Get the local path to the statute

[justmars]

• input: category and identifier
• output: local path

[justmars]

See former implementation:

...
    def get_path(self, path: Path) -> Path | None:
        target = path / self.statute_category / self.statute_serial_id
        if target.exists():
            return target
        return None

    def get_paths(self, path: Path) -> list[Path]:
        """The serial id isn't enough since the variant of a `StatuteRow.id` includes a `-<digit>` where the digit is the variant."""
        targets = []
        target = path / self.statute_category
        paths = target.glob(f"{self.statute_serial_id}-*/details.yaml")
        for variant_path in paths:
            if variant_path.exists():
                targets.append(variant_path.parent)
        return targets

    def extract_folders(self, statute_path: Path) -> Iterator[Path]:
        """Using the `category` and `id` of the object, get the possible folder paths."""
        if folder := self.get_path(statute_path):
            yield folder
        else:
            if folders := self.get_paths(statute_path):
                yield from folders
            else:
                logger.error(f"No statute path/s detected for {self=}")

    def units_path(self, folder: Path) -> Path | None:
        """There are two kinds of unit files: the preferred / customized
        variant and the one scraped (the default in the absence of a preferred
        variant)."""
        text = f"{self.statute_category}{self.statute_serial_id}.yaml"
        preferred = folder / text
        if preferred.exists():
            return preferred

        default = folder / "units.yaml"
        if default.exists():
            return default

        return None