Accessing/suggesting completion and doc for functions 'called' via namespace and the namespace access operators (double/triple colon)

[maxecharel]

Hi,

TL;DR

When packages are declared to be attached via library, languageserver suggests their functions as completions and gives access to their documentation. However, when a function is accessed via namespace + access operator (e.g. typing purrr::wal for purrr::walk) without a library declaration, it does not work.
Is there something I miss, or do you think you could implement such functionality?

Extended description

I mainly use R via Emacs (ess-r-mode, from the pkg Emacs Speaks Statistics, and r-ts-mode, from ESR pkg). ESS, in the same vein I think as RStudio, provides a completion system that allows to have e.g. purrr::walk suggested when typing purrr::wal, and gives access to its documentation. The drawback is that this completion system requires to have an associated R process running.

On the other hand, r-ts-mode leverages tree-sitter and, coupled with e.g. Eglot (Emacs-native LSP client), provides a pretty interesting IDE solution. However, the LSP features it gives access to is determined by languageserver, and since typing e.g. purrr::wal does not suggest purrr::walk , I guess the functionality is missing from languageserver itself.

While it is possible that there is something I am missing in my current Eglot + languageserver config, I am rather confident that the 'issue' comes from languageserver. Do you think implementing the previously described functionality would be feasible?

Finally, many thanks for your work with languageserver.

Edit: languageserver 0.3.18 and R 4.6.0