I already knew about the color escapes, I used them in my bash prompt a while ago. Thanks anyway.
What I wanted was to integrate it with the logging module, which I eventually did after a couple of tries and errors.
Here is what I end up with:
BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8)
#The background is set with 40 plus the number of the color, and the foreground with 30
#These are the sequences need to get colored ouput
RESET_SEQ = "\033[0m"
COLOR_SEQ = "\033[1;%dm"
BOLD_SEQ = "\033[1m"
def formatter_message(message, use_color = True):
if use_color:
message = message.replace("$RESET", RESET_SEQ).replace("$BOLD", BOLD_SEQ)
else:
message = message.replace("$RESET", "").replace("$BOLD", "")
return message
COLORS = {
'WARNING': YELLOW,
'INFO': WHITE,
'DEBUG': BLUE,
'CRITICAL': YELLOW,
'ERROR': RED
}
class ColoredFormatter(logging.Formatter):
def __init__(self, msg, use_color = True):
logging.Formatter.__init__(self, msg)
self.use_color = use_color
def format(self, record):
levelname = record.levelname
if self.use_color and levelname in COLORS:
levelname_color = COLOR_SEQ % (30 + COLORS[levelname]) + levelname + RESET_SEQ
record.levelname = levelname_color
return logging.Formatter.format(self, record)
And to use it, create your own Logger:
# Custom logger class with multiple destinations
class ColoredLogger(logging.Logger):
FORMAT = "[$BOLD%(name)-20s$RESET][%(levelname)-18s] %(message)s ($BOLD%(filename)s$RESET:%(lineno)d)"
COLOR_FORMAT = formatter_message(FORMAT, True)
def __init__(self, name):
logging.Logger.__init__(self, name, logging.DEBUG)
color_formatter = ColoredFormatter(self.COLOR_FORMAT)
console = logging.StreamHandler()
console.setFormatter(color_formatter)
self.addHandler(console)
return
logging.setLoggerClass(ColoredLogger)
Just in case anyone else needs it.
Be careful if you're using more than one logger or handler: ColoredFormatter
is changing the record object, which is passed further to other handlers or propagated to other loggers. If you have configured file loggers etc. you probably don't want to have the colors in the log files. To avoid that, it's probably best to simply create a copy of record
with copy.copy()
before manipulating the levelname attribute, or to reset the levelname to the previous value, before returning the formatted string (credit to Michael in the comments).
logger.exception
will output a stack trace alongside the error message.
For example:
import logging
try:
1/0
except ZeroDivisionError:
logging.exception("message")
Output:
ERROR:root:message
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ZeroDivisionError: integer division or modulo by zero
@Paulo Cheque notes, "be aware that in Python 3 you must call the logging.exception
method just inside the except
part. If you call this method in an arbitrary place you may get a bizarre exception. The docs alert about that."
Best Answer
You can create base karma config. Than create two karma config based on base but with overwritten logLevel:
logLevel: config.LOG_DISABLE
logLevel: config.LOG_DEBUG
.Then create two separate tasks in your task manager config file, for instance
Gruntfile.js
using those karma configs.