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* Bug: :session results in unfriendly error reporting
@ 2021-08-15 23:41 James Powell
  2021-08-16 18:25 ` Berry, Charles via General discussions about Org-mode.
  0 siblings, 1 reply; 7+ messages in thread
From: James Powell @ 2021-08-15 23:41 UTC (permalink / raw)
  To: emacs-orgmode

I write a deliberate syntax error into a code block:

: #+begin_src R :session
:   x <- 1
:   y xx z
: #+end_src

I put my cursor in there and C-c C-c.

What I expect: a gentle useful report about the error.
Maybe even org would move the cursor to the point of the
error in the org buffer.  If not, at least the buffer
"*Org-Babel Error Output*" will open and show me the error,
something like this (see also [1]),

: Error: unexpected symbol in:
: "x <- 1
: y xx"
: -UUU:@**--F2  *Org-Babel Error Output*   All L17    (Compilation etu) 
4:13PM 0.53 Mail --------------------------------------------------$

What happens instead:

- the *R* buffer is displayed.  It contains a long spammy traceback
   that has run off of the top of the screen.  To learn more I have to
   move the cursor into the *R* buffer and page back to the top of the

On the other hand, if I set ":session none", I get much friendlier
behavior.  The Error Output buffer opens with the simple error message
in it as I showed above when I use this source block:

: #+begin_src R :session none
:   x <- 1
:   y xx z
: #+end_src

I do not want to abandon :session because my code reads in a lot of
data to get started and I want my scripts, not my environment to be
"real" so I am not depending on R's ability to save and reload the
workspace at all [2] or on "Org's (clever and useful but) somewhat clunky
and inflexible method of passing data explicitly" [3].

Is there a way to get back to the "Error Output" buffer opening with a
simple message /while/ having :session being enabled?

thank you,
   James P.


[1] "Currently the only action Babel takes with STDERR is to display it in a
     pop-up buffer when code block evaluation fails" (Eric Schulte in 
2012, at

[2] « what will you save as your lasting record of what happened?
   [...[ As a beginning R user, it's OK to consider your environment
   [...]  "real."  However, in the long run, you'll be much better off
   if you consider your R scripts as "real." » (p. 111, Wickham, H. "R
   for data science : import, tidy, transform, visualize, and model
   data" O'Reilly Media, 2016).  To facilitate this, I have disabled
   'save workspace' permanently:
   : q <- function (save = "no", status = 0, runLast = TRUE)
   : .Internal(quit(save, status, runLast))

[3] «When I look at Org and think of "session-based" blocks, I see a
     potential big benefit in having multiple source-blocks throughout
     my document share the same session»
     the only good hit for a search for "session Org-Babel Error Output" at
     https://lists.gnu.org/archive/html/emacs-orgmode/ as of
     [2021-08-15 Sun]).

James E. Powell, MS
Pronouns: he/him/his
Applied Physics PhD Candidate
Department of Physics
Portland State University
Home page: http://web.pdx.edu/~powellj
Office: SRTC 409B Phone: +1-503-725-8515

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2021-09-27  9:53 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-15 23:41 Bug: :session results in unfriendly error reporting James Powell
2021-08-16 18:25 ` Berry, Charles via General discussions about Org-mode.
2021-08-17  5:02   ` Greg Minshall
2021-08-17  6:23     ` Tim Cross
2021-08-17  7:44       ` Greg Minshall
2021-09-27  8:42         ` Bastien
2021-09-27  9:52       ` Greg Minshall

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