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;;; double.el --- support for keyboard remapping with double clicking -*- lexical-binding: t -*-
;; Copyright (C) 1994, 1997-1998, 2001-2025 Free Software Foundation,
;; Inc.
;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
;; Keywords: i18n
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This mode is intended for use with languages that adds a small
;; number of extra letters not available on the keyboard.
;;
;; Examples includes Scandinavian and German with an US keyboard.
;;
;; The idea is that certain keys are overloaded. When you press it
;; once it will insert one string, and when you press it twice the
;; string will be replaced by another. This can be used for mapping
;; keys on a US keyboard to generate characters according to the local
;; keyboard convention when pressed once, and according to US keyboard
;; convention when pressed twice.
;;
;; To use this mode, you must define the variable `double-map' and
;; then enable double mode with `M-x double-mode'. Read the
;; documentation for both of them.
;;
;; The default mapping is for getting Danish/Norwegian keyboard layout
;; using ISO Latin 1 on a US keyboard.
;;
;; Important node: While I would like to hear comments, bug reports,
;; suggestions, please do @strong{not} expect me to put other mappings
;; than the default into this file. There are billions and billions
;; of such mappings, and just supporting the most common would
;; increase the size of this nice small file manyfold.
;;; Code:
(defgroup double nil
"Remap keyboard, but get original by typing the same key twice."
:group 'i18n)
(defcustom double-map
'((?\; "\346" ";")
(?\' "\370" "'")
(?\[ "\345" "[")
(?\: "\306" ":")
(?\" "\330" "\"")
(?\{ "\305" "{"))
"Alist of key translations activated by double mode.
Each entry is a list with three elements:
1. The key activating the translation.
2. The string to be inserted when the key is pressed once.
3. The string to be inserted when the key is pressed twice."
:type '(repeat (list (character :tag "Key")
(string :tag "Once")
(string :tag "Twice"))))
(defcustom double-prefix-only t
"Non-nil means that Double mode mapping only works for prefix keys.
That is, for any key `X' in `double-map', `X' alone will be mapped
but not `C-u X' or `ESC X' since the X is not the prefix key."
:type 'boolean)
;;; Read Event
(defvar double-last-event nil)
;; The last key that generated a double key event.
(defun double-read-event (prompt)
;; Read an event
(if isearch-mode (isearch-update))
(if prompt
(prog2 (message "%s%c" prompt double-last-event)
(read-event)
(message ""))
(read-event)))
(global-set-key [ignore] 'ignore)
(require 'isearch)
(define-key isearch-mode-map [ignore]
(lambda () (interactive) (isearch-update)))
(defun double-translate-key (prompt)
;; Translate input events using double map.
(let ((key last-input-event))
(cond (unread-command-events
;; Artificial event, ignore it.
(vector key))
((and double-prefix-only
(> (length (this-command-keys)) 1))
;; This is not a prefix key, ignore it.
(vector key))
((eq key 'magic-start)
;; End of generated event. See if he will repeat it...
(let ((new (double-read-event prompt))
(entry (assoc double-last-event double-map)))
(force-window-update (selected-window))
(if (eq new double-last-event)
(progn
(setq unread-command-events
(append (make-list (1- (length (nth 1 entry)))
127)
(nth 2 entry)
'(magic-end)
unread-command-events))
(vector 127))
(push new unread-command-events)
[ignore])))
((eq key 'magic-end)
;; End of double event. Ignore.
[ignore])
(t
;; New key.
(let ((exp (nth 1 (assoc key double-map))))
(setq double-last-event key)
(setq unread-command-events
(append (substring exp 1) '(magic-start)
unread-command-events))
(vector (aref exp 0)))))))
;;; Mode
;;;###autoload
(define-minor-mode double-mode
"Toggle special insertion on double keypresses (Double mode).
When Double mode is enabled, some keys will insert different
strings when pressed twice. See `double-map' for details."
:lighter " Double"
:link '(emacs-commentary-link "double")
(kill-local-variable 'key-translation-map)
(when double-mode
;; Set up key-translation-map as indicated by `double-map'.
;; XXX I don't think key-translation-map should be made local here. -- Lorentey
(make-local-variable 'key-translation-map)
(let ((map (make-sparse-keymap)))
(set-keymap-parent map key-translation-map)
(setq key-translation-map map)
(dolist (entry (append double-map '((magic-start) (magic-end))))
(define-key map
(vector (nth 0 entry)) 'double-translate-key)))))
(provide 'double)
;;; double.el ends here
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