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+;; Emacs side of ledit interface
+;; Copyright (C) 1985 Free Software Foundation, Inc.
+
+;; 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.
+
+
+;;; To do:
+;;; o lisp -> emacs side of things (grind-definition and find-definition)
+
+(defvar ledit-mode-map nil)
+
+(defconst ledit-zap-file (concat "/tmp/" (user-login-name) ".l1")
+  "File name for data sent to Lisp by Ledit.")
+(defconst ledit-read-file (concat "/tmp/" (user-login-name) ".l2")
+  "File name for data sent to Ledit by Lisp.")
+(defconst ledit-compile-file 
+  (concat "/tmp/" (user-login-name) ".l4")
+  "File name for data sent to Lisp compiler by Ledit.")
+(defconst ledit-buffer "*LEDIT*"
+  "Name of buffer in which Ledit accumulates data to send to Lisp.")
+;These are now in loaddefs.el
+;(defconst ledit-save-files t
+;  "*Non-nil means Ledit should save files before transferring to Lisp.")
+;(defconst ledit-go-to-lisp-string "%?lisp"
+;  "*Shell commands to execute to resume Lisp job.")
+;(defconst ledit-go-to-liszt-string "%?liszt"
+;  "*Shell commands to execute to resume Lisp compiler job.")
+
+(defun ledit-save-defun ()
+  "Save the current defun in the ledit buffer"
+  (interactive)
+  (save-excursion
+   (end-of-defun)
+   (let ((end (point)))
+     (beginning-of-defun)
+     (append-to-buffer ledit-buffer (point) end))
+   (message "Current defun saved for Lisp")))
+
+(defun ledit-save-region (beg end)
+  "Save the current region in the ledit buffer"
+  (interactive "r")
+  (append-to-buffer ledit-buffer beg end)
+  (message "Region saved for Lisp"))
+
+(defun ledit-zap-defun-to-lisp ()
+  "Carry the current defun to lisp"
+  (interactive)
+  (ledit-save-defun)
+  (ledit-go-to-lisp))
+
+(defun ledit-zap-defun-to-liszt ()
+  "Carry the current defun to liszt"
+  (interactive)
+  (ledit-save-defun)
+  (ledit-go-to-liszt))
+
+(defun ledit-zap-region-to-lisp (beg end)
+  "Carry the current region to lisp"
+  (interactive "r")
+  (ledit-save-region beg end)
+  (ledit-go-to-lisp))
+
+(defun ledit-go-to-lisp ()
+  "Suspend Emacs and restart a waiting Lisp job."
+  (interactive)
+  (if ledit-save-files
+      (save-some-buffers))
+  (if (get-buffer ledit-buffer)
+      (save-excursion
+       (set-buffer ledit-buffer)
+       (goto-char (point-min))
+       (write-region (point-min) (point-max) ledit-zap-file)
+       (erase-buffer)))
+  (suspend-emacs ledit-go-to-lisp-string)
+  (load ledit-read-file t t))
+
+(defun ledit-go-to-liszt ()
+  "Suspend Emacs and restart a waiting Liszt job."
+  (interactive)
+  (if ledit-save-files
+      (save-some-buffers))
+  (if (get-buffer ledit-buffer)
+      (save-excursion
+       (set-buffer ledit-buffer)
+       (goto-char (point-min))
+       (insert "(declare (macros t))\n")
+       (write-region (point-min) (point-max) ledit-compile-file)
+       (erase-buffer)))
+  (suspend-emacs ledit-go-to-liszt-string)
+  (load ledit-read-file t t))
+
+(defun ledit-setup ()
+  "Set up key bindings for the Lisp / Emacs interface"
+  (if (not ledit-mode-map)
+      (progn (setq ledit-mode-map (make-sparse-keymap))
+	     (lisp-mode-commands ledit-mode-map)))
+  (define-key ledit-mode-map "\e\^d" 'ledit-save-defun)
+  (define-key ledit-mode-map "\e\^r" 'ledit-save-region)
+  (define-key ledit-mode-map "\^xz" 'ledit-go-to-lisp)
+  (define-key ledit-mode-map "\e\^c" 'ledit-go-to-liszt))
+
+(ledit-setup)
+
+(defun ledit-mode ()
+  "Major mode for editing text and stuffing it to a Lisp job.
+Like Lisp mode, plus these special commands:
+  M-C-d	-- record defun at or after point
+	   for later transmission to Lisp job.
+  M-C-r -- record region for later transmission to Lisp job.
+  C-x z -- transfer to Lisp job and transmit saved text.
+  M-C-c -- transfer to Liszt (Lisp compiler) job
+	   and transmit saved text.
+\\{ledit-mode-map}
+To make Lisp mode automatically change to Ledit mode,
+do (setq lisp-mode-hook 'ledit-from-lisp-mode)"
+  (interactive)
+  (lisp-mode)
+  (ledit-from-lisp-mode))
+
+(defun ledit-from-lisp-mode ()
+  (use-local-map ledit-mode-map)
+  (setq mode-name "Ledit")
+  (setq major-mode 'ledit-mode)
+  (run-hooks 'ledit-mode-hook))