lisp/tmm.el

   1 ;;; tmm.el --- text mode access to menu-bar
   2
   3 ;; Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
   4
   5 ;; Author: Ilya Zakharevich <ilya@math.mps.ohio-state.edu>
   6 ;; Maintainer: FSF
   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 2, or (at your option)
  13 ;; 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; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; To use this package add
  28
  29 ;; (autoload 'tmm-menubar 'tmm "Text mode substitute for menubar" t)
  30 ;; (global-set-key [f10] 'tmm-menubar)
  31 ;; to your .emacs file. You can also add your own access to different
  32 ;; menus available in Window System Emacs modeling definition after
  33 ;; tmm-menubar.
  34
  35 ;;; Code:
  36
  37 (require 'electric)
  38
  39 ;;; The following will be localized, added only to pacify the compiler.
  40 (defvar tmm-short-cuts)
  41 (defvar tmm-old-mb-map nil)
  42 (defvar tmm-old-comp-map)
  43 (defvar tmm-c-prompt)
  44 (defvar tmm-km-list)
  45 (defvar tmm-next-shortcut-digit)
  46 (defvar tmm-table-undef)
  47
  48 ;;;###autoload (define-key global-map "\M-`" 'tmm-menubar)
  49 ;;;###autoload (define-key global-map [f10] 'tmm-menubar)
  50 ;;;###autoload (define-key global-map [menu-bar mouse-1] 'tmm-menubar-mouse)
  51
  52 ;;;###autoload
  53 (defun tmm-menubar (&optional x-position)
  54   "Text-mode emulation of looking and choosing from a menubar.
  55 See the documentation for `tmm-prompt'.
  56 X-POSITION, if non-nil, specifies a horizontal position within the menu bar;
  57 we make that menu bar item (the one at that position) the default choice."
  58   (interactive)
  59   (run-hooks 'menu-bar-update-hook)
  60   ;; Obey menu-bar-final-items; put those items last.
  61   (let ((menu-bar (tmm-get-keybind [menu-bar]))
  62         menu-bar-item)
  63     (let ((list menu-bar-final-items))
  64       (while list
  65         (let ((item (car list)))
  66           ;; ITEM is the name of an item that we want to put last.
  67           ;; Find it in MENU-BAR and move it to the end.
  68           (let ((this-one (assq item menu-bar)))
  69             (setq menu-bar (append (delq this-one menu-bar)
  70                                    (list this-one)))))
  71         (setq list (cdr list))))
  72     (if x-position
  73         (let ((tail menu-bar)
  74               this-one
  75               (column 0))
  76           (while (and tail (< column x-position))
  77             (setq this-one (car tail))
  78             (if (and (consp (car tail))
  79                      (consp (cdr (car tail)))
  80                      (stringp (nth 1 (car tail))))
  81                 (setq column (+ column
  82                                 (length (nth 1 (car tail)))
  83                                 1)))
  84             (setq tail (cdr tail)))
  85           (setq menu-bar-item (car this-one))))
  86     (tmm-prompt menu-bar nil menu-bar-item)))
  87
  88 ;;;###autoload
  89 (defun tmm-menubar-mouse (event)
  90   "Text-mode emulation of looking and choosing from a menubar.
  91 This command is used when you click the mouse in the menubar
  92 on a console which has no window system but does have a mouse.
  93 See the documentation for `tmm-prompt'."
  94   (interactive "e")
  95   (tmm-menubar (car (posn-x-y (event-start event)))))
  96
  97 (defvar tmm-mid-prompt "==>"
  98   "*String to insert between shortcut and menu item.
  99 If nil, there will be no shortcuts. It should not consist only of spaces,
 100 or else the correct item might not be found in the `*Completions*' buffer.")
 101
 102 (defvar tmm-mb-map nil
 103   "A place to store minibuffer map.")
 104
 105 (defvar tmm-completion-prompt
 106   "Press PageUp Key to reach this buffer from the minibuffer.
 107 Alternatively, you can use Up/Down keys (or your History keys) to change
 108 the item in the minibuffer, and press RET when you are done, or press the
 109 marked letters to pick up your choice.  Type C-g or ESC ESC ESC to cancel.
 110 "
 111   "*Help text to insert on the top of the completion buffer.
 112 To save space, you can set this to nil,
 113 in which case the standard introduction text is deleted too.")
 114
 115 (defvar tmm-shortcut-style '(downcase upcase)
 116   "*What letters to use as menu shortcuts.
 117 Must be either one of the symbols `downcase' or `upcase',
 118 or else a list of the two in the order you prefer.")
 119
 120 (defvar tmm-shortcut-words 2
 121   "*How many successive words to try for shortcuts, nil means all.
 122 If you use only one of `downcase' or `upcase' for `tmm-shortcut-style',
 123 specify nil for this variable.")
 124
 125 ;;;###autoload
 126 (defun tmm-prompt (menu &optional in-popup default-item)
 127   "Text-mode emulation of calling the bindings in keymap.
 128 Creates a text-mode menu of possible choices.  You can access the elements
 129 in the menu in two ways:
 130    *)  via history mechanism from minibuffer;
 131    *)  Or via completion-buffer that is automatically shown.
 132 The last alternative is currently a hack, you cannot use mouse reliably.
 133
 134 MENU is like the MENU argument to `x-popup-menu': either a
 135 keymap or an alist of alists.
 136 DEFAULT-ITEM, if non-nil, specifies an initial default choice.
 137 Its value should be an event that has a binding in MENU."
 138   ;; If the optional argument IN-POPUP is t,
 139   ;; then MENU is an alist of elements of the form (STRING . VALUE).
 140   ;; That is used for recursive calls only.
 141   (let ((gl-str "Menu bar")  ;; The menu bar itself is not a menu keymap
 142                                         ; so it doesn't have a name.
 143         tmm-km-list out history history-len tmm-table-undef tmm-c-prompt
 144         tmm-old-mb-map tmm-old-comp-map tmm-short-cuts
 145         chosen-string choice
 146         (not-menu (not (keymapp menu))))
 147     (run-hooks 'activate-menubar-hook)
 148     ;; Compute tmm-km-list from MENU.
 149     ;; tmm-km-list is an alist of (STRING . MEANING).
 150     ;; It has no other elements.
 151     ;; The order of elements in tmm-km-list is the order of the menu bar.
 152     (mapcar (function (lambda (elt)
 153                         (if (stringp elt)
 154                             (setq gl-str elt)
 155                           (and (listp elt) (tmm-get-keymap elt not-menu)))))
 156             menu)
 157     ;; Choose an element of tmm-km-list; put it in choice.
 158     (if (and not-menu (= 1 (length tmm-km-list)))
 159         ;; If this is the top-level of an x-popup-menu menu,
 160         ;; and there is just one pane, choose that one silently.
 161         ;; This way we only ask the user one question,
 162         ;; for which element of that pane.
 163         (setq choice (cdr (car tmm-km-list)))
 164       (and tmm-km-list
 165            (let ((index-of-default 0))
 166              (if tmm-mid-prompt
 167                  (setq tmm-km-list (tmm-add-shortcuts tmm-km-list))
 168                t)
 169              ;; Find the default item's index within the menu bar.
 170              ;; We use this to decide the initial minibuffer contents
 171              ;; and initial history position.
 172              (if default-item
 173                  (let ((tail menu))
 174                    (while (and tail
 175                                (not (eq (car-safe (car tail)) default-item)))
 176                      ;; Be careful to count only the elements of MENU
 177                      ;; that actually constitute menu bar items.
 178                      (if (and (consp (car tail))
 179                               (stringp (car-safe (cdr (car tail)))))
 180                          (setq index-of-default (1+ index-of-default)))
 181                      (setq tail (cdr tail)))))
 182              (setq history (reverse (mapcar 'car tmm-km-list)))
 183              (setq history-len (length history))
 184              (setq history (append history history history history))
 185              (setq tmm-c-prompt (nth (- history-len 1 index-of-default) history))
 186              (add-hook 'minibuffer-setup-hook 'tmm-add-prompt)
 187              (save-excursion
 188                (unwind-protect
 189                    (setq out
 190                          (completing-read
 191                           (concat gl-str " (up/down to change, PgUp to menu): ")
 192                           tmm-km-list nil t nil
 193                           (cons 'history (- (* 2 history-len) index-of-default))))
 194                  (save-excursion
 195                    (remove-hook 'minibuffer-setup-hook 'tmm-add-prompt)
 196                    (if (get-buffer "*Completions*")
 197                        (progn
 198                          (set-buffer "*Completions*")
 199                          (use-local-map tmm-old-comp-map)
 200                          (bury-buffer (current-buffer)))))
 201                  ))))
 202       (setq choice (cdr (assoc out tmm-km-list)))
 203       (and (null choice)
 204            (> (length out) (length tmm-c-prompt))
 205            (string= (substring out 0 (length tmm-c-prompt)) tmm-c-prompt)
 206            (setq out (substring out (length tmm-c-prompt))
 207                  choice (cdr (assoc out tmm-km-list))))
 208       (and (null choice)
 209            (setq out (try-completion out tmm-km-list)
 210                  choice (cdr (assoc  out tmm-km-list)))))
 211     ;; CHOICE is now (STRING . MEANING).  Separate the two parts.
 212     (setq chosen-string (car choice))
 213     (setq choice (cdr choice))
 214     (cond (in-popup
 215            ;; We just did the inner level of a -popup menu.
 216            choice)
 217           ;; We just did the outer level.  Do the inner level now.
 218           (not-menu (tmm-prompt choice t))
 219           ;; We just handled a menu keymap and found another keymap.
 220           ((keymapp choice)
 221            (if (symbolp choice)
 222                (setq choice (indirect-function choice)))
 223            (condition-case nil
 224                (require 'mouse)
 225              (error nil))
 226            (condition-case nil
 227                (x-popup-menu nil choice) ; Get the shortcuts
 228              (error nil))
 229            (tmm-prompt choice))
 230           ;; We just handled a menu keymap and found a command.
 231           (choice
 232            (if chosen-string
 233                (progn
 234                  (setq last-command-event chosen-string)
 235                  (call-interactively choice))
 236              choice)))))
 237
 238 (defun tmm-add-shortcuts (list)
 239   "Adds shortcuts to cars of elements of the list.
 240 Takes a list of lists with a string as car, returns list with
 241 shortcuts added to these cars.
 242 Stores a list of all the shortcuts in the free variable `tmm-short-cuts'."
 243   (let ((tmm-next-shortcut-digit ?0))
 244     (mapcar 'tmm-add-one-shortcut (reverse list))))
 245
 246 (defsubst tmm-add-one-shortcut (elt)
 247 ;; uses the free vars tmm-next-shortcut-digit and tmm-short-cuts
 248   (let* ((str (car elt))
 249         (paren (string-match "(" str))
 250         (pos 0) (word 0) char)
 251     (catch 'done                        ; ??? is this slow?
 252       (while (and (or (not tmm-shortcut-words) ; no limit on words
 253                       (< word tmm-shortcut-words)) ; try n words
 254                   (setq pos (string-match "\\w+" str pos)) ; get next word
 255                   (not (and paren (> pos paren)))) ; don't go past "(binding.."
 256         (if (or (= pos 0)
 257                 (/= (aref str (1- pos)) ?.)) ; avoid file extensions
 258             (let ((shortcut-style
 259                    (if (listp tmm-shortcut-style) ; convert to list
 260                        tmm-shortcut-style
 261                      (list tmm-shortcut-style))))
 262               (while shortcut-style     ; try upcase and downcase variants
 263                 (setq char (funcall (car shortcut-style) (aref str pos)))
 264                 (if (not (memq char tmm-short-cuts)) (throw 'done char))
 265                 (setq shortcut-style (cdr shortcut-style)))))
 266         (setq word (1+ word))
 267         (setq pos (match-end 0)))
 268       (while (<= tmm-next-shortcut-digit ?9) ; no letter shortcut, pick a digit
 269         (setq char tmm-next-shortcut-digit)
 270         (setq tmm-next-shortcut-digit (1+ tmm-next-shortcut-digit))
 271         (if (not (memq char tmm-short-cuts)) (throw 'done char)))
 272       (setq char nil))
 273     (if char (setq tmm-short-cuts (cons char tmm-short-cuts)))
 274     (cons (concat (if char (concat (char-to-string char) tmm-mid-prompt)
 275                     ;; keep them lined up in columns
 276                     (make-string (1+ (length tmm-mid-prompt)) ?\ ))
 277                   str)
 278           (cdr elt))))
 279
 280 ;; This returns the old map.
 281 (defun tmm-define-keys (minibuffer)
 282   (let ((map (make-sparse-keymap)))
 283     (suppress-keymap map t)
 284     (mapcar
 285      (function
 286       (lambda (c)
 287         (if (listp tmm-shortcut-style)
 288             (define-key map (char-to-string c) 'tmm-shortcut)
 289           ;; only one kind of letters are shortcuts, so map both upcase and
 290           ;; downcase input to the same
 291           (define-key map (char-to-string (downcase c)) 'tmm-shortcut)
 292           (define-key map (char-to-string (upcase c)) 'tmm-shortcut))))
 293      tmm-short-cuts)
 294     (if minibuffer
 295         (progn
 296           (define-key map [pageup] 'tmm-goto-completions)
 297           (define-key map [prior] 'tmm-goto-completions)
 298           (define-key map "\ev" 'tmm-goto-completions)
 299           (define-key map "\C-n" 'next-history-element)
 300           (define-key map "\C-p" 'previous-history-element)))
 301     (prog1 (current-local-map)
 302       (use-local-map (append map (current-local-map))))))
 303
 304 (defun tmm-completion-delete-prompt ()
 305   (set-buffer standard-output)
 306   (goto-char 1)
 307   (delete-region 1 (search-forward "Possible completions are:\n")))
 308
 309 (defun tmm-add-prompt ()
 310   (remove-hook 'minibuffer-setup-hook 'tmm-add-prompt)
 311   (make-local-hook 'minibuffer-exit-hook)
 312   (add-hook 'minibuffer-exit-hook 'tmm-delete-map nil t)
 313   (let ((win (selected-window)))
 314     (setq tmm-old-mb-map (tmm-define-keys t))
 315     ;; Get window and hide it for electric mode to get correct size
 316     (save-window-excursion
 317       (let ((completions
 318              (mapcar 'car minibuffer-completion-table)))
 319         (or tmm-completion-prompt
 320             (add-hook 'completion-setup-hook
 321                       'tmm-completion-delete-prompt 'append))
 322         (with-output-to-temp-buffer "*Completions*"
 323           (display-completion-list completions))
 324         (remove-hook 'completion-setup-hook 'tmm-completion-delete-prompt))
 325       (if tmm-completion-prompt
 326           (progn
 327             (set-buffer "*Completions*")
 328             (goto-char 1)
 329             (insert tmm-completion-prompt)))
 330       )
 331     (save-selected-window
 332       (other-window 1)                  ; Electric-pop-up-window does
 333                                         ; not work in minibuffer
 334       (Electric-pop-up-window "*Completions*")
 335       (with-current-buffer "*Completions*"
 336         (setq tmm-old-comp-map (tmm-define-keys nil))))
 337
 338     (insert tmm-c-prompt)))
 339
 340 (defun tmm-delete-map ()
 341   (remove-hook 'minibuffer-exit-hook 'tmm-delete-map t)
 342   (if tmm-old-mb-map
 343       (use-local-map tmm-old-mb-map)))
 344
 345 (defun tmm-shortcut ()
 346   "Choose the shortcut that the user typed."
 347   (interactive)
 348   (let ((c last-command-char) s)
 349     (if (symbolp tmm-shortcut-style)
 350         (setq c (funcall tmm-shortcut-style c)))
 351     (if (memq c tmm-short-cuts)
 352         (if (equal (buffer-name) "*Completions*")
 353             (progn
 354               (beginning-of-buffer)
 355               (re-search-forward
 356                (concat "\\(^\\|[ \t]\\)" (char-to-string c) tmm-mid-prompt))
 357               (choose-completion))
 358           (erase-buffer)                ; In minibuffer
 359           (mapcar (lambda (elt)
 360                     (if (string=
 361                          (substring (car elt) 0
 362                                     (min (1+ (length tmm-mid-prompt))
 363                                          (length (car elt))))
 364                          (concat (char-to-string c) tmm-mid-prompt))
 365                         (setq s (car elt))))
 366                   tmm-km-list)
 367           (insert s)
 368           (exit-minibuffer)))))
 369
 370 (defun tmm-goto-completions ()
 371   (interactive)
 372   (setq tmm-c-prompt (buffer-string))
 373   (erase-buffer)
 374   (switch-to-buffer-other-window "*Completions*")
 375   (search-forward tmm-c-prompt)
 376   (search-backward tmm-c-prompt))
 377
 378 (defun tmm-get-keymap (elt &optional in-x-menu)
 379   "Prepends (DOCSTRING EVENT BINDING) to free variable `tmm-km-list'.
 380 The values are deduced from the argument ELT, that should be an
 381 element of keymap, an `x-popup-menu' argument, or an element of
 382 `x-popup-menu' argument (when IN-X-MENU is not-nil).
 383 This function adds the element only if it is not already present.
 384 It uses the free variable `tmm-table-undef' to keep undefined keys."
 385   (let (km str cache (event (car elt)))
 386     (setq elt (cdr elt))
 387     (if (eq elt 'undefined)
 388         (setq tmm-table-undef (cons (cons event nil) tmm-table-undef))
 389       (or
 390        (assoc event tmm-table-undef)
 391        (and (if (listp elt)
 392                 (or (keymapp elt) (eq (car elt) 'lambda))
 393               (fboundp elt))
 394             (setq km elt))
 395        (and (if (listp (cdr-safe elt))
 396                 (or (keymapp (cdr-safe elt))
 397                     (eq (car (cdr-safe elt)) 'lambda))
 398               (fboundp (cdr-safe elt)))
 399             (setq km (cdr elt))
 400             (and (stringp (car elt)) (setq str (car elt))))
 401        (and (if (listp (cdr-safe (cdr-safe elt)))
 402                 (or (keymapp (cdr-safe (cdr-safe elt)))
 403                     (eq (car (cdr-safe (cdr-safe elt))) 'lambda))
 404               (fboundp (cdr-safe (cdr-safe elt))))
 405             (setq km (cdr (cdr elt)))
 406             (and (stringp (car elt)) (setq str (car elt)))
 407             (or (and str
 408                      (stringp (cdr (car (cdr elt)))) ; keyseq cache
 409                      (setq cache (cdr (car (cdr elt))))
 410                      cache (setq str (concat str cache))) str))
 411        (and (if (listp (cdr-safe (cdr-safe (cdr-safe elt))))
 412                 (or (keymapp (cdr-safe (cdr-safe (cdr-safe elt))))
 413                     (eq (car (cdr-safe (cdr-safe (cdr-safe elt)))) 'lambda))
 414               (fboundp (cdr-safe (cdr-safe (cdr-safe elt)))))
 415                                         ; New style of easy-menu
 416             (setq km (cdr (cdr (cdr elt))))
 417             (and (stringp (car elt)) (setq str (car elt)))
 418             (or (and str
 419                      (stringp (cdr (car (cdr (cdr elt))))) ; keyseq cache
 420                      (setq cache (cdr (car (cdr (cdr elt)))))
 421                      cache (setq str (concat str cache)))
 422                 str))
 423             (and (stringp event)        ; x-popup or x-popup element
 424                  (if (or in-x-menu (stringp (car-safe elt)))
 425                      (setq str event event nil km elt)
 426                    (setq str event event nil km (cons 'keymap elt))
 427                    )))
 428       (and km (stringp km) (setq str km))
 429       (and km str
 430            (or (assoc str tmm-km-list)
 431                (setq tmm-km-list
 432                      (cons (cons str (cons event km)) tmm-km-list)))
 433            ))))
 434
 435 (defun tmm-get-keybind (keyseq)
 436   "Return the current binding of KEYSEQ, merging prefix definitions.
 437 If KEYSEQ is a prefix key that has local and global bindings,
 438 we merge them into a single keymap which shows the proper order of the menu.
 439 However, for the menu bar itself, the value does not take account
 440 of `menu-bar-final-items'."
 441   (let (allbind bind)
 442     (setq bind (key-binding keyseq))
 443     ;; If KEYSEQ is a prefix key, then BIND is either nil
 444     ;; or a symbol defined as a keymap (which satisfies keymapp).
 445     (if (keymapp bind)
 446         (setq bind nil))
 447     ;; If we have a non-keymap definition, return that.
 448     (or bind
 449         (progn
 450           ;; Otherwise, it is a prefix, so make a list of the subcommands.
 451           ;; Make a list of all the bindings in all the keymaps.
 452           (setq allbind (mapcar 'cdr (minor-mode-key-binding keyseq)))
 453           (setq allbind (cons (local-key-binding keyseq) allbind))
 454           (setq allbind (cons (global-key-binding keyseq) allbind))
 455           ;; Merge all the elements of ALLBIND into one keymap.
 456           (mapcar (lambda (in)
 457                     (if (and (symbolp in) (keymapp in))
 458                         (setq in (symbol-function in)))
 459                     (and in (keymapp in)
 460                          (if (keymapp bind)
 461                              (setq bind (nconc bind (copy-sequence (cdr in))))
 462                            (setq bind (copy-sequence in)))))
 463                   allbind)
 464           ;; Return that keymap.
 465           bind))))
 466
 467 (add-hook 'calendar-load-hook (lambda () (require 'cal-menu)))
 468
 469 (provide 'tmm)
 470
 471 ;;; tmm.el ends here