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534 lines
21 KiB
EmacsLisp
534 lines
21 KiB
EmacsLisp
;;; tmm.el --- text mode access to menu-bar -*- lexical-binding: t -*-
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;; Copyright (C) 1994-1996, 2000-2018 Free Software Foundation, Inc.
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;; Author: Ilya Zakharevich <ilya@math.mps.ohio-state.edu>
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: convenience
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This package provides text mode access to the menu bar.
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;;; Code:
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(require 'electric)
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(defgroup tmm nil
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"Text mode access to menu-bar."
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:prefix "tmm-"
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:group 'menu)
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;;; The following will be localized, added only to pacify the compiler.
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(defvar tmm-short-cuts)
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(defvar tmm-old-mb-map nil)
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(defvar tmm-c-prompt nil)
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(defvar tmm-km-list)
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(defvar tmm-next-shortcut-digit)
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(defvar tmm-table-undef)
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;;;###autoload (define-key global-map "\M-`" 'tmm-menubar)
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;;;###autoload (define-key global-map [menu-bar mouse-1] 'tmm-menubar-mouse)
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;;;###autoload
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(defun tmm-menubar (&optional x-position)
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"Text-mode emulation of looking and choosing from a menubar.
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See the documentation for `tmm-prompt'.
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X-POSITION, if non-nil, specifies a horizontal position within the menu bar;
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we make that menu bar item (the one at that position) the default choice.
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Note that \\[menu-bar-open] by default drops down TTY menus; if you want it
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to invoke `tmm-menubar' instead, customize the variable
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`tty-menu-open-use-tmm' to a non-nil value."
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(interactive)
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(run-hooks 'menu-bar-update-hook)
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;; Obey menu-bar-final-items; put those items last.
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(let ((menu-bar '())
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(menu-end '())
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menu-bar-item)
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(map-keymap
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(lambda (key binding)
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(push (cons key binding)
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;; If KEY is the name of an item that we want to put last,
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;; move it to the end.
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(if (memq key menu-bar-final-items)
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menu-end
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menu-bar)))
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(tmm-get-keybind [menu-bar]))
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(setq menu-bar `(keymap ,@(nreverse menu-bar) ,@(nreverse menu-end)))
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(if x-position
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(let ((column 0)
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prev-key)
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(catch 'done
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(map-keymap
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(lambda (key binding)
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(when (> column x-position)
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(setq menu-bar-item prev-key)
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(throw 'done nil))
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(setq prev-key key)
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(pcase binding
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((or `(,(and (pred stringp) name) . ,_) ;Simple menu item.
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`(menu-item ,name ,_cmd ;Extended menu item.
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. ,(and props
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(guard (let ((visible
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(plist-get props :visible)))
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(or (null visible)
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(eval visible)))))))
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(setq column (+ column (length name) 1)))))
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menu-bar))))
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(tmm-prompt menu-bar nil menu-bar-item)))
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;;;###autoload
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(defun tmm-menubar-mouse (event)
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"Text-mode emulation of looking and choosing from a menubar.
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This command is used when you click the mouse in the menubar
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on a console which has no window system but does have a mouse.
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See the documentation for `tmm-prompt'."
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(interactive "e")
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(tmm-menubar (car (posn-x-y (event-start event)))))
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(defcustom tmm-mid-prompt "==>"
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"String to insert between shortcut and menu item.
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If nil, there will be no shortcuts. It should not consist only of spaces,
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or else the correct item might not be found in the `*Completions*' buffer."
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:type 'string
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:group 'tmm)
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(defvar tmm-mb-map nil
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"A place to store minibuffer map.")
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(defcustom tmm-completion-prompt
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"Press PageUp key to reach this buffer from the minibuffer.
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Alternatively, you can use Up/Down keys (or your History keys) to change
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the item in the minibuffer, and press RET when you are done, or press the
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marked letters to pick up your choice. Type C-g or ESC ESC ESC to cancel.
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"
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"Help text to insert on the top of the completion buffer.
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To save space, you can set this to nil,
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in which case the standard introduction text is deleted too."
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:type '(choice string (const nil))
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:group 'tmm)
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(defcustom tmm-shortcut-style '(downcase upcase)
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"What letters to use as menu shortcuts.
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Must be either one of the symbols `downcase' or `upcase',
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or else a list of the two in the order you prefer."
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:type '(choice (const downcase)
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(const upcase)
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(repeat (choice (const downcase) (const upcase))))
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:group 'tmm)
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(defcustom tmm-shortcut-words 2
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"How many successive words to try for shortcuts, nil means all.
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If you use only one of `downcase' or `upcase' for `tmm-shortcut-style',
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specify nil for this variable."
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:type '(choice integer (const nil))
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:group 'tmm)
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(defface tmm-inactive
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'((t :inherit shadow))
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"Face used for inactive menu items."
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:group 'tmm)
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(defun tmm--completion-table (items)
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(lambda (string pred action)
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(if (eq action 'metadata)
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'(metadata (display-sort-function . identity))
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(complete-with-action action items string pred))))
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(defvar tmm--history nil)
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;;;###autoload
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(defun tmm-prompt (menu &optional in-popup default-item)
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"Text-mode emulation of calling the bindings in keymap.
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Creates a text-mode menu of possible choices. You can access the elements
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in the menu in two ways:
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*) via history mechanism from minibuffer;
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*) Or via completion-buffer that is automatically shown.
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The last alternative is currently a hack, you cannot use mouse reliably.
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MENU is like the MENU argument to `x-popup-menu': either a
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keymap or an alist of alists.
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DEFAULT-ITEM, if non-nil, specifies an initial default choice.
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Its value should be an event that has a binding in MENU."
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;; If the optional argument IN-POPUP is t,
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;; then MENU is an alist of elements of the form (STRING . VALUE).
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;; That is used for recursive calls only.
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(let ((gl-str "Menu bar") ;; The menu bar itself is not a menu keymap
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; so it doesn't have a name.
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tmm-km-list out history-len tmm-table-undef tmm-c-prompt
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tmm-old-mb-map tmm-short-cuts
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chosen-string choice
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(not-menu (not (keymapp menu))))
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(run-hooks 'activate-menubar-hook)
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;; Compute tmm-km-list from MENU.
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;; tmm-km-list is an alist of (STRING . MEANING).
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;; It has no other elements.
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;; The order of elements in tmm-km-list is the order of the menu bar.
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(if (not not-menu)
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(map-keymap (lambda (k v) (tmm-get-keymap (cons k v))) menu)
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(dolist (elt menu)
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(cond
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((stringp elt) (setq gl-str elt))
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((listp elt) (tmm-get-keymap elt not-menu))
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((vectorp elt)
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(dotimes (i (length elt))
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(tmm-get-keymap (cons i (aref elt i)) not-menu))))))
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;; Choose an element of tmm-km-list; put it in choice.
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(if (and not-menu (= 1 (length tmm-km-list)))
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;; If this is the top-level of an x-popup-menu menu,
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;; and there is just one pane, choose that one silently.
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;; This way we only ask the user one question,
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;; for which element of that pane.
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(setq choice (cdr (car tmm-km-list)))
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(unless tmm-km-list
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(error "Empty menu reached"))
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(and tmm-km-list
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(let ((index-of-default 0))
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(if tmm-mid-prompt
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(setq tmm-km-list (tmm-add-shortcuts tmm-km-list))
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t)
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;; Find the default item's index within the menu bar.
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;; We use this to decide the initial minibuffer contents
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;; and initial history position.
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(if default-item
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(let ((tail menu) visible)
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(while (and tail
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(not (eq (car-safe (car tail)) default-item)))
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;; Be careful to count only the elements of MENU
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;; that actually constitute menu bar items.
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(if (and (consp (car tail))
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(or (stringp (car-safe (cdr (car tail))))
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(and
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(eq (car-safe (cdr (car tail))) 'menu-item)
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(progn
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(setq visible
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(plist-get
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(nthcdr 4 (car tail)) :visible))
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(or (not visible) (eval visible))))))
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(setq index-of-default (1+ index-of-default)))
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(setq tail (cdr tail)))))
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(let ((prompt (concat "^." (regexp-quote tmm-mid-prompt))))
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(setq tmm--history
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(reverse (delq nil
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(mapcar
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(lambda (elt)
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(if (string-match prompt (car elt))
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(car elt)))
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tmm-km-list)))))
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(setq history-len (length tmm--history))
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(setq tmm--history (append tmm--history tmm--history
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tmm--history tmm--history))
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(setq tmm-c-prompt (nth (- history-len 1 index-of-default)
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tmm--history))
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(setq out
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(if default-item
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(car (nth index-of-default tmm-km-list))
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(minibuffer-with-setup-hook #'tmm-add-prompt
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;; tmm-km-list is reversed, because history
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;; needs it in LIFO order. But completion
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;; needs it in non-reverse order, so that the
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;; menu items are displayed as completion
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;; candidates in the order they are shown on
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;; the menu bar. So pass completing-read the
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;; reversed copy of the list.
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(completing-read-default
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(concat gl-str
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" (up/down to change, PgUp to menu): ")
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(tmm--completion-table (reverse tmm-km-list)) nil t nil
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(cons 'tmm--history
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(- (* 2 history-len) index-of-default))))))))
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(setq choice (cdr (assoc out tmm-km-list)))
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(and (null choice)
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(string-prefix-p tmm-c-prompt out)
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(setq out (substring out (length tmm-c-prompt))
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choice (cdr (assoc out tmm-km-list))))
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(and (null choice) out
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(setq out (try-completion out tmm-km-list)
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choice (cdr (assoc out tmm-km-list)))))
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;; CHOICE is now (STRING . MEANING). Separate the two parts.
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(setq chosen-string (car choice))
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(setq choice (cdr choice))
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(cond (in-popup
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;; We just did the inner level of a -popup menu.
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choice)
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;; We just did the outer level. Do the inner level now.
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(not-menu (tmm-prompt choice t))
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;; We just handled a menu keymap and found another keymap.
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((keymapp choice)
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(if (symbolp choice)
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(setq choice (indirect-function choice)))
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(condition-case nil
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(require 'mouse)
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(error nil))
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(tmm-prompt choice))
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;; We just handled a menu keymap and found a command.
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(choice
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(if chosen-string
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(progn
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(setq last-command-event chosen-string)
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(call-interactively choice))
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choice)))))
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(defun tmm-add-shortcuts (list)
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"Add shortcuts to cars of elements of the list.
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Takes a list of lists with a string as car, returns list with
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shortcuts added to these cars.
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Stores a list of all the shortcuts in the free variable `tmm-short-cuts'."
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(let ((tmm-next-shortcut-digit ?0))
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(mapcar 'tmm-add-one-shortcut (reverse list))))
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(defsubst tmm-add-one-shortcut (elt)
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;; uses the free vars tmm-next-shortcut-digit and tmm-short-cuts
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(cond
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((eq (cddr elt) 'ignore)
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(cons (concat " " (make-string (length tmm-mid-prompt) ?\-)
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(car elt))
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(cdr elt)))
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(t
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(let* ((str (car elt))
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(paren (string-match "(" str))
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(pos 0) (word 0) char)
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(catch 'done ; ??? is this slow?
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(while (and (or (not tmm-shortcut-words) ; no limit on words
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(< word tmm-shortcut-words)) ; try n words
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(setq pos (string-match "\\w+" str pos)) ; get next word
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(not (and paren (> pos paren)))) ; don't go past "(binding.."
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(if (or (= pos 0)
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(/= (aref str (1- pos)) ?.)) ; avoid file extensions
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(let ((shortcut-style
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(if (listp tmm-shortcut-style) ; convert to list
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tmm-shortcut-style
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(list tmm-shortcut-style))))
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(while shortcut-style ; try upcase and downcase variants
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(setq char (funcall (car shortcut-style) (aref str pos)))
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(if (not (memq char tmm-short-cuts)) (throw 'done char))
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(setq shortcut-style (cdr shortcut-style)))))
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(setq word (1+ word))
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(setq pos (match-end 0)))
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(while (<= tmm-next-shortcut-digit ?9) ; no letter shortcut, pick a digit
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(setq char tmm-next-shortcut-digit)
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(setq tmm-next-shortcut-digit (1+ tmm-next-shortcut-digit))
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(if (not (memq char tmm-short-cuts)) (throw 'done char)))
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(setq char nil))
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(if char (setq tmm-short-cuts (cons char tmm-short-cuts)))
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(cons (concat (if char (concat (char-to-string char) tmm-mid-prompt)
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;; keep them lined up in columns
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(make-string (1+ (length tmm-mid-prompt)) ?\s))
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str)
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(cdr elt))))))
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;; This returns the old map.
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(defun tmm-define-keys (minibuffer)
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(let ((map (make-sparse-keymap)))
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(suppress-keymap map t)
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(dolist (c tmm-short-cuts)
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(if (listp tmm-shortcut-style)
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(define-key map (char-to-string c) 'tmm-shortcut)
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;; only one kind of letters are shortcuts, so map both upcase and
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;; downcase input to the same
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(define-key map (char-to-string (downcase c)) 'tmm-shortcut)
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(define-key map (char-to-string (upcase c)) 'tmm-shortcut)))
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(if minibuffer
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(progn
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(define-key map [pageup] 'tmm-goto-completions)
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(define-key map [prior] 'tmm-goto-completions)
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(define-key map "\ev" 'tmm-goto-completions)
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(define-key map "\C-n" 'next-history-element)
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(define-key map "\C-p" 'previous-history-element)))
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(prog1 (current-local-map)
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(use-local-map (append map (current-local-map))))))
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(defun tmm-completion-delete-prompt ()
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(with-current-buffer standard-output
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(goto-char (point-min))
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(delete-region (point) (search-forward "Possible completions are:\n"))))
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(defun tmm-remove-inactive-mouse-face ()
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"Remove the mouse-face property from inactive menu items."
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(let ((inhibit-read-only t)
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(inactive-string
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(concat " " (make-string (length tmm-mid-prompt) ?\-)))
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next)
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(save-excursion
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(goto-char (point-min))
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(while (not (eobp))
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(setq next (next-single-char-property-change (point) 'mouse-face))
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(when (looking-at inactive-string)
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(remove-text-properties (point) next '(mouse-face))
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(add-text-properties (point) next '(face tmm-inactive)))
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(goto-char next)))
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(set-buffer-modified-p nil)))
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(defun tmm-add-prompt ()
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(unless tmm-c-prompt
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(error "No active menu entries"))
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(setq tmm-old-mb-map (tmm-define-keys t))
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(or tmm-completion-prompt
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(add-hook 'completion-setup-hook
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'tmm-completion-delete-prompt 'append))
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(unwind-protect
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(minibuffer-completion-help)
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(remove-hook 'completion-setup-hook 'tmm-completion-delete-prompt))
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(with-current-buffer "*Completions*"
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(tmm-remove-inactive-mouse-face)
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(when tmm-completion-prompt
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(let ((inhibit-read-only t)
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(window (get-buffer-window "*Completions*")))
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(goto-char (point-min))
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(insert tmm-completion-prompt)
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(when window
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;; Try to show everything just inserted and preserve height of
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;; *Completions* window. This should fix a behavior described
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;; in Bug#1291.
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(fit-window-to-buffer window nil nil nil nil t)))))
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(insert tmm-c-prompt))
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(defun tmm-shortcut ()
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"Choose the shortcut that the user typed."
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(interactive)
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(let ((c last-command-event) s)
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(if (symbolp tmm-shortcut-style)
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(setq c (funcall tmm-shortcut-style c)))
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(if (memq c tmm-short-cuts)
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(if (equal (buffer-name) "*Completions*")
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(progn
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(goto-char (point-min))
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(re-search-forward
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(concat "\\(^\\|[ \t]\\)" (char-to-string c) tmm-mid-prompt))
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(choose-completion))
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;; In minibuffer
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(delete-region (minibuffer-prompt-end) (point-max))
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(dolist (elt tmm-km-list)
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(if (string=
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(substring (car elt) 0
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(min (1+ (length tmm-mid-prompt))
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(length (car elt))))
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(concat (char-to-string c) tmm-mid-prompt))
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(setq s (car elt))))
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(insert s)
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(exit-minibuffer)))))
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(defun tmm-goto-completions ()
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"Jump to the completions buffer."
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(interactive)
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(let ((prompt-end (minibuffer-prompt-end)))
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(setq tmm-c-prompt (buffer-substring prompt-end (point-max)))
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;; FIXME: Why?
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(delete-region prompt-end (point-max)))
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(switch-to-buffer-other-window "*Completions*")
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(search-forward tmm-c-prompt)
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(search-backward tmm-c-prompt))
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(defun tmm-get-keymap (elt &optional in-x-menu)
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"Prepend (DOCSTRING EVENT BINDING) to free variable `tmm-km-list'.
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The values are deduced from the argument ELT, that should be an
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element of keymap, an `x-popup-menu' argument, or an element of
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`x-popup-menu' argument (when IN-X-MENU is not-nil).
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This function adds the element only if it is not already present.
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It uses the free variable `tmm-table-undef' to keep undefined keys."
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(let (km str plist filter visible enable (event (car elt)))
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(setq elt (cdr elt))
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(if (eq elt 'undefined)
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(setq tmm-table-undef (cons (cons event nil) tmm-table-undef))
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(unless (assoc event tmm-table-undef)
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(cond ((if (listp elt)
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(or (keymapp elt) (eq (car elt) 'lambda))
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(and (symbolp elt) (fboundp elt)))
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(setq km elt))
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((if (listp (cdr-safe elt))
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(or (keymapp (cdr-safe elt))
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(eq (car (cdr-safe elt)) 'lambda))
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(and (symbolp (cdr-safe elt)) (fboundp (cdr-safe elt))))
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(setq km (cdr elt))
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(and (stringp (car elt)) (setq str (car elt))))
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((if (listp (cdr-safe (cdr-safe elt)))
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(or (keymapp (cdr-safe (cdr-safe elt)))
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(eq (car (cdr-safe (cdr-safe elt))) 'lambda))
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(and (symbolp (cdr-safe (cdr-safe elt)))
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(fboundp (cdr-safe (cdr-safe elt)))))
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(setq km (cddr elt))
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(and (stringp (car elt)) (setq str (car elt))))
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((eq (car-safe elt) 'menu-item)
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;; (menu-item TITLE COMMAND KEY ...)
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(setq plist (cdr-safe (cdr-safe (cdr-safe elt))))
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(when (consp (car-safe plist))
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(setq plist (cdr-safe plist)))
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(setq km (nth 2 elt))
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(setq str (eval (nth 1 elt)))
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(setq filter (plist-get plist :filter))
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(if filter
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(setq km (funcall filter km)))
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(setq visible (plist-get plist :visible))
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(if visible
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(setq km (and (eval visible) km)))
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(setq enable (plist-get plist :enable))
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(if enable
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(setq km (if (eval enable) km 'ignore))))
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((if (listp (cdr-safe (cdr-safe (cdr-safe elt))))
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(or (keymapp (cdr-safe (cdr-safe (cdr-safe elt))))
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(eq (car (cdr-safe (cdr-safe (cdr-safe elt)))) 'lambda))
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(and (symbolp (cdr-safe (cdr-safe (cdr-safe elt))))
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(fboundp (cdr-safe (cdr-safe (cdr-safe elt))))))
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; New style of easy-menu
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(setq km (cdr (cddr elt)))
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(and (stringp (car elt)) (setq str (car elt))))
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((stringp event) ; x-popup or x-popup element
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(setq str event)
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(setq event nil)
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(setq km (if (or in-x-menu (stringp (car-safe elt)))
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elt (cons 'keymap elt)))))
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(unless (or (eq km 'ignore) (null str))
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(let ((binding (where-is-internal km nil t)))
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(when binding
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(setq binding (key-description binding))
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;; Try to align the keybindings.
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(let ((colwidth (min 30 (- (/ (window-width) 2) 10))))
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(setq str
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(concat str
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(make-string (max 2 (- colwidth
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(string-width str)
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(string-width binding)))
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?\s)
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binding)))))))
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(and km (stringp km) (setq str km))
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;; Verify that the command is enabled;
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;; if not, don't mention it.
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(when (and km (symbolp km) (get km 'menu-enable))
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(setq km (if (eval (get km 'menu-enable)) km 'ignore)))
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(and km str
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(or (assoc str tmm-km-list)
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(push (cons str (cons event km)) tmm-km-list))))))
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(defun tmm-get-keybind (keyseq)
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"Return the current binding of KEYSEQ, merging prefix definitions.
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If KEYSEQ is a prefix key that has local and global bindings,
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we merge them into a single keymap which shows the proper order of the menu.
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However, for the menu bar itself, the value does not take account
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of `menu-bar-final-items'."
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(lookup-key (cons 'keymap (nreverse (current-active-maps))) keyseq))
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(provide 'tmm)
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;;; tmm.el ends here
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