Alternative to gogetdoc for :GoDoc

[mgartner]

I'm curious if there are any plans for replacing gogetdoc for the :GoDoc command.

Currently, gogetdoc doesn't work well for large projects (and possible projects with cgo). It uses 100% CPU and hangs for minutes or longer. I think this issue is related to microsoft/vscode-go#1907, zmb3/gogetdoc#47, golang/go#29427.

Could gopls be used to provide documentation? Are there any other options?

I was working on a PR to add an option to use go doc only, but couldn't think of a consistent way to get the correct package name, so it'd be a lot less accurate than gogetdoc.

[bhcleek]

Could gopls be used to provide documentation?

gopls does have some capability to provide documentation, and vim-go does already uses that for hover balloons. It could be extended to also work for :GoDoc.

I don't currently have any PRs in progress for that; feel free to submit a PR.

Are there any other options?

go doc is an option, and vim-go already uses that in some cases. With the help of gopls it might be possible to get enough information about the position under the cursor to leverage go doc for :GoDoc without any arguments.

[bhcleek]

@mgartner feel free to give #2822 a try