import importlib.machinery


class RedError(Exception):
    """Base error class for Red-related errors."""


class PackageAlreadyLoaded(RedError):
    """Raised when trying to load an already-loaded package."""

    def __init__(self, spec: importlib.machinery.ModuleSpec, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.spec: importlib.machinery.ModuleSpec = spec

    def __str__(self) -> str:
        return f"There is already a package named {self.spec.name.split('.')[-1]} loaded"