From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <n.goaziou@gmail.com>
Subject: Re: new exporter, conditional options according to backend
Date: Sat, 19 Jan 2013 23:48:29 +0100
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References: <87hame8pdk.fsf@david.espiga4.com.ar>
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In-Reply-To: <87hame8pdk.fsf@david.espiga4.com.ar> (Ezequiel Birman's message
	of "Fri, 18 Jan 2013 12:47:19 -0300")
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To: Ezequiel Birman <stormwatch@espiga4.com.ar>
Cc: emacs-orgmode@gnu.org

Hello,

Ezequiel Birman <stormwatch@espiga4.com.ar> writes:

> Is it possible to write something like this with the new exporter?
>
> #+OPTIONS: (if (and (boundp 'org-export-current-backend) (eq org-export-current-backend 'e-beamer)) "H:1" "H:3")

There is no `org-export-current-backend' in the new exporter. Besides,
what you want is the default behaviour (see `org-e-beamer-frame-level'
variable).

> From what I read in org-export.el the backend is stored in a plist, not
> sure how to get it's value when exporting.
>
> Or, maybe I need to write a filter function to be run from
> org-export-before-process-hook?

Filters are different from hook. A function in a hook operates on an Org
buffer. A filter function operates either on a string in output syntax
or on the parse tree.

If, for some reason, you want to modify export options "on the fly", you
could create a filter function for parse tree, and modify options plist
from it:

#+begin_src emacs-lisp
(defun my-options-change-fun (tree backend info)
  (when (org-export-derived-backend-p backend 'e-beamer)
    (plist-put info :with-author nil))
  ;; Don't forget to return tree.
  tree)

(add-to-list 'org-export-filter-parse-tree-functions
             'my-options-change-fun)
#+end_src


Regards,

-- 
Nicolas Goaziou