From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.org!not-for-mail
From: jj.retorre@gmail.com (Jean-Jacques =?utf-8?B?UsOpdG9ycsOp?=)
Newsgroups: gmane.emacs.help
Subject: Re: How to get the ~ functionality of vi
Date: Fri, 27 May 2016 06:28:23 +0200
Organization: Guest of ProXad - France
Message-ID: <87pos8p1js.fsf@elfie.nowhere.com>
References: <87shx44fbk.fsf@Equus.decebal.nl> <86h9dkfghn.fsf@student.uu.se>
NNTP-Posting-Host: plane.gmane.org
Mime-Version: 1.0
Content-Type: text/plain
X-Trace: ger.gmane.org 1464883700 20926 80.91.229.3 (2 Jun 2016 16:08:20 GMT)
X-Complaints-To: usenet@ger.gmane.org
NNTP-Posting-Date: Thu, 2 Jun 2016 16:08:20 +0000 (UTC)
To: help-gnu-emacs@gnu.org
Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Jun 02 18:08:20 2016
Return-path: <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Envelope-to: geh-help-gnu-emacs@m.gmane.org
Original-Received: from lists.gnu.org ([208.118.235.17])
	by plane.gmane.org with esmtp (Exim 4.69)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1b8VAR-0006kt-Rx
	for geh-help-gnu-emacs@m.gmane.org; Thu, 02 Jun 2016 18:08:20 +0200
Original-Received: from localhost ([::1]:48247 helo=lists.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1b8VAR-0002zE-4G
	for geh-help-gnu-emacs@m.gmane.org; Thu, 02 Jun 2016 12:08:19 -0400
Original-Path: usenet.stanford.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!feeder1-2.proxad.net!proxad.net!feeder1-1.proxad.net!cleanfeed3-b.proxad.net!nnrp5-1.free.fr!not-for-mail
Original-Newsgroups: gnu.emacs.help
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
Cancel-Lock: sha1:i6HFtCy+Oyi+4h2JyBVC6ChXwDg=
Original-Lines: 33
Original-NNTP-Posting-Date: 27 May 2016 06:28:23 CEST
Original-NNTP-Posting-Host: 37.163.140.23
Original-X-Trace: 1464323303 news-1.free.fr 7119 37.163.140.23:9244
Original-X-Complaints-To: abuse@proxad.net
Original-Xref: usenet.stanford.edu gnu.emacs.help:217894
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1.21
Precedence: list
List-Id: Users list for the GNU Emacs text editor <help-gnu-emacs.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/help-gnu-emacs/>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org
Original-Sender: "help-gnu-emacs"
	<help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Xref: news.gmane.org gmane.emacs.help:110241
Archived-At: <http://permalink.gmane.org/gmane.emacs.help/110241>

ven. 27 mai 2016,  Emanuel Berg <embe8573@student.uu.se> disait :

> Cecil Westerhof <Cecil@decebal.nl> writes:
>
>> In vi you can use ~ to flip the case of
>> a character. Does Emacs has something
>> like that?
>
> Try this:
>
>     (defun flip-case ()
>       (interactive)
>       (let ((c (string-to-char (thing-at-point 'char t))))
>         (delete-char 1)
>         (cond ((and (>= c ?A) (<= c ?Z)) (insert-char (downcase c)))
>               ((and (>= c ?a) (<= c ?z)) (insert-char (upcase   c)))
>               (t                         (insert-char c)))) )
>     (global-set-key "\C-cf" #'flip-case)

That won't work for accented chars.
Probably this should :

(defun flip-case ()
  (interactive)
  (let ((c (string-to-char (thing-at-point 'char t))))
    (delete-char 1)
    (insert-char
        (if (eq c (upcase c))
         (downcase c)
         (upcase c))) ) )

--
JJR.