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#
# Copyright (C) 2010-2013 Vinay Sajip. All rights reserved.
#
import ctypes
import logging
import os
try:
unicode
except NameError:
unicode = None
class ColorizingStreamHandler(logging.StreamHandler):
"""
A stream handler which supports colorizing of console streams
under Windows, Linux and Mac OS X.
:param strm: The stream to colorize - typically ``sys.stdout``
or ``sys.stderr``.
"""
# color names to indices
color_map = {
'black': 0,
'red': 1,
'green': 2,
'yellow': 3,
'blue': 4,
'magenta': 5,
'cyan': 6,
'white': 7,
}
#levels to (background, foreground, bold/intense)
if os.name == 'nt':
level_map = {
logging.DEBUG: (None, 'blue', True),
logging.INFO: (None, 'white', False),
logging.WARNING: (None, 'yellow', True),
logging.ERROR: (None, 'red', True),
logging.CRITICAL: ('red', 'white', True),
}
else:
"Maps levels to colour/intensity settings."
level_map = {
logging.DEBUG: (None, 'blue', False),
logging.INFO: (None, 'black', False),
logging.WARNING: (None, 'yellow', False),
logging.ERROR: (None, 'red', False),
logging.CRITICAL: ('red', 'white', True),
}
csi = '\x1b['
reset = '\x1b[0m'
@property
def is_tty(self):
"Returns true if the handler's stream is a terminal."
isatty = getattr(self.stream, 'isatty', None)
return isatty and isatty()
def emit(self, record):
try:
message = self.format(record)
stream = self.stream
if unicode and isinstance(message, unicode):
enc = getattr(stream, 'encoding', 'utf-8')
message = message.encode(enc, 'replace')
if not self.is_tty:
stream.write(message)
else:
self.output_colorized(message)
stream.write(getattr(self, 'terminator', '\n'))
self.flush()
except (KeyboardInterrupt, SystemExit):
raise
except:
self.handleError(record)
if os.name != 'nt':
def output_colorized(self, message):
"""
Output a colorized message.
On Linux and Mac OS X, this method just writes the
already-colorized message to the stream, since on these
platforms console streams accept ANSI escape sequences
for colorization. On Windows, this handler implements a
subset of ANSI escape sequence handling by parsing the
message, extracting the sequences and making Win32 API
calls to colorize the output.
:param message: The message to colorize and output.
"""
self.stream.write(message)
else:
import re
ansi_esc = re.compile(r'\x1b\[((?:\d+)(?:;(?:\d+))*)m')
nt_color_map = {
0: 0x00, # black
1: 0x04, # red
2: 0x02, # green
3: 0x06, # yellow
4: 0x01, # blue
5: 0x05, # magenta
6: 0x03, # cyan
7: 0x07, # white
}
def output_colorized(self, message):
"""
Output a colorized message.
On Linux and Mac OS X, this method just writes the
already-colorized message to the stream, since on these
platforms console streams accept ANSI escape sequences
for colorization. On Windows, this handler implements a
subset of ANSI escape sequence handling by parsing the
message, extracting the sequences and making Win32 API
calls to colorize the output.
:param message: The message to colorize and output.
"""
parts = self.ansi_esc.split(message)
write = self.stream.write
h = None
fd = getattr(self.stream, 'fileno', None)
if fd is not None:
fd = fd()
if fd in (1, 2): # stdout or stderr
h = ctypes.windll.kernel32.GetStdHandle(-10 - fd)
while parts:
text = parts.pop(0)
if text:
write(text)
if parts:
params = parts.pop(0)
if h is not None:
params = [int(p) for p in params.split(';')]
color = 0
for p in params:
if 40 <= p <= 47:
color |= self.nt_color_map[p - 40] << 4
elif 30 <= p <= 37:
color |= self.nt_color_map[p - 30]
elif p == 1:
color |= 0x08 # foreground intensity on
elif p == 0: # reset to default color
color = 0x07
else:
pass # error condition ignored
ctypes.windll.kernel32.SetConsoleTextAttribute(h, color)
def colorize(self, message, record):
"""
Colorize a message for a logging event.
This implementation uses the ``level_map`` class attribute to
map the LogRecord's level to a colour/intensity setting, which is
then applied to the whole message.
:param message: The message to colorize.
:param record: The ``LogRecord`` for the message.
"""
if record.levelno in self.level_map:
bg, fg, bold = self.level_map[record.levelno]
params = []
if bg in self.color_map:
params.append(str(self.color_map[bg] + 40))
if fg in self.color_map:
params.append(str(self.color_map[fg] + 30))
if bold:
params.append('1')
if params:
message = ''.join((self.csi, ';'.join(params),
'm', message, self.reset))
return message
def format(self, record):
"""
Formats a record for output.
This implementation colorizes the message line, but leaves
any traceback unolorized.
"""
message = logging.StreamHandler.format(self, record)
if self.is_tty:
# Don't colorize any traceback
parts = message.split('\n', 1)
parts[0] = self.colorize(parts[0], record)
message = '\n'.join(parts)
return message
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