# debugio.py - output logging module
#
# Copyright (C) 1998, 1999 Albert Hopkins (marduk)
# Copyright (C) 2002 Mike W. Meyer
# Copyright (C) 2005 Arthur de Jong
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

"""Debugging and message output module.

This module contains facilities for logging program output.  The use of
this module is really simple: import it, set loglevel, and use debug(),
info(), warn() and error() whenever you want to print something."""

import sys

# log levels that can be used
ERROR=0
WARN=1
INFO=2
DEBUG=3

# initialize logging at default level
loglevel=INFO

def debug(msg):
    """Log the message to stderr if loglevel will allow it."""
    if loglevel>=DEBUG:
        print >>sys.stderr,"webcheck: DEBUG: "+str(msg)

def info(msg):
    """Log the message to stdout if loglevel will allow it."""
    if loglevel>=INFO:
        print >>sys.stdout,"webcheck: "+str(msg)
        sys.stdout.flush()

def warn(msg):
    """Log a warning to stderr if loglevel will allow it."""
    if loglevel>=WARN:
        print >>sys.stderr,"webcheck: Warning: "+str(msg)

def error(msg):
    """Log an error to stderr if loglevel will allow it."""
    if loglevel>=ERROR:
        print >>sys.stderr,"webcheck: Error: "+str(msg)