Emacs - Elixir Setup Configuration Wiki

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The authors of this Wiki assume people want to use even more files (.dir-locals.el in this case) which I find to be a very strange assumption. Emacs and Spacemacs are complex enough already. We could use much more self-sufficient (single-file / single-function) examples and they’ll be far more useful.

Complete working example on disabling elixir-ls running Dialyzer, with context:

(defun dotspacemacs/user-config ()
  ;; Use LSP.
  (use-package lsp-mode
    :commands lsp
    :ensure t
    :diminish lsp-mode
    :hook
    (elixir-mode . lsp)
    :init
    (add-to-list 'exec-path "~/bin/elixir-ls/release")
    )

  ;; Set Elixir LSP hooks (in this case, format on save).
  (add-hook 'elixir-mode-hook
            (lambda ()
              (add-hook 'before-save-hook #'lsp-format-buffer nil t)))

  ;; Disable Dialyzer in `elixir-ls`.
  (defvar lsp-elixir--config-options (make-hash-table))
  (puthash "dialyzerEnabled" :json-false lsp-elixir--config-options)
  (add-hook 'lsp-after-initialize-hook
            (lambda ()
              (lsp--set-configuration `(:elixirLS, lsp-elixir--config-options))))

  ;; ...all your other user initialization code/config goes here...
)

This worked for me and Spacemacs stopped thrashing my server-grade workstation to a halt on literally every save. Spacemacs feels more snappy now.

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