Re: [O] [BABEL] Redirect stderr to stdout?

[Eric Schulte]

Viktor Rosenfeld <address@hidden> writes:

> Hi Eric,
>
> Eric Schulte wrote:
>
>> Currently the only action Babel takes with STDERR is to display it in a
>> pop-up buffer when code block evaluation fails.  
>
> On my system (OS X) the buffer does not popup. I just tried
>
> #+BEGIN_SRC sh
> echo foo 1>&2
> #+END_SRC
>

That is because the evaluation did not fail, try

#+BEGIN_SRC sh
echo foo 1>&2
exit 1
#+END_SRC

>
> in Aquamacs and Cocoa Emacs. Strangely, the output seems to be lost
> entirely.

I don't pretend to understand the many oddities of Aquamacs, and I don't
know what Cocoa Emacs is.

> Normally, stderr is captured in another buffer which I have to open
> manually.
>
>> It would certainly be
>> possible to add :results header argument to incorporate STDERR into
>> results (and this desire has been expressed previously).  Reasonable
>> combination options would likely include (at least) the following.
>> 
>> | stderr-only | return stderr instead of stdout    |
>> | 2>&1        | interleave stderr and stdout       |
>> | concat      | add stderr to the end of stdout    |
>> | list        | return a list of stderr and stdotu |
>> 
>> The best (read simple and extensible) implementation and syntax for this
>> behavior is not obvious to me (and I simply don't have time).  If you
>> (or anyone on the list) have any interest in hacking elisp code the
>> place to start would be `org-babel-eval' for a serious implementation,
>> or an quick hack may be possible through customization of the
>> `org-babel-eval-error-notify' function.
>> 
>> Hope this helps.
>
> Okay, thanks. My elisp skills are very rudimentary and this is beyond
> me. Maybe somebody else will pick it up if the interest is big enough.
>

This feature has been requested previously on the mailing list, so there
is certainly demand.  As always demand outstrips development resources.

Best,

>
> Cheers,
> Viktor
>

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/