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+;;; ob-calc.el --- org-babel functions for calc code evaluation
+
+;; Copyright (C) 2010  Free Software Foundation, Inc
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+;; Version: 7.3
+
+;; 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 calc code
+
+;;; Code:
+(require 'ob)
+(require 'calc)
+(require 'calc-trail)
+(eval-when-compile (require 'ob-comint))
+
+(defvar org-babel-default-header-args:calc nil
+  "Default arguments for evaluating an calc source block.")
+
+(defun org-babel-expand-body:calc (body params)
+  "Expand BODY according to PARAMS, return the expanded body." body)
+
+(defun org-babel-execute:calc (body params)
+  "Execute a block of calc code with Babel."
+  (mapcar
+   (lambda (line)
+     (when (> (length line) 0)
+       (if (string= "'" (substring line 0 1))
+	   (funcall (lookup-key calc-mode-map (substring line 1)) nil)
+	 (calc-push-list
+	  (list ((lambda (res)
+		   (cond
+		    ((numberp res) res)
+		    ((listp res) (error "calc error \"%s\" on input \"%s\""
+					(cadr res) line))
+		    (t res))
+		   (if (numberp res) res (math-read-number res)))
+		 (calc-eval line)))))))
+   (mapcar #'org-babel-trim
+	   (split-string (org-babel-expand-body:calc body params) "[\n\r]")))
+  (save-excursion
+    (set-buffer (get-buffer "*Calculator*"))
+    (calc-eval (calc-top 1))))
+
+(provide 'ob-calc)
+
+;; arch-tag: 5c57a3b7-5818-4c6c-acda-7a94831a6449
+
+;;; ob-calc.el ends here