lisp/ob-ditaa.el

   1 ;;; ob-ditaa.el --- org-babel functions for ditaa evaluation
   2
   3 ;; Copyright (C) 2009-2012  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Org-Babel support for evaluating ditaa source code.
  27 ;;
  28 ;; This differs from most standard languages in that
  29 ;;
  30 ;; 1) there is no such thing as a "session" in ditaa
  31 ;;
  32 ;; 2) we are generally only going to return results of type "file"
  33 ;;
  34 ;; 3) we are adding the "file" and "cmdline" header arguments
  35 ;;
  36 ;; 4) there are no variables (at least for now)
  37 ;;
  38 ;; 5) it depends on a variable defined in org-exp-blocks (namely
  39 ;;    `org-ditaa-jar-path') so be sure you have org-exp-blocks loaded
  40
  41 ;;; Code:
  42 (require 'ob)
  43
  44 (defvar org-ditaa-jar-path) ;; provided by org-exp-blocks
  45
  46 (defvar org-babel-default-header-args:ditaa
  47   '((:results . "file")
  48     (:exports . "results")
  49     (:java . "-Dfile.encoding=UTF-8"))
  50   "Default arguments for evaluating a ditaa source block.")
  51
  52 (defcustom org-ditaa-jar-option "-jar"
  53   "Option for the ditaa jar file.
  54 Do not leave leading or trailing spaces in this string."
  55   :group 'org-babel
  56   :version "24.1"
  57   :type 'string)
  58
  59 (defun org-babel-execute:ditaa (body params)
  60   "Execute a block of Ditaa code with org-babel.
  61 This function is called by `org-babel-execute-src-block'."
  62   (let* ((result-params (split-string (or (cdr (assoc :results params)) "")))
  63          (out-file ((lambda (el)
  64                       (or el
  65                           (error
  66                            "ditaa code block requires :file header argument")))
  67                     (cdr (assoc :file params))))
  68          (cmdline (cdr (assoc :cmdline params)))
  69          (java (cdr (assoc :java params)))
  70          (in-file (org-babel-temp-file "ditaa-"))
  71          (cmd (concat "java " java " " org-ditaa-jar-option " "
  72                       (shell-quote-argument
  73                        (expand-file-name org-ditaa-jar-path))
  74                       " " cmdline
  75                       " " (org-babel-process-file-name in-file)
  76                       " " (org-babel-process-file-name out-file))))
  77     (unless (file-exists-p org-ditaa-jar-path)
  78       (error "Could not find ditaa.jar at %s" org-ditaa-jar-path))
  79     (with-temp-file in-file (insert body))
  80     (message cmd) (shell-command cmd)
  81     nil)) ;; signal that output has already been written to file
  82
  83 (defun org-babel-prep-session:ditaa (session params)
  84   "Return an error because ditaa does not support sessions."
  85   (error "Ditaa does not support sessions"))
  86
  87 (provide 'ob-ditaa)
  88
  89
  90
  91 ;;; ob-ditaa.el ends here