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+;;; ob-scheme.el --- org-babel functions for Scheme
+
+;; Copyright (C) 2010 Free Software Foundation
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research, scheme
+;; Homepage: http://orgmode.org
+;; Version: 7.4
+
+;;; 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:
+
+;; Now working with SBCL for both session and external evaluation.
+;;
+;; This certainly isn't optimally robust, but it seems to be working
+;; for the basic use cases.
+
+;;; Requirements:
+
+;; - a working scheme implementation
+;;   (e.g. guile http://www.gnu.org/software/guile/guile.html)
+;;   
+;; - for session based evaluation cmuscheme.el is required which is
+;;   included in Emacs
+
+;;; Code:
+(require 'ob)
+(require 'ob-ref)
+(require 'ob-comint)
+(require 'ob-eval)
+(eval-when-compile (require 'cl))
+
+(declare-function run-scheme "ext:cmuscheme" (cmd))
+
+(defvar org-babel-default-header-args:scheme '()
+  "Default header arguments for scheme code blocks.")
+
+(defvar org-babel-scheme-eoe "org-babel-scheme-eoe"
+  "String to indicate that evaluation has completed.")
+
+(defcustom org-babel-scheme-cmd "guile"
+  "Name of command used to evaluate scheme blocks."
+  :group 'org-babel
+  :type 'string)
+
+(defun org-babel-expand-body:scheme (body params)
+  "Expand BODY according to PARAMS, return the expanded body."
+  (let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
+    (if (> (length vars) 0)
+        (concat "(let ("
+                (mapconcat
+                 (lambda (var) (format "%S" (print `(,(car var) ',(cdr var)))))
+                 vars "\n      ")
+                ")\n" body ")")
+      body)))
+
+(defvar scheme-program-name)
+(defun org-babel-execute:scheme (body params)
+  "Execute a block of Scheme code with org-babel.
+This function is called by `org-babel-execute-src-block'"
+  (let* ((result-type (cdr (assoc :result-type params)))
+	 (org-babel-scheme-cmd (or (cdr (assoc :scheme params))
+				   org-babel-scheme-cmd))
+         (full-body (org-babel-expand-body:scheme body params)))
+    (read
+     (if (not (string= (cdr (assoc :session params)) "none"))
+         ;; session evaluation
+	 (let ((session (org-babel-prep-session:scheme
+			 (cdr (assoc :session params)) params)))
+	   (org-babel-comint-with-output
+	       (session (format "%S" org-babel-scheme-eoe) t body)
+	     (mapc
+	      (lambda (line)
+		(insert (org-babel-chomp line)) (comint-send-input nil t))
+	      (list body (format "%S" org-babel-scheme-eoe)))))
+       ;; external evaluation
+       (let ((script-file (org-babel-temp-file "scheme-script-")))
+         (with-temp-file script-file
+           (insert
+            ;; return the value or the output
+            (if (string= result-type "value")
+                (format "(display %s)" full-body)
+              full-body)))
+         (org-babel-eval
+	  (format "%s %s" org-babel-scheme-cmd
+		  (org-babel-process-file-name script-file)) ""))))))
+
+(defun org-babel-prep-session:scheme (session params)
+  "Prepare SESSION according to the header arguments specified in PARAMS."
+  (let* ((session (org-babel-scheme-initiate-session session))
+	 (vars (mapcar #'cdr (org-babel-get-header params :var)))
+	 (var-lines
+	  (mapcar
+	   (lambda (var) (format "%S" (print `(define ,(car var) ',(cdr var)))))
+	   vars)))
+    (when session
+      (org-babel-comint-in-buffer session
+	(sit-for .5) (goto-char (point-max))
+	(mapc (lambda (var)
+		(insert var) (comint-send-input nil t)
+		(org-babel-comint-wait-for-output session)
+		(sit-for .1) (goto-char (point-max))) var-lines)))
+    session))
+
+(defun org-babel-scheme-initiate-session (&optional session)
+  "If there is not a current inferior-process-buffer in SESSION
+then create.  Return the initialized session."
+  (require 'cmuscheme)
+  (unless (string= session "none")
+    (let ((session-buffer (save-window-excursion
+			    (run-scheme org-babel-scheme-cmd)
+			    (rename-buffer session)
+			    (current-buffer))))
+      (if (org-babel-comint-buffer-livep session-buffer)
+	  (progn (sit-for .25) session-buffer)
+        (sit-for .5)
+        (org-babel-scheme-initiate-session session)))))
+
+(provide 'ob-scheme)
+
+;; arch-tag: 6b2fe76f-4b25-4e87-ad1c-225b2f282a71
+
+;;; ob-scheme.el ends here