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+;; Lisp interface between GNU Emacs and MEDIT package. Emacs under MDL.
+;; Copyright (C) 1985 Free Software Foundation, Inc.
+;; Principal author K. Shane Hartman
+
+;; 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 1, 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; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+;; >> This package depends on two MDL packages: MEDIT and FORKS which
+;; >> can be obtained from the public (network) library at mit-ajax.
+
+(require 'mim-mode)
+
+(defconst medit-zap-file (concat "/tmp/" (user-login-name) ".medit.mud")
+  "File name for data sent to MDL by Medit.")
+(defconst medit-buffer "*MEDIT*"
+  "Name of buffer in which Medit accumulates data to send to MDL.")
+(defconst medit-save-files t
+  "If non-nil, Medit offers to save files on return to MDL.")
+  
+(defun medit-save-define ()
+  "Mark the previous or surrounding toplevel object to be sent back to MDL."
+  (interactive)
+  (save-excursion
+      (beginning-of-DEFINE)
+      (let ((start (point)))
+	(forward-mim-object 1)
+	(append-to-buffer medit-buffer start (point))
+	(goto-char start)
+	(message (buffer-substring start (progn (end-of-line) (point)))))))
+
+(defun medit-save-region (start end)
+  "Mark the current region to be sent to back to MDL."
+  (interactive "r")
+  (append-to-buffer medit-buffer start end)
+  (message "Current region saved for MDL."))
+
+(defun medit-save-buffer ()
+  "Mark the current buffer to be sent back to MDL."
+  (interactive)
+  (append-to-buffer medit-buffer (point-min) (point-max))
+  (message "Current buffer saved for MDL."))
+
+(defun medit-zap-define-to-mdl ()
+  "Return to MDL with surrounding or previous toplevel MDL object."
+  (indetarctive)
+  (medit-save-defun)
+  (medit-go-to-mdl))
+
+(defun medit-zap-region-mdl (start end)
+  "Return to MDL with current region."
+  (interactive)
+  (medit-save-region start end)
+  (medit-go-to-mdl))
+
+(defun medit-zap-buffer ()
+  "Return to MDL with current buffer."
+  (interactive)
+  (medit-save-buffer)
+  (medit-go-to-mdl))
+
+(defun medit-goto-mdl ()
+  "Return from Emacs to superior MDL, sending saved code.
+Optionally, offers to save changed files."
+  (interactive)
+  (let ((buffer (get-buffer medit-buffer)))
+  (if buffer
+      (save-excursion
+	(set-buffer buffer)
+	(if (buffer-modified-p buffer)
+	    (write-region (point-min) (point-max) medit-zap-file))
+	(set-buffer-modified-p nil)
+	(erase-buffer)))
+  (if medit-save-files (save-some-buffers))
+  ;; Note could handle parallel fork by giving argument "%xmdl".  Then
+  ;; mdl would have to invoke with "%emacs".
+  (suspend-emacs)))
+
+(defconst medit-mode-map nil)
+(if (not medit-mode-map)
+    (progn
+      (setq medit-mode-map (copy-keymap mim-mode-map))
+      (define-key medit-mode-map "\e\z" 'medit-save-define)
+      (define-key medit-mode-map "\e\^z" 'medit-save-buffer)
+      (define-key medit-mode-map "\^xz" 'medit-goto-mdl)
+      (define-key medit-mode-map "\^xs" 'medit-zap-buffer)))
+
+(defconst medit-mode-hook (and (boundp 'mim-mode-hook) mim-mode-hook) "")
+(setq mim-mode-hook '(lambda () (medit-mode)))
+	 
+(defun medit-mode (&optional state)
+  "Major mode for editing text and returning it to a superior MDL.
+Like Mim mode, plus these special commands:
+\\{medit-mode-map}"
+  (interactive)
+  (use-local-map medit-mode-map)
+  (run-hooks 'medit-mode-hook)
+  (setq major-mode 'medit-mode)
+  (setq mode-name "Medit"))
+
+(mim-mode)
+
+