Lib/distutils/log.py

   1 """A simple log mechanism styled after PEP 282."""
   2
   3 # This module should be kept compatible with Python 2.1.
   4
   5 # The class here is styled after PEP 282 so that it could later be
   6 # replaced with a standard Python logging implementation.
   7
   8 DEBUG = 1
   9 INFO = 2
  10 WARN = 3
  11 ERROR = 4
  12 FATAL = 5
  13
  14 import sys
  15
  16 class Log:
  17
  18     def __init__(self, threshold=WARN):
  19         self.threshold = threshold
  20
  21     def _log(self, level, msg, args):
  22         if level >= self.threshold:
  23             if not args:
  24                 # msg may contain a '%'. If args is empty,
  25                 # don't even try to string-format
  26                 print msg
  27             else:
  28                 print msg % args
  29             sys.stdout.flush()
  30
  31     def log(self, level, msg, *args):
  32         self._log(level, msg, args)
  33
  34     def debug(self, msg, *args):
  35         self._log(DEBUG, msg, args)
  36
  37     def info(self, msg, *args):
  38         self._log(INFO, msg, args)
  39
  40     def warn(self, msg, *args):
  41         self._log(WARN, msg, args)
  42
  43     def error(self, msg, *args):
  44         self._log(ERROR, msg, args)
  45
  46     def fatal(self, msg, *args):
  47         self._log(FATAL, msg, args)
  48
  49 _global_log = Log()
  50 log = _global_log.log
  51 debug = _global_log.debug
  52 info = _global_log.info
  53 warn = _global_log.warn
  54 error = _global_log.error
  55 fatal = _global_log.fatal
  56
  57 def set_threshold(level):
  58     # return the old threshold for use from tests
  59     old = _global_log.threshold
  60     _global_log.threshold = level
  61     return old
  62
  63 def set_verbosity(v):
  64     if v <= 0:
  65         set_threshold(WARN)
  66     elif v == 1:
  67         set_threshold(INFO)
  68     elif v >= 2:
  69         set_threshold(DEBUG)