Are there any ways to do auto code completion?

[Duality142857]

like sth in scala shell, show possible completions?

[Quafadas]

I got this working in some form although it isn't perfect... YMMV. I'd welcome feedback if there was a better way.

TL;DR : Install metals server and leverage juypter LSP support...

Docs here;
https://jupyterlab-lsp.readthedocs.io/en/latest/Configuring.html

Docker snippets: cs = Coursier - great tool that is.

RUN /tmp/cs bootstrap almond:0.11.2 --scala 2.13.4 --no-default -i user -M almond.ScalaKernel --default=true --sources -o almond

RUN /tmp/cs bootstrap \
  --java-opt -XX:+UseG1GC \
  --java-opt -XX:+UseStringDeduplication  \
  --java-opt -Xss6m \
  --java-opt -Xms150m \
  org.scalameta:metals_2.12:0.10.5 -o metals -f

RUN chmod +x ./almond
RUN chmod +x ./metals
#COPY metals_lsp.json /opt/conda/etc/jupyter/jupyter_server_config.d/metals.json

# This should enable some logging which might make figuring out if it's working easier
#RUN touch ~/.cache/metals/lsp.trace.json # text editor
#RUN touch ~/.cache/metals/bsp.trace.json # build server
#RUN touch ~/.cache/metals/dap-server.trace.json # debug adapter
#RUN touch ~/.cache/metals/dap-client.trace.json # debug adapter

RUN ./almond --install --log info --metabrowse --variable-inspector --id scala2_13 --display-name "Scala 2.13" --global --jupyter-path /opt/conda/share/jupyter/kernels --extra-repository 

RUN rm -f almond

I have this in metals_lsp.json

{
    "LanguageServerManager": {
        "language_servers": {
            "metals": {
                "version": 2,
                "argv": ["/home/jovyan/metals"],
                "languages": ["scala"],
                "mime_types": ["text/x-scala"]
            }
        }
    }
}

And this in jupyter notebook config. I'm not sure which or both are needed in truth :-(...

c.LanguageServerManager.language_servers = {
    "scala": {
        # if installed as a binary
        "argv": ["/home/jovyan/metals"],
        "languages": ["scala"],
        "version": 2
    }
}

It took me some experimenting, but I did get there in the end. YMMV.