Re: [O] "user-error: No language for src block: (unnamed)" when running `org-icalendar-combine-agenda-files`

[Charles C. Berry]

On Fri, 21 Aug 2015, Ista Zahn wrote:

> On Fri, Aug 21, 2015 at 11:04 AM, Nicolas Goaziou
> <address@hidden> wrote:
> > Ista Zahn <address@hidden> 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