lisp/tmm.el

   1 ;;; tmm.el --- text mode access to menu-bar  -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 1994-1996, 2000-2014 Free Software Foundation, Inc.
   4
   5 ;; Author: Ilya Zakharevich <ilya@math.mps.ohio-state.edu>
   6 ;; Maintainer: emacs-devel@gnu.org
   7 ;; Keywords: convenience
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; This package provides text mode access to the menu bar.
  27
  28 ;;; Code:
  29
  30 (require 'electric)
  31
  32 (defgroup tmm nil
  33   "Text mode access to menu-bar."
  34   :prefix "tmm-"
  35   :group 'menu)
  36
  37 ;;; The following will be localized, added only to pacify the compiler.
  38 (defvar tmm-short-cuts)
  39 (defvar tmm-old-mb-map nil)
  40 (defvar tmm-c-prompt nil)
  41 (defvar tmm-km-list)
  42 (defvar tmm-next-shortcut-digit)
  43 (defvar tmm-table-undef)
  44
  45 ;;;###autoload (define-key global-map "\M-`" 'tmm-menubar)
  46 ;;;###autoload (define-key global-map [menu-bar mouse-1] 'tmm-menubar-mouse)
  47
  48 ;;;###autoload
  49 (defun tmm-menubar (&optional x-position)
  50   "Text-mode emulation of looking and choosing from a menubar.
  51 See the documentation for `tmm-prompt'.
  52 X-POSITION, if non-nil, specifies a horizontal position within the menu bar;
  53 we make that menu bar item (the one at that position) the default choice.
  54
  55 Note that \\[menu-bar-open] by default drops down TTY menus; if you want it
  56 to invoke `tmm-menubar' instead, customize the variable
  57 \`tty-menu-open-use-tmm' to a non-nil value."
  58   (interactive)
  59   (run-hooks 'menu-bar-update-hook)
  60   ;; Obey menu-bar-final-items; put those items last.
  61   (let ((menu-bar '())
  62         (menu-end '())
  63         menu-bar-item)
  64     (map-keymap
  65      (lambda (key binding)
  66        (push (cons key binding)
  67              ;; If KEY is the name of an item that we want to put last,
  68              ;; move it to the end.
  69              (if (memq key menu-bar-final-items)
  70                  menu-end
  71                menu-bar)))
  72      (tmm-get-keybind [menu-bar]))
  73     (setq menu-bar `(keymap ,@(nreverse menu-bar) ,@(nreverse menu-end)))
  74     (if x-position
  75         (let ((column 0))
  76           (catch 'done
  77             (map-keymap
  78              (lambda (key binding)
  79                (when (> column x-position)
  80                  (setq menu-bar-item key)
  81                  (throw 'done nil))
  82                (pcase binding
  83                  ((or `(,(and (pred stringp) name) . ,_) ;Simple menu item.
  84                       `(menu-item ,name ,_cmd            ;Extended menu item.
  85                         . ,(and props
  86                                 (guard (let ((visible
  87                                               (plist-get props :visible)))
  88                                          (or (null visible)
  89                                              (eval visible)))))))
  90                   (setq column (+ column (length name) 1)))))
  91              menu-bar))))
  92     (tmm-prompt menu-bar nil menu-bar-item)))
  93
  94 ;;;###autoload
  95 (defun tmm-menubar-mouse (event)
  96   "Text-mode emulation of looking and choosing from a menubar.
  97 This command is used when you click the mouse in the menubar
  98 on a console which has no window system but does have a mouse.
  99 See the documentation for `tmm-prompt'."
 100   (interactive "e")
 101   (tmm-menubar (car (posn-x-y (event-start event)))))
 102
 103 (defcustom tmm-mid-prompt "==>"
 104   "String to insert between shortcut and menu item.
 105 If nil, there will be no shortcuts.  It should not consist only of spaces,
 106 or else the correct item might not be found in the `*Completions*' buffer."
 107   :type 'string
 108   :group 'tmm)
 109
 110 (defvar tmm-mb-map nil
 111   "A place to store minibuffer map.")
 112
 113 (defcustom tmm-completion-prompt
 114   "Press PageUp key to reach this buffer from the minibuffer.
 115 Alternatively, you can use Up/Down keys (or your History keys) to change
 116 the item in the minibuffer, and press RET when you are done, or press the
 117 marked letters to pick up your choice.  Type C-g or ESC ESC ESC to cancel.
 118 "
 119   "Help text to insert on the top of the completion buffer.
 120 To save space, you can set this to nil,
 121 in which case the standard introduction text is deleted too."
 122   :type '(choice string (const nil))
 123   :group 'tmm)
 124
 125 (defcustom tmm-shortcut-style '(downcase upcase)
 126   "What letters to use as menu shortcuts.
 127 Must be either one of the symbols `downcase' or `upcase',
 128 or else a list of the two in the order you prefer."
 129   :type '(choice (const downcase)
 130                  (const upcase)
 131                  (repeat (choice (const downcase) (const upcase))))
 132   :group 'tmm)
 133
 134 (defcustom tmm-shortcut-words 2
 135   "How many successive words to try for shortcuts, nil means all.
 136 If you use only one of `downcase' or `upcase' for `tmm-shortcut-style',
 137 specify nil for this variable."
 138   :type '(choice integer (const nil))
 139   :group 'tmm)
 140
 141 (defface tmm-inactive
 142   '((t :inherit shadow))
 143   "Face used for inactive menu items."
 144   :group 'tmm)
 145
 146 (defun tmm--completion-table (items)
 147   (lambda (string pred action)
 148     (if (eq action 'metadata)
 149         '(metadata (display-sort-function . identity))
 150       (complete-with-action action items string pred))))
 151
 152 (defvar tmm--history nil)
 153
 154 ;;;###autoload
 155 (defun tmm-prompt (menu &optional in-popup default-item)
 156   "Text-mode emulation of calling the bindings in keymap.
 157 Creates a text-mode menu of possible choices.  You can access the elements
 158 in the menu in two ways:
 159    *)  via history mechanism from minibuffer;
 160    *)  Or via completion-buffer that is automatically shown.
 161 The last alternative is currently a hack, you cannot use mouse reliably.
 162
 163 MENU is like the MENU argument to `x-popup-menu': either a
 164 keymap or an alist of alists.
 165 DEFAULT-ITEM, if non-nil, specifies an initial default choice.
 166 Its value should be an event that has a binding in MENU."
 167   ;; If the optional argument IN-POPUP is t,
 168   ;; then MENU is an alist of elements of the form (STRING . VALUE).
 169   ;; That is used for recursive calls only.
 170   (let ((gl-str "Menu bar")  ;; The menu bar itself is not a menu keymap
 171                                         ; so it doesn't have a name.
 172         tmm-km-list out history-len tmm-table-undef tmm-c-prompt
 173         tmm-old-mb-map tmm-short-cuts
 174         chosen-string choice
 175         (not-menu (not (keymapp menu))))
 176     (run-hooks 'activate-menubar-hook)
 177     ;; Compute tmm-km-list from MENU.
 178     ;; tmm-km-list is an alist of (STRING . MEANING).
 179     ;; It has no other elements.
 180     ;; The order of elements in tmm-km-list is the order of the menu bar.
 181     (if (not not-menu)
 182         (map-keymap (lambda (k v) (tmm-get-keymap (cons k v))) menu)
 183       (dolist (elt menu)
 184         (cond
 185          ((stringp elt) (setq gl-str elt))
 186          ((listp elt) (tmm-get-keymap elt not-menu))
 187          ((vectorp elt)
 188           (dotimes (i (length elt))
 189             (tmm-get-keymap (cons i (aref elt i)) not-menu))))))
 190     (setq tmm-km-list (nreverse tmm-km-list))
 191     ;; Choose an element of tmm-km-list; put it in choice.
 192     (if (and not-menu (= 1 (length tmm-km-list)))
 193         ;; If this is the top-level of an x-popup-menu menu,
 194         ;; and there is just one pane, choose that one silently.
 195         ;; This way we only ask the user one question,
 196         ;; for which element of that pane.
 197         (setq choice (cdr (car tmm-km-list)))
 198       (unless tmm-km-list
 199         (error "Empty menu reached"))
 200       (and tmm-km-list
 201            (let ((index-of-default 0))
 202              (if tmm-mid-prompt
 203                  (setq tmm-km-list (tmm-add-shortcuts tmm-km-list))
 204                t)
 205              ;; Find the default item's index within the menu bar.
 206              ;; We use this to decide the initial minibuffer contents
 207              ;; and initial history position.
 208              (if default-item
 209                  (let ((tail menu) visible)
 210                    (while (and tail
 211                                (not (eq (car-safe (car tail)) default-item)))
 212                      ;; Be careful to count only the elements of MENU
 213                      ;; that actually constitute menu bar items.
 214                      (if (and (consp (car tail))
 215                               (or (stringp (car-safe (cdr (car tail))))
 216                                   (and
 217                                    (eq (car-safe (cdr (car tail))) 'menu-item)
 218                                    (progn
 219                                      (setq visible
 220                                            (plist-get
 221                                             (nthcdr 4 (car tail)) :visible))
 222                                      (or (not visible) (eval visible))))))
 223                          (setq index-of-default (1+ index-of-default)))
 224                      (setq tail (cdr tail)))))
 225              (let ((prompt (concat "^." (regexp-quote tmm-mid-prompt))))
 226                (setq tmm--history
 227                      (reverse (delq nil
 228                                     (mapcar
 229                                      (lambda (elt)
 230                                        (if (string-match prompt (car elt))
 231                                            (car elt)))
 232                                      tmm-km-list)))))
 233              (setq history-len (length tmm--history))
 234              (setq tmm--history (append tmm--history tmm--history
 235                                         tmm--history tmm--history))
 236              (setq tmm-c-prompt (nth (- history-len 1 index-of-default)
 237                                      tmm--history))
 238              (setq out
 239                    (if default-item
 240                        (car (nth index-of-default tmm-km-list))
 241                      (minibuffer-with-setup-hook #'tmm-add-prompt
 242                        (completing-read
 243                         (concat gl-str
 244                                 " (up/down to change, PgUp to menu): ")
 245                         (tmm--completion-table tmm-km-list) nil t nil
 246                         (cons 'tmm--history
 247                               (- (* 2 history-len) index-of-default))))))))
 248       (setq choice (cdr (assoc out tmm-km-list)))
 249       (and (null choice)
 250            (string-prefix-p tmm-c-prompt out)
 251            (setq out (substring out (length tmm-c-prompt))
 252                  choice (cdr (assoc out tmm-km-list))))
 253       (and (null choice) out
 254            (setq out (try-completion out tmm-km-list)
 255                  choice (cdr (assoc  out tmm-km-list)))))
 256     ;; CHOICE is now (STRING . MEANING).  Separate the two parts.
 257     (setq chosen-string (car choice))
 258     (setq choice (cdr choice))
 259     (cond (in-popup
 260            ;; We just did the inner level of a -popup menu.
 261            choice)
 262           ;; We just did the outer level.  Do the inner level now.
 263           (not-menu (tmm-prompt choice t))
 264           ;; We just handled a menu keymap and found another keymap.
 265           ((keymapp choice)
 266            (if (symbolp choice)
 267                (setq choice (indirect-function choice)))
 268            (condition-case nil
 269                (require 'mouse)
 270              (error nil))
 271            (tmm-prompt choice))
 272           ;; We just handled a menu keymap and found a command.
 273           (choice
 274            (if chosen-string
 275                (progn
 276                  (setq last-command-event chosen-string)
 277                  (call-interactively choice))
 278              choice)))))
 279
 280 (defun tmm-add-shortcuts (list)
 281   "Add shortcuts to cars of elements of the list.
 282 Takes a list of lists with a string as car, returns list with
 283 shortcuts added to these cars.
 284 Stores a list of all the shortcuts in the free variable `tmm-short-cuts'."
 285   (let ((tmm-next-shortcut-digit ?0))
 286     (mapcar 'tmm-add-one-shortcut (reverse list))))
 287
 288 (defsubst tmm-add-one-shortcut (elt)
 289 ;; uses the free vars tmm-next-shortcut-digit and tmm-short-cuts
 290   (cond
 291    ((eq (cddr elt) 'ignore)
 292     (cons (concat " " (make-string (length tmm-mid-prompt) ?\-)
 293                   (car elt))
 294           (cdr elt)))
 295    (t
 296     (let* ((str (car elt))
 297            (paren (string-match "(" str))
 298            (pos 0) (word 0) char)
 299       (catch 'done                             ; ??? is this slow?
 300         (while (and (or (not tmm-shortcut-words)   ; no limit on words
 301                         (< word tmm-shortcut-words)) ; try n words
 302                     (setq pos (string-match "\\w+" str pos)) ; get next word
 303                     (not (and paren (> pos paren)))) ; don't go past "(binding.."
 304           (if (or (= pos 0)
 305                   (/= (aref str (1- pos)) ?.)) ; avoid file extensions
 306               (let ((shortcut-style
 307                      (if (listp tmm-shortcut-style) ; convert to list
 308                          tmm-shortcut-style
 309                        (list tmm-shortcut-style))))
 310                 (while shortcut-style ; try upcase and downcase variants
 311                   (setq char (funcall (car shortcut-style) (aref str pos)))
 312                   (if (not (memq char tmm-short-cuts)) (throw 'done char))
 313                   (setq shortcut-style (cdr shortcut-style)))))
 314           (setq word (1+ word))
 315           (setq pos (match-end 0)))
 316         (while (<= tmm-next-shortcut-digit ?9) ; no letter shortcut, pick a digit
 317           (setq char tmm-next-shortcut-digit)
 318           (setq tmm-next-shortcut-digit (1+ tmm-next-shortcut-digit))
 319           (if (not (memq char tmm-short-cuts)) (throw 'done char)))
 320         (setq char nil))
 321       (if char (setq tmm-short-cuts (cons char tmm-short-cuts)))
 322       (cons (concat (if char (concat (char-to-string char) tmm-mid-prompt)
 323                       ;; keep them lined up in columns
 324                       (make-string (1+ (length tmm-mid-prompt)) ?\s))
 325                     str)
 326             (cdr elt))))))
 327
 328 ;; This returns the old map.
 329 (defun tmm-define-keys (minibuffer)
 330   (let ((map (make-sparse-keymap)))
 331     (suppress-keymap map t)
 332     (dolist (c tmm-short-cuts)
 333       (if (listp tmm-shortcut-style)
 334           (define-key map (char-to-string c) 'tmm-shortcut)
 335         ;; only one kind of letters are shortcuts, so map both upcase and
 336         ;; downcase input to the same
 337         (define-key map (char-to-string (downcase c)) 'tmm-shortcut)
 338         (define-key map (char-to-string (upcase c)) 'tmm-shortcut)))
 339     (if minibuffer
 340         (progn
 341           (define-key map [pageup] 'tmm-goto-completions)
 342           (define-key map [prior] 'tmm-goto-completions)
 343           (define-key map "\ev" 'tmm-goto-completions)
 344           (define-key map "\C-n" 'next-history-element)
 345           (define-key map "\C-p" 'previous-history-element)))
 346     (prog1 (current-local-map)
 347       (use-local-map (append map (current-local-map))))))
 348
 349 (defun tmm-completion-delete-prompt ()
 350   (with-current-buffer standard-output
 351   (goto-char (point-min))
 352     (delete-region (point) (search-forward "Possible completions are:\n"))))
 353
 354 (defun tmm-remove-inactive-mouse-face ()
 355   "Remove the mouse-face property from inactive menu items."
 356   (let ((inhibit-read-only t)
 357         (inactive-string
 358          (concat " " (make-string (length tmm-mid-prompt) ?\-)))
 359         next)
 360     (save-excursion
 361       (goto-char (point-min))
 362       (while (not (eobp))
 363         (setq next (next-single-char-property-change (point) 'mouse-face))
 364         (when (looking-at inactive-string)
 365           (remove-text-properties (point) next '(mouse-face))
 366           (add-text-properties (point) next '(face tmm-inactive)))
 367         (goto-char next)))
 368     (set-buffer-modified-p nil)))
 369
 370 (defun tmm-add-prompt ()
 371   (unless tmm-c-prompt
 372     (error "No active menu entries"))
 373   (setq tmm-old-mb-map (tmm-define-keys t))
 374   ;; Get window and hide it for electric mode to get correct size
 375   (or tmm-completion-prompt
 376       (add-hook 'completion-setup-hook
 377                 'tmm-completion-delete-prompt 'append))
 378   (unwind-protect
 379       (minibuffer-completion-help)
 380     (remove-hook 'completion-setup-hook 'tmm-completion-delete-prompt))
 381   (with-current-buffer "*Completions*"
 382     (tmm-remove-inactive-mouse-face)
 383     (when tmm-completion-prompt
 384       (let ((inhibit-read-only t))
 385         (goto-char (point-min))
 386         (insert tmm-completion-prompt))))
 387   (insert tmm-c-prompt))
 388
 389 (defun tmm-shortcut ()
 390   "Choose the shortcut that the user typed."
 391   (interactive)
 392   (let ((c last-command-event) s)
 393     (if (symbolp tmm-shortcut-style)
 394         (setq c (funcall tmm-shortcut-style c)))
 395     (if (memq c tmm-short-cuts)
 396         (if (equal (buffer-name) "*Completions*")
 397             (progn
 398               (goto-char (point-min))
 399               (re-search-forward
 400                (concat "\\(^\\|[ \t]\\)" (char-to-string c) tmm-mid-prompt))
 401               (choose-completion))
 402           ;; In minibuffer
 403           (delete-region (minibuffer-prompt-end) (point-max))
 404           (dolist (elt tmm-km-list)
 405             (if (string=
 406                  (substring (car elt) 0
 407                             (min (1+ (length tmm-mid-prompt))
 408                                  (length (car elt))))
 409                  (concat (char-to-string c) tmm-mid-prompt))
 410                 (setq s (car elt))))
 411           (insert s)
 412           (exit-minibuffer)))))
 413
 414 (defun tmm-goto-completions ()
 415   "Jump to the completions buffer."
 416   (interactive)
 417   (let ((prompt-end (minibuffer-prompt-end)))
 418     (setq tmm-c-prompt (buffer-substring prompt-end (point-max)))
 419     ;; FIXME: Why?
 420     (delete-region prompt-end (point-max)))
 421   (switch-to-buffer-other-window "*Completions*")
 422   (search-forward tmm-c-prompt)
 423   (search-backward tmm-c-prompt))
 424
 425 (defun tmm-get-keymap (elt &optional in-x-menu)
 426   "Prepend (DOCSTRING EVENT BINDING) to free variable `tmm-km-list'.
 427 The values are deduced from the argument ELT, that should be an
 428 element of keymap, an `x-popup-menu' argument, or an element of
 429 `x-popup-menu' argument (when IN-X-MENU is not-nil).
 430 This function adds the element only if it is not already present.
 431 It uses the free variable `tmm-table-undef' to keep undefined keys."
 432   (let (km str plist filter visible enable (event (car elt)))
 433     (setq elt (cdr elt))
 434     (if (eq elt 'undefined)
 435         (setq tmm-table-undef (cons (cons event nil) tmm-table-undef))
 436       (unless (assoc event tmm-table-undef)
 437         (cond ((if (listp elt)
 438                    (or (keymapp elt) (eq (car elt) 'lambda))
 439                  (and (symbolp elt) (fboundp elt)))
 440                (setq km elt))
 441
 442               ((if (listp (cdr-safe elt))
 443                    (or (keymapp (cdr-safe elt))
 444                        (eq (car (cdr-safe elt)) 'lambda))
 445                  (and (symbolp (cdr-safe elt)) (fboundp (cdr-safe elt))))
 446                (setq km (cdr elt))
 447                (and (stringp (car elt)) (setq str (car elt))))
 448
 449               ((if (listp (cdr-safe (cdr-safe elt)))
 450                    (or (keymapp (cdr-safe (cdr-safe elt)))
 451                        (eq (car (cdr-safe (cdr-safe elt))) 'lambda))
 452                  (and (symbolp (cdr-safe (cdr-safe elt)))
 453                       (fboundp (cdr-safe (cdr-safe elt)))))
 454                (setq km (cddr elt))
 455                (and (stringp (car elt)) (setq str (car elt))))
 456
 457               ((eq (car-safe elt) 'menu-item)
 458                ;; (menu-item TITLE COMMAND KEY ...)
 459                (setq plist (cdr-safe (cdr-safe (cdr-safe elt))))
 460                (when (consp (car-safe plist))
 461                  (setq plist (cdr-safe plist)))
 462                (setq km (nth 2 elt))
 463                (setq str (eval (nth 1 elt)))
 464                (setq filter (plist-get plist :filter))
 465                (if filter
 466                    (setq km (funcall filter km)))
 467                (setq visible (plist-get plist :visible))
 468                (if visible
 469                    (setq km (and (eval visible) km)))
 470                (setq enable (plist-get plist :enable))
 471                (if enable
 472                    (setq km (if (eval enable) km 'ignore))))
 473
 474               ((if (listp (cdr-safe (cdr-safe (cdr-safe elt))))
 475                    (or (keymapp (cdr-safe (cdr-safe (cdr-safe elt))))
 476                        (eq (car (cdr-safe (cdr-safe (cdr-safe elt)))) 'lambda))
 477                  (and (symbolp (cdr-safe (cdr-safe (cdr-safe elt))))
 478                       (fboundp (cdr-safe (cdr-safe (cdr-safe elt))))))
 479                                         ; New style of easy-menu
 480                (setq km (cdr (cddr elt)))
 481                (and (stringp (car elt)) (setq str (car elt))))
 482
 483               ((stringp event)          ; x-popup or x-popup element
 484                (setq str event)
 485                (setq event nil)
 486                (setq km (if (or in-x-menu (stringp (car-safe elt)))
 487                             elt (cons 'keymap elt)))))
 488         (unless (or (eq km 'ignore) (null str))
 489           (let ((binding (where-is-internal km nil t)))
 490             (when binding
 491               (setq binding (key-description binding))
 492               ;; Try to align the keybindings.
 493               (let ((colwidth (min 30 (- (/ (window-width) 2) 10))))
 494                 (setq str
 495                       (concat str
 496                               (make-string (max 2 (- colwidth
 497                                                      (string-width str)
 498                                                      (string-width binding)))
 499                                            ?\s)
 500                               binding)))))))
 501       (and km (stringp km) (setq str km))
 502       ;; Verify that the command is enabled;
 503       ;; if not, don't mention it.
 504       (when (and km (symbolp km) (get km 'menu-enable))
 505           (setq km (if (eval (get km 'menu-enable)) km 'ignore)))
 506       (and km str
 507            (or (assoc str tmm-km-list)
 508                (push (cons str (cons event km)) tmm-km-list))))))
 509
 510 (defun tmm-get-keybind (keyseq)
 511   "Return the current binding of KEYSEQ, merging prefix definitions.
 512 If KEYSEQ is a prefix key that has local and global bindings,
 513 we merge them into a single keymap which shows the proper order of the menu.
 514 However, for the menu bar itself, the value does not take account
 515 of `menu-bar-final-items'."
 516   (lookup-key (cons 'keymap (nreverse (current-active-maps))) keyseq))
 517
 518 (provide 'tmm)
 519
 520 ;;; tmm.el ends here