bug#74905: [PATCH] Implement search for nnvirtual Gnus groups

["Björn Bidar via Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

James Thomas <jimjoe@gmx.net> writes:

> Björn Bidar wrote:
>
>> This patch implements search for nnvirtual. I'm using publi-inbox's
>> with nnvirtual to group each group into one.
>> However searching wasn't possible in these nnvirtual groups.
>> I implemented gnus-search-run-search based on the existing
>> nnselect gnus-search-run-search function.
>
> Thanks! I haven't looked into it, but here are some quick comments:
>
>> I'm looking for feedback on the patch. I don't exactly know how
>> the search function is called when multiple groups of the same type
>> are
>> involved. For nnvirtual each group is its on server, does that mean
>> the
>> function will be always called only for each group? In that case
>> everything should be good.
>
> That seems to be the case: see gnus-group-read-ephemeral-search-group
> and gnus-group-make-search-group.

OK good than my understanding from my tests matched with the rest of the
code.
Thanks for these examples I haven't looked at the create group functions
as the searched methods don't have to create groups even when they start
a new search by another backend just like e.g. if the user would call a
search on another imap group.

>> +(deffoo nnvirtual-request-list (&optional server)
>> +  (when (nnvirtual-possibly-change-server server)
>> +    (with-current-buffer nntp-server-buffer
>> +      (erase-buffer)
>> +      (dolist (group nnvirtual-component-groups)
>> +        (insert (format "%S 0  1 y\n" group))))
>> +    t))
>
> Did you check if gnus-start.el#L1801 withstands this? It seems to me to
> assume that nnvirtual doesn't have -request-list.

It does. If the user has falsely add nnvirtual to one of the select
methods than it will call it try to call the function which doesn't fail
or do anything. The only thing that happens from that is it will show
the false results as groups contained in the nnvirtual method without a
parameter.
Should verify that nnvirtual has arguments? So far it is possible
to add nnvirtual to select methods with "" but this is invalid.

If nnvirtual isn't added to select methods nothing happens besides
the regular activation.