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1 ;;; tmm.el --- text mode access to menu-bar -*- lexical-binding: t -*-
3 ;; Copyright (C) 1994-1996, 2000-2015 Free Software Foundation, Inc.
5 ;; Author: Ilya Zakharevich <ilya@math.mps.ohio-state.edu>
6 ;; Maintainer: emacs-devel@gnu.org
7 ;; Keywords: convenience
9 ;; This file is part of GNU Emacs.
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.
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.
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/>.
24 ;;; Commentary:
26 ;; This package provides text mode access to the menu bar.
28 ;;; Code:
30 (require 'electric)
32 (defgroup tmm nil
33 "Text mode access to menu-bar."
34 :prefix "tmm-"
35 :group 'menu)
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)
45 ;;;###autoload (define-key global-map "\M-`" 'tmm-menubar)
46 ;;;###autoload (define-key global-map [menu-bar mouse-1] 'tmm-menubar-mouse)
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.
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)))
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)))))
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)
110 (defvar tmm-mb-map nil
111 "A place to store minibuffer map.")
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.
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)
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)
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)
141 (defface tmm-inactive
142 '((t :inherit shadow))
143 "Face used for inactive menu items."
144 :group 'tmm)
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))))
152 (defvar tmm--history nil)
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.
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))
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)))))
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))))
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)))
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))))))
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))))))
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"))))
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)))
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 (or tmm-completion-prompt
375 (add-hook 'completion-setup-hook
376 'tmm-completion-delete-prompt 'append))
377 (unwind-protect
378 (minibuffer-completion-help)
379 (remove-hook 'completion-setup-hook 'tmm-completion-delete-prompt))
380 (with-current-buffer "*Completions*"
381 (tmm-remove-inactive-mouse-face)
382 (when tmm-completion-prompt
383 (let ((inhibit-read-only t)
384 (window (get-buffer-window "*Completions*")))
385 (goto-char (point-min))
386 (insert tmm-completion-prompt)
387 (when window
388 ;; Try to show everything just inserted and preserve height of
389 ;; *Completions* window. This should fix a behavior described
390 ;; in Bug#1291.
391 (fit-window-to-buffer window nil nil nil nil t)))))
392 (insert tmm-c-prompt))
394 (defun tmm-shortcut ()
395 "Choose the shortcut that the user typed."
396 (interactive)
397 (let ((c last-command-event) s)
398 (if (symbolp tmm-shortcut-style)
399 (setq c (funcall tmm-shortcut-style c)))
400 (if (memq c tmm-short-cuts)
401 (if (equal (buffer-name) "*Completions*")
402 (progn
403 (goto-char (point-min))
404 (re-search-forward
405 (concat "\\(^\\|[ \t]\\)" (char-to-string c) tmm-mid-prompt))
406 (choose-completion))
407 ;; In minibuffer
408 (delete-region (minibuffer-prompt-end) (point-max))
409 (dolist (elt tmm-km-list)
410 (if (string=
411 (substring (car elt) 0
412 (min (1+ (length tmm-mid-prompt))
413 (length (car elt))))
414 (concat (char-to-string c) tmm-mid-prompt))
415 (setq s (car elt))))
416 (insert s)
417 (exit-minibuffer)))))
419 (defun tmm-goto-completions ()
420 "Jump to the completions buffer."
421 (interactive)
422 (let ((prompt-end (minibuffer-prompt-end)))
423 (setq tmm-c-prompt (buffer-substring prompt-end (point-max)))
424 ;; FIXME: Why?
425 (delete-region prompt-end (point-max)))
426 (switch-to-buffer-other-window "*Completions*")
427 (search-forward tmm-c-prompt)
428 (search-backward tmm-c-prompt))
430 (defun tmm-get-keymap (elt &optional in-x-menu)
431 "Prepend (DOCSTRING EVENT BINDING) to free variable `tmm-km-list'.
432 The values are deduced from the argument ELT, that should be an
433 element of keymap, an `x-popup-menu' argument, or an element of
434 `x-popup-menu' argument (when IN-X-MENU is not-nil).
435 This function adds the element only if it is not already present.
436 It uses the free variable `tmm-table-undef' to keep undefined keys."
437 (let (km str plist filter visible enable (event (car elt)))
438 (setq elt (cdr elt))
439 (if (eq elt 'undefined)
440 (setq tmm-table-undef (cons (cons event nil) tmm-table-undef))
441 (unless (assoc event tmm-table-undef)
442 (cond ((if (listp elt)
443 (or (keymapp elt) (eq (car elt) 'lambda))
444 (and (symbolp elt) (fboundp elt)))
445 (setq km elt))
447 ((if (listp (cdr-safe elt))
448 (or (keymapp (cdr-safe elt))
449 (eq (car (cdr-safe elt)) 'lambda))
450 (and (symbolp (cdr-safe elt)) (fboundp (cdr-safe elt))))
451 (setq km (cdr elt))
452 (and (stringp (car elt)) (setq str (car elt))))
454 ((if (listp (cdr-safe (cdr-safe elt)))
455 (or (keymapp (cdr-safe (cdr-safe elt)))
456 (eq (car (cdr-safe (cdr-safe elt))) 'lambda))
457 (and (symbolp (cdr-safe (cdr-safe elt)))
458 (fboundp (cdr-safe (cdr-safe elt)))))
459 (setq km (cddr elt))
460 (and (stringp (car elt)) (setq str (car elt))))
462 ((eq (car-safe elt) 'menu-item)
463 ;; (menu-item TITLE COMMAND KEY ...)
464 (setq plist (cdr-safe (cdr-safe (cdr-safe elt))))
465 (when (consp (car-safe plist))
466 (setq plist (cdr-safe plist)))
467 (setq km (nth 2 elt))
468 (setq str (eval (nth 1 elt)))
469 (setq filter (plist-get plist :filter))
470 (if filter
471 (setq km (funcall filter km)))
472 (setq visible (plist-get plist :visible))
473 (if visible
474 (setq km (and (eval visible) km)))
475 (setq enable (plist-get plist :enable))
476 (if enable
477 (setq km (if (eval enable) km 'ignore))))
479 ((if (listp (cdr-safe (cdr-safe (cdr-safe elt))))
480 (or (keymapp (cdr-safe (cdr-safe (cdr-safe elt))))
481 (eq (car (cdr-safe (cdr-safe (cdr-safe elt)))) 'lambda))
482 (and (symbolp (cdr-safe (cdr-safe (cdr-safe elt))))
483 (fboundp (cdr-safe (cdr-safe (cdr-safe elt))))))
484 ; New style of easy-menu
485 (setq km (cdr (cddr elt)))
486 (and (stringp (car elt)) (setq str (car elt))))
488 ((stringp event) ; x-popup or x-popup element
489 (setq str event)
490 (setq event nil)
491 (setq km (if (or in-x-menu (stringp (car-safe elt)))
492 elt (cons 'keymap elt)))))
493 (unless (or (eq km 'ignore) (null str))
494 (let ((binding (where-is-internal km nil t)))
495 (when binding
496 (setq binding (key-description binding))
497 ;; Try to align the keybindings.
498 (let ((colwidth (min 30 (- (/ (window-width) 2) 10))))
499 (setq str
500 (concat str
501 (make-string (max 2 (- colwidth
502 (string-width str)
503 (string-width binding)))
504 ?\s)
505 binding)))))))
506 (and km (stringp km) (setq str km))
507 ;; Verify that the command is enabled;
508 ;; if not, don't mention it.
509 (when (and km (symbolp km) (get km 'menu-enable))
510 (setq km (if (eval (get km 'menu-enable)) km 'ignore)))
511 (and km str
512 (or (assoc str tmm-km-list)
513 (push (cons str (cons event km)) tmm-km-list))))))
515 (defun tmm-get-keybind (keyseq)
516 "Return the current binding of KEYSEQ, merging prefix definitions.
517 If KEYSEQ is a prefix key that has local and global bindings,
518 we merge them into a single keymap which shows the proper order of the menu.
519 However, for the menu bar itself, the value does not take account
520 of `menu-bar-final-items'."
521 (lookup-key (cons 'keymap (nreverse (current-active-maps))) keyseq))
523 (provide 'tmm)
525 ;;; tmm.el ends here