Add support for the official Go language server, gopls (formerly golsp)

[gbrlsnchs]

Name: gopls (formerly golsp)
URL: https://godoc.org/golang.org/x/tools/cmd/gopls and https://github.com/golang/go/wiki/gopls

The server is minimally functional by now and is the official language server. It seems to work simply by running gopls serve.

[arp242]

Note that it is not recommended to use golsp at this point, as it's a very new project under active development. Adding support to ALE before it's stable would probably not be a good idea.

[w0rp]

It can be a good idea, as it will get people to start trying it, and finding bugs.

[tmc]

note that the official language server has been renamed to "gopls"

[diegs]

FWIW if you want to test it out, enabling the bingo linter and setting the following appears to work:

let g:ale_go_bingo_executable = 'gopls'

I'm getting completion, go to def, etc. and it is working really well (just installed the latest gopls). Initial feeling is that it's possibly better/faster/more reliable than bingo or go-langserver already.

[w0rp]

I have added this now by just copying the bingo linter to a gopls linter with some find and replace. Give it a try.

[stupid-genius]

@w0rp Can you explain what you did? I don't understand what you mean.