;;; org-babel-emacs-lisp.el --- org-babel functions for emacs-lisp code evaluation

;; Copyright (C) 2009 Eric Schulte

;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; Version: 0.01

;;; License:

;; This program 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, or (at your option)
;; any later version.
;;
;; This program 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; Org-Babel support for evaluating emacs-lisp code

;;; Code:
(require 'org-babel)

(org-babel-add-interpreter "emacs-lisp")

(add-to-list 'org-babel-tangle-langs '("emacs-lisp" "el"))

(defvar org-babel-default-header-args:emacs-lisp
  '((:hlines . "yes") (:colnames . "no"))
  "Default arguments to use when evaluating an emacs-lisp source block.")

(defun org-babel-expand-body:emacs-lisp (body params &optional processed-params)
  (let* ((processed-params (or processed-params (org-babel-process-params params)))
         (vars (second processed-params))
         (processed-params (org-babel-process-params params))
         (result-params (third processed-params))
         (print-level nil) (print-length nil)
         (body (concat "(let ("
                       (mapconcat
                        (lambda (var) (format "%S" (print `(,(car var) ',(cdr var)))))
                        vars "\n      ")
                       ")\n"
                       (if (or (member "code" result-params)
                               (member "pp" result-params))
                           (concat "(pp " body ")") body) ")")))
    body))

(defun org-babel-execute:emacs-lisp (body params)
  "Execute a block of emacs-lisp code with org-babel."
  (message "executing emacs-lisp code block...")
  (save-window-excursion
    (let ((processed-params (org-babel-process-params params)))
      (org-babel-reassemble-table
       (eval (read (org-babel-expand-body:emacs-lisp body params)))
       (org-babel-pick-name (nth 4 processed-params) (cdr (assoc :colnames params)))
       (org-babel-pick-name (nth 5 processed-params) (cdr (assoc :rownames params)))))))

(provide 'org-babel-emacs-lisp)
;;; org-babel-emacs-lisp.el ends here