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;;; ob-calc.el --- org-babel functions for calc code evaluation

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;; Copyright (C) 2010-2011  Free Software Foundation, Inc
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;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
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;; Version: 7.4
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;; 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."
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  (unless (get-buffer "*Calculator*")
    (save-window-excursion (calc) (calc-quit)))
  (let* ((vars (mapcar #'cdr (org-babel-get-header params :var)))
	 (var-syms (mapcar #'car vars))
	 (var-names (mapcar #'symbol-name var-syms)))
    (mapc
     (lambda (pair)
       (calc-push-list (list (cdr pair)))
       (calc-store-into (car pair)))
     vars)
    (mapc
     (lambda (line)
       (when (> (length line) 0)
	 (cond
	  ;; simple variable name
	  ((member line var-names) (calc-recall (intern line)))
	  ;; stack operation
	  ((string= "'" (substring line 0 1))
	   (funcall (lookup-key calc-mode-map (substring line 1)) nil))
	  ;; complex expression
	  (t
	   (calc-push-list
	    (list ((lambda (res)
		     (cond
		      ((numberp res) res)
		      ((math-read-number res) (math-read-number res))
		      ((listp res) (error "calc error \"%s\" on input \"%s\""
					  (cadr res) line))
		      (t (calc-eval
			  (math-evaluate-expr
			   ;; resolve user variables, calc built in
			   ;; variables are handled automatically
			   ;; upstream by calc
			   (mapcar (lambda (el)
				     (if (and (consp el) (equal 'var (car el))
					      (member (cadr el) var-syms))
					 (progn
					   (calc-recall (cadr el))
					   (prog1 (calc-top 1)
					     (calc-pop 1)))
				       el))
				   ;; parse line into calc objects
				   (car (math-read-exprs line))))))))
		   (calc-eval line))))))))
     (mapcar #'org-babel-trim
	     (split-string (org-babel-expand-body:calc body params) "[\n\r]"))))
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  (save-excursion
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    (with-current-buffer (get-buffer "*Calculator*")
      (calc-eval (calc-top 1)))))
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(provide 'ob-calc)


;;; ob-calc.el ends here