Source code for conkit.command_line

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"""Command line facility for ConKit scripts"""

__author__ = "Felix Simkovic"
__date__ = "14 Apr 2017"
__version__ = "0.1"

import logging
import os
import sys


[docs]def setup_logging(level='info', logfile=None):
    """Set up logging to the console for the root logger.

    Parameters
    ----------
    level : str, optional
       The console logging level to be used [default: info]
       To change, use one of
           [ notset | info | debug | warning | error | critical ]
    logfile : str, optional
       The path to a full file log

    Returns
    -------
    logger
       Instance of a :obj:`logger <logging.Logger>`

    """

    class ColorFormatter(logging.Formatter):
        """Formatter to color console logging output"""

        # ANSI foreground color codes
        colors = {
            logging.DEBUG: 34,           # blue
            logging.WARNING: 33,         # yellow
            logging.ERROR: 31,           # red
            logging.CRITICAL: 31,        # red
        }

        def format(self, record):
            if record.levelno in self.colors:
                prefix = '\033[1;{}m'.format(
                    ColorFormatter.colors[record.levelno])
                postfix = '\033[0m'
                record.msg = os.linesep.join(
                    [prefix + l +
                        postfix for l in str(record.msg).splitlines()]
                )
            return logging.Formatter.format(self, record)

    # Reset any Handlers or Filters already in the logger to start from scratch
    # https://stackoverflow.com/a/16966965
    map(logging.getLogger().removeHandler, logging.getLogger().handlers[:])
    map(logging.getLogger().removeFilter, logging.getLogger().filters[:])

    logging_levels = {
        'notset': logging.NOTSET, 'info': logging.INFO, 'debug': logging.DEBUG,
        'warning': logging.WARNING, 'error': logging.ERROR, 'critical': logging.CRITICAL
    }

    # Create logger and default settings
    logging.getLogger().setLevel(logging.DEBUG)

    # create console handler with a higher log level
    ch = logging.StreamHandler(stream=sys.stdout)
    ch.setLevel(logging_levels.get(level, logging.INFO))
    ch.setFormatter(ColorFormatter('%(message)s'))
    logging.getLogger().addHandler(ch)

    # create file handler which logs even debug messages
    if logfile:
        fh = logging.FileHandler(logfile)
        fh.setLevel(logging.NOTSET)
        fh.setFormatter(
            logging.Formatter(
                '%(asctime)s\t%(name)s [%(lineno)d]\t%(levelname)s\t%(message)s')
        )
        logging.getLogger().addHandler(fh)

    logging.getLogger().debug('Console logger level: %s',
                              logging_levels.get(level, logging.INFO))
    logging.getLogger().debug('File logger level: %s', logging.NOTSET)

    return logging.getLogger()