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+;; Copyright (C) 1986 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.
+
+
+(defmacro caar (conscell)
+  (list 'car (list 'car conscell)))
+
+(defmacro cdar (conscell)
+  (list 'cdr (list 'car conscell)))
+
+(defun x-menu-mode ()
+  "Major mode for creating permanent menus for use with X.
+These menus are implemented entirely in Lisp; popup menus, implemented
+with x-popup-menu, are implemented using XMenu primitives."
+  (make-local-variable 'x-menu-items-per-line)
+  (make-local-variable 'x-menu-item-width)
+  (make-local-variable 'x-menu-items-alist)
+  (make-local-variable 'x-process-mouse-hook)
+  (make-local-variable 'x-menu-assoc-buffer)
+  (setq buffer-read-only t)
+  (setq truncate-lines t)
+  (setq x-process-mouse-hook 'x-menu-pick-entry)
+  (setq mode-line-buffer-identification '("MENU: %32b")))
+
+(defvar x-menu-max-width 0)
+(defvar x-menu-items-per-line 0)
+(defvar x-menu-item-width 0)
+(defvar x-menu-items-alist nil)
+(defvar x-menu-assoc-buffer nil)
+
+(defvar x-menu-item-spacing 1
+  "*Minimum horizontal spacing between objects in a permanent X menu.")
+
+(defun x-menu-create-menu (name)
+  "Create a permanent X menu.  Returns an item which should be used as a
+menu object whenever referring to the menu."
+  (let ((old (current-buffer))
+	(buf (get-buffer-create name)))
+    (set-buffer buf)
+    (x-menu-mode)
+    (setq x-menu-assoc-buffer old)
+    (set-buffer old)
+    buf))
+
+(defun x-menu-change-associated-buffer (menu buffer)
+  "Change associated buffer of MENU to BUFFER.  BUFFER should be a buffer
+object."
+  (let ((old (current-buffer)))
+    (set-buffer menu)
+    (setq x-menu-assoc-buffer buffer)
+    (set-buffer old)))
+
+(defun x-menu-add-item (menu item binding)
+  "Adds to MENU an item with name ITEM, associated with BINDING.
+Following a sequence of calls to x-menu-add-item, a call to x-menu-compute
+should be performed before the menu will be made available to the user.
+
+BINDING should be a function of one argument, which is the numerical
+button/key code as defined in x-menu.el."
+  (let ((old (current-buffer))
+	elt)
+    (set-buffer menu)
+    (if (setq elt (assoc item x-menu-items-alist))
+	(rplacd elt binding)
+      (setq x-menu-items-alist (append x-menu-items-alist
+				       (list (cons item binding)))))
+    (set-buffer old)
+    item))
+
+(defun x-menu-delete-item (menu item)
+  "Deletes from MENU the item named ITEM.  x-menu-compute should be called
+before the menu is made available to the user."
+  (let ((old (current-buffer))
+	elt)
+    (set-buffer menu)
+    (if (setq elt (assoc item x-menu-items-alist))
+	(rplaca elt nil))
+    (set-buffer old)
+    item))
+
+(defun x-menu-activate (menu)
+  "Computes all necessary parameters for MENU.  This must be called whenever
+a menu is modified before it is made available to the user.
+
+This also creates the menu itself."
+  (let ((buf (current-buffer)))
+    (pop-to-buffer menu)
+    (let (buffer-read-only)
+      (setq x-menu-max-width (1- (screen-width)))
+      (setq x-menu-item-width 0)
+      (let (items-head
+	    (items-tail x-menu-items-alist))
+	(while items-tail
+	  (if (caar items-tail)
+	      (progn (setq items-head (cons (car items-tail) items-head))
+		     (setq x-menu-item-width
+			   (max x-menu-item-width
+				(length (caar items-tail))))))
+	  (setq items-tail (cdr items-tail)))
+	(setq x-menu-items-alist (reverse items-head)))
+      (setq x-menu-item-width (+ x-menu-item-spacing x-menu-item-width))
+      (setq x-menu-items-per-line
+	    (max 1 (/ x-menu-max-width x-menu-item-width)))
+      (erase-buffer)
+      (let ((items-head x-menu-items-alist))
+	(while items-head
+	  (let ((items 0))
+	    (while (and items-head
+			(<= (setq items (1+ items)) x-menu-items-per-line))
+	      (insert (format (concat "%"
+				      (int-to-string x-menu-item-width) "s")
+			      (caar items-head)))
+	      (setq items-head (cdr items-head))))
+	  (insert ?\n)))
+      (shrink-window (max 0
+			  (- (window-height)
+			     (1+ (count-lines (point-min) (point-max))))))
+      (goto-char (point-min)))
+    (pop-to-buffer buf)))
+
+(defun x-menu-pick-entry (position event)
+  "Internal function for dispatching on mouse/menu events"
+  (let*	((x (min (1- x-menu-items-per-line)
+		 (/ (current-column) x-menu-item-width)))
+	 (y (- (count-lines (point-min) (point))
+	       (if (zerop (current-column)) 0 1)))
+	 (item (+ x (* y x-menu-items-per-line)))
+	 (litem (cdr (nth item x-menu-items-alist))))
+    (and litem (funcall litem event)))
+  (pop-to-buffer x-menu-assoc-buffer))