Hi Tom and Bastien,
Thank you, your answers helped a lot.
My fault that I used "export" not "exports" and that I didn't read the section
Specific header arguments in the Org manual.
Thanks!
Dmitri
On Sep 28, 2012, at 7:14 PM, t...@tsdye.com (Thomas S. Dye) wrote:
> Dmitri Makarov <dmak...@gmail.com> writes:
>
>> Hi all,
>>
>> Has anyone successfully exported and evaluated src blocks with
>> graphviz dot code?
>> I'm trying to export this block
>>
>> #+BEGIN_SRC dot :export both
>> digraph G {
>> A -> B
>> }
>> #+END_SRC
>>
>> and I'm getting the error
>>
>> org-babel-exp processing...
>> executing Dot code block...
>> file-name-extension: Wrong type argument: stringp, nil
>>
>> How do you debug such problems?
>>
>> Regards,
>>
>> Dmitri
>
> Aloha Dmitri,
>
> Currently, you can debug such problems by looking at the source code of
> ob-dot.el. Or, by asking the list, as you did.
>
> Your example is lacking a :file header argument. dot source code blocks
> produce graphics files and babel leaves it to the user to name the
> output file. The file-name-extension function is looking for the value
> of the :file header argument, so that it can configure the call to dot.
> It is expecting to see a string, but gets nil because the header
> argument is absent.
>
> Also, the correct keyword is :exports, with a final "s".
>
> You can find an example of dot code use here:
> http://www.jstatsoft.org/v46/i03
>
> hth,
> Tom
> --
> Thomas S. Dye
> http://www.tsdye.com
