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I would like to couple elm-format-on-save-mode and elm-preview-main, so that when I save a file it gets formatted and compiled, and the generated html get's previewed.

(use-package elm-mode
  :config
  (elm-format-on-save-mode 1)
  (defun format-preview ()
    (require elm-format-on-save-mode)
    (require elm-preview-main)
    (when (eval-expression elm-format-on-save)
      (eval-expression elm-preview-main)))
  (add-hook 'elm-format-on-save-mode 'format-preview))

As it is, elm-format-on-save-mode is not activated automatically when I enter an .elm file. And it's not coupled to elm-preview. How can I fix these problems?

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