Re: Deleting mail in virtual group

[Eric Abrahamsen <eric@ericabrahamsen.net>]

Alexander Baier <alexander.baier@mailbox.org> writes:

> 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? 

That I can't tell you! My only guess is that virtual group *Summary*
buffer is actually getting destroyed in the process of shifting groups
and moving messages, and there's nowhere to return to. You could test by
manually replicating what `with-current-buffer' does: save the current
buffer in your let form, then try to `switch-to-buffer' back to it when
the article's been moved, and see if it still exists.

Eric