question, 'This is a question.')
+        self.assertEqual(message.question, 'This is a question.')
-            self.assertSetEqual(cast(set[Tag], message.tags), set())
+        self.assertSetEqual(cast(set[Tag], message.tags), set())
-            self.assertEqual(message.file_path, self.file_path_min)
+        self.assertEqual(message.file_path, self.file_path_min)
 
     def test_from_file_yaml_question_match(self) -> None:
         message = Message.from_file(self.file_path,
@@ -563,7 +602,7 @@ class MessageFromFileYamlTestCase(unittest.TestCase):
 
 class TagsFromFileTestCase(unittest.TestCase):
     def setUp(self) -> None:
-        self.file_txt = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file_txt = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path_txt = pathlib.Path(self.file_txt.name)
         with open(self.file_path_txt, "w") as fd:
             fd.write(f"""{TagLine.prefix} tag1 tag2 ptag3
@@ -572,7 +611,7 @@ This is a question.
 {Answer.txt_header}
 This is an answer.
 """)
-        self.file_txt_no_tags = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file_txt_no_tags = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path_txt_no_tags = pathlib.Path(self.file_txt_no_tags.name)
         with open(self.file_path_txt_no_tags, "w") as fd:
             fd.write(f"""{Question.txt_header}
@@ -580,7 +619,7 @@ This is a question.
 {Answer.txt_header}
 This is an answer.
 """)
-        self.file_txt_tags_empty = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file_txt_tags_empty = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path_txt_tags_empty = pathlib.Path(self.file_txt_tags_empty.name)
         with open(self.file_path_txt_tags_empty, "w") as fd:
             fd.write(f"""TAGS:
@@ -589,7 +628,7 @@ This is a question.
 {Answer.txt_header}
 This is an answer.
 """)
-        self.file_yaml = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file_yaml = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path_yaml = pathlib.Path(self.file_yaml.name)
         with open(self.file_path_yaml, "w") as fd:
             fd.write(f"""
@@ -602,7 +641,7 @@ This is an answer.
   - tag2
   - ptag3
 """)
-        self.file_yaml_no_tags = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file_yaml_no_tags = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path_yaml_no_tags = pathlib.Path(self.file_yaml_no_tags.name)
         with open(self.file_path_yaml_no_tags, "w") as fd:
             fd.write(f"""
@@ -679,24 +718,25 @@ class TagsFromDirTestCase(unittest.TestCase):
             {Tag('ctag5'), Tag('ctag6')}
         ]
         self.files = [
-            pathlib.Path(self.temp_dir.name, 'file1.txt'),
+            pathlib.Path(self.temp_dir.name, f'file1{msg_suffix}'),
-            pathlib.Path(self.temp_dir.name, 'file2.yaml'),
+            pathlib.Path(self.temp_dir.name, f'file2{msg_suffix}'),
-            pathlib.Path(self.temp_dir.name, 'file3.txt')
+            pathlib.Path(self.temp_dir.name, f'file3{msg_suffix}')
         ]
         self.files_no_tags = [
-            pathlib.Path(self.temp_dir_no_tags.name, 'file4.txt'),
+            pathlib.Path(self.temp_dir_no_tags.name, f'file4{msg_suffix}'),
-            pathlib.Path(self.temp_dir_no_tags.name, 'file5.yaml'),
+            pathlib.Path(self.temp_dir_no_tags.name, f'file5{msg_suffix}'),
-            pathlib.Path(self.temp_dir_no_tags.name, 'file6.txt')
+            pathlib.Path(self.temp_dir_no_tags.name, f'file6{msg_suffix}')
         ]
+        mformats = itertools.cycle(message_valid_formats)
         for file, tags in zip(self.files, self.tag_sets):
             message = Message(Question('This is a question.'),
                               Answer('This is an answer.'),
                               tags)
-            message.to_file(file)
+            message.to_file(file, next(mformats))
         for file in self.files_no_tags:
             message = Message(Question('This is a question.'),
                               Answer('This is an answer.'))
-            message.to_file(file)
+            message.to_file(file, next(mformats))
 
     def tearDown(self) -> None:
         self.temp_dir.cleanup()
@@ -719,7 +759,7 @@ class TagsFromDirTestCase(unittest.TestCase):
 
 class MessageIDTestCase(unittest.TestCase):
     def setUp(self) -> None:
-        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
         self.file_path = pathlib.Path(self.file.name)
         self.message = Message(Question('This is a question.'),
                                file_path=self.file_path)
@@ -834,3 +874,22 @@ 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)
+
+
+class MessageRmFileTestCase(unittest.TestCase):
+    def setUp(self) -> None:
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix=msg_suffix)
+        self.file_path = pathlib.Path(self.file.name)
+        self.message = Message(Question('This is a question.'),
+                               file_path=self.file_path)
+        self.message.to_file()
+
+    def tearDown(self) -> None:
+        self.file.close()
+        self.file_path.unlink(missing_ok=True)
+
+    def test_rm_file(self) -> None:
+        assert self.message.file_path
+        self.assertTrue(self.message.file_path.exists())
+        self.message.rm_file()
+        self.assertFalse(self.message.file_path.exists())

tests/test_question_cmd.py

@@ -14,6 +14,9 @@ from chatmastermind.ai import AIError
 from .test_common import TestWithFakeAI
 
 
+msg_suffix = Message.file_suffix_write
+
+
 class TestMessageCreate(TestWithFakeAI):
     """
     Test if messages created by the 'question' command have
@@ -38,6 +41,8 @@ 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.
@@ -83,7 +88,7 @@ Aaaand again some text."""
 
     def message_list(self, tmp_dir: tempfile.TemporaryDirectory) -> list[Path]:
         # exclude '.next'
-        return list(Path(tmp_dir.name).glob('*.[ty]*'))
+        return list(Path(tmp_dir.name).glob(f'*{msg_suffix}'))
 
     def test_message_file_created(self) -> None:
         self.args.ask = ["What is this?"]
@@ -201,6 +206,21 @@ 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:
@@ -231,7 +251,7 @@ class TestQuestionCmd(TestWithFakeAI):
 
     def message_list(self, tmp_dir: tempfile.TemporaryDirectory) -> list[Path]:
         # exclude '.next'
-        return sorted([f for f in Path(tmp_dir.name).glob('*.[ty]*')])
+        return sorted([f for f in Path(tmp_dir.name).glob(f'*{msg_suffix}')])
 
 
 class TestQuestionCmdAsk(TestQuestionCmd):
@@ -330,14 +350,16 @@ class TestQuestionCmdRepeat(TestQuestionCmd):
         Repeat a single question.
         """
         mock_create_ai.side_effect = self.mock_create_ai
+        chat = ChatDB.from_dir(Path(self.cache_dir.name),
+                               Path(self.db_dir.name))
         # create a message
         message = Message(Question(self.args.ask[0]),
                           Answer('Old Answer'),
                           tags=set(self.args.output_tags),
                           ai=self.args.AI,
                           model=self.args.model,
-                          file_path=Path(self.cache_dir.name) / '0001.txt')
+                          file_path=Path(self.cache_dir.name) / f'0001{msg_suffix}')
-        message.to_file()
+        chat.msg_write([message])
 
         # repeat the last question (without overwriting)
         # -> expect two identical messages (except for the file_path)
@@ -353,8 +375,6 @@ class TestQuestionCmdRepeat(TestQuestionCmd):
         # we expect the original message + the one with the new response
         expected_responses = [message] + [expected_response]
         question_cmd(self.args, self.config)
-        chat = ChatDB.from_dir(Path(self.cache_dir.name),
-                               Path(self.db_dir.name))
         cached_msg = chat.msg_gather(loc='cache')
         print(self.message_list(self.cache_dir))
         self.assertEqual(len(self.message_list(self.cache_dir)), 2)
@@ -366,16 +386,16 @@ class TestQuestionCmdRepeat(TestQuestionCmd):
         Repeat a single question and overwrite the old one.
         """
         mock_create_ai.side_effect = self.mock_create_ai
+        chat = ChatDB.from_dir(Path(self.cache_dir.name),
+                               Path(self.db_dir.name))
         # create a message
         message = Message(Question(self.args.ask[0]),
                           Answer('Old Answer'),
                           tags=set(self.args.output_tags),
                           ai=self.args.AI,
                           model=self.args.model,
-                          file_path=Path(self.cache_dir.name) / '0001.txt')
+                          file_path=Path(self.cache_dir.name) / f'0001{msg_suffix}')
-        message.to_file()
+        chat.msg_write([message])
-        chat = ChatDB.from_dir(Path(self.cache_dir.name),
-                               Path(self.db_dir.name))
         cached_msg = chat.msg_gather(loc='cache')
         assert cached_msg[0].file_path
         cached_msg_file_id = cached_msg[0].file_path.stem
@@ -405,16 +425,16 @@ class TestQuestionCmdRepeat(TestQuestionCmd):
         Repeat a single question after an error.
         """
         mock_create_ai.side_effect = self.mock_create_ai
+        chat = ChatDB.from_dir(Path(self.cache_dir.name),
+                               Path(self.db_dir.name))
         # create a question WITHOUT an answer
         # -> just like after an error, which is tested above
         message = Message(Question(self.args.ask[0]),
                           tags=set(self.args.output_tags),
                           ai=self.args.AI,
                           model=self.args.model,
-                          file_path=Path(self.cache_dir.name) / '0001.txt')
+                          file_path=Path(self.cache_dir.name) / f'0001{msg_suffix}')
-        message.to_file()
+        chat.msg_write([message])
-        chat = ChatDB.from_dir(Path(self.cache_dir.name),
-                               Path(self.db_dir.name))
         cached_msg = chat.msg_gather(loc='cache')
         assert cached_msg[0].file_path
         cached_msg_file_id = cached_msg[0].file_path.stem
@@ -445,16 +465,16 @@ class TestQuestionCmdRepeat(TestQuestionCmd):
         Repeat a single question with new arguments.
         """
         mock_create_ai.side_effect = self.mock_create_ai
+        chat = ChatDB.from_dir(Path(self.cache_dir.name),
+                               Path(self.db_dir.name))
         # create a message
         message = Message(Question(self.args.ask[0]),
                           Answer('Old Answer'),
                           tags=set(self.args.output_tags),
                           ai=self.args.AI,
                           model=self.args.model,
-                          file_path=Path(self.cache_dir.name) / '0001.txt')
+                          file_path=Path(self.cache_dir.name) / f'0001{msg_suffix}')
-        message.to_file()
+        chat.msg_write([message])
-        chat = ChatDB.from_dir(Path(self.cache_dir.name),
-                               Path(self.db_dir.name))
         cached_msg = chat.msg_gather(loc='cache')
         assert cached_msg[0].file_path
 
@@ -483,16 +503,16 @@ class TestQuestionCmdRepeat(TestQuestionCmd):
         Repeat a single question with new arguments, overwriting the old one.
         """
         mock_create_ai.side_effect = self.mock_create_ai
+        chat = ChatDB.from_dir(Path(self.cache_dir.name),
+                               Path(self.db_dir.name))
         # create a message
         message = Message(Question(self.args.ask[0]),
                           Answer('Old Answer'),
                           tags=set(self.args.output_tags),
                           ai=self.args.AI,
                           model=self.args.model,
-                          file_path=Path(self.cache_dir.name) / '0001.txt')
+                          file_path=Path(self.cache_dir.name) / f'0001{msg_suffix}')
-        message.to_file()
+        chat.msg_write([message])
-        chat = ChatDB.from_dir(Path(self.cache_dir.name),
-                               Path(self.db_dir.name))
         cached_msg = chat.msg_gather(loc='cache')
         assert cached_msg[0].file_path
 
@@ -520,29 +540,29 @@ class TestQuestionCmdRepeat(TestQuestionCmd):
         Repeat multiple  questions.
         """
         mock_create_ai.side_effect = self.mock_create_ai
+        chat = ChatDB.from_dir(Path(self.cache_dir.name),
+                               Path(self.db_dir.name))
         # 1. === create three questions ===
         # cached message without an answer
         message1 = Message(Question(self.args.ask[0]),
                            tags=self.args.output_tags,
                            ai=self.args.AI,
                            model=self.args.model,
-                           file_path=Path(self.cache_dir.name) / '0001.txt')
+                           file_path=Path(self.cache_dir.name) / f'0001{msg_suffix}')
         # cached message with an answer
         message2 = Message(Question(self.args.ask[0]),
                            Answer('Old Answer'),
                            tags=self.args.output_tags,
                            ai=self.args.AI,
                            model=self.args.model,
-                           file_path=Path(self.cache_dir.name) / '0002.txt')
+                           file_path=Path(self.cache_dir.name) / f'0002{msg_suffix}')
         # DB message without an answer
         message3 = Message(Question(self.args.ask[0]),
                            tags=self.args.output_tags,
                            ai=self.args.AI,
                            model=self.args.model,
-                           file_path=Path(self.db_dir.name) / '0003.txt')
+                           file_path=Path(self.db_dir.name) / f'0003{msg_suffix}')
-        message1.to_file()
+        chat.msg_write([message1, message2, message3])
-        message2.to_file()
-        message3.to_file()
         questions = [message1, message2, message3]
         expected_responses: list[Message] = []
         fake_ai = self.mock_create_ai(self.args, self.config)
@@ -566,8 +586,6 @@ class TestQuestionCmdRepeat(TestQuestionCmd):
         self.assertEqual(len(self.message_list(self.cache_dir)), 4)
         self.assertEqual(len(self.message_list(self.db_dir)), 1)
         expected_cache_messages = [expected_responses[0], message2, expected_responses[1], expected_responses[2]]
-        chat = ChatDB.from_dir(Path(self.cache_dir.name),
-                               Path(self.db_dir.name))
         cached_msg = chat.msg_gather(loc='cache')
         self.assert_msgs_equal_except_file_path(cached_msg, expected_cache_messages)
         # check that the DB message has not been modified at all