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201 lines
6.3 KiB
EmacsLisp
201 lines
6.3 KiB
EmacsLisp
;;; double.el --- Support for keyboard remapping with double clicking
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;; Copyright (C) 1994 Free Software Foundation, Inc.
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;; Author: Per Abrahamsen <abraham@iesd.auc.dk>
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;; Keywords: i18n
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This mode is intended for use with languages that adds a small
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;; number of extra letters not available on the keyboard.
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;;
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;; Examples includes Scandinavian and German with an US keyboard.
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;;
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;; The idea is that certain keys are overloaded. When you press it
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;; once it will insert one string, and when you press it twice the
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;; string will be replaced by another. This can be used for mapping
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;; keys on a US keyboard to generate characters according to the local
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;; keyboard convention when pressed once, and according to US keyboard
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;; convention when pressed twice.
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;;
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;; To use this mode, you must define the variable `double-map' and
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;; then enable double mode with `M-x double-mode'. Read the
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;; documentation for both of them.
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;;
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;; The default mapping is for getting Danish/Norwegian keyboard layout
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;; using ISO Latin 1 on a US keyboard.
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;;
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;; Important node: While I would like to hear comments, bug reports,
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;; suggestions, please do @strong{not} expect me to put other mappings
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;; than the default into this file. There are billions and billions
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;; of such mappings, and just supporting the most common would
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;; increase the size of this nice small file manyfold.
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;;; ChangeLog:
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;; * 1994-06-21 Per Abrahamsen
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;; Added `double-prefix-only'.
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;; * 1994-02-28 Per Abrahamsen
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;; Use 127 instead of 'delete to delete a character.
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;; * 1994-02-03 Per Abrahamsen
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;; Created.
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;;; Code:
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(defvar double-map
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'((?\; "\346" ";")
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(?\' "\370" "'")
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(?\[ "\345" "[")
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(?\: "\306" ":")
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(?\" "\330" "\"")
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(?\{ "\305" "{"))
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"Alist of key translations activated by double mode.
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Each entry is a list with three elements:
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1. The key activating the translation.
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2. The string to be inserted when the key is pressed once.
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3. The string to be inserted when the key is pressed twice.")
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(defvar double-prefix-only t
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"*Non-nil means that Double mode mapping only works for prefix keys.
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That is, for any key `X' in `double-map', `X' alone will be mapped
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but not `C-u X' or `ESC X' since the X is not the prefix key.")
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;;; Read Event
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(defvar double-last-event nil)
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;; The last key that generated a double key event.
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(defun double-read-event (prompt)
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;; Read an event
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(if isearch-mode (isearch-update))
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(if prompt
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(prog2 (message "%s%c" prompt double-last-event)
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(read-event)
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(message ""))
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(read-event)))
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(global-set-key [ignore] '(lambda () (interactive)))
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(or (boundp 'isearch-mode-map)
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(load-library "isearch"))
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(define-key isearch-mode-map [ignore]
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(function (lambda () (interactive) (isearch-update))))
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(defun double-translate-key (prompt)
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;; Translate input events using double map.
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(let ((key last-input-char))
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(cond (unread-command-events
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;; Artificial event, ignore it.
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(vector key))
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((and double-prefix-only
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(> (length (this-command-keys)) 1))
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;; This is not a prefix key, ignore it.
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(vector key))
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((eq key 'magic-start)
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;; End of generated event. See if he will repeat it...
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(let ((new (double-read-event prompt))
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(entry (assoc double-last-event double-map)))
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(if (eq new double-last-event)
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(progn
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(setq unread-command-events
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(append (make-list (1- (length (nth 1 entry)))
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127)
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(nth 2 entry)
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'(magic-end)))
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(vector 127))
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(setq unread-command-events (list new))
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[ignore])))
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((eq key 'magic-end)
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;; End of double event. Ignore.
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[ignore])
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(t
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;; New key.
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(let ((exp (nth 1 (assoc key double-map))))
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(setq double-last-event key)
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(setq unread-command-events
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(append (substring exp 1) '(magic-start)))
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(vector (aref exp 0)))))))
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;;; Key Translation Map
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(defvar default-key-translation-map
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(or key-translation-map (make-sparse-keymap))
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"Key translation you want to have effect, regardless of Double mode.
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This defaults to the value of `key-translation-map' when double was
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first loaded.")
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(make-variable-buffer-local 'key-translation-map)
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(defun double-setup ()
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;; Setup key-translation-map as indicated by `double-map'.
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(setq key-translation-map (copy-keymap default-key-translation-map))
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(mapcar (function (lambda (entry)
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(define-key key-translation-map (vector (nth 0 entry))
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'double-translate-key)))
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(append double-map '((magic-start) (magic-end)))))
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;;; Mode
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(defvar double-mode nil)
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;; Indicator for the double mode.
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(make-variable-buffer-local 'double-mode)
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(or (assq 'double-mode minor-mode-alist)
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(setq minor-mode-alist
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(cons '(double-mode " Double") minor-mode-alist)))
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;; This feature seemed useless and it confused describe-mode,
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;; so I deleted it.
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;;;(defvar double-mode-name "Double")
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;;;;; Name of current double mode.
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;;; (make-variable-buffer-local 'double-mode-name)
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;;;###autoload
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(defun double-mode (arg)
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"Toggle Double mode.
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With prefix arg, turn Double mode on iff arg is positive.
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When Double mode is on, some keys will insert different strings
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when pressed twice. See variable `double-map' for details."
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(interactive "P")
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(if (or (and (null arg) double-mode)
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(<= (prefix-numeric-value arg) 0))
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;; Turn it off
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(if double-mode
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(progn
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(let ((double-map))
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(double-setup))
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(setq double-mode nil)
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(force-mode-line-update)))
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;;Turn it on
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(if double-mode
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()
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(double-setup)
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(setq double-mode t)
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(force-mode-line-update))))
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(provide 'double)
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;;; double.el ends here
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