support for textDocument/diagnostic

[waymondo]

I'm not sure how common this is across other LSP servers, but ruby-lsp does not use textDocument/publishDiagnostics to publish diagnostics - it only uses that event to clear them out on document close.

Instead, their VSCode plugin relies on polling for diagnostics in an interval with textDocument/diagnostic. a quick look through the Eglot source and I don't see evidence of a similar mechanism. is this correct? in the ruby-lsp wiki it seems like the Neovim LSP client also doesn't support this and so there is some additional code someone has created for this purpose.

if this currently isn't a feature of Eglot, would it make sense to entertain as a new feature? are there any other known LSP servers that rely on polling for diagnostics like this?

[joaotavora]

. is this correct?

Yes. This is called "pull diagnostics" or something.

if this currently isn't a feature of Eglot, would it make sense to entertain as a new feature?

Yes, it would. In fact, this should be closer to Emacs's model of getting diagnostics for other languages. However this is an very tricky part of Eglot and I would like to not break it or over-complexify it. So a carefully tested and well-designed implementation must be done.

Please send email to bug-gnu-emacs@gnu.org to open a bug report with this feature request, include these messages as context, and remember to CC me. Thanks.

[waymondo]

thanks! will do. what's your email address for CC-ing?

[joaotavora]

Find it in the Eglot source