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+;;; ob-acl2.el --- org-babel functions for ACL2
+
+;; Copyright (C) Masaya Tojo <masaya@tojo.tokyo>
+
+;; Author: Masaya Tojo
+;; Keywords: literate programming, reproducible research
+;; Homepage: https://git.tojo.tokyo/ob-acl2.git
+;; 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.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This is implemented by pouring expressions into a *shell* buffer, which is a standard ACL2 execution environment. Please run acl2 with *shell* before using it.
+
+
+;;; Code:
+(require 'ob)
+
+(defun org-babel-acl2-clean-prompt (string)
+  (string-join (butlast (split-string string "\n")) "\n"))
+
+(defun org-babel-execute:acl2 (body params)
+  (let ((full-body (org-babel-expand-body:generic body params))
+        ;;; XXX: I'm using *shell* for now.
+	(session (get-buffer "*shell*"))
+	(pt (lambda ()
+	      (marker-position
+	       (process-mark (get-buffer-process (current-buffer)))))))
+    (org-babel-acl2-clean-prompt
+     (org-babel-comint-in-buffer session
+       (let ((start (funcall pt)))
+	 (with-temp-buffer
+	   (insert full-body)
+	   (comint-send-region session (point-min) (point-max))
+           (comint-send-string session "\n"))
+	 (while (equal start (funcall pt)) (sleep-for 0.1))
+	 (buffer-substring start (funcall pt)))))))
+
+(provide 'ob-acl2)
+
+;;; ob-acl2.el ends here