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;;; ob-calc.el --- org-babel functions for calc code evaluation
;; Copyright (C) 2010-2011 Free Software Foundation, Inc
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; Version: 7.4
;; 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."
(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]"))))
(save-excursion
(with-current-buffer (get-buffer "*Calculator*")
(calc-eval (calc-top 1)))))
(provide 'ob-calc)
;;; ob-calc.el ends here
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