GNU bug report logs - #57459
Customisation before enabling display-fill-column-indicator-mode

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Package: emacs;

Reported by: wilnerthomas <at> tutanota.com

Date: Sun, 28 Aug 2022 13:14:02 UTC

Severity: normal

Tags: notabug

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#57459; Package emacs. (Sun, 28 Aug 2022 13:14:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to wilnerthomas <at> tutanota.com:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Sun, 28 Aug 2022 13:14:02 GMT) Full text and rfc822 format available.

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

From: wilnerthomas <at> tutanota.com
To: Bug Gnu Emacs <bug-gnu-emacs <at> gnu.org>
Subject: Customisation before enabling display-fill-column-indicator-mode
Date: Sun, 28 Aug 2022 15:13:27 +0200 (CEST)

Seems that face attributes can be set for fill-column-indicator before calling  
display-fill-column-indicator-mode.  But not for display-fill-column-indicator-character.

It would help if the customisation behaviour is made consistent such that one can 
customise the fill-column-indicator properties before enabling the mode.  With 
the customisation remaining effective when the mode is disabled.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#57459; Package emacs. (Sun, 28 Aug 2022 14:15:01 GMT) Full text and rfc822 format available.

Message #8 received at 57459 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: wilnerthomas <at> tutanota.com
Cc: 57459 <at> debbugs.gnu.org
Subject: Re: bug#57459: Customisation before enabling
 display-fill-column-indicator-mode
Date: Sun, 28 Aug 2022 17:14:33 +0300

> Date: Sun, 28 Aug 2022 15:13:27 +0200 (CEST)
> From: wilnerthomas--- via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> 
> Seems that face attributes can be set for fill-column-indicator before calling  
> display-fill-column-indicator-mode.  But not for display-fill-column-indicator-character.

Please show how you tried doing that, starting from "emacs -Q".  There
are many possible ways of customizing face attributes, and we need to
know which one you found not functioning in this case.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#57459; Package emacs. (Sun, 28 Aug 2022 14:40:01 GMT) Full text and rfc822 format available.

Message #11 received at 57459 <at> debbugs.gnu.org (full text, mbox):

From: wilnerthomas <at> tutanota.com
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 57459 <at> debbugs.gnu.org
Subject: Re: bug#57459: Customisation before enabling
 display-fill-column-indicator-mode
Date: Sun, 28 Aug 2022 16:38:55 +0200 (CEST)

Aug 28, 2022, 14:14 by eliz <at> gnu.org:

>> Date: Sun, 28 Aug 2022 15:13:27 +0200 (CEST)
>> From: wilnerthomas--- via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>>
>>
>> Seems that face attributes can be set for fill-column-indicator before calling  
>> display-fill-column-indicator-mode.  But not for display-fill-column-indicator-character.
>>
>
> Please show how you tried doing that, starting from "emacs -Q".  There
> are many possible ways of customizing face attributes, and we need to
> know which one you found not functioning in this case.
>
I made the following function

(defun indicator-attributes ()

     (setq display-fill-column-indicator-character ?\u2503)

     (set-face-attribute 'fill-column-indicator nil :background "green" :height 1.0))

I have another function to enable global-display-fill-column-indicator-mode

(defun  colum-indicator () 
     (interactive) (global-display-fill-column-indicator-mode))

If I call (indicator-attributes) in my init file, then do "M-x colum-indicator" in a buffer, I get the old character.

But if I change colum-indicator to include (indicator-attributes) after setting the global mode, I get
the correct wider character if I do "M-x colum-indicator" in a buffer.

(defun  colum-indicator ()
 
     (interactive) (global-display-fill-column-indicator-mode) (indicator-attributes))
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#57459; Package emacs. (Sun, 28 Aug 2022 15:02:01 GMT) Full text and rfc822 format available.

Message #14 received at 57459 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: wilnerthomas <at> tutanota.com
Cc: 57459 <at> debbugs.gnu.org
Subject: Re: bug#57459: Customisation before enabling
 display-fill-column-indicator-mode
Date: Sun, 28 Aug 2022 18:02:08 +0300

> Date: Sun, 28 Aug 2022 16:38:55 +0200 (CEST)
> From: wilnerthomas <at> tutanota.com
> Cc: 57459 <at> debbugs.gnu.org
> 
> Aug 28, 2022, 14:14 by eliz <at> gnu.org:
> 
> > Please show how you tried doing that, starting from "emacs -Q".  There
> > are many possible ways of customizing face attributes, and we need to
> > know which one you found not functioning in this case.
> >
> I made the following function
> 
> (defun indicator-attributes ()
> 
>      (setq display-fill-column-indicator-character ?\u2503)
> 
>      (set-face-attribute 'fill-column-indicator nil :background "green" :height 1.0))
> 
> I have another function to enable global-display-fill-column-indicator-mode
> 
> (defun  colum-indicator () 
>      (interactive) (global-display-fill-column-indicator-mode))
> 
> If I call (indicator-attributes) in my init file, then do "M-x colum-indicator" in a buffer, I get the old character.
> 
> But if I change colum-indicator to include (indicator-attributes) after setting the global mode, I get
> the correct wider character if I do "M-x colum-indicator" in a buffer.
> 
> (defun  colum-indicator ()
>  
>      (interactive) (global-display-fill-column-indicator-mode) (indicator-attributes))

It's the same issue as with fill-column:
display-fill-column-indicator-character is a variable that
automatically becomes buffer-local when set (see its doc string).  So
your setq is in effect only for a single buffer: the one in which
Emacs loads and evaluates the init file.

You should use setq-default instead.

This is not a bug.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#57459; Package emacs. (Sun, 28 Aug 2022 15:08:01 GMT) Full text and rfc822 format available.

Message #17 received at 57459 <at> debbugs.gnu.org (full text, mbox):

From: wilnerthomas <at> tutanota.com
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 57459 <at> debbugs.gnu.org
Subject: Re: bug#57459: Customisation before enabling
 display-fill-column-indicator-mode
Date: Sun, 28 Aug 2022 17:06:54 +0200 (CEST)

Aug 28, 2022, 15:02 by eliz <at> gnu.org:

>> Date: Sun, 28 Aug 2022 16:38:55 +0200 (CEST)
>> From: wilnerthomas <at> tutanota.com
>> Cc: 57459 <at> debbugs.gnu.org
>>
>> Aug 28, 2022, 14:14 by eliz <at> gnu.org:
>>
>> > Please show how you tried doing that, starting from "emacs -Q".  There
>> > are many possible ways of customizing face attributes, and we need to
>> > know which one you found not functioning in this case.
>> >
>> I made the following function
>>
>> (defun indicator-attributes ()
>>
>>      (setq display-fill-column-indicator-character ?\u2503)
>>
>>      (set-face-attribute 'fill-column-indicator nil :background "green" :height 1.0))
>>
>> I have another function to enable global-display-fill-column-indicator-mode
>>
>> (defun  colum-indicator () 
>>      (interactive) (global-display-fill-column-indicator-mode))
>>
>> If I call (indicator-attributes) in my init file, then do "M-x colum-indicator" in a buffer, I get the old character.
>>
>> But if I change colum-indicator to include (indicator-attributes) after setting the global mode, I get
>> the correct wider character if I do "M-x colum-indicator" in a buffer.
>>
>> (defun  colum-indicator ()
>>  
>>      (interactive) (global-display-fill-column-indicator-mode) (indicator-attributes))
>>
>
> It's the same issue as with fill-column:
> display-fill-column-indicator-character is a variable that
> automatically becomes buffer-local when set (see its doc string).  So
> your setq is in effect only for a single buffer: the one in which
> Emacs loads and evaluates the init file.
>
> You should use setq-default instead.
>
> This is not a bug.
>



Thusly I have the same problem because for setq-default,  the new value is seen in buffers that do not have their own values for the variable.

But I want to change the value even if buffer has its own value.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#57459; Package emacs. (Mon, 29 Aug 2022 15:25:02 GMT) Full text and rfc822 format available.

Message #20 received at 57459 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: wilnerthomas <at> tutanota.com, 57459 <at> debbugs.gnu.org
Subject: Re: bug#57459: Customisation before enabling
 display-fill-column-indicator-mode
Date: Mon, 29 Aug 2022 17:24:29 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> This is not a bug.

So I'm closing this bug report.
Added tag(s) notabug. Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Mon, 29 Aug 2022 15:25:03 GMT) Full text and rfc822 format available.
bug closed, send any further explanations to 57459 <at> debbugs.gnu.org and wilnerthomas <at> tutanota.com Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Mon, 29 Aug 2022 15:25:03 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. (Tue, 27 Sep 2022 11:24:05 GMT) Full text and rfc822 format available.
This bug report was last modified 1 year and 212 days ago.

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