x/tools/gopls: implement callHierarchy

[josh-tepper-clarifai]

I'd love to see gopls implement the new LSP Call Hierarchy feature. I'd look forward to using it in VSCode which already supports it.

This was discussed as a "Preview Feature" in the VSCode release notes from March:
https://code.visualstudio.com/updates/v1_33#_preview-features

At the time, this LSP API was still in preview, but with the upcoming 3.16 LSP specification, I believe that this is no longer the case:
https://microsoft.github.io/language-server-protocol/specifications/specification-3-16/

As you can see from the screenshot included in the VSCode release notes, VSCode provides a nice ui when the language server implements this:

I see that others have requested this feature on the vscode-go repo, but I don't see a ticket here:
microsoft/vscode-go#2682

I share the sentiment of the other user: this would be a great addition and would be very useful for me in my day to day work.

[josh-tepper-clarifai]

I wanted to follow up on this ticket. I think that this type of interface would be a big asset when trying to quickly understand a piece of code

[stamblerre]

Agreed! We intend to support all LSP features in the future, but this isn't as high priority as some other bug fixes / features that we're currently working on.

[josh-tepper-clarifai]

Got it. Sounds good

[dandua98]

Closed by commit b793a13