Invalid custom agenda command type timeline

["Sebastien Vauban" <wxhgmqzgwmuf-geNee64TY+gS+FvcfC7Uqw@public.gmane.org>]

Hello,

"Sebastien Vauban" wrote:
> I'd like to get the timeline view as an agenda custom command, because I'd
> like reports to be automated for a particular Org file (eventually with its
> contents exported to HTML, for example).
>
> Though, such trials fail ("Invalid custom agenda command type timeline"):
>
> #+begin_src emacs-lisp
>   (add-to-list 'org-agenda-custom-commands
>                '("A"
>                  timeline ""
>                  ;; ... specify on which file
>   ))
> #+end_src
>
> I guess it's because the concept of "current buffer" is not expressable as is?

This last sentence is wrong, as `occur-tree' is well a custom agenda command,
and works on the current buffer (at call time).

So, is there a more fundamental reason why timeline does not exist?  Will this
ever be changed?

Best regards,
  Seb

-- 
Sebastien Vauban