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From: Éibhear <eibhear.geo@gmail.com>
To: aaronecay@gmail.com, Org Mode <emacs-orgmode@gnu.org>
Subject: Re: [PATCH] Prevent overwriting of output files from babel calls with nil result
Date: Fri, 30 Oct 2015 23:41:13 +0000	[thread overview]
Message-ID: <56340019.8020904@gmail.com> (raw)
In-Reply-To: <87ziz1wim9.fsf@gmail.com>

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On 29/10/15 19:59, Aaron Ecay wrote:
> Hi Éibhear,
> 
> Thanks for sending the example.  I think it is not expected to
> work going forward because the lisp block relies on being able to
> pick up the value of ‘params’, which will not be possible now that
> org is moving to lexical binding.  In general,
> org-babel-execute:foo are internal functions, so trying to trick
> them int working properly in an elisp code block is a bad idea.
> 
> The emacs-lisp babel backend is special, so I can’t predict what
> the result would be of making it return the symbol nil instead of
> the string “nil.”  (Though for the sake of consistency it ought to
> allow nil symbol returns.)
> 
> On the balance, I recommend you do something like the following,
> using two code blocks (untested):
> 
> ,---- | #+name: dot-code | #+begin_src emacs-lisp :results
> verbatim | (generate-dot-code) | #+end_src | | #+RESULTS: dot-code 
> | : "your dot code will appear here" | | #+begin_src dot :file
> foo.png :var code=dot-code() | $code | #+end_src | | #+RESULTS: |
> [[file:foo.png]] `----
> 
> Hope this helps,
> 

Thanks Aaron.

The following works (":results raw" being the significant change):

,----
| #+name: dot-code
| #+begin_src emacs-lisp :results raw
| (generate-dot-code)
| #+end_src
|
| #+RESULTS: dot-code
|
| #+begin_src dot :file foo.png :var code=dot-code()
| $code
| #+end_src
|
| #+RESULTS:
| [[file:foo.png]]
`----

Éibhear

- -- 
Éibhear Ó hAnluain
Dublin, Ireland.
+-------------------------------+--------------------------------+
| e-mail: eibhear.geo@gmail.com | Web: [http://www.gibiris.org/] |
| Twitter: @eibhear             | Google+: +Éibhear Ó hAnluain   |
| Mobile: +353 86 856 5666      | VoIP: sip:eibhear@linphone.org |
+-------------------------------+--------------------------------+
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next prev parent reply	other threads:[~2015-10-30 23:40 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-27 22:55 [PATCH] Prevent overwriting of output files from babel calls with nil result Éibhear
2015-10-29 13:53 ` Aaron Ecay
2015-10-29 17:31   ` "Éibhear"
2015-10-29 19:59     ` Aaron Ecay
2015-10-30 23:41       ` Éibhear [this message]
2015-11-04 10:59         ` Aaron Ecay

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