[ sorry for the slow response ]
Alexander Adolf writes:
[...]
> and achieve an agenda with three sections:
> 1) (agenda "" nil)
> 2) all todos with some planning information (scheduled or deadline)
> 3) all todos without any planning information
>
> Number 1 I already have. Number 3 can be achieved with
>
> (org-agenda-skip-function '(org-agenda-skip-if nil '(scheduled deadline)))
>
> But what about number 2? I searched the docs and code, bout couldn't
> seem to find anything.
>
> I hence ended up with the idea that I would need a new function,
> hypothetically (and cunningly) called org-agenda-skip-unless, which
> would do the same as org-agenda-skip-if, but with inverted logic.
I'm not necessarily against the idea, though I'm not yet convinced
there's a big need...
> With that, my dream agenda would be:
>
> (setq org-agenda-custom-commands
> '(("n" "Agenda and all TODOs"
> ((agenda "" nil)
> (alltodo "" ((org-agenda-block-separator "")
> (org-agenda-overriding-header "TODO items with a date:")
> (org-agenda-skip-function '(org-agenda-skip-unless nil
> '(scheduled deadline)))))
org-agenda-skip-if accepts notscheduled and notdeadline conditions.
Passing them both to a single org-agenda-skip-if wouldn't do what you
want because org-agenda-skip-if combines its conditions with `or'.
However, you could combine two separate org-agenda-skip-if calls:
(org-agenda-skip-function
'(and (org-agenda-skip-if nil '(notscheduled))
(org-agenda-skip-if nil '(notdeadline))))
