How to ignore/blocklist a regex or subtree of folders entirely in config file?

[real-or-random]

How can I configure a regexp (or a subtree in my file system) in which lsp-mode are ignored?

When I open a file in a workspace for the first time, I get a menu and I can press d or even D to select the folder. That's good so far, but where is this setting stored? I'd prefer to include a simple two-liner in my emacs config file to enhance the maintainability of my config.

The menu refers to lsp-session-folders-blocklist, but it's a function and not a variable. Well, okay, it's a getter, the docstring is:

Access slot "folders-blocklist" of lsp-session struct CL-X.

and then I see this:

(cl-defstruct lsp-session
[...]
  ;; contains the folders that must not be imported in the current workspace.
  folders-blocklist
[...] )


This sounds like something specific to a workspace already, and not something that works globally?

[yyoncho]

Something like that should work:

(with-eval-after-load 'lsp-mode
  (cl-pushnew "/foo" (lsp-session-folders-blocklist (lsp-session))
              :test 'string=))

you typically have one lsp session per emacs session.

[real-or-random]

Thanks a lot! That doesn't do the trick yet.

I suspect that it runs too early. I get this when I open the first file where lsp is supposed to run (whether it's in the blocklisted folder or not), and lsp-session-folders-blocklist wasn't updated:

Error (python-mode-local-vars-hook): Error running hook "lsp!" because: (void-function (setf lsp-session-folders-blocklist))

This may be a doom emacs thing, lsp! is a doom function that initializes lsp support by dispatching to lsp-mode or eglot. Any further ideas?