Passing configuration variable for a registered server

[DrLoiseau]

Hi,

I'd like to be able to set a variable for typst-lsp (https://github.com/nvarner/typst-lsp). It runs fine with typst-ts-mode, following the instructions on this page : https://emacs-lsp.github.io/lsp-mode/page/adding-new-language/

There is an option in typst-lsp, on by default, to compile the source code to produce the pdf on file save. I would like to disable it. As it is explained on this post : nvarner/typst-lsp#158, I have to set exportPdf to "never" in the language server configuration. Some editors apparently provide ways to set it from the GUI (VSCode) or with a config file (helix).

How can I configure typst-lsp in emacs ? Ideally I would set it in my init file during the lsp initialization.

For information here is what I tried, using environment-fn. The lsp works fine but the exportPdf option has not been set. I think I didn't understand what environment-fn is used for.

(with-eval-after-load 'lsp-mode
(add-to-list 'lsp-language-id-configuration
'(typst-ts-mode . "typst"))

(lsp-register-client
(make-lsp-client :new-connection (lsp-stdio-connection "typst-lsp")
:activation-fn (lsp-activate-on "typst")
:environment-fn (lambda ()
'(("exportPdf" . "never")))
:server-id 'typst)))

Thanks in advance

[yyoncho]

Check this: https://emacs-lsp.github.io/lsp-mode/page/adding-new-language/#sections . Also some servers require sending the initialization options explicitly like this: https://github.com/emacs-lsp/lsp-mode/blob/master/clients/lsp-rust.el#L1734 or like this: https://github.com/emacs-lsp/lsp-mode/blob/master/clients/lsp-kotlin.el#L339