From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Holst <thomas.holst@de.bosch.com>
Subject: Re: Bug: ditaa breaks export [7.8.03]
Date: Wed, 29 Feb 2012 13:39:04 +0100
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References: <CAE4hOxJy9SkbES8pLLuHM3n-xy7TMZLnWfF5BNGECe3pYghxLQ@mail.gmail.com>
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In-Reply-To: <CAE4hOxJy9SkbES8pLLuHM3n-xy7TMZLnWfF5BNGECe3pYghxLQ@mail.gmail.com>
	(Ian Dalton's message of "Wed, 29 Feb 2012 00:40:03 +0100")
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To: Ian Dalton <iain.dalton@gmail.com>
Cc: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>

Hello orgers,

=B7 Ian Dalton <iain.dalton@gmail.com> wrote:

> When I run `emacs -q' and evaluate `(setq org-babel-load-languages
> '((ditaa . t)))', then try to export an org document to PDF, after
> answering yes to "Evaluate this ditaa code block", I get:
>
> Wrong type argument: stringp, nil
>
> Emacs  : GNU Emacs 24.0.93.1 (i486-pc-linux-gnu, GTK+ Version 2.20.1)
>  of 2012-02-22 on cw-bkp0, modified by Debian
> Package: Org-mode version 7.8.03

I can confirm this.

A little investigation shows that there are two definitions for
`org-ditaa-jar-path':

- in =3Dlisp/ob-ditaa.el=3D:
  #+begin_src emacs-lisp
    (defcustom org-ditaa-jar-path nil
      "Path for the ditaa jar file."
      :group 'org-babel
      :type 'string)
  #+end_src

  This results in nil and so the error occurs.
 =20
- in =3Dlisp/org-exp-blocks.el=3D
  #+begin_src emacs-lisp
    (defvar org-ditaa-jar-path (expand-file-name
    			    "ditaa.jar"
    			    (file-name-as-directory
    			     (expand-file-name
    			      "scripts"
    			      (file-name-as-directory
    			       (expand-file-name
    				"../contrib"
    				(file-name-directory (or load-file-name buffer-file-name)))))))
      "Path to the ditaa jar executable.")
  #+end_src

  On my machine this results in the correct path.

So the value of `org-ditaa-jar-path' depends on the loading sequence of
el-files.

A quick solution for OP would be to the set the path

#+begin_src emacs-lisp
  (setq org-ditaa-jar-path "<path-to-ditaa-jar>")
#+end_src

I am not too deep into dependencies of org files, but ob-ditaa.el could
require org-exp-blocks and skip the definition of `org-ditaa-jar-path'.
Or vice versa.

HTH
--=20
Mit freundlichen Gr=FC=DFen / Best regards=20

Thomas