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+;;; ob-scheme.el --- org-babel functions for Scheme
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+
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+;; Copyright (C) 2010 Free Software Foundation
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+
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+;; Author: Eric Schulte
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+;; Keywords: literate programming, reproducible research, scheme
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+;; Homepage: http://orgmode.org
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+;; Version: 0.01
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+
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+;;; License:
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+
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+;; This program is free software; you can redistribute it and/or modify
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+;; it under the terms of the GNU General Public License as published by
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+;; the Free Software Foundation; either version 3, or (at your option)
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+;; any later version.
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+;;
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+;; This program is distributed in the hope that it will be useful,
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+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+;; GNU General Public License for more details.
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+;;
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+;; You should have received a copy of the GNU General Public License
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+;; along with GNU Emacs; see the file COPYING. If not, write to the
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+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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+;; Boston, MA 02110-1301, USA.
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+
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+;;; Commentary:
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+
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+;; Now working with SBCL for both session and external evaluation.
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+;;
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+;; This certainly isn't optimally robust, but it seems to be working
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+;; for the basic use cases.
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+
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+;;; Requirements:
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+
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+;; - a working scheme implementation
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+;; (e.g. guile http://www.gnu.org/software/guile/guile.html)
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+
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+;;; Code:
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+(require 'ob)
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+(require 'ob-eval)
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+
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+(defvar org-babel-default-header-args:scheme '()
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+ "Default header arguments for scheme code blocks.")
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+
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+(defcustom org-babel-scheme-cmd "guile"
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+ "Name of command used to evaluate scheme blocks."
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+ :group 'org-babel
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+ :type 'string)
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+
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+(defun org-babel-expand-body:scheme (body params &optional processed-params)
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+ "Expand BODY according to PARAMS, return the expanded body."
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+ (let ((vars (nth 1 (or processed-params (org-babel-process-params params)))))
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+ (if (> (length vars) 0)
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+ (concat "(let ("
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+ (mapconcat
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+ (lambda (var) (format "%S" (print `(,(car var) ',(cdr var)))))
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+ vars "\n ")
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+ ")\n" body ")")
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+ body)))
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+
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+(defun org-babel-execute:scheme (body params)
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+ "Execute a block of Scheme code with org-babel.
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+This function is called by `org-babel-execute-src-block'"
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+ (let* ((processed-params (org-babel-process-params params))
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+ (session (not (string= (nth 0 processed-params) "none")))
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+ (result-type (nth 3 processed-params))
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+ (full-body (org-babel-expand-body:scheme body params processed-params)))
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+ (read
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+ (if session
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+ ;; session evaluation
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+ (error "Scheme sessions are not yet supported.")
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+ ;; external evaluation
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+ (let ((script-file (org-babel-temp-file "lisp-script-")))
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+ (with-temp-file script-file
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+ (insert
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+ ;; return the value or the output
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+ (if (string= result-type "value")
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+ (format "(display %s)" full-body)
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+ full-body)))
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+ (org-babel-eval
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+ (format "%s %s" org-babel-scheme-cmd script-file) ""))))))
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+
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+(defun org-babel-prep-session:scheme (session params)
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+ "Prepare SESSION according to the header arguments specified in PARAMS."
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+ (error "not yet implemented"))
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+
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+(defun org-babel-scheme-initiate-session (&optional session)
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+ "If there is not a current inferior-process-buffer in SESSION
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+then create. Return the initialized session."
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+ (error "Scheme sessions are not yet supported."))
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+
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+(provide 'ob-scheme)
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+
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+;; arch-tag: 6b2fe76f-4b25-4e87-ad1c-225b2f282a71
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+
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+;;; ob-scheme.el ends here
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Eric Schulte