Common: Add colorized log formatter

New log formatter that color the output depending on the log
level of the message. The default palette handles: INFO,
SUCCESS, ERROR, DEBUG and CRITICAL.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/apps.py

@@ -193,6 +193,7 @@ class CommonApp(MayanAppConfig):
                 'disable_existing_loggers': False,
                 'formatters': {
                     'intermediate': {
+                        '()': 'mayan.apps.common.log.ColorFormatter',
                         'format': '%(name)s <%(process)d> [%(levelname)s] "%(funcName)s() line %(lineno)d %(message)s"',
                     },
                     'logfile': {

mayan/apps/common/log.py

@@ -0,0 +1,22 @@
+from __future__ import unicode_literals
+
+import logging
+
+from django.utils.termcolors import colorize
+
+PALETTE = {
+    'CRITICAL': {'fg': 'red', 'opts': ('bold', 'blink', 'reverse')},
+    'DEBUG': {'fg': 'cyan'},
+    'ERROR': {'fg': 'red', 'opts': ('bold',)},
+    'INFO': {'fg': 'white'},
+    'SUCCESS': {'fg': 'green'},
+    'WARNING': {'fg': 'yellow', 'opts': ('bold', 'underscore')},
+}
+
+
+class ColorFormatter(logging.Formatter):
+    def format(self, record):
+        record.msg = colorize(
+            text=record.msg, **PALETTE.get(record.levelname, {})
+        )
+        return super(ColorFormatter, self).format(record)