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"""Grab the global logger instance."""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from __future__ import annotations
import logging
from typing import Any
_logger: logging.Logger | logging.LoggerAdapter[Any] | None = None
def get_logger() -> logging.Logger | logging.LoggerAdapter[Any]:
"""Grab the global logger instance.
If a global Application is instantiated, grab its logger.
Otherwise, grab the root logger.
"""
global _logger # noqa: PLW0603
if _logger is None:
from .config import Application
if Application.initialized():
_logger = Application.instance().log
else:
_logger = logging.getLogger("traitlets")
# Add a NullHandler to silence warnings about not being
# initialized, per best practice for libraries.
_logger.addHandler(logging.NullHandler())
return _logger
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