;; https://github.com/lassik/emacs-format-all-the-code
(use-package format-all)

(use-package org
  :config
  (defun my/format-all-advice ()
    (ignore-errors               ; in case there's no language support
      (call-interactively #'format-all-buffer)))

  (advice-add #'org-edit-src-exit :before #'my/format-all-advice))