[bornfreddy]

No, the levels are not useless, far from it. Even if you just print to stdout, prefixing each line with a (maybe colored?) level info is very useful. Also, if later you decide to use xyz format, it is trivial to implement this. Changing all logging calls? Not so much.

[bombolo]

Just use a real logging daemon and it will be the colours by itself.

It will also let you query for which level you want.

> Changing all logging calls? Not so much.

Uh? Make a good library using the same interface.