+ The format of \"color_spec\" is [fg [bg]] [attr].
+
+ Valid colors for \"fg\" and \"bg\" are \"normal\", \"black\",
+ \"red\", \"green\", \"yellow\", \"blue\", \"magenta\",
+ \"cyan\", and \"white\".
+
+ The \"attr\" value must be one of \"bold\", \"dim\", \"ul\",
+ \"blink\", \"reverse\".
+
+ Examples:
+
+ --log_color \"debug:green\"
+ --log_color \"info:yellow bold\"
+ --log_color \"notice:white red bold\"