Re: suppress leading ":" in org-babel output

["Berry, Charles" <ccberry@ucsd.edu>]

> On May 27, 2019, at 7:17 PM, Nick Dokos <ndokos@gmail.com> wrote:
> 
> Jeremie Juste <jeremiejuste@gmail.com> writes:
> 
>> Hello,
>> 
>> I recall seeing this thread on the mailing list but I cannot find it
>> back.
>> 
>> I would like to suppress the first line leading ":" in the following output
>> 
>> 
>> #+NAME:mean_purchase_per_shopping_trip
>> 
>> #+BEGIN_SRC R :var x=6 :results output :session *R*
>> a <-sprintf("%.2f",12.234324)
>> cat(a,sep="\n")
>> #+END_SRC
>> 
>> #+RESULTS: mean_purchase_per_shopping_trip
>> : 
>> 
>> : 12.23
>> 
> 
> FWIW, I just get the last line:
> 
> #+NAME:mean_purchase_per_shopping_trip
> 
> #+BEGIN_SRC R :var x=6 :results output :session *R*
> a <-sprintf("%.2f",12.234324)
> cat(a,sep="\n")
> #+END_SRC
> 
> #+RESULTS:
> : 12.23
> 
> This is with 
> 
>   GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32) of 2019-05-01
>   Org mode version 9.2.3 (release_9.2.3-367-gd79e80 @ /home/nick/elisp/org-mode/lisp/)
>   R version 3.5.3 (2019-03-11) -- "Great Truth"
> 
> on Fedora 29.
> 

I get what Jeremie reports (but he has a blank line inserted after the first line, IIUC)

This is with:

GNU Emacs 26.1 
Org 9.2.3
ess-version: 18.10.3
R version 3.6.0 (2019-04-26)

I believe this is new-ish behavior. I see some older files without the extra line. Also, I think there are recent changes in ESS that pertain to comint sessions.

FWIW, here is a clip from my session:

--8<---------------cut here---------------start------------->8---
> x <- 6L
a <-sprintf("%.2f",12.234324)
cat(a,sep="\n")
'org_babel_R_eoe'
> > 
12.23
> 
[1] "org_babel_R_eoe"
--8<---------------cut here---------------end--------------->8---


If Nick sees something different maybe a change in ESS is the culprit.

Not sure what the right path forward is ob-R.el, but as a workaround the OP can use a :post header arg to strip the offending line.

HTH,

Chuck