From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Moe <mail@christianmoe.com>
Subject: Re: How to export property values of agenda selection?
Date: Tue, 26 Mar 2013 23:53:01 +0100
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References: <loom.20130326T184953-124@post.gmane.org>
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To: Karl Maihofer <ignoramus@gmx.de>
Cc: emacs-orgmode@gnu.org


Karl Maihofer writes:
> * Peter Mayer						      :topic1:topic2:
> :PROPERTIES:
> :EMAIL:    peter@mayer.com
> :END:
> * Karl August					       :topic1:topic2:topic4:
> :PROPERTIES:
> :EMAIL: karl@august.com
> :END:
> * Peter Müller							     :topic1:
> :PROPERTIES:
> :EMAIL:    peter@mueller.com
> :END:
[...]
> What I'd like to do now is to export a comma-separated list of the email
> addresses of the entries in the agenda selection:
> "peter@mayer.com,karl@august.com" in the case above.

I don't know how to do it from the agenda selection, but here's a pretty
simple way to do it in the document buffer using Babel:

#+NAME: list2csv
#+BEGIN_SRC emacs-lisp :var match="topic2"
      (mapconcat 'identity 
                 (org-map-entries 
                  '(org-entry-get (point) "EMAIL") 
                  match nil)
                 ",")
#+END_SRC

Now you can use a CALL line with a tags match as a parameter, like

#+CALL: list2csv(match="topic2")

to get

#+RESULTS: list2csv(match="topic2")
: peter@mayer.com,karl@august.com

Yours,
Christian