template_versioning

trestle.core.commands.author.versioning.template_versioning

A Template Versioning.

logger

Classes

TemplateVersioning

Template versioning solution.

1. Load template with a specified version.
   1. Template version can be specified via -tv flag
   2. If no version specified the latest version will be used by default.
   3. Otherwise use the templates from the specified version.
2. Backward compatibility.
   1. Version 0.0.1 will be reserved for the template versions prior to this change.
   2. If the old template path is detected (i.e. without the template version). then the filesystem will be updated to the new path with the version.
   3. Upon first run, old template versions prior to this change will be placed to the folder 0.0.1.
   4. If templates have no headers then 0.0.1 version will be used.
3. Versioning organization.
   1. Template and instance version is added both: in the file system (via path) and in the headers or metadata.
4. Instance version validation.
   1. Markdown:
      1. When validating the instance the header will be used to validate the version.
   2. Drawio:
      1. When validating the instance the metadata will be used to validate the version.

Source code in trestle/core/commands/author/versioning/template_versioning.py

class TemplateVersioning:
    """
    Template versioning solution.

    1. Load template with a specified version.
        1. Template version can be specified via -tv flag
        2. If no version specified the latest version will be used by default.
        3. Otherwise use the templates from the specified version.
    2. Backward compatibility.
        1. Version 0.0.1 will be reserved for the template versions prior to this change.
        2. If the old template path is detected (i.e. without the template version).
            then the filesystem will be updated to the new path with the version.
        3. Upon first run, old template versions prior to this change will be placed to the folder 0.0.1.
        4. If templates have no headers then 0.0.1 version will be used.
    3. Versioning organization.
        1. Template and instance version is added both: in the file system (via path) and in the headers or metadata.
    4. Instance version validation.
        1. Markdown:
            1. When validating the instance the header will be used to validate the version.
        2. Drawio:
            1. When validating the instance the metadata will be used to validate the version.
    """

    @staticmethod
    def update_template_folder_structure(task_path: Path) -> None:
        """
        Automatically detect whether the path is an old style and update it.

        An old-style path is a path of the form:
         root_folder/.trestle/author/{template_name}/{template_objects}
        The new version path is a path of the form:
         root_folder/.trestle/author/{template_name}/{version}/{template_objects}
        By default all old-style templates will be updated to version 0.0.1
        """
        TemplateVersioning._check_if_exists_and_dir(task_path)

        try:
            all_files_wo_version = list(
                filter(lambda p: p.is_file(), file_utils.iterdir_without_hidden_files(task_path))
            )

            pattern = re.compile(TEMPLATE_VERSION_REGEX)
            all_non_template_directories = list(
                filter(
                    lambda p: p.is_dir() and pattern.search(p.parts[-1]) is None,
                    file_utils.iterdir_without_hidden_files(task_path)
                )
            )

            new_dir = Path(f'{task_path}/{START_TEMPLATE_VERSION}')
            new_dir.mkdir(parents=True, exist_ok=True)

            if len(all_files_wo_version) == 0:
                logger.debug('No templates outside of the version folders.')
                # if the base template folder is empty, delete it
                if len(list(new_dir.iterdir())) == 0:
                    new_dir.rmdir()

            for f in all_files_wo_version + all_non_template_directories:
                if f.is_file():
                    shutil.copy(f, new_dir)
                elif f.is_dir():
                    shutil.copytree(f, new_dir / f.name)

            for p in all_files_wo_version + all_non_template_directories:
                if p.is_dir():
                    shutil.rmtree(p)
                else:
                    p.unlink()

        except OSError as e:
            raise TrestleError(f'Error while updating template folder: {e}')
        except Exception as e:
            raise TrestleError(f'Unexpected error while updating template folder: {e}')

    @staticmethod
    def get_versioned_template_dir(task_path: Path, version: Optional[str] = None) -> Path:
        """
        Get a template folder of the specified version.

        If no version is given, the latest version of template will be returned
        """
        TemplateVersioning._check_if_exists_and_dir(task_path)
        latest_path = None
        if version is None:
            latest_path, _ = TemplateVersioning.get_latest_version_for_task(task_path)
        else:
            latest_path = Path(f'{task_path}/{version}/')

        if not latest_path.exists():
            raise TrestleError(f'The task: {task_path} with version: {version} does not exists.')

        return latest_path

    @staticmethod
    def get_latest_version_for_task(task_path: Path) -> Tuple[Path, str]:
        """Get latest version of the template for the given task."""
        TemplateVersioning._check_if_exists_and_dir(task_path)

        all_versions = TemplateVersioning.get_all_versions_for_task(task_path)
        max_version = START_TEMPLATE_VERSION

        if len(all_versions) == 0:
            logger.debug(f'No template versions were found for task: {task_path}, defaulting to 0.0.1')
            max_version = START_TEMPLATE_VERSION
        else:
            max_version = max(all_versions)

        latest_path = Path(f'{task_path}/{max_version}')

        return latest_path, max_version

    @staticmethod
    def get_all_versions_for_task(task_path: Path) -> List[str]:
        """Get all versions for the task."""
        pattern = re.compile(TEMPLATE_VERSION_REGEX)
        all_versions = []
        max_version = START_TEMPLATE_VERSION
        for p in task_path.iterdir():
            if p.is_dir() and pattern.search(p.parts[-1]) is not None:
                match = pattern.search(p.parts[-1]).string
                all_versions.append(match)
                if match > max_version:
                    max_version = match

        return all_versions

    @staticmethod
    def write_versioned_template(
        resource_name: str, task_path: Path, target_file: Path, version: Optional[str] = None
    ) -> None:
        """
        Write a template with the header or metadata of a specified version.

        If no version was given the latest version for the task will be used.

        Args:
            resource_name:  Template resource name
            task_path: Task path
            target_file: File path where template will be written
            version: return a resource of a specific version

        Returns:
            A dotted path of a versioned template, list of all available versions
        """
        TemplateVersioning._check_if_exists_and_dir(task_path)
        try:
            templates_resource_path = TRESTLE_RESOURCES + '.templates'

            generic_template = Path(resource_filename(templates_resource_path, resource_name)).resolve()
            if version is None:
                _, version = TemplateVersioning.get_latest_version_for_task(task_path)

            # modify header/metadata in the template
            if generic_template.suffix == MARKDOWN_FILE_EXT:
                md_api = MarkdownAPI()
                header, md_body = md_api.processor.read_markdown_wo_processing(generic_template)
                header[TEMPLATE_VERSION_HEADER] = version
                md_api.write_markdown_with_header(target_file, header, md_body)
                logger.debug(f'Successfully written template markdown to {target_file}')
            elif generic_template.suffix == DRAWIO_FILE_EXT:
                drawio = DrawIO(generic_template)
                metadata = drawio.get_metadata()[0]
                metadata[TEMPLATE_VERSION_HEADER] = version

                drawio.write_drawio_with_metadata(generic_template, metadata, 0, target_file)
                logger.debug(f'Successfully written template drawio to {target_file}')
            else:
                raise TrestleError(f'Unsupported template file extension {generic_template.suffix}')
        except OSError as e:
            raise TrestleError(f'Error while updating template folder: {e}')

    @staticmethod
    def is_valid_version(template_version: str) -> bool:
        """Check if the version format is correct."""
        if template_version is None:
            return True  # we can have empty version
        if template_version == '0.0.0':
            return False
        version_regex = r'^[0-9]+.[0-9]+.[0-9]+$'
        pattern = re.compile(version_regex)
        if pattern.search(template_version):
            return True
        else:
            return False

    @staticmethod
    def _check_if_exists_and_dir(task_path: Path) -> None:
        if not task_path.exists():
            raise TrestleError(f'Path: {task_path} does not exists.')

        if not task_path.is_dir():
            raise TrestleError(f'File {task_path} passed, however template directory is expected.')

Methods

get_all_versions_for_task(task_path) staticmethod

Get all versions for the task.

Source code in trestle/core/commands/author/versioning/template_versioning.py

@staticmethod
def get_all_versions_for_task(task_path: Path) -> List[str]:
    """Get all versions for the task."""
    pattern = re.compile(TEMPLATE_VERSION_REGEX)
    all_versions = []
    max_version = START_TEMPLATE_VERSION
    for p in task_path.iterdir():
        if p.is_dir() and pattern.search(p.parts[-1]) is not None:
            match = pattern.search(p.parts[-1]).string
            all_versions.append(match)
            if match > max_version:
                max_version = match

    return all_versions

get_latest_version_for_task(task_path) staticmethod

Get latest version of the template for the given task.

Source code in trestle/core/commands/author/versioning/template_versioning.py

@staticmethod
def get_latest_version_for_task(task_path: Path) -> Tuple[Path, str]:
    """Get latest version of the template for the given task."""
    TemplateVersioning._check_if_exists_and_dir(task_path)

    all_versions = TemplateVersioning.get_all_versions_for_task(task_path)
    max_version = START_TEMPLATE_VERSION

    if len(all_versions) == 0:
        logger.debug(f'No template versions were found for task: {task_path}, defaulting to 0.0.1')
        max_version = START_TEMPLATE_VERSION
    else:
        max_version = max(all_versions)

    latest_path = Path(f'{task_path}/{max_version}')

    return latest_path, max_version

get_versioned_template_dir(task_path, version=None) staticmethod

Get a template folder of the specified version.

If no version is given, the latest version of template will be returned

Source code in trestle/core/commands/author/versioning/template_versioning.py

@staticmethod
def get_versioned_template_dir(task_path: Path, version: Optional[str] = None) -> Path:
    """
    Get a template folder of the specified version.

    If no version is given, the latest version of template will be returned
    """
    TemplateVersioning._check_if_exists_and_dir(task_path)
    latest_path = None
    if version is None:
        latest_path, _ = TemplateVersioning.get_latest_version_for_task(task_path)
    else:
        latest_path = Path(f'{task_path}/{version}/')

    if not latest_path.exists():
        raise TrestleError(f'The task: {task_path} with version: {version} does not exists.')

    return latest_path

is_valid_version(template_version) staticmethod

Check if the version format is correct.

Source code in trestle/core/commands/author/versioning/template_versioning.py

@staticmethod
def is_valid_version(template_version: str) -> bool:
    """Check if the version format is correct."""
    if template_version is None:
        return True  # we can have empty version
    if template_version == '0.0.0':
        return False
    version_regex = r'^[0-9]+.[0-9]+.[0-9]+$'
    pattern = re.compile(version_regex)
    if pattern.search(template_version):
        return True
    else:
        return False

update_template_folder_structure(task_path) staticmethod

Automatically detect whether the path is an old style and update it.

An old-style path is a path of the form: root_folder/.trestle/author/{template_name}/{template_objects} The new version path is a path of the form: root_folder/.trestle/author/{template_name}/{version}/{template_objects} By default all old-style templates will be updated to version 0.0.1

Source code in trestle/core/commands/author/versioning/template_versioning.py

@staticmethod
def update_template_folder_structure(task_path: Path) -> None:
    """
    Automatically detect whether the path is an old style and update it.

    An old-style path is a path of the form:
     root_folder/.trestle/author/{template_name}/{template_objects}
    The new version path is a path of the form:
     root_folder/.trestle/author/{template_name}/{version}/{template_objects}
    By default all old-style templates will be updated to version 0.0.1
    """
    TemplateVersioning._check_if_exists_and_dir(task_path)

    try:
        all_files_wo_version = list(
            filter(lambda p: p.is_file(), file_utils.iterdir_without_hidden_files(task_path))
        )

        pattern = re.compile(TEMPLATE_VERSION_REGEX)
        all_non_template_directories = list(
            filter(
                lambda p: p.is_dir() and pattern.search(p.parts[-1]) is None,
                file_utils.iterdir_without_hidden_files(task_path)
            )
        )

        new_dir = Path(f'{task_path}/{START_TEMPLATE_VERSION}')
        new_dir.mkdir(parents=True, exist_ok=True)

        if len(all_files_wo_version) == 0:
            logger.debug('No templates outside of the version folders.')
            # if the base template folder is empty, delete it
            if len(list(new_dir.iterdir())) == 0:
                new_dir.rmdir()

        for f in all_files_wo_version + all_non_template_directories:
            if f.is_file():
                shutil.copy(f, new_dir)
            elif f.is_dir():
                shutil.copytree(f, new_dir / f.name)

        for p in all_files_wo_version + all_non_template_directories:
            if p.is_dir():
                shutil.rmtree(p)
            else:
                p.unlink()

    except OSError as e:
        raise TrestleError(f'Error while updating template folder: {e}')
    except Exception as e:
        raise TrestleError(f'Unexpected error while updating template folder: {e}')

write_versioned_template(resource_name, task_path, target_file, version=None) staticmethod

Write a template with the header or metadata of a specified version.

If no version was given the latest version for the task will be used.

Parameters:

Name	Type	Description	Default
resource_name	str	Template resource name	required
task_path	Path	Task path	required
target_file	Path	File path where template will be written	required
version	Optional[str]	return a resource of a specific version	None

Returns:

Type	Description
None	A dotted path of a versioned template, list of all available versions

Source code in trestle/core/commands/author/versioning/template_versioning.py

@staticmethod
def write_versioned_template(
    resource_name: str, task_path: Path, target_file: Path, version: Optional[str] = None
) -> None:
    """
    Write a template with the header or metadata of a specified version.

    If no version was given the latest version for the task will be used.

    Args:
        resource_name:  Template resource name
        task_path: Task path
        target_file: File path where template will be written
        version: return a resource of a specific version

    Returns:
        A dotted path of a versioned template, list of all available versions
    """
    TemplateVersioning._check_if_exists_and_dir(task_path)
    try:
        templates_resource_path = TRESTLE_RESOURCES + '.templates'

        generic_template = Path(resource_filename(templates_resource_path, resource_name)).resolve()
        if version is None:
            _, version = TemplateVersioning.get_latest_version_for_task(task_path)

        # modify header/metadata in the template
        if generic_template.suffix == MARKDOWN_FILE_EXT:
            md_api = MarkdownAPI()
            header, md_body = md_api.processor.read_markdown_wo_processing(generic_template)
            header[TEMPLATE_VERSION_HEADER] = version
            md_api.write_markdown_with_header(target_file, header, md_body)
            logger.debug(f'Successfully written template markdown to {target_file}')
        elif generic_template.suffix == DRAWIO_FILE_EXT:
            drawio = DrawIO(generic_template)
            metadata = drawio.get_metadata()[0]
            metadata[TEMPLATE_VERSION_HEADER] = version

            drawio.write_drawio_with_metadata(generic_template, metadata, 0, target_file)
            logger.debug(f'Successfully written template drawio to {target_file}')
        else:
            raise TrestleError(f'Unsupported template file extension {generic_template.suffix}')
    except OSError as e:
        raise TrestleError(f'Error while updating template folder: {e}')

handler: python