trouble passing setting to typst-lsp

[Zjl37]

Hello. I'm configuring my Emacs to use nvarner/typst-lsp, an LSP for a (relatively new) markup typesetting language Typst. and I wish to disable the lsp's "compile on save" feature, that is, whenever I save a *.typ file, I do not want typst-lsp to compile it into a PDF document with the same name in that same directory. According to this, I need to change the setting exportPdf to never. However I can't find a way to make this setting work in Emacs after hours of attempt. below is what I did:

Since Typst is not a supported language by lsp-mode, nor did typst-lsp mention in its readme the install steps for Emacs, I referred to Adding support for languages page, and come up with the following setup:

(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")
                  :server-id 'typst-lsp))

(add-hook 'typst-ts-mode-hook 'lsp-deferred)

(in which typst-ts-mode is already properly configured)

And, If i understood the document correct, I need to use lsp-defcustom. Feeding the package.json file from inside the vsix VScode extension file into lsp-generate-settings, with the second argument being 'lsp-typst-lsp, I got this elisp code:

(lsp-defcustom lsp-typst-lsp-export-pdf "onSave"
  "The extension can export PDFs of your Typst files. This setting controls whether this feature is enabled and how often it runs."
  :type '(choice (:tag never onSave onPinnedMainSave onType onPinnedMainType))
  :group 'lsp-typst-lsp
  :package-version '(lsp-mode . "8.0.1")
  :lsp-path "typst-lsp.exportPdf")

among other five similar lsp-defcustom expressions. I appended them to my emacs init file, then added (setq lsp-typst-lsp-export-pdf "never").

The LSP did work -- completions, error checks, ... all works with my exisiting configuration. But the exportPdf = never setting is not in effect. I still see pdf generated after saving .typ files. In contrast in VS Code or VSCodium, using the extension also provided by nvarner/typst-lsp, I can easily find the setting in the GUI, choose "never", and see the desired effect.

What's even stranger, when I tried to M-x customize-variable RET lsp-typst-lsp-export-pdf, nothing appears in the eazy customization interface, under the three buttons. Meanwhile an error message appears: widget-choice-match: Symbol’s function definition is void: nil

Where am I doing wrong? Can someone tell me the right way to set these options?

Many thanks🙏🙏 in advance.

Extra information

Emacs version: GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, cairo version 1.17.8)

(vanilla, no doom or other configuration layer)

lsp-mode version: 20240116.1748, installed from melpa

typst-lsp --version: Version: 0.12.1, commit 1928d88ff8bc3e178ad098146bec252751383a48 (Typst version 0.10.0)

typst-ts-mode (I believe this is not relevant) is meow_king/typst-ts-mode on sourcehut, latest commit, setup as such:

(use-package typst-ts-mode
  :straight (:type git :host sourcehut :repo "meow_king/typst-ts-mode"))

typst --version: typst 0.10.0 (70ca0d25)

[Zjl37]

Just managed to get trace logs of communication between lsp server and clients, both in Emacs and VSCodium. Searched string exportPdf in Codium's log, it only appeared once in the first initialize request, in here:

while in Emacs's log the same place was just null

[yyoncho]

You have to do something like that: https://github.com/emacs-lsp/lsp-mode/blob/master/clients/lsp-volar.el#L120 (without the ht-merge part).

[Zjl37]

Thank you for pointing me out! It worked 👍 after I passed :initialization-options (ht ("exportPdf" "never")) to make-lsp-client, or passing :initialization-options (lambda () (gethash "typst-lsp" (lsp-configuration-section "typst-lsp")))

however it seems I couldn't find :initialization-options documented anywhere, which is a bit frustrating.

Still, the customization interface don't work for these lsp-defcustom-defined variables, and I wonder why. Though I can do setq, (setopt lsp-typst-lsp-export-pdf "never") would cause error with this backtrace:

Debugger entered--Lisp error: (void-function nil)
  nil((:tag :args (never onSave onPinnedMainSave onType onPinnedMainType)) "never")
  widget-choice-match((choice :args ((:tag :args (never onSave onPinnedMainSave onType onPinnedMainType)))) "never")
  setopt--set(lsp-typst-lsp-export-pdf "never")
  (progn (setopt--set 'lsp-typst-lsp-export-pdf "never"))
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  funcall-interactively(eval-last-sexp nil)
  command-execute(eval-last-sexp)

[DrLoiseau]

Thanks so much ! I had been trying to do that for weeks... I finally won't be getting all those empty pdfs for my packages .typ files.