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Re: Region argument

From: Juri Linkov
Subject: Re: Region argument
Date: Wed, 04 Jan 2017 02:57:08 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (x86_64-pc-linux-gnu)

>> We could start by having Someoneā„¢ "in the know" (hint, hint) describe
>> the new conventions in the ELisp manual.
> I remember we discussed a new convention, but I'm not sure if we did end
> up implementing one.

IIRC, the missing piece is just a small function:

  (defun region ()
    (funcall region-extract-function 'bounds))

to provide all info including former region-beginning and region-end
for ordinary regions as well as a list of boundaries in case of
rectangular regions.  Then it could be used in the interactive spec:

  (defun occur (regexp &optional nlines region)
     (nconc (occur-read-primary-args)
            (list (and (use-region-p) (region)))))
    (occur-1 regexp nlines (list (current-buffer))))

Here nconc for occur-read-primary-args complicates the issue a little,
but in the general case what is needed is only

  (interactive (list (and (use-region-p) (region))))

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