Re: how to make gnus print various group lists to stdout

[Eric Abrahamsen <eric@ericabrahamsen.net>]

Tim Landscheidt <tim@tim-landscheidt.de> writes:

> Harry Putnam <reader@newsguy.com> wrote a long time ago:
>
>> […]
>
>>> you get a list of all groups.  If you use:
>
>>> | (dolist (group gnus-newsrc-alist)
>>> |   (if (equal (nth 4 group) '(nntp "news.gmane.org"))
>>> |       (insert (format "%s\n" (car group)))))
>
>>> you get a list of all groups for Gmane.
>
>> This second one looks like it could be edited to make it produce a
>> list from any foreign groups too.
>
>> I'm curious what the `nth 4 group' is all about... is it a reference
>> to level 4?
>
> No, it returns the fifth element of the list referred to by
> group (C-h f nth RET).
>
>> Also I should say that the second example does nothing here.. well it
>> prints `nil' when evaluated with C-x C-e
>
>> I do have gmane in ~/.gnus like this:
>
>>   (setq gnus-select-method '(nntp "news.gmane.org"))
>
> To be clear, my approach to gnus-newsrc-alist and other Gnus
> data structures is entirely example-based: I look at my data
> and see that my Gmane groups have the fifth element set to
> '(nntp "news.gmane.org"), so I search for that.
>
> That works for me because I have gnus-select-method set to
> '(nnml "private"), so Gmane groups are … foreign groups (?)
> which have their fifth element set to '(nntp
> "news.gmane.org").  With gnus-select-method set to Gmane,
> you will need to adapt the filter expression (maybe the
> fifth element is nil for native groups?).

Yes, that's right -- that element is only present for non-native groups.