Re: Deleting mail in virtual group

[Alexander Baier <alexander.baier@mailbox.org>]

On 2014-10-05 10:36 Eric Abrahamsen wrote:
> Alexander Baier <alexander.baier@mailbox.org> writes:
>
>> On 2014-10-04 14:48 Eric Abrahamsen wrote:
>>>> I want to write my own command that finds the original group of the
>>>> article in question and executes the move in that group. Is there a
>>>> function that gets me the original group of an article in a virtual
>>>> group?
>>>
>>> I'm pretty sure that nnvirtual-find-group-art will do what you want.
>>> Feed it the article number of the article under point, along with
>>> gnus-newsgroup-name in the virtual Summary buffer. See how it works!
>>
>> Thank you for your quick reply! These to functions do what I want and I
>> get the correct original group and article. But now I am stuck and do
>> not know how to get to the original group. This is what I tried:
>>
>> #+BEGIN_SRC emacs-lisp
>> (defun my-nnvirtual-delete-article ()
>>   (interactive)
>>   (let ((original (nnvirtual-find-group-art
>>                    gnus-newsgroup-name
>>                    (gnus-summary-article-number))))
>>     (with-current-buffer gnus-group-buffer
>>       (gnus-group-goto-group (car original))
>>       (gnus-summary-goto-article (cdr original)))))
>> #+END_SRC
>
> All `gnus-group-goto-group' does is move to the group's line in the
> *Group* buffer. Try `gnus-group-read-group' instead. That -- or
> something involving that -- ought to do what you want.

Yes, gnus-group-read-group works! The following code takes the current
article and moves it from its original group to a specified trash
group:

#+BEGIN_SRC emacs-lisp
  (defun my-nnvirtual-delete-article ()
    (interactive)
    (let* ((original (nnvirtual-find-group-art
                      gnus-newsgroup-name
                      (gnus-summary-article-number)))
           (group (car original))
           (article (cdr original))
           (trash (cl-assoc group my-gnus-trash-locations
                            :test (lambda (item rx)
                                    (string-match-p rx item)))))
      (unless trash
        (error "No trash folder configured for group %s" group))
      (with-current-buffer gnus-group-buffer
        (gnus-group-read-group nil nil group (list article))
        (gnus-summary-move-article 1 (cdr trash)))))

  (defvar my-gnus-trash-locations 
    '(("nnmaildir\\+mailbox:.*" . "nnmaildir+mailbox:Trash"))
    "Locations of trash folders.")
#+END_SRC

The problem with this code is that I end up in the original group after
the moving/deleting is finished and not in the virtual group. This
surprises me, as I always thought of `with-current-buffer' as a macro
that save my window configuration. Apparently this is not the case, why
is that? 

Regards,
-- 
Alexander Baier