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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. In other Emacs versions they may be used
as a variable to hold the menu data, and a doc string for that variable.
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 usually a vector of three elements: [NAME CALLBACK t]
NAME is a string--the menu item name.
CALLBACK is a command to run when the item is chosen,
or a list to evaluate when the item is chosen.
A menu item can be a string. Then that string appears in the menu as
unselectable text. A string consisting solely of hyphens is displayed
as a solid horizontal line.
A menu item can be 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."
(or (keymapp maps) (setq maps (list maps)))
(let ((keymap (easy-menu-keymap (car menu) (cdr menu))))
(while maps
(define-key (car maps) (vector 'menu-bar (intern (car menu)))
(cons (car menu) keymap))
(setq maps (cdr maps)))))
(defvar easy-menu-item-count 0)
;; 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 (easy-menu-keymap (car item) (cdr item)))
(setq name (car item)))
((vectorp item)
(setq command (make-symbol (format "menu-function-%d"
easy-menu-item-count)))
(setq enabler (make-symbol (format "menu-function-%d-enabler"
easy-menu-item-count)))
(setq easy-menu-item-count (1+ easy-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
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