GNU bug report logs - #28183
Customize always reports error when trying to enter characters to Whitespace Mode display mappings

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Package: emacs;

Reported by: Andrew Toskin <andrew.toskin <at> gmail.com>

Date: Tue, 22 Aug 2017 04:56:01 UTC

Severity: normal

Tags: fixed, patch

Merged with 15925, 21771, 31869

Found in versions 24.3.50, 25.0.50, 27.0.50

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#28183; Package emacs. (Tue, 22 Aug 2017 04:56:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to Andrew Toskin <andrew.toskin <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Tue, 22 Aug 2017 04:56:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andrew Toskin <andrew.toskin <at> gmail.com>
To: GNU Emacs Bug Tracker <bug-gnu-emacs <at> gnu.org>
Subject: Customize always reports error when trying to enter characters to
 Whitespace Mode display mappings
Date: Mon, 21 Aug 2017 21:54:08 -0700
[Message part 1 (text/plain, inline)]
## The problem

Customize throws an error when trying to set characters in the Whitespace
Mode display mappings. When I paste the symbols I want into the Customize
fields, it says "This field should contain a single character." Even though
I've only deleted and entered a single character! There's a lot more
documentation about the syntax of setting the variable in code than through
the Customize interface, so I'm not sure if Customize is broken or if I'm
misunderstanding something. But when trying to edit more than one display
mapping, this error is at least vague and unhelpful.


## My system setup

* Fedora 26 Workstation x86_64
* Emacs 25.2.1 in an X window, with GTK+ 3.22.16
* Whitespace Mode 13.2.2 (packaged with Emacs, in Fedora)


## Steps to reproduce

1. Launch Emacs without any other configuration (`emacs --quick`).
2. Execute Customize and search for Whitespace Display Mappings.
3. Edit the character mapping. For example, delete the default "$" used for
newlines, and paste "↵" (U+21b5 "Downwards Arrow With Corner Leftward").
4. Click Apply. See the error in the mode line at the bottom of Emacs

I thought at first that Customize wasn't accepting Unicode characters that
might be more than a single byte, but I actually tried resetting all
mappings to default, then editing the newline mapping to replace the
default "$" with another ASCII character, "&", and it **still** says "This
field should contain a single character."

I ended up setting the display mapping manually from my config file.

  (setq whitespace-display-mappings '(
        ;; Plain space: · or .
        (space-mark   32  [183]     [46]            )
        ;; Non-breaking "hard" space: • or _
        (space-mark   160 [8226]    [95]            )
        ;; Newline: ↵ or ¬ or $
        (newline-mark 10  [8629 10] [172 10] [36 10])
        ;; Tab: ⇥ or » or \
        (tab-mark     9   [8677 9]  [187 9]  [92 9] )))

**This** works as expected.

But I can't figure out why I couldn't do this in Customize. What do you
think?

Thank,
~ Andrew
[Message part 2 (text/html, inline)]

Merged 15925 28183. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> debbugs.gnu.org. (Tue, 22 Aug 2017 19:27:03 GMT) Full text and rfc822 format available.

Merged 15925 21771 28183. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> debbugs.gnu.org. (Tue, 22 Aug 2017 19:33:03 GMT) Full text and rfc822 format available.

Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#28183; Package emacs. (Wed, 30 Aug 2017 03:13:02 GMT) Full text and rfc822 format available.

Message #12 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Andrew Toskin <andrew.toskin <at> gmail.com>
To: GNU Emacs Bug Tracker <bug-gnu-emacs <at> gnu.org>
Subject: Re: Customize always reports error when trying to enter characters to
 Whitespace Mode display mappings
Date: Tue, 29 Aug 2017 20:11:31 -0700
[Message part 1 (text/plain, inline)]
Bump.

Any ideas?


On Mon, Aug 21, 2017 at 9:54 PM, Andrew Toskin <andrew.toskin <at> gmail.com>
wrote:

> ## The problem
>
> Customize throws an error when trying to set characters in the Whitespace
> Mode display mappings. When I paste the symbols I want into the Customize
> fields, it says "This field should contain a single character." Even
> though I've only deleted and entered a single character! There's a lot more
> documentation about the syntax of setting the variable in code than through
> the Customize interface, so I'm not sure if Customize is broken or if I'm
> misunderstanding something. But when trying to edit more than one display
> mapping, this error is at least vague and unhelpful.
>
>
> ## My system setup
>
> * Fedora 26 Workstation x86_64
> * Emacs 25.2.1 in an X window, with GTK+ 3.22.16
> * Whitespace Mode 13.2.2 (packaged with Emacs, in Fedora)
>
>
> ## Steps to reproduce
>
> 1. Launch Emacs without any other configuration (`emacs --quick`).
> 2. Execute Customize and search for Whitespace Display Mappings.
> 3. Edit the character mapping. For example, delete the default "$" used
> for newlines, and paste "↵" (U+21b5 "Downwards Arrow With Corner Leftward").
> 4. Click Apply. See the error in the mode line at the bottom of Emacs
>
> I thought at first that Customize wasn't accepting Unicode characters that
> might be more than a single byte, but I actually tried resetting all
> mappings to default, then editing the newline mapping to replace the
> default "$" with another ASCII character, "&", and it **still** says "This
> field should contain a single character."
>
> I ended up setting the display mapping manually from my config file.
>
>   (setq whitespace-display-mappings '(
>         ;; Plain space: · or .
>         (space-mark   32  [183]     [46]            )
>         ;; Non-breaking "hard" space: • or _
>         (space-mark   160 [8226]    [95]            )
>         ;; Newline: ↵ or ¬ or $
>         (newline-mark 10  [8629 10] [172 10] [36 10])
>         ;; Tab: ⇥ or » or \
>         (tab-mark     9   [8677 9]  [187 9]  [92 9] )))
>
> **This** works as expected.
>
> But I can't figure out why I couldn't do this in Customize. What do you
> think?
>
> Thank,
> ~ Andrew
>
[Message part 2 (text/html, inline)]

Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#28183; Package emacs. (Wed, 30 Aug 2017 03:22:02 GMT) Full text and rfc822 format available.

Message #15 received at 28183 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Andrew Toskin <andrew.toskin <at> gmail.com>
Cc: 28183 <at> debbugs.gnu.org
Subject: Re: bug#28183: Customize always reports error when trying to enter
 characters to Whitespace Mode display mappings
Date: Tue, 29 Aug 2017 23:22:55 -0400
Andrew Toskin <andrew.toskin <at> gmail.com> writes:

> Bump.
>
> Any ideas?

There seems to be a suggestion for a fix in
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=15925#11.




Merged 15925 21771 28183 31869. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> debbugs.gnu.org. (Sun, 17 Jun 2018 16:21:01 GMT) Full text and rfc822 format available.

Added tag(s) patch. Request was from Mauro Aranda <maurooaranda <at> gmail.com> to control <at> debbugs.gnu.org. (Tue, 22 Sep 2020 15:44:02 GMT) Full text and rfc822 format available.

Added tag(s) fixed. Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Sat, 26 Sep 2020 15:11:02 GMT) Full text and rfc822 format available.

bug marked as fixed in version 28.1, send any further explanations to 15925 <at> debbugs.gnu.org and Claudio Bley <claudio.bley <at> googlemail.com> Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Sat, 26 Sep 2020 15:11:02 GMT) Full text and rfc822 format available.

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Sun, 25 Oct 2020 11:24:06 GMT) Full text and rfc822 format available.

This bug report was last modified 3 years and 155 days ago.

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