DWIM interface (was: Re: Select/highlight and *copy* matches of some regex)

[Emanuel Berg]

> Either use the region or consider that an interactive
> feature only and set 'beg' and 'end' to the default
> `point-min' and `point-max'?

Or `point' (not `point-min'), that's another thing to think
about ... but that maybe depends on the particular function,
or more so at least, what to do from Lisp with no supplied
boundaries _but_ a region, if you have a good answer to that
I think it would hold for all such functions ...

Here, compare ... ?

;;; -*- lexical-binding: t -*-
;;
;; this file:
;;   https://dataswamp.org/~incal/emacs-init/dwim.el

(defun test-dwim (&optional beg end)
  (interactive (when (use-region-p)
                 (list (region-beginning) (region-end)) ))
  (or beg (setq beg (point-min))) ; or (point)
  (or end (setq end (point-max)))
  ;; insert code here
  ;; now let's just make a list to do something
  (list beg end) )

(defun test-dwim-2 (&optional beg end)
  (interactive (when (use-region-p)
                 (list (region-beginning) (region-end)) ))
  (or beg (setq beg (if (use-region-p) (region-beginning) (point-min))))
  (or end (setq end (if (use-region-p) (region-end)       (point-max))))
  (list beg end) )

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