Read logging format

[boompig]

This module should output in same format as specified by logging.basicConfig.

[htgoebel]

My approach would be:
Implement a new class ColoredFormatter(logging.Formatter) which does the following:

1. In __init__: Replace the formatting sting like %(name)s with an ansi-wraped version. Something like

if istty:
  for s, kw in (
          ('name', {color: 'green'}),
          ('pathname', ...)
          ('loggername', ...), ...):
     s = '%(' + s + ')s'
     fmt = fmt.replace(s, ansi_wrap(s, *kw)

Later this can be enhanced by using regepx to detect more formating instructions.

2. In format(): Instead of s = self._fmt % record.__dict__ use something like this:

is istty and '%(levelname)' in fmt:
  data = record.__dict__.copy()
  data['levelname'] =  ansi_warptext(data['levelname'], **self.severity_to_style[data['levelname'])
  ... same for levelno
else:
    data = record.__dict__.copy()

This allows to specify the logformat as usual. User of your module only need to plug-in the ColoredFormatter. This should be easy, see e.g. https://docs.python.org/2/library/logging.config.html#dictionary-schema-details.

NB: You could do something like this for your formatter writing HTML.

[xolox]

Hi @boompig and @htgoebel and thanks for the feedback. Please try out version 3.0 (just released). I've changed the ColoredStreamHandler into a ColoredFormatter that supports user defined format strings just like logging.Formatter does. I've also improved coloredlogs.install() so that the log format and date/time format can be set with coloredlogs.install(fmt=..., datefmt=...). Additionally there are now several environment variables that can be used to customize coloredlogs "from the outside" (refer to the online documentation for details and examples).