GNU bug report logs - #11226
format-mode-line, %z, mode-line-mule-info, and unibyte

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Package: emacs;

Reported by: Glenn Morris <rgm <at> gnu.org>

Date: Wed, 11 Apr 2012 19:18:01 UTC

Severity: minor

Found in version 24.0.95

Done: Chong Yidong <cyd <at> gnu.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#11226; Package emacs. (Wed, 11 Apr 2012 19:18:01 GMT) Full text and rfc822 format available.

Message #3 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: submit <at> debbugs.gnu.org
Subject: format-mode-line, %z, mode-line-mule-info, and unibyte
Date: Wed, 11 Apr 2012 15:16:34 -0400

Package: emacs
Version: 24.0.95

mode-line-mule-info contains this:

(propertize
 "%z" 'help-echo [...]
 (format "Buffer coding system %s\nmouse-1: describe coding system"
  (if enable-multibyte-characters
       (concat "(multi-byte): "
                    (symbol-name buffer-file-coding-system))
                       (concat "(unibyte): "
                                  (symbol-name buffer-file-coding-system))))

The intent is obviously that you see (multibyte) in the mode-line
tooltip in a multibyte buffer, and (unibyte) otherwise.

However, you will never see the unibyte tooltip, because:

(set-buffer-multibyte nil)
(format-mode-line "%z")
    -> ""

ie, the empty string, so there is nowhere for the help-echo to display.
Compare with "-" in multibyte buffers.

If it returned " " instead of "", you would see the tooltip.
bug closed, send any further explanations to 11226 <at> debbugs.gnu.org and Glenn Morris <rgm <at> gnu.org> Request was from Chong Yidong <cyd <at> gnu.org> to control <at> debbugs.gnu.org. (Sun, 03 Jun 2012 10:27:01 GMT) Full text and rfc822 format available.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#11226; Package emacs. (Sun, 03 Jun 2012 10:28:02 GMT) Full text and rfc822 format available.

Message #8 received at 11226 <at> debbugs.gnu.org (full text, mbox):

From: Chong Yidong <cyd <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 11226 <at> debbugs.gnu.org
Subject: Re: bug#11226: format-mode-line, %z, mode-line-mule-info, and unibyte
Date: Sun, 03 Jun 2012 18:24:39 +0800

Glenn Morris <rgm <at> gnu.org> writes:

> The intent is obviously that you see (multibyte) in the mode-line
> tooltip in a multibyte buffer, and (unibyte) otherwise.
>
> However, you will never see the unibyte tooltip, because:
>
> (set-buffer-multibyte nil)
> (format-mode-line "%z")
>     -> ""
>
> If it returned " " instead of "", you would see the tooltip.

Sounds reasonable; fixed in trunk.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Sun, 01 Jul 2012 11:24:03 GMT) Full text and rfc822 format available.
This bug report was last modified 12 years and 140 days ago.

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