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"""Top-level module for Flake8.
This module
- initializes logging for the command-line tool
- tracks the version of the package
- provides a way to configure logging for the command-line tool
.. autofunction:: flake8.configure_logging
"""
import logging
import sys
from typing import Optional
from typing import Type
LOG = logging.getLogger(__name__)
LOG.addHandler(logging.NullHandler())
__version__ = "5.0.4"
__version_info__ = tuple(int(i) for i in __version__.split(".") if i.isdigit())
_VERBOSITY_TO_LOG_LEVEL = {
# output more than warnings but not debugging info
1: logging.INFO, # INFO is a numerical level of 20
# output debugging information
2: logging.DEBUG, # DEBUG is a numerical level of 10
}
LOG_FORMAT = (
"%(name)-25s %(processName)-11s %(relativeCreated)6d "
"%(levelname)-8s %(message)s"
)
def configure_logging(
verbosity: int,
filename: Optional[str] = None,
logformat: str = LOG_FORMAT,
) -> None:
"""Configure logging for flake8.
:param verbosity:
How verbose to be in logging information.
:param filename:
Name of the file to append log information to.
If ``None`` this will log to ``sys.stderr``.
If the name is "stdout" or "stderr" this will log to the appropriate
stream.
"""
if verbosity <= 0:
return
verbosity = min(verbosity, max(_VERBOSITY_TO_LOG_LEVEL))
log_level = _VERBOSITY_TO_LOG_LEVEL[verbosity]
if not filename or filename in ("stderr", "stdout"):
fileobj = getattr(sys, filename or "stderr")
handler_cls: Type[logging.Handler] = logging.StreamHandler
else:
fileobj = filename
handler_cls = logging.FileHandler
handler = handler_cls(fileobj)
handler.setFormatter(logging.Formatter(logformat))
LOG.addHandler(handler)
LOG.setLevel(log_level)
LOG.debug(
"Added a %s logging handler to logger root at %s", filename, __name__
)
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