[O] graphviz dot block export and evaluate

2012-09-28 Thread Dmitri Makarov 
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

Re: [O] graphviz dot block export and evaluate

2012-09-28 Thread Bastien 
Hi Dmitri,

Dmitri Makarov dmak...@gmail.com writes:

#+BEGIN_SRC dot :export both
  digraph G {
A - B
  }
#+END_SRC

You need a :file parameter:

#+BEGIN_SRC dot :file test.png :export both
digraph G {
  A - B
}
#+END_SRC

HTH,

-- 
 Bastien

Re: [O] graphviz dot block export and evaluate

2012-09-28 Thread Thomas S. Dye 
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

Re: [O] graphviz dot block export and evaluate

2012-09-28 Thread Dmitri Makarov 
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