Expose _case.py methods

[geiseri]

I am abusing the plugin to generate some typescript that mirrors my generated python code. Unfortunately the protobuf generated code for the typescript has similar yet subtly different cases for type and field names. Being able to expose the case functionality to the py_ident and py_name would help out a lot.

There are quite a few creature comforts that this library offers it would be awesome to use for my other bindings instead of needing a different plugin.

[fischor]

HI, just to clarify: do you want to access the methods in _case.py or do you want to be able to pass a method as argument e.g. to protogen.Options that defines how py_name and py_ident are derived from the protobuf definitions?

[geiseri]

the helpers in _case.py would be handy, but the ability to manipulate the py_ident would be very handy in cases when you have imports like go. Even in its current state, it took me a bit, but I can do Go and typescript. I am going to do c++ next bit my need was the javascript equivalent of what I am doing in python.