distinguish between missing templates and schemes

[knezi]

When there's not template or scheme file, we get a general error saying not all resources present. Instead, it'd be nice if it reported what is missing. I suggest creating two children of LookupError and return a corresponding error. What do you think?
I'm ready to implement this.

[RealFerdinandDeSaussure]

Hello hello! Sorry for the late reply and thank you for the suggestion. We can definitely distinguish between those two error types, however I don't think it's necessary to subclass LookupError. Instead, I think it would be a good idea to clean up the error printing code so that error messages are just passed along together with the exception instance.

So instead of this

def something():
    raise LookupError

try:
    something()
except LookupError:
    print("specific error message")

we should do this:

def something():
    raise LookupError("specific error message")

try:
    something()
except LookupError as exc:
    print(exc.msg)

The err_print function should be adapted to this end as well. Would you be interested in implementing this as well? If it's a bit too far removed from what you had in mind, I'd gladly do it myself (might take a bit though).

[knezi]

Yes, this is a much better solution. I'll implement it. It just might take a while. I'll get back to you once I have something.