Yes, on lsp-mode.el there are specific major modes that will trigger specific lsps, I think it's customizable and later you could add your major mode there as default if you want

But I don't want LSP to trigger at all.

Hum, if doesn't know about that major mode it should not ask for anything, what exactly happens?

here you can see a lsp declares what major modes should be activated: https://github.com/emacs-lsp/lsp-mode/blob/master/clients/lsp-clojure.el#L439

And https://github.com/emacs-lsp/lsp-mode/blob/master/lsp-mode.el#L730 is the variable that you could customize it, maybe your file extension is matching some of those?

That's what I'd have assumed - that it would ignore modes it doesn't know about. Instead it says "Unable to calculate the languageId" and "The language you are trying to use may not have built-in support for LSP".

I suspect it's occurring because I'm deriving my mode from clojure-mode.

Maybe something is triggering the minor-mode lsp?

Oh, maybe

Hum, I didn't know derived modes would trigger lsp-mode

But there's nothing in clojure-mode.el that would suggest it's linked to LSP directly...

Makes sense though, as in the end is a clojure-mode too

I guess there must be something tied to LSP that the mode inherits, but I'm not sure where to begin looking for it.

Looks like other people have had similar problems. It appears to be an issue with LSP not handling derived modes well.

I guess LSP mode is activated via a hook, and derived major modes inherit hooks. I could no inherit from Clojure-mode and just copy the parts I need, I guess.

maybe you could try to include your major-mode to lsp-disabled-clients

Yeah, though I don't want to tie it to LSP.

Yeah seems like a limitation indeed: https://github.com/emacs-lsp/lsp-mode/issues/3053#issuecomment-903655032

So maybe support LSP on your major mode, or add do the black list variable 😕

I'll ask on the LSP Discord server they have, see if they have any ideas. Otherwise I might try copying the pieces I need from clojure-mode.

I'm following your thread there, probably only yoncho will know, he will be available only in about 4-5 hours though

I'm in no hurry

I've been playing around with a superset of edn, and I wanted to make a major mode to handle syntax highlighting.

Sounds cool!

It's an excuse to learn more about emacs modes, syntax tables and font locking at least!

Haha Nice, I learned a lot about it when coding lsp-mode's semantic tokens