lisp/emacs-lisp/lmenu.el

   1 ;;; lmenu.el --- emulate Lucid's menubar support
   2
   3 ;; Copyright (C) 1992, 1993, 1994, 1997, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   5
   6 ;; Keywords: emulations obsolete
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 \f
  28 ;; First, emulate the Lucid menubar support in GNU Emacs 19.
  29
  30 ;; Arrange to use current-menubar to set up part of the menu bar.
  31
  32 (defvar current-menubar)
  33 (defvar lucid-menubar-map)
  34 (defvar lucid-failing-menubar)
  35
  36 (defvar recompute-lucid-menubar 'recompute-lucid-menubar)
  37 (defun recompute-lucid-menubar ()
  38   (define-key lucid-menubar-map [menu-bar]
  39     (condition-case nil
  40         (make-lucid-menu-keymap "menu-bar" current-menubar)
  41       (error (message "Invalid data in current-menubar moved to lucid-failing-menubar")
  42              (sit-for 1)
  43              (setq lucid-failing-menubar current-menubar
  44                    current-menubar nil))))
  45   (setq lucid-menu-bar-dirty-flag nil))
  46
  47 (defvar lucid-menubar-map (make-sparse-keymap))
  48 (or (assq 'current-menubar minor-mode-map-alist)
  49     (setq minor-mode-map-alist
  50           (cons (cons 'current-menubar lucid-menubar-map)
  51                 minor-mode-map-alist)))
  52
  53 ;; XEmacs compatibility
  54 (defun set-menubar-dirty-flag ()
  55   (force-mode-line-update)
  56   (setq lucid-menu-bar-dirty-flag t))
  57
  58 (defvar add-menu-item-count 0)
  59
  60 ;; This is a variable whose value is always nil.
  61 (defvar make-lucid-menu-keymap-disable nil)
  62
  63 ;; Return a menu keymap corresponding to a Lucid-style menu list
  64 ;; MENU-ITEMS, and with name MENU-NAME.
  65 (defun make-lucid-menu-keymap (menu-name menu-items)
  66   (let ((menu (make-sparse-keymap menu-name)))
  67     ;; Process items in reverse order,
  68     ;; since the define-key loop reverses them again.
  69     (setq menu-items (reverse menu-items))
  70     (while menu-items
  71       (let ((item (car menu-items))
  72             command name callback)
  73         (cond ((stringp item)
  74                (setq command nil)
  75                (setq name (if (string-match "^-+$" item) "" item)))
  76               ((consp item)
  77                (setq command (make-lucid-menu-keymap (car item) (cdr item)))
  78                (setq name (car item)))
  79               ((vectorp item)
  80                (setq command (make-symbol (format "menu-function-%d"
  81                                                   add-menu-item-count))
  82                      add-menu-item-count (1+ add-menu-item-count)
  83                      name (aref item 0)
  84                      callback (aref item 1))
  85                (if (symbolp callback)
  86                    (fset command callback)
  87                  (fset command (list 'lambda () '(interactive) callback)))
  88                (put command 'menu-alias t)
  89                (let ((i 2))
  90                  (while (< i (length item))
  91                    (cond
  92                     ((eq (aref item i) ':active)
  93                      (put command 'menu-enable
  94                           (or (aref item (1+ i))
  95                               'make-lucid-menu-keymap-disable))
  96                      (setq i (+ 2 i)))
  97                     ((eq (aref item i) ':suffix)
  98                      ;; unimplemented
  99                      (setq i (+ 2 i)))
 100                     ((eq (aref item i) ':keys)
 101                      ;; unimplemented
 102                      (setq i (+ 2 i)))
 103                     ((eq (aref item i) ':style)
 104                      ;; unimplemented
 105                      (setq i (+ 2 i)))
 106                     ((eq (aref item i) ':selected)
 107                      ;; unimplemented
 108                      (setq i (+ 2 i)))
 109                     ((and (symbolp (aref item i))
 110                           (= ?: (string-to-char (symbol-name (aref item i)))))
 111                      (error "Unrecognized menu item keyword: %S"
 112                             (aref item i)))
 113                     ((= i 2)
 114                      ;; old-style format: active-p &optional suffix
 115                      (put command 'menu-enable
 116                           (or (aref item i) 'make-lucid-menu-keymap-disable))
 117                      ;; suffix is unimplemented
 118                      (setq i (length item)))
 119                     (t
 120                      (error "Unexpected menu item value: %S"
 121                             (aref item i))))))))
 122         (if (null command)
 123             ;; Handle inactive strings specially--allow any number
 124             ;; of identical ones.
 125             (setcdr menu (cons (list nil name) (cdr menu)))
 126           (if name
 127               (define-key menu (vector (intern name)) (cons name command)))))
 128       (setq menu-items (cdr menu-items)))
 129     menu))
 130
 131 (declare-function x-popup-dialog "xmenu.c" (position contents &optional header))
 132
 133 ;; XEmacs compatibility function
 134 (defun popup-dialog-box (data)
 135   "Pop up a dialog box.
 136 A dialog box description is a list.
 137
 138  - The first element of the list is a string to display in the dialog box.
 139  - The rest of the elements are descriptions of the dialog box's buttons.
 140    Each one is a vector of three elements:
 141    - The first element is the text of the button.
 142    - The second element is the `callback'.
 143    - The third element is t or nil, whether this button is selectable.
 144
 145 If the `callback' of a button is a symbol, then it must name a command.
 146 It will be invoked with `call-interactively'.  If it is a list, then it is
 147 evaluated with `eval'.
 148
 149 One (and only one) of the buttons may be nil.  This marker means that all
 150 following buttons should be flushright instead of flushleft.
 151
 152 The syntax, more precisely:
 153
 154    form         :=  <something to pass to `eval'>
 155    command      :=  <a symbol or string, to pass to `call-interactively'>
 156    callback     :=  command | form
 157    active-p     :=  <t, nil, or a form to evaluate to decide whether this
 158                     button should be selectable>
 159    name         :=  <string>
 160    partition    :=  'nil'
 161    button       :=  '['  name callback active-p ']'
 162    dialog       :=  '(' name [ button ]+ [ partition [ button ]+ ] ')'"
 163   (let ((name (car data))
 164         (tail (cdr data))
 165         converted
 166         choice meaning)
 167     (while tail
 168       (if (null (car tail))
 169           (setq converted (cons nil converted))
 170         (let ((item (aref (car tail) 0))
 171               (callback (aref (car tail) 1))
 172               (enable (aref (car tail) 2)))
 173           (setq converted
 174                 (cons (if enable (cons item callback) item)
 175                       converted))))
 176       (setq tail (cdr tail)))
 177     (setq choice (x-popup-dialog t (cons name (nreverse converted))))
 178     (if choice
 179         (if (symbolp choice)
 180             (call-interactively choice)
 181           (eval choice)))))
 182 \f
 183 ;; This is empty because the usual elements of the menu bar
 184 ;; are provided by menu-bar.el instead.
 185 ;; It would not make sense to duplicate them here.
 186 (defconst default-menubar nil)
 187
 188 ;; XEmacs compatibility
 189 (defun set-menubar (menubar)
 190   "Set the default menubar to be menubar."
 191   (setq-default current-menubar (copy-sequence menubar))
 192   (set-menubar-dirty-flag))
 193
 194 ;; XEmacs compatibility
 195 (defun set-buffer-menubar (menubar)
 196   "Set the buffer-local menubar to be menubar."
 197   (make-local-variable 'current-menubar)
 198   (setq current-menubar (copy-sequence menubar))
 199   (set-menubar-dirty-flag))
 200
 201 \f
 202 ;;; menu manipulation functions
 203
 204 ;; XEmacs compatibility
 205 (defun find-menu-item (menubar item-path-list &optional parent)
 206   "Searches MENUBAR for item given by ITEM-PATH-LIST.
 207 Returns (ITEM . PARENT), where PARENT is the immediate parent of
 208  the item found.
 209 Signals an error if the item is not found."
 210   (or parent (setq item-path-list (mapcar 'downcase item-path-list)))
 211   (if (not (consp menubar))
 212       nil
 213     (let ((rest menubar)
 214           result)
 215       (while rest
 216         (if (and (car rest)
 217                  (equal (car item-path-list)
 218                         (downcase (if (vectorp (car rest))
 219                                       (aref (car rest) 0)
 220                                     (if (stringp (car rest))
 221                                         (car rest)
 222                                       (car (car rest)))))))
 223             (setq result (car rest) rest nil)
 224           (setq rest (cdr rest))))
 225       (if (cdr item-path-list)
 226           (if (consp result)
 227               (find-menu-item (cdr result) (cdr item-path-list) result)
 228             (if result
 229                 (signal 'error (list "not a submenu" result))
 230               (signal 'error (list "no such submenu" (car item-path-list)))))
 231         (cons result parent)))))
 232
 233
 234 ;; XEmacs compatibility
 235 (defun disable-menu-item (path)
 236   "Make the named menu item be unselectable.
 237 PATH is a list of strings which identify the position of the menu item in
 238 the menu hierarchy.  (\"File\" \"Save\") means the menu item called \"Save\"
 239 under the toplevel \"File\" menu.  (\"Menu\" \"Foo\" \"Item\") means the
 240 menu item called \"Item\" under the \"Foo\" submenu of \"Menu\"."
 241   (let* ((menubar current-menubar)
 242          (pair (find-menu-item menubar path))
 243          (item (car pair))
 244          (menu (cdr pair)))
 245     (or item
 246         (signal 'error (list (if menu "No such menu item" "No such menu")
 247                              path)))
 248     (if (consp item) (error "can't disable menus, only menu items"))
 249     (aset item 2 nil)
 250     (set-menubar-dirty-flag)
 251     item))
 252
 253
 254 ;; XEmacs compatibility
 255 (defun enable-menu-item (path)
 256   "Make the named menu item be selectable.
 257 PATH is a list of strings which identify the position of the menu item in
 258 the menu hierarchy.  (\"File\" \"Save\") means the menu item called \"Save\"
 259 under the toplevel \"File\" menu.  (\"Menu\" \"Foo\" \"Item\") means the
 260 menu item called \"Item\" under the \"Foo\" submenu of \"Menu\"."
 261   (let* ((menubar current-menubar)
 262          (pair (find-menu-item menubar path))
 263          (item (car pair))
 264          (menu (cdr pair)))
 265     (or item
 266         (signal 'error (list (if menu "No such menu item" "No such menu")
 267                              path)))
 268     (if (consp item) (error "%S is a menu, not a menu item" path))
 269     (aset item 2 t)
 270     (set-menubar-dirty-flag)
 271     item))
 272
 273
 274 (defun add-menu-item-1 (item-p menu-path item-name item-data enabled-p before)
 275   (if before (setq before (downcase before)))
 276   (let* ((menubar current-menubar)
 277          (menu (condition-case ()
 278                    (car (find-menu-item menubar menu-path))
 279                  (error nil)))
 280          (item (if (listp menu)
 281                    (car (find-menu-item (cdr menu) (list item-name)))
 282                  (signal 'error (list "not a submenu" menu-path)))))
 283     (or menu
 284         (let ((rest menu-path)
 285               (so-far menubar))
 286           (while rest
 287 ;;;         (setq menu (car (find-menu-item (cdr so-far) (list (car rest)))))
 288             (setq menu
 289                   (if (eq so-far menubar)
 290                       (car (find-menu-item so-far (list (car rest))))
 291                     (car (find-menu-item (cdr so-far) (list (car rest))))))
 292             (or menu
 293                 (let ((rest2 so-far))
 294                   (or rest2
 295                       (error "Trying to modify a menu that doesn't exist"))
 296                   (while (and (cdr rest2) (car (cdr rest2)))
 297                     (setq rest2 (cdr rest2)))
 298                   (setcdr rest2
 299                           (nconc (list (setq menu (list (car rest))))
 300                                  (cdr rest2)))))
 301             (setq so-far menu)
 302             (setq rest (cdr rest)))))
 303     (or menu (setq menu menubar))
 304     (if item
 305         nil     ; it's already there
 306       (if item-p
 307           (setq item (vector item-name item-data enabled-p))
 308         (setq item (cons item-name item-data)))
 309       ;; if BEFORE is specified, try to add it there.
 310       (if before
 311           (setq before (car (find-menu-item menu (list before)))))
 312       (let ((rest menu)
 313             (added-before nil))
 314         (while rest
 315           (if (eq before (car (cdr rest)))
 316               (progn
 317                 (setcdr rest (cons item (cdr rest)))
 318                 (setq rest nil added-before t))
 319             (setq rest (cdr rest))))
 320         (if (not added-before)
 321             ;; adding before the first item on the menubar itself is harder
 322             (if (and (eq menu menubar) (eq before (car menu)))
 323                 (setq menu (cons item menu)
 324                       current-menubar menu)
 325               ;; otherwise, add the item to the end.
 326               (nconc menu (list item))))))
 327     (if item-p
 328         (progn
 329           (aset item 1 item-data)
 330           (aset item 2 (not (null enabled-p))))
 331       (setcar item item-name)
 332       (setcdr item item-data))
 333     (set-menubar-dirty-flag)
 334     item))
 335
 336 ;; XEmacs compatibility
 337 (defun add-menu-item (menu-path item-name function enabled-p &optional before)
 338   "Add a menu item to some menu, creating the menu first if necessary.
 339 If the named item exists already, it is changed.
 340 MENU-PATH identifies the menu under which the new menu item should be inserted.
 341  It is a list of strings; for example, (\"File\") names the top-level \"File\"
 342  menu.  (\"File\" \"Foo\") names a hypothetical submenu of \"File\".
 343 ITEM-NAME is the string naming the menu item to be added.
 344 FUNCTION is the command to invoke when this menu item is selected.
 345  If it is a symbol, then it is invoked with `call-interactively', in the same
 346  way that functions bound to keys are invoked.  If it is a list, then the
 347  list is simply evaluated.
 348 ENABLED-P controls whether the item is selectable or not.
 349 BEFORE, if provided, is the name of a menu item before which this item should
 350  be added, if this item is not on the menu already.  If the item is already
 351  present, it will not be moved."
 352   (or menu-path (error "must specify a menu path"))
 353   (or item-name (error "must specify an item name"))
 354   (add-menu-item-1 t menu-path item-name function enabled-p before))
 355
 356
 357 ;; XEmacs compatibility
 358 (defun delete-menu-item (path)
 359   "Remove the named menu item from the menu hierarchy.
 360 PATH is a list of strings which identify the position of the menu item in
 361 the menu hierarchy.  (\"File\" \"Save\") means the menu item called \"Save\"
 362 under the toplevel \"File\" menu.  (\"Menu\" \"Foo\" \"Item\") means the
 363 menu item called \"Item\" under the \"Foo\" submenu of \"Menu\"."
 364   (let* ((menubar current-menubar)
 365          (pair (find-menu-item menubar path))
 366          (item (car pair))
 367          (menu (or (cdr pair) menubar)))
 368     (if (not item)
 369         nil
 370       ;; the menubar is the only special case, because other menus begin
 371       ;; with their name.
 372       (if (eq menu current-menubar)
 373           (setq current-menubar (delq item menu))
 374         (delq item menu))
 375       (set-menubar-dirty-flag)
 376       item)))
 377
 378
 379 ;; XEmacs compatibility
 380 (defun relabel-menu-item (path new-name)
 381   "Change the string of the specified menu item.
 382 PATH is a list of strings which identify the position of the menu item in
 383 the menu hierarchy.  (\"File\" \"Save\") means the menu item called \"Save\"
 384 under the toplevel \"File\" menu.  (\"Menu\" \"Foo\" \"Item\") means the
 385 menu item called \"Item\" under the \"Foo\" submenu of \"Menu\".
 386 NEW-NAME is the string that the menu item will be printed as from now on."
 387   (or (stringp new-name)
 388       (setq new-name (signal 'wrong-type-argument (list 'stringp new-name))))
 389   (let* ((menubar current-menubar)
 390          (pair (find-menu-item menubar path))
 391          (item (car pair))
 392          (menu (cdr pair)))
 393     (or item
 394         (signal 'error (list (if menu "No such menu item" "No such menu")
 395                              path)))
 396     (if (and (consp item)
 397              (stringp (car item)))
 398         (setcar item new-name)
 399       (aset item 0 new-name))
 400     (set-menubar-dirty-flag)
 401     item))
 402
 403 ;; XEmacs compatibility
 404 (defun add-menu (menu-path menu-name menu-items &optional before)
 405   "Add a menu to the menubar or one of its submenus.
 406 If the named menu exists already, it is changed.
 407 MENU-PATH identifies the menu under which the new menu should be inserted.
 408  It is a list of strings; for example, (\"File\") names the top-level \"File\"
 409  menu.  (\"File\" \"Foo\") names a hypothetical submenu of \"File\".
 410  If MENU-PATH is nil, then the menu will be added to the menubar itself.
 411 MENU-NAME is the string naming the menu to be added.
 412 MENU-ITEMS is a list of menu item descriptions.
 413  Each menu item should be a vector of three elements:
 414    - a string, the name of the menu item;
 415    - a symbol naming a command, or a form to evaluate;
 416    - and a form whose value determines whether this item is selectable.
 417 BEFORE, if provided, is the name of a menu before which this menu should
 418  be added, if this menu is not on its parent already.  If the menu is already
 419  present, it will not be moved."
 420   (or menu-name (error "must specify a menu name"))
 421   (or menu-items (error "must specify some menu items"))
 422   (add-menu-item-1 nil menu-path menu-name menu-items t before))
 423
 424 \f
 425
 426 (defvar put-buffer-names-in-file-menu t)
 427
 428
 429 ;; Don't unconditionally enable menu bars; leave that up to the user.
 430 ;;(let ((frames (frame-list)))
 431 ;;  (while frames
 432 ;;    (modify-frame-parameters (car frames) '((menu-bar-lines . 1)))
 433 ;;    (setq frames (cdr frames))))
 434 ;;(or (assq 'menu-bar-lines default-frame-alist)
 435 ;;    (setq default-frame-alist
 436 ;;        (cons '(menu-bar-lines . 1) default-frame-alist)))
 437
 438 (set-menubar default-menubar)
 439 \f
 440 (provide 'lmenu)
 441
 442 ;; arch-tag: 7051c396-2837-435a-ae11-b2d2e2af8fc1
 443 ;;; lmenu.el ends here