lisp/emacs-lisp/lmenu.el

   1 ;;; lmenu.el --- emulate Lucid's menubar support
   2
   3 ;; Copyright (C) 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
   4
   5 ;; Keywords: emulations obsolete
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 2, or (at your option)
  12 ;; any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 ;; Boston, MA 02111-1307, USA.
  23
  24 ;;; Code:
  25
  26 \f
  27 ;; First, emulate the Lucid menubar support in GNU Emacs 19.
  28
  29 ;; Arrange to use current-menubar to set up part of the menu bar.
  30
  31 (defvar current-menubar)
  32
  33 (setq recompute-lucid-menubar 'recompute-lucid-menubar)
  34 (defun recompute-lucid-menubar ()
  35   (define-key lucid-menubar-map [menu-bar]
  36     (condition-case nil
  37         (make-lucid-menu-keymap "menu-bar" current-menubar)
  38       (error (message "Invalid data in current-menubar moved to lucid-failing-menubar")
  39              (sit-for 1)
  40              (setq lucid-failing-menubar current-menubar
  41                    current-menubar nil))))
  42   (setq lucid-menu-bar-dirty-flag nil))
  43
  44 (defvar lucid-menubar-map (make-sparse-keymap))
  45 (or (assq 'current-menubar minor-mode-map-alist)
  46     (setq minor-mode-map-alist
  47           (cons (cons 'current-menubar lucid-menubar-map)
  48                 minor-mode-map-alist)))
  49
  50 ;; XEmacs compatibility
  51 (defun set-menubar-dirty-flag ()
  52   (force-mode-line-update)
  53   (setq lucid-menu-bar-dirty-flag t))
  54
  55 (defvar add-menu-item-count 0)
  56
  57 ;; This is a variable whose value is always nil.
  58 (defvar make-lucid-menu-keymap-disable nil)
  59
  60 ;; Return a menu keymap corresponding to a Lucid-style menu list
  61 ;; MENU-ITEMS, and with name MENU-NAME.
  62 (defun make-lucid-menu-keymap (menu-name menu-items)
  63   (let ((menu (make-sparse-keymap menu-name)))
  64     ;; Process items in reverse order,
  65     ;; since the define-key loop reverses them again.
  66     (setq menu-items (reverse menu-items))
  67     (while menu-items
  68       (let ((item (car menu-items))
  69             command name callback)
  70         (cond ((stringp item)
  71                (setq command nil)
  72                (setq name (if (string-match "^-+$" item) "" item)))
  73               ((consp item)
  74                (setq command (make-lucid-menu-keymap (car item) (cdr item)))
  75                (setq name (car item)))
  76               ((vectorp item)
  77                (setq command (make-symbol (format "menu-function-%d"
  78                                                   add-menu-item-count))
  79                      add-menu-item-count (1+ add-menu-item-count)
  80                      name (aref item 0)
  81                      callback (aref item 1))
  82                (if (symbolp callback)
  83                    (fset command callback)
  84                  (fset command (list 'lambda () '(interactive) callback)))
  85                (put command 'menu-alias t)
  86                (let ((i 2))
  87                  (while (< i (length item))
  88                    (cond
  89                     ((eq (aref item i) ':active)
  90                      (put command 'menu-enable
  91                           (or (aref item (1+ i))
  92                               'make-lucid-menu-keymap-disable))
  93                      (setq i (+ 2 i)))
  94                     ((eq (aref item i) ':suffix)
  95                      ;; unimplemented
  96                      (setq i (+ 2 i)))
  97                     ((eq (aref item i) ':keys)
  98                      ;; unimplemented
  99                      (setq i (+ 2 i)))
 100                     ((eq (aref item i) ':style)
 101                      ;; unimplemented
 102                      (setq i (+ 2 i)))
 103                     ((eq (aref item i) ':selected)
 104                      ;; unimplemented
 105                      (setq i (+ 2 i)))
 106                     ((and (symbolp (aref item i))
 107                           (= ?: (string-to-char (symbol-name (aref item i)))))
 108                      (error "Unrecognized menu item keyword: %S"
 109                             (aref item i)))
 110                     ((= i 2)
 111                      ;; old-style format: active-p &optional suffix
 112                      (put command 'menu-enable
 113                           (or (aref item i) 'make-lucid-menu-keymap-disable))
 114                      ;; suffix is unimplemented
 115                      (setq i (length item)))
 116                     (t
 117                      (error "Unexpected menu item value: %S"
 118                             (aref item i))))))))
 119         (if (null command)
 120             ;; Handle inactive strings specially--allow any number
 121             ;; of identical ones.
 122             (setcdr menu (cons (list nil name) (cdr menu)))
 123           (if name
 124               (define-key menu (vector (intern name)) (cons name command)))))
 125       (setq menu-items (cdr menu-items)))
 126     menu))
 127
 128 ;; XEmacs compatibility function
 129 (defun popup-dialog-box (data)
 130   "Pop up a dialog box.
 131 A dialog box description is a list.
 132
 133  - The first element of the list is a string to display in the dialog box.
 134  - The rest of the elements are descriptions of the dialog box's buttons.
 135    Each one is a vector of three elements:
 136    - The first element is the text of the button.
 137    - The second element is the `callback'.
 138    - The third element is t or nil, whether this button is selectable.
 139
 140 If the `callback' of a button is a symbol, then it must name a command.
 141 It will be invoked with `call-interactively'.  If it is a list, then it is
 142 evaluated with `eval'.
 143
 144 One (and only one) of the buttons may be `nil'.  This marker means that all
 145 following buttons should be flushright instead of flushleft.
 146
 147 The syntax, more precisely:
 148
 149    form         :=  <something to pass to `eval'>
 150    command      :=  <a symbol or string, to pass to `call-interactively'>
 151    callback     :=  command | form
 152    active-p     :=  <t, nil, or a form to evaluate to decide whether this
 153                     button should be selectable>
 154    name         :=  <string>
 155    partition    :=  'nil'
 156    button       :=  '['  name callback active-p ']'
 157    dialog       :=  '(' name [ button ]+ [ partition [ button ]+ ] ')'"
 158   (let ((name (car data))
 159         (tail (cdr data))
 160         converted
 161         choice meaning)
 162     (while tail
 163       (if (null (car tail))
 164           (setq converted (cons nil converted))
 165         (let ((item (aref (car tail) 0))
 166               (callback (aref (car tail) 1))
 167               (enable (aref (car tail) 2)))
 168           (setq converted
 169                 (cons (if enable (cons item callback) item)
 170                       converted))))
 171       (setq tail (cdr tail)))
 172     (setq choice (x-popup-dialog t (cons name (nreverse converted))))
 173     (if choice
 174         (if (symbolp choice)
 175             (call-interactively choice)
 176           (eval choice)))))
 177 \f
 178 ;; This is empty because the usual elements of the menu bar
 179 ;; are provided by menu-bar.el instead.
 180 ;; It would not make sense to duplicate them here.
 181 (defconst default-menubar nil)
 182
 183 ;; XEmacs compatibility
 184 (defun set-menubar (menubar)
 185   "Set the default menubar to be menubar."
 186   (setq-default current-menubar (copy-sequence menubar))
 187   (set-menubar-dirty-flag))
 188
 189 ;; XEmacs compatibility
 190 (defun set-buffer-menubar (menubar)
 191   "Set the buffer-local menubar to be menubar."
 192   (make-local-variable 'current-menubar)
 193   (setq current-menubar (copy-sequence menubar))
 194   (set-menubar-dirty-flag))
 195
 196 \f
 197 ;;; menu manipulation functions
 198
 199 ;; XEmacs compatibility
 200 (defun find-menu-item (menubar item-path-list &optional parent)
 201   "Searches MENUBAR for item given by ITEM-PATH-LIST.
 202 Returns (ITEM . PARENT), where PARENT is the immediate parent of
 203  the item found.
 204 Signals an error if the item is not found."
 205   (or parent (setq item-path-list (mapcar 'downcase item-path-list)))
 206   (if (not (consp menubar))
 207       nil
 208     (let ((rest menubar)
 209           result)
 210       (while rest
 211         (if (and (car rest)
 212                  (equal (car item-path-list)
 213                         (downcase (if (vectorp (car rest))
 214                                       (aref (car rest) 0)
 215                                     (if (stringp (car rest))
 216                                         (car rest)
 217                                       (car (car rest)))))))
 218             (setq result (car rest) rest nil)
 219           (setq rest (cdr rest))))
 220       (if (cdr item-path-list)
 221           (if (consp result)
 222               (find-menu-item (cdr result) (cdr item-path-list) result)
 223             (if result
 224                 (signal 'error (list "not a submenu" result))
 225               (signal 'error (list "no such submenu" (car item-path-list)))))
 226         (cons result parent)))))
 227
 228
 229 ;; XEmacs compatibility
 230 (defun disable-menu-item (path)
 231   "Make the named menu item be unselectable.
 232 PATH is a list of strings which identify the position of the menu item in
 233 the menu hierarchy.  (\"File\" \"Save\") means the menu item called \"Save\"
 234 under the toplevel \"File\" menu.  (\"Menu\" \"Foo\" \"Item\") means the
 235 menu item called \"Item\" under the \"Foo\" submenu of \"Menu\"."
 236   (let* ((menubar current-menubar)
 237          (pair (find-menu-item menubar path))
 238          (item (car pair))
 239          (menu (cdr pair)))
 240     (or item
 241         (signal 'error (list (if menu "No such menu item" "No such menu")
 242                              path)))
 243     (if (consp item) (error "can't disable menus, only menu items"))
 244     (aset item 2 nil)
 245     (set-menubar-dirty-flag)
 246     item))
 247
 248
 249 ;; XEmacs compatibility
 250 (defun enable-menu-item (path)
 251   "Make the named menu item be selectable.
 252 PATH is a list of strings which identify the position of the menu item in
 253 the menu hierarchy.  (\"File\" \"Save\") means the menu item called \"Save\"
 254 under the toplevel \"File\" menu.  (\"Menu\" \"Foo\" \"Item\") means the
 255 menu item called \"Item\" under the \"Foo\" submenu of \"Menu\"."
 256   (let* ((menubar current-menubar)
 257          (pair (find-menu-item menubar path))
 258          (item (car pair))
 259          (menu (cdr pair)))
 260     (or item
 261         (signal 'error (list (if menu "No such menu item" "No such menu")
 262                              path)))
 263     (if (consp item) (error "%S is a menu, not a menu item" path))
 264     (aset item 2 t)
 265     (set-menubar-dirty-flag)
 266     item))
 267
 268
 269 (defun add-menu-item-1 (item-p menu-path item-name item-data enabled-p before)
 270   (if before (setq before (downcase before)))
 271   (let* ((menubar current-menubar)
 272          (menu (condition-case ()
 273                    (car (find-menu-item menubar menu-path))
 274                  (error nil)))
 275          (item (if (listp menu)
 276                    (car (find-menu-item (cdr menu) (list item-name)))
 277                  (signal 'error (list "not a submenu" menu-path)))))
 278     (or menu
 279         (let ((rest menu-path)
 280               (so-far menubar))
 281           (while rest
 282 ;;;         (setq menu (car (find-menu-item (cdr so-far) (list (car rest)))))
 283             (setq menu
 284                   (if (eq so-far menubar)
 285                       (car (find-menu-item so-far (list (car rest))))
 286                     (car (find-menu-item (cdr so-far) (list (car rest))))))
 287             (or menu
 288                 (let ((rest2 so-far))
 289                   (or rest2
 290                       (error "Trying to modify a menu that doesn't exist"))
 291                   (while (and (cdr rest2) (car (cdr rest2)))
 292                     (setq rest2 (cdr rest2)))
 293                   (setcdr rest2
 294                           (nconc (list (setq menu (list (car rest))))
 295                                  (cdr rest2)))))
 296             (setq so-far menu)
 297             (setq rest (cdr rest)))))
 298     (or menu (setq menu menubar))
 299     (if item
 300         nil     ; it's already there
 301       (if item-p
 302           (setq item (vector item-name item-data enabled-p))
 303         (setq item (cons item-name item-data)))
 304       ;; if BEFORE is specified, try to add it there.
 305       (if before
 306           (setq before (car (find-menu-item menu (list before)))))
 307       (let ((rest menu)
 308             (added-before nil))
 309         (while rest
 310           (if (eq before (car (cdr rest)))
 311               (progn
 312                 (setcdr rest (cons item (cdr rest)))
 313                 (setq rest nil added-before t))
 314             (setq rest (cdr rest))))
 315         (if (not added-before)
 316             ;; adding before the first item on the menubar itself is harder
 317             (if (and (eq menu menubar) (eq before (car menu)))
 318                 (setq menu (cons item menu)
 319                       current-menubar menu)
 320               ;; otherwise, add the item to the end.
 321               (nconc menu (list item))))))
 322     (if item-p
 323         (progn
 324           (aset item 1 item-data)
 325           (aset item 2 (not (null enabled-p))))
 326       (setcar item item-name)
 327       (setcdr item item-data))
 328     (set-menubar-dirty-flag)
 329     item))
 330
 331 ;; XEmacs compatibility
 332 (defun add-menu-item (menu-path item-name function enabled-p &optional before)
 333   "Add a menu item to some menu, creating the menu first if necessary.
 334 If the named item exists already, it is changed.
 335 MENU-PATH identifies the menu under which the new menu item should be inserted.
 336  It is a list of strings; for example, (\"File\") names the top-level \"File\"
 337  menu.  (\"File\" \"Foo\") names a hypothetical submenu of \"File\".
 338 ITEM-NAME is the string naming the menu item to be added.
 339 FUNCTION is the command to invoke when this menu item is selected.
 340  If it is a symbol, then it is invoked with `call-interactively', in the same
 341  way that functions bound to keys are invoked.  If it is a list, then the
 342  list is simply evaluated.
 343 ENABLED-P controls whether the item is selectable or not.
 344 BEFORE, if provided, is the name of a menu item before which this item should
 345  be added, if this item is not on the menu already.  If the item is already
 346  present, it will not be moved."
 347   (or menu-path (error "must specify a menu path"))
 348   (or item-name (error "must specify an item name"))
 349   (add-menu-item-1 t menu-path item-name function enabled-p before))
 350
 351
 352 ;; XEmacs compatibility
 353 (defun delete-menu-item (path)
 354   "Remove the named menu item from the menu hierarchy.
 355 PATH is a list of strings which identify the position of the menu item in
 356 the menu hierarchy.  (\"File\" \"Save\") means the menu item called \"Save\"
 357 under the toplevel \"File\" menu.  (\"Menu\" \"Foo\" \"Item\") means the
 358 menu item called \"Item\" under the \"Foo\" submenu of \"Menu\"."
 359   (let* ((menubar current-menubar)
 360          (pair (find-menu-item menubar path))
 361          (item (car pair))
 362          (menu (or (cdr pair) menubar)))
 363     (if (not item)
 364         nil
 365       ;; the menubar is the only special case, because other menus begin
 366       ;; with their name.
 367       (if (eq menu current-menubar)
 368           (setq current-menubar (delq item menu))
 369         (delq item menu))
 370       (set-menubar-dirty-flag)
 371       item)))
 372
 373
 374 ;; XEmacs compatibility
 375 (defun relabel-menu-item (path new-name)
 376   "Change the string of the specified menu item.
 377 PATH is a list of strings which identify the position of the menu item in
 378 the menu hierarchy.  (\"File\" \"Save\") means the menu item called \"Save\"
 379 under the toplevel \"File\" menu.  (\"Menu\" \"Foo\" \"Item\") means the
 380 menu item called \"Item\" under the \"Foo\" submenu of \"Menu\".
 381 NEW-NAME is the string that the menu item will be printed as from now on."
 382   (or (stringp new-name)
 383       (setq new-name (signal 'wrong-type-argument (list 'stringp new-name))))
 384   (let* ((menubar current-menubar)
 385          (pair (find-menu-item menubar path))
 386          (item (car pair))
 387          (menu (cdr pair)))
 388     (or item
 389         (signal 'error (list (if menu "No such menu item" "No such menu")
 390                              path)))
 391     (if (and (consp item)
 392              (stringp (car item)))
 393         (setcar item new-name)
 394       (aset item 0 new-name))
 395     (set-menubar-dirty-flag)
 396     item))
 397
 398 \f
 399
 400 (defvar put-buffer-names-in-file-menu t)
 401
 402
 403 ;; Don't unconditionally enable menu bars; leave that up to the user.
 404 ;;(let ((frames (frame-list)))
 405 ;;  (while frames
 406 ;;    (modify-frame-parameters (car frames) '((menu-bar-lines . 1)))
 407 ;;    (setq frames (cdr frames))))
 408 ;;(or (assq 'menu-bar-lines default-frame-alist)
 409 ;;    (setq default-frame-alist
 410 ;;        (cons '(menu-bar-lines . 1) default-frame-alist)))
 411
 412 (set-menubar default-menubar)
 413 \f
 414 (provide 'lmenu)
 415
 416 ;;; lmenu.el ends here