file_logger

A logger backend of files.

Provides

configuration via file (TOML)
configuration via code
flexible log format
log filtering

DOES NOT provide

log lotation -- It should be independent from loggers and done by logrotate or lotating file writers.
binary log -- Its very different from text logger.
multiple output files -- KISS. It should be done by some sort of logger aggrigator.
plug-ins -- KISS. This is meant to be a leaf library.
configuration via environment variables -- Envs are too poor to configure file logger.

API Docs

here. Very incomplete