From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: "user-error: No language for src block: (unnamed)" when running
 `org-icalendar-combine-agenda-files`
Date: Fri, 21 Aug 2015 13:19:52 -0700
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To: Ista Zahn <istazahn@gmail.com>
Cc: Andreas Leha <andreas.leha@med.uni-goettingen.de>, emacs-orgmode Mailinglist <emacs-orgmode@gnu.org>

On Fri, 21 Aug 2015, Ista Zahn wrote:

> On Fri, Aug 21, 2015 at 11:04 AM, Nicolas Goaziou
> <mail@nicolasgoaziou.fr> wrote:
>> Ista Zahn <istazahn@gmail.com> writes:
>>
>>> I agree that it is safer. In my case its safer like a 10 MPH speed
>>> limit. Safe yes, but too slow!
>>
>> Doesn't Babel :cache property help here?
>
> It does actually, to my surprise. I have not been using :cache because
> the documentation says
>
> "Note that the :cache header argument will not attempt to cache
> results when the :session header argument is used"
>
> and since I almost always use :session I didn't expect this to work.
> To my surprise it does (at least with R source blocks, I haven't
> tested yet with others). Can I now rely on this to work even with
> :session?


AFAICS, (reading `org-babel-exp-do-export') if you do not 
use `:results silent' it will work.

Where this does not work is when `:results silent' is used.

This does not execute a second time:

#+BEGIN_SRC R :results output :session :cache yes
date()
#+END_SRC

but changing to `:results silent' will run without updating the cached 
RESULTS (if any) every time.

HTH,

Chuck