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lisp/emacs-lisp/easymenu.el

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+;;; easymenu.el --- support the easymenu interface for defining a menu.
+
+;; Keywords: emulations
+
+;; Copyright (C) 1994 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 2, 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 is compatible with easymenu.el by Per Abrahamsen
+;;; but it is much simpler as it doesn't try to support other Emacs versions.
+;;; The code was mostly derived from lmenu.el.
+
+;;; Code:
+
+;;;###autoload.
+(defun easy-menu-define (symbol maps doc menu)
+  "Define a menu bar submenu in maps MAPS, according to MENU.
+The arguments SYMBOL and DOC are ignored; they are present for
+compatibility only.
+
+The first element of MENU must be a string.  It is the menu bar item name.
+The rest of the elements are menu items.
+
+A menu item is a vector of three elements:
+
+ - the name of the menu item (a string);
+ - the `callback' of that item;
+ - t.
+
+If the `callback' of a menu item is a symbol, then it must name a
+command.  It will be invoked with `call-interactively'.  If it is a
+list, then it is evaluated with `eval'.
+
+If an element of a menu is a string, then that string appears in the
+menu as unselectable text.
+
+If an element of a menu is a string consisting solely of hyphens, then that
+item is displayed as a solid horizontal line.
+
+If an element of a menu is a list, it is treated as a submenu.
+The first element should be the submenu name.  That's used as the
+menu item in the top-level menu.  The cdr of the submenu list
+is a list of menu items, as above."
+  (let ((keymap (easy-menu-keymap (car menu) (cdr menu))))
+    (mapcar (function (lambda (map) 
+	      (define-key map (vector 'menu-bar (intern (car menu)))
+		(cons (car menu) keymap))))
+	    (if (keymapp maps) (list maps) maps))))
+
+;; Return a menu keymap corresponding to a Lucid-style menu list
+;; MENU-ITEMS, and with name MENU-NAME.
+(defun easy-menu-keymap (menu-name menu-items)
+  (let ((menu (make-sparse-keymap menu-name)))
+    ;; Process items in reverse order,
+    ;; since the define-key loop reverses them again.
+    (setq menu-items (reverse menu-items))
+    (while menu-items
+      (let* ((item (car menu-items))
+	     (callback (if (vectorp item) (aref item 1)))
+	     command enabler name)
+	(cond ((stringp item)
+	       (setq command nil)
+	       (setq name (if (string-match "^-+$" item) "" item)))
+	      ((consp item)
+	       (setq command (make-lucid-menu-keymap (car item) (cdr item)))
+	       (setq name (car item)))
+	      ((vectorp item)
+	       (setq command (make-symbol (format "menu-function-%d"
+						  add-menu-item-count)))
+	       (setq enabler (make-symbol (format "menu-function-%d-enabler"
+						  add-menu-item-count)))
+	       (setq add-menu-item-count (1+ add-menu-item-count))
+	       (put command 'menu-enable enabler)
+	       (set enabler (aref item 2))
+	       (setq name (aref item 0))	       
+	       (if (symbolp callback)
+		   (fset command callback)
+		 (fset command (list 'lambda () '(interactive) callback)))))
+	(if (null command)
+	    ;; Handle inactive strings specially--allow any number
+	    ;; of identical ones.
+	    (setcdr menu (cons (list nil name) (cdr menu)))
+	  (if name 
+	      (define-key menu (vector (intern name)) (cons name command)))))
+      (setq menu-items (cdr menu-items)))
+    menu))
+
+(provide 'easymenu)
+
+;;; easymenu.el ends here