;;; ob-dot.el --- org-babel functions for dot evaluation ;; Copyright (C) 2009-2014 Free Software Foundation, Inc. ;; Author: Eric Schulte ;; 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 dot source code. ;; ;; For information on dot see http://www.graphviz.org/ ;; ;; This differs from most standard languages in that ;; ;; 1) there is no such thing as a "session" in dot ;; ;; 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:dot '((:results . "file") (:exports . "results")) "Default arguments to use when evaluating a dot source block.") (defun org-babel-expand-body:dot (body params) "Expand BODY according to PARAMS, return the expanded body." (let ((vars (mapcar #'cdr (org-babel-get-header params :var)))) (mapc (lambda (pair) (let ((name (symbol-name (car pair))) (value (cdr pair))) (setq body (replace-regexp-in-string (concat "\$" (regexp-quote name)) (if (stringp value) value (format "%S" value)) body)))) vars) body)) (defun org-babel-execute:dot (body params) "Execute a block of Dot code with org-babel. This function is called by `org-babel-execute-src-block'." (let* ((result-params (cdr (assoc :result-params params))) (out-file (cdr (or (assoc :file params) (error "You need to specify a :file parameter")))) (cmdline (or (cdr (assoc :cmdline params)) (format "-T%s" (file-name-extension out-file)))) (cmd (or (cdr (assoc :cmd params)) "dot")) (in-file (org-babel-temp-file "dot-"))) (with-temp-file in-file (insert (org-babel-expand-body:dot body params))) (org-babel-eval (concat cmd " " (org-babel-process-file-name in-file) " " cmdline " -o " (org-babel-process-file-name out-file)) "") nil)) ;; signal that output has already been written to file (defun org-babel-prep-session:dot (session params) "Return an error because Dot does not support sessions." (error "Dot does not support sessions")) (provide 'ob-dot) ;;; ob-dot.el ends here