From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Harkins <jamshark70@qq.com>
Subject: Exporter: Derived backend options-alist
Date: Mon, 02 Mar 2015 22:23:22 +0800
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To: orgmode <emacs-orgmode@gnu.org>

I'm trying to derive an exporter backend from ASCII. I need to add some export options, so I have:

#+BEGIN_SRC {emacs-lisp}
(org-export-define-derived-backend 'scdoc 'ascii
  :translate-alist  ... omitted for brevity...
  :options-alist
  '((:categories "CATEGORIES" nil nil t)
    (:related "RELATED" nil nil t)
    (:summary "SUMMARY" nil nil t)
    (:redirect "REDIRECT" nil nil t))
)

... snip snip...

(defun org-scdoc-template (contents info)
  "Return complete document string after SCDoc conversion.
CONTENTS is the transcoded contents string.  INFO is a plist
holding export options."
  (let* ((title (org-export-data (plist-get info :title) info))
	(categories (org-export-data (plist-get info :categories) info))
	(related (org-export-data (plist-get info :related) info))
	(summary (org-export-data (plist-get info :summary) info))
	(redirect (org-export-data (plist-get info :redirect) info))
	(output (format "TITLE:: %s\n" title)))
    (if categories (setq output (concat output (format "CATEGORIES:: %s\n" categories))))
    (if related (setq output (concat output (format "RELATED:: %s\n" categories))))
    (if summary (setq output (concat output (format "SUMMARY:: %s\n" categories))))
    (if redirect (setq output (concat output (format "REDIRECT:: %s\n" categories))))
    (concat output "\n\n" contents)))
#+END_SRC

(Pardon the un-idiomatic Emacs-lisp.)

Then I created an org file that begins:

#+BEGIN_SRC org
  ,#+title:: PulseCount
  ,#+summary:: Pulse counter.
  ,#+related:: Classes/Stepper
  ,#+categories:: UGens>Triggers

  ,* Description
  Each trigger increments a counter which is output as a signal.
#+END_SRC

Then I run org-scdoc-export-as-scdoc, and I get as the first few lines:

TITLE:: 
CATEGORIES:: 
RELATED:: 
SUMMARY:: 
REDIRECT:: 

... telling me that the template function retrieved empty strings for all the export options.

Obviously I've done something wrong, but... what? "(let ((title (org-export-data (plist-get info :title) info)))...)" is copied from ox-latex.el, and ox-latex clearly has no problem accessing the title.

Thanks in advance. I'm sure I'll have other questions later.

hjh