Using called-interactively-p

[uzibalqa]

I have the following function that executes the command (do-this) when
the function skatpad is called interactively by the user, but executes 
(do-that) if the function is called from elisp code.

The documentation suggests to use "called-interactively-p" instead of
(interactive-p).

Looking at the documentation, it is not quite clear whether KIND should be
a symbol or a string.  This problem of distinguishing between a symbol and
a string, is something that occurs frequently in the documentation.  A source
of constant deliberation for me.

(defun skatpad (opord &rest args)
  (interactive)

  (if (interactive-p)
      (do-this)
    (do-that)))