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Re: [O] [babel, ess] How can I make S-RET to be multi-session friendly?

From: Eric Schulte
Subject: Re: [O] [babel, ess] How can I make S-RET to be multi-session friendly?
Date: Fri, 10 Aug 2012 21:37:03 -0600
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux)

>> Yes, the order of precedence is
>> system-level < buffer/subtree-level < language-level <
>> code-block-level
> Then I'd say buffer level does NOT override system-level for some
> reason.

I believe you mean the buffer-level does not override the

> I just re-built Emacs from bzr to make sure I'm running somewhat
> recent Org.
> Another weird thing is that when I tried to use Org from git (and not
> the stock one), Emacs freezes deadly on
> (org-clock-persistence-insinuate) unless I kill ntvdm.exe with Task
> Manager (I'm on Windows). But I guess it is a separate story.

I have no idea what could be causing the above, but it seems unrelated.

>>> ,----[ snippet from dot emacs ]
>>> | (setq org-babel-default-header-args:R
>>> |       '((:results . "output") (:session . "*R*")))
>>> `----
>> Given that (:session . "*R*") will be used by default you could simply
>> remove it from your custom setting for org-babel-default-header-args.
> This made a trick. Now indeed I have *Rreport* after C-c C-c on code
> block. However after C-c ' whenever I attempt to S-RET, yet another *R*
> is launched every time instead of evaluating a line.
> So the question perhaps is:
> How to alter [1] such that when I edit code block with C-c ' , S-RET
> executes lines in a proper session. I believe all information is in
> there, I just have no clue how would I extract it, e.g. to which main
> buffer that code editing buffer (I don't know the right name for it)
> belongs to, and what session header is set to in that buffer.
> If there is a way to fetch those, perhaps I'd be able to alter original
> set up in [1].

You can find the name of the original org-mode buffer by running the
following snippet of elisp within the edit buffer.

    ;; -*- emacs-lisp -*-
    (marker-buffer org-edit-src-beg-marker)

The `org-src-in-org-buffer' macro may be used from an edit buffer to run
elisp inside the code block, in the org-mode buffer of the edit buffer.
e.g., the following 

    ;; -*- emacs-lisp -*-
    (org-src-in-org-buffer (message "-->%S" (org-babel-get-src-block-info)))


>>> Footnotes: 
>>> [1]
>>> http://www.kieranhealy.org/blog/archives/2009/10/12/make-shift-enter-do-a-lot-in-ess/

Eric Schulte

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