Path mapping to support "Go to detention" inside Docker

[iJackUA]

Hi, this Extension and ElixirLS by itself looks very promising!

Previously I have started the same topic in VSCode-Elixir extension repo timmhirsens/vscode-elixir#59 (all details and my temporary solution is there).

Briefly:
Is it possible somehow to specify path mapping between container FS and Host FS? (I suppose it should be a Workspace settings per project like mapping "${workspaceRoot} => /www")
Because when you develop locally using Docker containers, so Erlang/Elixir by itself and the source code are placed INSIDE the container.
And module.module_info[:compile][:source] returns absolute path for container FS, but not for Host FS (that is expected by VSCode).
I suppose the same issue would arise not only for "go to definition" but for Debugger call stack source code display also.

I have a small repo with steps and expected / actual behavior https://github.com/iJackUA/vscode-elixir-docker-test

As I see this issue should be solved on both parts: VSCode extension should have path mapping param and pass it to Elixir server to do path normalization where module_info is done.

I understand that my request is not the main priority at such an early dev stage, but if you could just keep in mind this use case and eventually provide a solution for this - it would be awesome!

[JakeBecker]

This issue was moved to JakeBecker/elixir-ls#65