Re: (interactive "r") and (use-region-p)

[Andreas Röhler]

On 16.03.2017 19:31, Ingo Lohmar wrote:

On Thu, Mar 16 2017 13:20 (-0400), Sam Steingold wrote:

--8<---------------cut here---------------start------------->8---
(defun my-command (beg end)
  (interactive "r")
  (if (use-region-p)
      (my-command-region beg end)
    (my-command-non-region)))
--8<---------------cut here---------------end--------------->8---

Hi Sam,

AFAIK, you cannot use the (interactive "r") form for this "dwim-ish"
kind of behavior.

Why that? If a region is set, why should (use-region-p) fail?

The answer is: there are contradictions in implementation.
Which was discussed at time.

Thanks Sam for showing that.