tests: added testcases for Message.from_file() and Message.to_file()

.gitignore

@@ -131,3 +131,4 @@ dmypy.json
 .config.yaml
 db
 noweb
+Session.vim

chatmastermind/configuration.py

@@ -63,4 +63,7 @@ class Config():
 
     def to_file(self, path: str) -> None:
         with open(path, 'w') as f:
-            yaml.dump(asdict(self), f)
+            yaml.dump(asdict(self), f, sort_keys=False)
+
+    def as_dict(self) -> dict[str, Any]:
+        return asdict(self)

chatmastermind/message.py

@@ -0,0 +1,346 @@
+"""
+Module implementing message related functions and classes.
+"""
+import pathlib
+import yaml
+from typing import Type, TypeVar, ClassVar, Optional, Any, Union, Final
+from dataclasses import dataclass, asdict
+from .tags import Tag, TagLine, TagError, match_tags
+
+QuestionInst = TypeVar('QuestionInst', bound='Question')
+AnswerInst = TypeVar('AnswerInst', bound='Answer')
+MessageInst = TypeVar('MessageInst', bound='Message')
+AILineInst = TypeVar('AILineInst', bound='AILine')
+ModelLineInst = TypeVar('ModelLineInst', bound='ModelLine')
+YamlDict = dict[str, Union[QuestionInst, AnswerInst, set[Tag]]]
+
+
+class MessageError(Exception):
+    pass
+
+
+def str_presenter(dumper: yaml.Dumper, data: str) -> yaml.ScalarNode:
+    """
+    Changes the YAML dump style to multiline syntax for multiline strings.
+    """
+    if len(data.splitlines()) > 1:
+        return dumper.represent_scalar('tag:yaml.org,2002:str', data, style='|')
+    return dumper.represent_scalar('tag:yaml.org,2002:str', data)
+
+
+yaml.add_representer(str, str_presenter)
+
+
+def source_code(text: str, include_delims: bool = False) -> list[str]:
+    """
+    Extract all source code sections from the given text, i. e. all lines
+    surrounded by lines tarting with '```'. If 'include_delims' is True,
+    the surrounding lines are included, otherwise they are omitted. The
+    result list contains every source code section as a single string.
+    The order in the list represents the order of the sections in the text.
+    """
+    code_sections: list[str] = []
+    code_lines: list[str] = []
+    in_code_block = False
+
+    for line in text.split('\n'):
+        if line.strip().startswith('```'):
+            if include_delims:
+                code_lines.append(line)
+            if in_code_block:
+                code_sections.append('\n'.join(code_lines) + '\n')
+                code_lines.clear()
+            in_code_block = not in_code_block
+        elif in_code_block:
+            code_lines.append(line)
+
+    return code_sections
+
+
+class AILine(str):
+    """
+    A line that represents the AI name in a '.txt' file..
+    """
+    prefix: Final[str] = 'AI:'
+
+    def __new__(cls: Type[AILineInst], string: str) -> AILineInst:
+        if not string.startswith(cls.prefix):
+            raise TagError(f"AILine '{string}' is missing prefix '{cls.prefix}'")
+        instance = super().__new__(cls, string)
+        return instance
+
+    def ai(self) -> str:
+        return self[len(self.prefix):].strip()
+
+    @classmethod
+    def from_ai(cls: Type[AILineInst], ai: str) -> AILineInst:
+        return cls(' '.join([cls.prefix, ai]))
+
+
+class ModelLine(str):
+    """
+    A line that represents the model name in a '.txt' file..
+    """
+    prefix: Final[str] = 'MODEL:'
+
+    def __new__(cls: Type[ModelLineInst], string: str) -> ModelLineInst:
+        if not string.startswith(cls.prefix):
+            raise TagError(f"ModelLine '{string}' is missing prefix '{cls.prefix}'")
+        instance = super().__new__(cls, string)
+        return instance
+
+    def model(self) -> str:
+        return self[len(self.prefix):].strip()
+
+    @classmethod
+    def from_model(cls: Type[ModelLineInst], model: str) -> ModelLineInst:
+        return cls(' '.join([cls.prefix, model]))
+
+
+class Question(str):
+    """
+    A single question with a defined header.
+    """
+    txt_header: ClassVar[str] = '=== QUESTION ==='
+    yaml_key: ClassVar[str] = 'question'
+
+    def __new__(cls: Type[QuestionInst], string: str) -> QuestionInst:
+        """
+        Make sure the question string does not contain the header.
+        """
+        if cls.txt_header in string:
+            raise MessageError(f"Question '{string}' contains the header '{cls.txt_header}'")
+        instance = super().__new__(cls, string)
+        return instance
+
+    @classmethod
+    def from_list(cls: Type[QuestionInst], strings: list[str]) -> QuestionInst:
+        """
+        Build Question from a list of strings. Make sure strings do not contain the header.
+        """
+        if any(cls.txt_header in string for string in strings):
+            raise MessageError(f"Question contains the header '{cls.txt_header}'")
+        instance = super().__new__(cls, '\n'.join(strings).strip())
+        return instance
+
+    def source_code(self, include_delims: bool = False) -> list[str]:
+        """
+        Extract and return all source code sections.
+        """
+        return source_code(self, include_delims)
+
+
+class Answer(str):
+    """
+    A single answer with a defined header.
+    """
+    txt_header: ClassVar[str] = '=== ANSWER ==='
+    yaml_key: ClassVar[str] = 'answer'
+
+    def __new__(cls: Type[AnswerInst], string: str) -> AnswerInst:
+        """
+        Make sure the answer string does not contain the header.
+        """
+        if cls.txt_header in string:
+            raise MessageError(f"Answer '{string}' contains the header '{cls.txt_header}'")
+        instance = super().__new__(cls, string)
+        return instance
+
+    @classmethod
+    def from_list(cls: Type[AnswerInst], strings: list[str]) -> AnswerInst:
+        """
+        Build Question from a list of strings. Make sure strings do not contain the header.
+        """
+        if any(cls.txt_header in string for string in strings):
+            raise MessageError(f"Question contains the header '{cls.txt_header}'")
+        instance = super().__new__(cls, '\n'.join(strings).strip())
+        return instance
+
+    def source_code(self, include_delims: bool = False) -> list[str]:
+        """
+        Extract and return all source code sections.
+        """
+        return source_code(self, include_delims)
+
+
+@dataclass
+class Message():
+    """
+    Single message. Consists of a question and optionally an answer, a set of tags
+    and a file path.
+    """
+    question: Question
+    answer: Optional[Answer]
+    tags: Optional[set[Tag]]
+    ai: Optional[str]
+    model: Optional[str]
+    file_path: Optional[pathlib.Path]
+    # class variables
+    file_suffixes: ClassVar[list[str]] = ['.txt', '.yaml']
+    tags_yaml_key: ClassVar[str] = 'tags'
+    file_yaml_key: ClassVar[str] = 'file_path'
+    ai_yaml_key: ClassVar[str] = 'ai'
+    model_yaml_key: ClassVar[str] = 'model'
+
+    @classmethod
+    def from_dict(cls: Type[MessageInst], data: dict[str, Any]) -> MessageInst:
+        """
+        Create a Message from the given dict.
+        """
+        return cls(question=data[Question.yaml_key],
+                   answer=data.get(Answer.yaml_key, None),
+                   tags=set(data.get(cls.tags_yaml_key, [])),
+                   ai=data.get(cls.ai_yaml_key, None),
+                   model=data.get(cls.model_yaml_key, None),
+                   file_path=data.get(cls.file_yaml_key, None))
+
+    @classmethod
+    def tags_from_file(cls: Type[MessageInst], file_path: pathlib.Path) -> set[Tag]:
+        """
+        Return only the tags from the given Message file.
+        """
+        if not file_path.exists():
+            raise MessageError(f"Message file '{file_path}' does not exist")
+        if file_path.suffix not in cls.file_suffixes:
+            raise MessageError(f"File type '{file_path.suffix}' is not supported")
+        if file_path.suffix == '.txt':
+            with open(file_path, "r") as fd:
+                tags = TagLine(fd.readline()).tags()
+        else:  # '.yaml'
+            with open(file_path, "r") as fd:
+                data = yaml.load(fd, Loader=yaml.FullLoader)
+                tags = set(sorted(data[cls.tags_yaml_key]))
+        return tags
+
+    @classmethod
+    def from_file(cls: Type[MessageInst], file_path: pathlib.Path,  # noqa: 11
+                  tags_or: Optional[set[Tag]] = None,
+                  tags_and: Optional[set[Tag]] = None,
+                  tags_not: Optional[set[Tag]] = None) -> Optional[MessageInst]:
+        """
+        Create a Message from the given file. Expects the following file structures:
+        For '.txt':
+            * TagLine [Optional]
+            * AI [Optional]
+            * Model [Optional]
+            * Question.txt_header
+            * Question
+            * Answer.txt_header [Optional]
+            # Answer [Optional]
+        For '.yaml':
+            * Question.yaml_key: single or multiline string
+            * Answer.yaml_key: single or multiline string [Optional]
+            * Message.tags_yaml_key: list of strings [Optional]
+            * Message.ai_yaml_key: str [Optional]
+            * Message.model_yaml_key: str [Optional]
+        Returns 'None' if the message does not fulfill the tag requirements.
+        """
+        if not file_path.exists():
+            raise MessageError(f"Message file '{file_path}' does not exist")
+        if file_path.suffix not in cls.file_suffixes:
+            raise MessageError(f"File type '{file_path.suffix}' is not supported")
+
+        tags: set[Tag] = set()
+        question: Question
+        answer: Optional[Answer] = None
+        ai: Optional[str] = None
+        model: Optional[str] = None
+        # TXT
+        if file_path.suffix == '.txt':
+            with open(file_path, "r") as fd:
+                # TagLine (Optional)
+                try:
+                    pos = fd.tell()
+                    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()
+                    ai = AILine(fd.readline()).ai()
+                except TagError:
+                    fd.seek(pos)
+                # ModelLine (Optional)
+                try:
+                    pos = fd.tell()
+                    model = ModelLine(fd.readline()).model()
+                except TagError:
+                    fd.seek(pos)
+                # Question and Answer
+                text = fd.read().strip().split('\n')
+                question_idx = text.index(Question.txt_header) + 1
+                try:
+                    answer_idx = text.index(Answer.txt_header)
+                    question = Question.from_list(text[question_idx:answer_idx])
+                    answer = Answer.from_list(text[answer_idx + 1:])
+                except ValueError:
+                    question = Question.from_list(text[question_idx:])
+                return cls(question, answer, tags, ai, model, file_path)
+        # YAML
+        else:
+            with open(file_path, "r") as fd:
+                data = yaml.load(fd, Loader=yaml.FullLoader)
+                if tags_or or tags_and or tags_not:
+                    if Message.tags_yaml_key in data:
+                        tags = set([Tag(tag) for tag in data[Message.tags_yaml_key]])
+                    # match with an empty set if the file has no tags
+                    if not match_tags(tags, tags_or, tags_and, tags_not):
+                        return None
+                data[cls.file_yaml_key] = file_path
+                return cls.from_dict(data)
+
+    def to_file(self, file_path: Optional[pathlib.Path]) -> None:  # noqa: 11
+        """
+        Write a Message to the given file. Creates the following file structures:
+        For '.txt':
+            * TagLine
+            * AI [Optional]
+            * Model [Optional]
+            * Question.txt_header
+            * Question
+            * Answer.txt_header
+            * Answer
+        For '.yaml':
+            * Question.yaml_key: single or multiline string
+            * Answer.yaml_key: single or multiline string
+            * Message.tags_yaml_key: list of strings
+            * Message.ai_yaml_key: str [Optional]
+            * Message.model_yaml_key: str [Optional]
+        """
+        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:
+            raise MessageError(f"File type '{self.file_path.suffix}' is not supported")
+        # TXT
+        if self.file_path.suffix == '.txt':
+            with open(self.file_path, "w") as fd:
+                msg_tags = self.tags or set()
+                fd.write(f'{TagLine.from_set(msg_tags)}\n')
+                if self.ai:
+                    fd.write(f'{AILine.from_ai(self.ai)}\n')
+                if self.model:
+                    fd.write(f'{ModelLine.from_model(self.model)}\n')
+                fd.write(f'{Question.txt_header}\n{self.question}\n')
+                fd.write(f'{Answer.txt_header}\n{self.answer}\n')
+        # YAML
+        elif self.file_path.suffix == '.yaml':
+            with open(self.file_path, "w") as fd:
+                data: YamlDict = {Question.yaml_key: str(self.question)}
+                if self.answer:
+                    data[Answer.yaml_key] = str(self.answer)
+                if self.ai:
+                    data[self.ai_yaml_key] = self.ai
+                if self.model:
+                    data[self.model_yaml_key] = self.model
+                if self.tags:
+                    data[self.tags_yaml_key] = sorted([str(tag) for tag in self.tags])
+                yaml.dump(data, fd, sort_keys=False)
+
+    def as_dict(self) -> dict[str, Any]:
+        return asdict(self)

chatmastermind/tags.py

@@ -1,7 +1,7 @@
 """
 Module implementing tag related functions and classes.
 """
-from typing import Type, TypeVar, Optional
+from typing import Type, TypeVar, Optional, Final
 
 TagInst = TypeVar('TagInst', bound='Tag')
 TagLineInst = TypeVar('TagLineInst', bound='TagLine')
@@ -16,9 +16,9 @@ class Tag(str):
     A single tag. A string that can contain anything but the default separator (' ').
     """
     # default separator
-    default_separator = ' '
+    default_separator: Final[str] = ' '
     # alternative separators (e. g. for backwards compatibility)
-    alternative_separators = [',']
+    alternative_separators: Final[list[str]] = [',']
 
     def __new__(cls: Type[TagInst], string: str) -> TagInst:
         """
@@ -93,19 +93,21 @@ def match_tags(tags: set[Tag], tags_or: Optional[set[Tag]], tags_and: Optional[s
 
 class TagLine(str):
     """
-    A line of tags. It starts with a prefix ('TAGS:'), followed by a list of tags,
+    A line of tags in a '.txt' file. It starts with a prefix ('TAGS:'), followed by
-    separated by the defaut separator (' '). Any operations on a TagLine will sort
+    a list of tags, separated by the defaut separator (' '). Any operations on a
-    the tags.
+    TagLine will sort the tags.
     """
     # the prefix
-    prefix = 'TAGS:'
+    prefix: Final[str] = 'TAGS:'
 
     def __new__(cls: Type[TagLineInst], string: str) -> TagLineInst:
         """
-        Make sure the tagline string starts with the prefix.
+        Make sure the tagline string starts with the prefix. Also replace newlines
+        and multiple spaces with ' ', in order to support multiline TagLines.
         """
         if not string.startswith(cls.prefix):
             raise TagError(f"TagLine '{string}' is missing prefix '{cls.prefix}'")
+        string = ' '.join(string.split())
         instance = super().__new__(cls, string)
         return instance
 
@@ -114,7 +116,7 @@ class TagLine(str):
         """
         Create a new TagLine from a set of tags.
         """
-        return cls(' '.join([TagLine.prefix] + sorted([t for t in tags])))
+        return cls(' '.join([cls.prefix] + sorted([t for t in tags])))
 
     def tags(self) -> set[Tag]:
         """

tests/test_main.py

@@ -7,7 +7,6 @@ from chatmastermind.main import create_parser, ask_cmd
 from chatmastermind.api_client import ai
 from chatmastermind.configuration import Config
 from chatmastermind.storage import create_chat_hist, save_answers, dump_data
-from chatmastermind.tags import Tag, TagLine, TagError
 from unittest import mock
 from unittest.mock import patch, MagicMock, Mock, ANY
 
@@ -232,116 +231,3 @@ class TestCreateParser(CmmTestCase):
             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'))
-
-
-class TestTag(CmmTestCase):
-    def test_valid_tag(self) -> None:
-        tag = Tag('mytag')
-        self.assertEqual(tag, 'mytag')
-
-    def test_invalid_tag(self) -> None:
-        with self.assertRaises(TagError):
-            Tag('tag with space')
-
-    def test_default_separator(self) -> None:
-        self.assertEqual(Tag.default_separator, ' ')
-
-    def test_alternative_separators(self) -> None:
-        self.assertEqual(Tag.alternative_separators, [','])
-
-
-class TestTagLine(CmmTestCase):
-    def test_valid_tagline(self) -> None:
-        tagline = TagLine('TAGS: tag1 tag2')
-        self.assertEqual(tagline, 'TAGS: tag1 tag2')
-
-    def test_invalid_tagline(self) -> None:
-        with self.assertRaises(TagError):
-            TagLine('tag1 tag2')
-
-    def test_prefix(self) -> None:
-        self.assertEqual(TagLine.prefix, 'TAGS:')
-
-    def test_from_set(self) -> None:
-        tags = {Tag('tag1'), Tag('tag2')}
-        tagline = TagLine.from_set(tags)
-        self.assertEqual(tagline, 'TAGS: tag1 tag2')
-
-    def test_tags(self) -> None:
-        tagline = TagLine('TAGS: tag1 tag2')
-        tags = tagline.tags()
-        self.assertEqual(tags, {Tag('tag1'), Tag('tag2')})
-
-    def test_merge(self) -> None:
-        tagline1 = TagLine('TAGS: tag1 tag2')
-        tagline2 = TagLine('TAGS: tag2 tag3')
-        merged_tagline = tagline1.merge({tagline2})
-        self.assertEqual(merged_tagline, 'TAGS: tag1 tag2 tag3')
-
-    def test_delete_tags(self) -> None:
-        tagline = TagLine('TAGS: tag1 tag2 tag3')
-        new_tagline = tagline.delete_tags({Tag('tag1'), Tag('tag3')})
-        self.assertEqual(new_tagline, 'TAGS: tag2')
-
-    def test_add_tags(self) -> None:
-        tagline = TagLine('TAGS: tag1')
-        new_tagline = tagline.add_tags({Tag('tag2'), Tag('tag3')})
-        self.assertEqual(new_tagline, 'TAGS: tag1 tag2 tag3')
-
-    def test_rename_tags(self) -> None:
-        tagline = TagLine('TAGS: old1 old2')
-        new_tagline = tagline.rename_tags({(Tag('old1'), Tag('new1')), (Tag('old2'), Tag('new2'))})
-        self.assertEqual(new_tagline, 'TAGS: new1 new2')
-
-    def test_match_tags(self) -> None:
-        tagline = TagLine('TAGS: tag1 tag2 tag3')
-
-        # Test case 1: Match any tag in 'tags_or'
-        tags_or = {Tag('tag1'), Tag('tag4')}
-        tags_and: set[Tag] = set()
-        tags_not: set[Tag] = set()
-        self.assertTrue(tagline.match_tags(tags_or, tags_and, tags_not))
-
-        # Test case 2: Match all tags in 'tags_and'
-        tags_or = set()
-        tags_and = {Tag('tag1'), Tag('tag2'), Tag('tag3')}
-        tags_not = set()
-        self.assertTrue(tagline.match_tags(tags_or, tags_and, tags_not))
-
-        # Test case 3: Match any tag in 'tags_or' and match all tags in 'tags_and'
-        tags_or = {Tag('tag1'), Tag('tag4')}
-        tags_and = {Tag('tag1'), Tag('tag2')}
-        tags_not = set()
-        self.assertTrue(tagline.match_tags(tags_or, tags_and, tags_not))
-
-        # Test case 4: Match any tag in 'tags_or', match all tags in 'tags_and', and exclude tags in 'tags_not'
-        tags_or = {Tag('tag1'), Tag('tag4')}
-        tags_and = {Tag('tag1'), Tag('tag2')}
-        tags_not = {Tag('tag5')}
-        self.assertTrue(tagline.match_tags(tags_or, tags_and, tags_not))
-
-        # Test case 5: No matching tags in 'tags_or'
-        tags_or = {Tag('tag4'), Tag('tag5')}
-        tags_and = set()
-        tags_not = set()
-        self.assertFalse(tagline.match_tags(tags_or, tags_and, tags_not))
-
-        # Test case 6: Not all tags in 'tags_and' are present
-        tags_or = set()
-        tags_and = {Tag('tag1'), Tag('tag2'), Tag('tag3'), Tag('tag4')}
-        tags_not = set()
-        self.assertFalse(tagline.match_tags(tags_or, tags_and, tags_not))
-
-        # Test case 7: Some tags in 'tags_not' are present
-        tags_or = {Tag('tag1')}
-        tags_and = set()
-        tags_not = {Tag('tag2')}
-        self.assertFalse(tagline.match_tags(tags_or, tags_and, tags_not))
-
-        # Test case 8: 'tags_or' and 'tags_and' are None, match all tags
-        tags_not = set()
-        self.assertTrue(tagline.match_tags(None, None, tags_not))
-
-        # Test case 9: 'tags_or' and 'tags_and' are None, match all tags except excluded tags
-        tags_not = {Tag('tag2')}
-        self.assertFalse(tagline.match_tags(None, None, tags_not))

tests/test_message.py

@@ -0,0 +1,391 @@
+import pathlib
+import tempfile
+from typing import cast
+from .test_main import CmmTestCase
+from chatmastermind.message import source_code, Message, MessageError, Question, Answer, AILine, ModelLine
+from chatmastermind.tags import Tag, TagLine
+
+
+class SourceCodeTestCase(CmmTestCase):
+    def test_source_code_with_include_delims(self) -> None:
+        text = """
+        Some text before the code block
+        ```python
+        print("Hello, World!")
+        ```
+        Some text after the code block
+        ```python
+        x = 10
+        y = 20
+        print(x + y)
+        ```
+        """
+        expected_result = [
+            "        ```python\n        print(\"Hello, World!\")\n        ```\n",
+            "        ```python\n        x = 10\n        y = 20\n        print(x + y)\n        ```\n"
+        ]
+        result = source_code(text, include_delims=True)
+        self.assertEqual(result, expected_result)
+
+    def test_source_code_without_include_delims(self) -> None:
+        text = """
+        Some text before the code block
+        ```python
+        print("Hello, World!")
+        ```
+        Some text after the code block
+        ```python
+        x = 10
+        y = 20
+        print(x + y)
+        ```
+        """
+        expected_result = [
+            "        print(\"Hello, World!\")\n",
+            "        x = 10\n        y = 20\n        print(x + y)\n"
+        ]
+        result = source_code(text, include_delims=False)
+        self.assertEqual(result, expected_result)
+
+    def test_source_code_with_single_code_block(self) -> None:
+        text = "```python\nprint(\"Hello, World!\")\n```"
+        expected_result = ["```python\nprint(\"Hello, World!\")\n```\n"]
+        result = source_code(text, include_delims=True)
+        self.assertEqual(result, expected_result)
+
+    def test_source_code_with_no_code_blocks(self) -> None:
+        text = "Some text without any code blocks"
+        expected_result: list[str] = []
+        result = source_code(text, include_delims=True)
+        self.assertEqual(result, expected_result)
+
+
+class QuestionTestCase(CmmTestCase):
+    def test_question_with_prefix(self) -> None:
+        with self.assertRaises(MessageError):
+            Question("=== QUESTION === What is your name?")
+
+    def test_question_without_prefix(self) -> None:
+        question = Question("What is your favorite color?")
+        self.assertIsInstance(question, Question)
+        self.assertEqual(question, "What is your favorite color?")
+
+
+class AnswerTestCase(CmmTestCase):
+    def test_answer_with_prefix(self) -> None:
+        with self.assertRaises(MessageError):
+            Answer("=== ANSWER === Yes")
+
+    def test_answer_without_prefix(self) -> None:
+        answer = Answer("No")
+        self.assertIsInstance(answer, Answer)
+        self.assertEqual(answer, "No")
+
+
+class MessageToFileTxtTestCase(CmmTestCase):
+    def setUp(self) -> None:
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file_path = pathlib.Path(self.file.name)
+        self.message = Message(Question('This is a question.'),
+                               Answer('This is an answer.'),
+                               {Tag('tag1'), Tag('tag2')},
+                               ai='ChatGPT',
+                               model='gpt-3.5-turbo',
+                               file_path=self.file_path)
+
+    def tearDown(self) -> None:
+        self.file.close()
+        self.file_path.unlink()
+
+    def test_to_file_txt(self) -> None:
+        self.message.to_file(self.file_path)
+
+        with open(self.file_path, "r") as fd:
+            content = fd.read()
+        expected_content = f"""{TagLine.prefix} tag1 tag2
+{AILine.prefix} ChatGPT
+{ModelLine.prefix} gpt-3.5-turbo
+{Question.txt_header}
+This is a question.
+{Answer.txt_header}
+This is an answer.
+"""
+        self.assertEqual(content, expected_content)
+
+    def test_to_file_unsupported_file_type(self) -> None:
+        unsupported_file_path = pathlib.Path("example.doc")
+        with self.assertRaises(MessageError) as cm:
+            self.message.to_file(unsupported_file_path)
+        self.assertEqual(str(cm.exception), "File type '.doc' is not supported")
+
+    def test_to_file_no_file_path(self) -> None:
+        """
+        Provoke an exception using an empty path.
+        """
+        with self.assertRaises(MessageError) as cm:
+            # clear the internal file_path
+            self.message.file_path = None
+            self.message.to_file(None)
+        self.assertEqual(str(cm.exception), "Got no valid path to write message")
+        # reset the internal file_path
+        self.message.file_path = self.file_path
+
+
+class MessageToFileYamlTestCase(CmmTestCase):
+    def setUp(self) -> None:
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file_path = pathlib.Path(self.file.name)
+        self.message = Message(Question('This is a question.'),
+                               Answer('This is an answer.'),
+                               {Tag('tag1'), Tag('tag2')},
+                               ai='ChatGPT',
+                               model='gpt-3.5-turbo',
+                               file_path=self.file_path)
+        self.message_multiline = Message(Question('This is a\nmultiline question.'),
+                                         Answer('This is a\nmultiline answer.'),
+                                         {Tag('tag1'), Tag('tag2')},
+                                         ai='ChatGPT',
+                                         model='gpt-3.5-turbo',
+                                         file_path=self.file_path)
+
+    def tearDown(self) -> None:
+        self.file.close()
+        self.file_path.unlink()
+
+    def test_to_file_yaml(self) -> None:
+        self.message.to_file(self.file_path)
+
+        with open(self.file_path, "r") as fd:
+            content = fd.read()
+        expected_content = f"""{Question.yaml_key}: This is a question.
+{Answer.yaml_key}: This is an answer.
+{Message.ai_yaml_key}: ChatGPT
+{Message.model_yaml_key}: gpt-3.5-turbo
+{Message.tags_yaml_key}:
+- tag1
+- tag2
+"""
+        self.assertEqual(content, expected_content)
+
+    def test_to_file_yaml_multiline(self) -> None:
+        self.message_multiline.to_file(self.file_path)
+
+        with open(self.file_path, "r") as fd:
+            content = fd.read()
+        expected_content = f"""{Question.yaml_key}: |-
+  This is a
+  multiline question.
+{Answer.yaml_key}: |-
+  This is a
+  multiline answer.
+{Message.ai_yaml_key}: ChatGPT
+{Message.model_yaml_key}: gpt-3.5-turbo
+{Message.tags_yaml_key}:
+- tag1
+- tag2
+"""
+        self.assertEqual(content, expected_content)
+
+
+class MessageFromFileTxtTestCase(CmmTestCase):
+    def setUp(self) -> None:
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        self.file_path = pathlib.Path(self.file.name)
+        with open(self.file_path, "w") as fd:
+            fd.write(f"""{TagLine.prefix} tag1 tag2
+{Question.txt_header}
+This is a question.
+{Answer.txt_header}
+This is an answer.
+""")
+        self.file_min = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        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}
+This is a question.
+""")
+
+    def tearDown(self) -> None:
+        self.file.close()
+        self.file_min.close()
+        self.file_path.unlink()
+        self.file_path_min.unlink()
+
+    def test_from_file_txt_complete(self) -> None:
+        """
+        Read a complete message (with all optional values).
+        """
+        message = Message.from_file(self.file_path)
+        self.assertIsNotNone(message)
+        self.assertIsInstance(message, Message)
+        if message:  # mypy bug
+            self.assertEqual(message.question, 'This is a question.')
+            self.assertEqual(message.answer, 'This is an answer.')
+            self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
+            self.assertEqual(message.file_path, self.file_path)
+
+    def test_from_file_txt_min(self) -> None:
+        """
+        Read a message with only required values.
+        """
+        message = Message.from_file(self.file_path_min)
+        self.assertIsNotNone(message)
+        self.assertIsInstance(message, Message)
+        if message:  # mypy bug
+            self.assertEqual(message.question, 'This is a question.')
+            self.assertEqual(message.file_path, self.file_path_min)
+            self.assertIsNone(message.answer)
+
+    def test_from_file_txt_tags_match(self) -> None:
+        message = Message.from_file(self.file_path, tags_or={Tag('tag1')})
+        self.assertIsNotNone(message)
+        self.assertIsInstance(message, Message)
+        if message:  # mypy bug
+            self.assertEqual(message.question, 'This is a question.')
+            self.assertEqual(message.answer, 'This is an answer.')
+            self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
+            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, tags_or={Tag('tag3')})
+        self.assertIsNone(message)
+
+    def test_from_file_txt_no_tags_dont_match(self) -> None:
+        message = Message.from_file(self.file_path_min, tags_or={Tag('tag1')})
+        self.assertIsNone(message)
+
+    def test_from_file_txt_no_tags_match_tags_not(self) -> None:
+        message = Message.from_file(self.file_path_min, tags_not={Tag('tag1')})
+        self.assertIsNotNone(message)
+        self.assertIsInstance(message, Message)
+        if message:  # mypy bug
+            self.assertEqual(message.question, 'This is a question.')
+            self.assertSetEqual(cast(set[Tag], message.tags), set())
+            self.assertEqual(message.file_path, self.file_path_min)
+
+    def test_from_file_not_exists(self) -> None:
+        file_not_exists = pathlib.Path("example.txt")
+        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")
+
+
+class MessageFromFileYamlTestCase(CmmTestCase):
+    def setUp(self) -> None:
+        self.file = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file_path = pathlib.Path(self.file.name)
+        with open(self.file_path, "w") as fd:
+            fd.write(f"""
+{Question.yaml_key}: |-
+  This is a question.
+{Answer.yaml_key}: |-
+  This is an answer.
+{Message.tags_yaml_key}:
+  - tag1
+  - tag2
+""")
+        self.file_min = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file_path_min = pathlib.Path(self.file_min.name)
+        with open(self.file_path_min, "w") as fd:
+            fd.write(f"""
+{Question.yaml_key}: |-
+  This is a question.
+""")
+
+    def tearDown(self) -> None:
+        self.file.close()
+        self.file_path.unlink()
+        self.file_min.close()
+        self.file_path_min.unlink()
+
+    def test_from_file_yaml_complete(self) -> None:
+        """
+        Read a complete message (with all optional values).
+        """
+        message = Message.from_file(self.file_path)
+        self.assertIsInstance(message, Message)
+        self.assertIsNotNone(message)
+        if message:  # mypy bug
+            self.assertEqual(message.question, 'This is a question.')
+            self.assertEqual(message.answer, 'This is an answer.')
+            self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
+            self.assertEqual(message.file_path, self.file_path)
+
+    def test_from_file_yaml_min(self) -> None:
+        """
+        Read a message with only the required values.
+        """
+        message = Message.from_file(self.file_path_min)
+        self.assertIsInstance(message, Message)
+        self.assertIsNotNone(message)
+        if message:  # mypy bug
+            self.assertEqual(message.question, 'This is a question.')
+            self.assertSetEqual(cast(set[Tag], message.tags), set())
+            self.assertEqual(message.file_path, self.file_path_min)
+            self.assertIsNone(message.answer)
+
+    def test_from_file_not_exists(self) -> None:
+        file_not_exists = pathlib.Path("example.yaml")
+        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")
+
+    def test_from_file_yaml_tags_match(self) -> None:
+        message = Message.from_file(self.file_path, tags_or={Tag('tag1')})
+        self.assertIsNotNone(message)
+        self.assertIsInstance(message, Message)
+        if message:  # mypy bug
+            self.assertEqual(message.question, 'This is a question.')
+            self.assertEqual(message.answer, 'This is an answer.')
+            self.assertSetEqual(cast(set[Tag], message.tags), {Tag('tag1'), Tag('tag2')})
+            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, tags_or={Tag('tag3')})
+        self.assertIsNone(message)
+
+    def test_from_file_yaml_no_tags_dont_match(self) -> None:
+        message = Message.from_file(self.file_path_min, tags_or={Tag('tag1')})
+        self.assertIsNone(message)
+
+    def test_from_file_yaml_no_tags_match_tags_not(self) -> None:
+        message = Message.from_file(self.file_path_min, tags_not={Tag('tag1')})
+        self.assertIsNotNone(message)
+        self.assertIsInstance(message, Message)
+        if message:  # mypy bug
+            self.assertEqual(message.question, 'This is a question.')
+            self.assertSetEqual(cast(set[Tag], message.tags), set())
+            self.assertEqual(message.file_path, self.file_path_min)
+
+
+class TagsFromFileTestCase(CmmTestCase):
+    def setUp(self) -> None:
+        self.file_txt = tempfile.NamedTemporaryFile(delete=False, suffix='.txt')
+        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
+{Question.txt_header}
+This is a question.
+{Answer.txt_header}
+This is an answer.
+""")
+        self.file_yaml = tempfile.NamedTemporaryFile(delete=False, suffix='.yaml')
+        self.file_path_yaml = pathlib.Path(self.file_yaml.name)
+        with open(self.file_path_yaml, "w") as fd:
+            fd.write(f"""
+{Question.yaml_key}: |-
+  This is a question.
+{Answer.yaml_key}: |-
+  This is an answer.
+{Message.tags_yaml_key}:
+  - tag1
+  - tag2
+""")
+
+    def test_tags_from_file_txt(self) -> None:
+        tags = Message.tags_from_file(self.file_path_txt)
+        self.assertSetEqual(tags, {Tag('tag1'), Tag('tag2')})
+
+    def test_tags_from_file_yaml(self) -> None:
+        tags = Message.tags_from_file(self.file_path_yaml)
+        self.assertSetEqual(tags, {Tag('tag1'), Tag('tag2')})

tests/test_tags.py

@@ -0,0 +1,124 @@
+from .test_main import CmmTestCase
+from chatmastermind.tags import Tag, TagLine, TagError
+
+
+class TestTag(CmmTestCase):
+    def test_valid_tag(self) -> None:
+        tag = Tag('mytag')
+        self.assertEqual(tag, 'mytag')
+
+    def test_invalid_tag(self) -> None:
+        with self.assertRaises(TagError):
+            Tag('tag with space')
+
+    def test_default_separator(self) -> None:
+        self.assertEqual(Tag.default_separator, ' ')
+
+    def test_alternative_separators(self) -> None:
+        self.assertEqual(Tag.alternative_separators, [','])
+
+
+class TestTagLine(CmmTestCase):
+    def test_valid_tagline(self) -> None:
+        tagline = TagLine('TAGS: tag1 tag2')
+        self.assertEqual(tagline, 'TAGS: tag1 tag2')
+
+    def test_valid_tagline_with_newline(self) -> None:
+        tagline = TagLine('TAGS: tag1\n tag2')
+        self.assertEqual(tagline, 'TAGS: tag1 tag2')
+
+    def test_invalid_tagline(self) -> None:
+        with self.assertRaises(TagError):
+            TagLine('tag1 tag2')
+
+    def test_prefix(self) -> None:
+        self.assertEqual(TagLine.prefix, 'TAGS:')
+
+    def test_from_set(self) -> None:
+        tags = {Tag('tag1'), Tag('tag2')}
+        tagline = TagLine.from_set(tags)
+        self.assertEqual(tagline, 'TAGS: tag1 tag2')
+
+    def test_tags(self) -> None:
+        tagline = TagLine('TAGS: tag1 tag2')
+        tags = tagline.tags()
+        self.assertEqual(tags, {Tag('tag1'), Tag('tag2')})
+
+    def test_tags_with_newline(self) -> None:
+        tagline = TagLine('TAGS: tag1\n tag2')
+        tags = tagline.tags()
+        self.assertEqual(tags, {Tag('tag1'), Tag('tag2')})
+
+    def test_merge(self) -> None:
+        tagline1 = TagLine('TAGS: tag1 tag2')
+        tagline2 = TagLine('TAGS: tag2 tag3')
+        merged_tagline = tagline1.merge({tagline2})
+        self.assertEqual(merged_tagline, 'TAGS: tag1 tag2 tag3')
+
+    def test_delete_tags(self) -> None:
+        tagline = TagLine('TAGS: tag1 tag2 tag3')
+        new_tagline = tagline.delete_tags({Tag('tag1'), Tag('tag3')})
+        self.assertEqual(new_tagline, 'TAGS: tag2')
+
+    def test_add_tags(self) -> None:
+        tagline = TagLine('TAGS: tag1')
+        new_tagline = tagline.add_tags({Tag('tag2'), Tag('tag3')})
+        self.assertEqual(new_tagline, 'TAGS: tag1 tag2 tag3')
+
+    def test_rename_tags(self) -> None:
+        tagline = TagLine('TAGS: old1 old2')
+        new_tagline = tagline.rename_tags({(Tag('old1'), Tag('new1')), (Tag('old2'), Tag('new2'))})
+        self.assertEqual(new_tagline, 'TAGS: new1 new2')
+
+    def test_match_tags(self) -> None:
+        tagline = TagLine('TAGS: tag1 tag2 tag3')
+
+        # Test case 1: Match any tag in 'tags_or'
+        tags_or = {Tag('tag1'), Tag('tag4')}
+        tags_and: set[Tag] = set()
+        tags_not: set[Tag] = set()
+        self.assertTrue(tagline.match_tags(tags_or, tags_and, tags_not))
+
+        # Test case 2: Match all tags in 'tags_and'
+        tags_or = set()
+        tags_and = {Tag('tag1'), Tag('tag2'), Tag('tag3')}
+        tags_not = set()
+        self.assertTrue(tagline.match_tags(tags_or, tags_and, tags_not))
+
+        # Test case 3: Match any tag in 'tags_or' and match all tags in 'tags_and'
+        tags_or = {Tag('tag1'), Tag('tag4')}
+        tags_and = {Tag('tag1'), Tag('tag2')}
+        tags_not = set()
+        self.assertTrue(tagline.match_tags(tags_or, tags_and, tags_not))
+
+        # Test case 4: Match any tag in 'tags_or', match all tags in 'tags_and', and exclude tags in 'tags_not'
+        tags_or = {Tag('tag1'), Tag('tag4')}
+        tags_and = {Tag('tag1'), Tag('tag2')}
+        tags_not = {Tag('tag5')}
+        self.assertTrue(tagline.match_tags(tags_or, tags_and, tags_not))
+
+        # Test case 5: No matching tags in 'tags_or'
+        tags_or = {Tag('tag4'), Tag('tag5')}
+        tags_and = set()
+        tags_not = set()
+        self.assertFalse(tagline.match_tags(tags_or, tags_and, tags_not))
+
+        # Test case 6: Not all tags in 'tags_and' are present
+        tags_or = set()
+        tags_and = {Tag('tag1'), Tag('tag2'), Tag('tag3'), Tag('tag4')}
+        tags_not = set()
+        self.assertFalse(tagline.match_tags(tags_or, tags_and, tags_not))
+
+        # Test case 7: Some tags in 'tags_not' are present
+        tags_or = {Tag('tag1')}
+        tags_and = set()
+        tags_not = {Tag('tag2')}
+        self.assertFalse(tagline.match_tags(tags_or, tags_and, tags_not))
+
+        # Test case 8: 'tags_or' and 'tags_and' are None, match all tags
+        tags_not = set()
+        self.assertTrue(tagline.match_tags(None, None, tags_not))
+
+        # Test case 9: 'tags_or' and 'tags_and' are None, match all tags except excluded tags
+        tags_not = {Tag('tag2')}
+        self.assertFalse(tagline.match_tags(None, None, tags_not))