Run `html-beautify on html file opened in Emacs buffer when saving it

html-beautify-auto.el

  (defun beautify-html-file-and-revert ()
    "Beautify file with html-beautify and only if major mode is web-mode"
    (interactive)
    (when (eq major-mode 'web-mode)
      (message "html-beautify taking care of your markup" (buffer-file-name))
      (shell-command (concat "html-beautify --quiet --replace -s 2 -I -E \"\" --max-preserve-newlines 0 -f " (buffer-file-name)))
      (revert-buffer t t)))

(add-hook 'after-save-hook #'beautify-html-file-and-revert)