[O] babel for ditaa-eps

[Arne Babenhauserheide (IMK)]

Dear org hackers,

I don’t know if there’s already a babel-ditaa-option for using
ditaa-eps, so I modified ob-ditaa.el to use ditaa-eps and convert the
result using epstopdf.

Feel free to use it.

;;; ob-ditaa-eps.el --- org-babel functions for ditaa evaluation

;; Copyright (C) 2009-2012  Free Software Foundation, Inc.

;; Author: Eric Schulte und Arne Babenhauserheide
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Org-Babel support for evaluating ditaa source code as eps/pdf.
;;
;; Almost verbatim copy from ob-ditaa, but with ditaa-eps and epstopdf
;; as intermediate step.
;;
;; Ditaa differs from most standard languages in that
;;
;; 1) there is no such thing as a "session" in ditaa
;;
;; 2) we are generally only going to return results of type "file"
;;
;; 3) we are adding the "file" and "cmdline" header arguments
;;
;; 4) there are no variables (at least for now)

;;; Code:
(require 'ob)

(defvar org-babel-default-header-args:ditaa-eps
  '((:results . "file") (:exports . "results") (:java .
"-Dfile.encoding=UTF-8"))
  "Default arguments for evaluating a ditaa source block.")

(defcustom org-ditaa-eps-jar-path (expand-file-name
                            "DitaaEps.jar"
                            (file-name-as-directory
                             (expand-file-name
                              "scripts"
                              (file-name-as-directory
                               (expand-file-name
                                "../contrib"
                                (file-name-directory (find-library-name 
"org")))))))
  "Path to the ditaa-eps jar executable."
  :group 'org-babel
  :type 'string)


(defvar org-ditaa-eps-jar-path)
(defun org-babel-execute:ditaa-eps (body params)
  "Execute a block of Ditaa code with org-babel.
This function is called by `org-babel-execute-src-block'."
  (let* ((result-params (split-string (or (cdr (assoc :results params))
"")))
         (out-file ((lambda (el)
                      (or el
                          (error
                           "ditaa code block requires :file header argument")))
                    (cdr (assoc :file params))))
         (cmdline (cdr (assoc :cmdline params)))
         (java (cdr (assoc :java params)))
         (in-file (org-babel-temp-file "ditaa-"))
         (cmd0 (concat "java " java " -jar "
                      (shell-quote-argument
                       (expand-file-name org-ditaa-eps-jar-path))
                      " " cmdline
                      " " (org-babel-process-file-name in-file)
                      " " (org-babel-process-file-name (concat in-file 
".eps"))))
         (cmd1 (concat "epstopdf"
                      " " (org-babel-process-file-name (concat in-file ".eps"))
                      " -o=" (org-babel-process-file-name out-file))))
    (unless (file-exists-p org-ditaa-eps-jar-path)
      (error "Could not find ditaa.jar at %s" org-ditaa-eps-jar-path))
    (with-temp-file in-file (insert body))
    (message cmd0) (shell-command cmd0)
    (message cmd1) (shell-command cmd1)
    nil)) ;; signal that output has already been written to file

(defun org-babel-prep-session:ditaa-eps (session params)
  "Return an error because ditaa does not support sessions."
  (error "Ditaa does not support sessions"))

(defun ditaa-eps-mode ()
  (artist-mode))

(provide 'ob-ditaa-eps)

;;; ob-ditaa-eps.el ends here

Best wishes,
Arne

ob-ditaa-eps.el
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