GNU bug report logs - #71415
30.0.50; vtable-current-object off by one

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: john muhl <jm <at> pub.pink>
Subject: bug#71415: closed (Re: bug#71415: 30.0.50; vtable-current-object
 off by one)
Date: Sat, 15 Jun 2024 18:56:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#71415: 30.0.50; vtable-current-object off by one

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 71415 <at> debbugs.gnu.org.

-- 
71415: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=71415
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: john muhl <jm <at> pub.pink>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71415-done <at> debbugs.gnu.org
Subject: Re: bug#71415: 30.0.50; vtable-current-object off by one
Date: Sat, 15 Jun 2024 13:55:03 -0500

After looking at vtable.el I don’t think this is meant to work how
I expected.

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

>> From: john muhl <jm <at> pub.pink>
>> Date: Fri, 07 Jun 2024 09:15:07 -0500
>> 
>> After updating an object, ‘vtable-current-object’ in the displayer
>> and formatter functions points to the object after the one that
>> was updated. Running the following:
>> 
>>   (with-current-buffer (get-buffer-create "vtable-demo")
>>     (require 'vtable)
>>     (erase-buffer)
>>     (make-vtable
>>      :columns '("Index" "Number")
>>      :objects `((1 ,(random)) (2 ,(random)) (3 ,(random)))
>>      :displayer (lambda (value &rest _)
>>                   ;; vtable-current-object is off by one; e.g.
>>                   ;; update the first row and v-c-o will be the second row;
>>                   ;; update the final row and v-c-o will be nil.
>>                   (message "%s %s" value (vtable-current-object))
>>                   (propertize (number-to-string value) 'face 'vtable)))
>>     (let* ((table (vtable-current-table))
>>            (first (nth 0 (vtable-objects table)))
>>            (other (nth 1 (vtable-objects table)))
>>            (final (nth 2 (vtable-objects table))))
>>       (setf (nth 1 first) 1)
>>       (setf (nth 1 other) 2)
>>       (setf (nth 1 final) 3)
>>       (vtable-update-object table first)
>>       (vtable-update-object table other)
>>       (vtable-update-object table final)))
>> 
>> I see in the messages buffer:
>> 
>>   1 (2 2) [2 times]
>>   2 (3 3) [2 times]
>>   3 nil [2 times]
>> 
>> when I expect to see:
>> 
>>   1 (1 1) [2 times]
>>   2 (2 2) [2 times]
>>   3 (3 3) [2 times]
>
> Adam, any comments or suggestions?
>
> Thanks.

[Message part 3 (message/rfc822, inline)]

From: john muhl <jm <at> pub.pink>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; vtable-current-object off by one
Date: Fri, 07 Jun 2024 09:15:07 -0500

After updating an object, ‘vtable-current-object’ in the displayer
and formatter functions points to the object after the one that
was updated. Running the following:

  (with-current-buffer (get-buffer-create "vtable-demo")
    (require 'vtable)
    (erase-buffer)
    (make-vtable
     :columns '("Index" "Number")
     :objects `((1 ,(random)) (2 ,(random)) (3 ,(random)))
     :displayer (lambda (value &rest _)
                  ;; vtable-current-object is off by one; e.g.
                  ;; update the first row and v-c-o will be the second row;
                  ;; update the final row and v-c-o will be nil.
                  (message "%s %s" value (vtable-current-object))
                  (propertize (number-to-string value) 'face 'vtable)))
    (let* ((table (vtable-current-table))
           (first (nth 0 (vtable-objects table)))
           (other (nth 1 (vtable-objects table)))
           (final (nth 2 (vtable-objects table))))
      (setf (nth 1 first) 1)
      (setf (nth 1 other) 2)
      (setf (nth 1 final) 3)
      (vtable-update-object table first)
      (vtable-update-object table other)
      (vtable-update-object table final)))

I see in the messages buffer:

  1 (2 2) [2 times]
  2 (3 3) [2 times]
  3 nil [2 times]

when I expect to see:

  1 (1 1) [2 times]
  2 (2 2) [2 times]
  3 (3 3) [2 times]

In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.41, cairo version 1.18.0) of 2024-05-26 built on thelio
Repository revision: f2309557ff366a81183859bda88b9a0012a5d9d6
Repository branch: main
System Description: Fedora Linux 39 (Thirty Nine)

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