A Python logging handler with ANSI coloring support

ansi.py

from pygments import highlight
from pygments.lexers import get_lexer_by_name, guess_lexer
from pygments.formatters import TerminalFormatter, Terminal256Formatter, NullFormatter

class PygmentsHandler(logging.StreamHandler):
    """Console logging handler with syntax highlighting"""

    def __init__(self, stream=None, syntax="guess", encoding='utf-8'):
        # run the regular Handler __init__
        logging.StreamHandler.__init__(self,stream)
        self.pformatter = (Terminal256Formatter(encoding=encoding)
             if '256color' in os.environ.get('TERM', '')
             else TerminalFormatter(encoding=encoding))
        if not stream.isatty():
            self.pformatter = NullFormatter
        if syntax == "guess":
            self.lexer = guess_lexer
        else:
            self.lexer = get_lexer_by_name(syntax)

    def emit(self, record):
        if self.pformatter == NullFormatter:
            return
        msg = self.format(record)
        # Note that the guessing also applies to any log formatting
        if self.lexer == guess_lexer:
            lexer = guess_lexer(msg)
            self.stream.write(highlight(msg,lexer,self.pformatter))
            return
        self.stream.write(highlight(msg,self.lexer,self.pformatter))