[Orgmode] Re: [org-babel] Using the power of ESS inside an R source code block

[Dan Davison]

"Eric Schulte" <address@hidden> writes:

> Hi Bernd,
>
> It seems that you have already found the best solution in the indirect
> edit buffers (by calling C-c ' from inside of a code block).  I would
> only add that in the email you mentioned below, I was specifically
> talking about syntax highlighting of R code in Org-mode buffers, which
> at the time I believed was not possible.  It would seem I was wrong, as
> such syntax highlighting is now implemented in recent versions of
> Org-mode through setting the `org-src-fontify-natively' variable.
>
> Hope you enjoy using Org-mode with Ess.
>
> Best -- Eric
>
> Bernd Weiss <address@hidden> writes:
>
>> Am 24.10.2010 05:44, schrieb Bernd Weiss:

Hi Bernd,

>>> Dear all,
>>>
>>> Yesterday, I spent some time (re-)discovering the power of org-babel
>>> and R. Everything works well but there is one issue that I find
>>> somewhat annoying (I apologise if this word is too rude).

Not at all. Good to know what drawbacks users are encountering. I'm
happy to report that all three of the things you mention are now
possible in the Org buffer. You will need to be using a recent version
of Org-mode (i.e. from within the last few weeks).

>>> As a
>>> long-time ESS user I wish that I could use things like ESS syntax
>>> highlighting,

This, as Eric mentioned, is turned on with
`org-src-fontify-natively'. However from your config below it seems you
have set this variable. So that requires some explanation -- please let
us know if syntax highlighting in the Org buffer is working for you or
not.

>>> indentation 

Setting `org-src-tab-acts-natively' causes TAB to have the indenting
effect that you would get in an ESS buffer.[2]

Beyond these two variables, there is a general method that addresses the
issues you are raising. It involves using the function
`org-babel-do-key-sequence-in-edit-buffer'. For example, here is how to
make C-M-\ perform language-specific indentation on the active region in
the source block:

  (defun dan/org-indent-region ()
    (interactive)
    (or (org-babel-do-key-sequence-in-edit-buffer "\C-\M-\\")
        (indent-region)))

   (define-key org-mode-map "\C-\M-\\" 'dan/org-indent-region)


>>> or some keybindings (e.g. for "<-") inside
>>> an R source code block.

This one can be done with

  (defun dan/org-underscore-command ()
    (interactive)
    (or (org-babel-do-key-sequence-in-edit-buffer "_")
        (org-self-insert-command 1)))

   (define-key org-mode-map "_" 'dan/org-underscore-command)

And another one that you may like is for commenting code:

  (defun dan/org-comment-dwim (&optional arg)
    (interactive "P")
    (or (org-babel-do-key-sequence-in-edit-buffer "\M-;")
        (comment-dwim arg)))

   (define-key org-mode-map "\M-;" 'dan/org-comment-dwim)


I hope the above supplies the missing functionality.

Dan

>>> However, with respect to an e-mail from Eric
>>> Schulte
>>>
>>> http://www.mail-archive.com/address@hidden/msg22301.html
>>>
>>> (or this one:
>>> https://stat.ethz.ch/pipermail/ess-help/2009-September/005544.html )
>>>
>>> this seems to be a feature wich is hard to realise inside org-babel.
>>> Is this (still) correct? Or is it a problem with my
>>> installation/initialisation of org-mode/org-babel?[1]
>>
>>
>> Ok, one workaround are indirect buffers, right? This blog post is
>> really helpful (see "A note about syntax highlighting in Emacs")
>>
>> http://blogisticreflections.wordpress.com/2010/05/23/introduction-to-using-r-with-org-babel-part-1/
>>
>> Bernd
>>
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