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+;;; iso-acc.el -- minor mode providing electric accent keys
+;;; Copyright (C) 1993 Free Software Foundation, Inc.
+
+;; Author: Johan Vromans <jv@mh.nl>
+;; Version: 1.4
+
+;; 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 2, 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; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; Function `iso-accents' activates a minor mode (`iso-accents-minor-mode')
+;; in which typewriter "dead keys" are emulated.  The purpose of this
+;; emulation is to provide a simple means for inserting accented
+;; characters according to the ISO-8859-1 character set.
+;;
+;; In `iso-accents-minor-mode', pseudo accent characters are used to
+;; introduce accented keys.  The pseudo-accent characterss are:
+;;
+;;   '  (minute)    -> grave accent
+;;   `  (backtick)  -> acute accent
+;;   "  (second)    -> diaeresis
+;;   ^  (caret)     -> circonflexe
+;;
+;; The action taken depends on the key that follows the pseudo accent.
+;; In general: 
+;;
+;;   pseudo-accent + appropriate letter -> accented letter
+;;   pseudo-accent + space -> pseudo-accent
+;;   pseudo-accent + pseudo-accent -> accent (if available)
+;;   pseudo-accent + other -> pseudo-accent + other
+;;
+;; If the pseudo-accent is followed by anything else than a 
+;; self-insert-command, the dead-key code is terminated, the
+;; pseudo-accent inserted 'as is' and the bell is rung to signal this.
+;;
+;; Function `iso-accents' can be used to enable the iso accents
+;; minor mode, or disable it when called with a non-null argument.
+\f
+;;; Code:
+
+(provide 'iso-acc)
+
+(defvar iso-accents-list
+  '(((?' ?A) ?\301)
+    ((?' ?E) ?\311)
+    ((?' ?I) ?\315)
+    ((?' ?O) ?\323)
+    ((?' ?U) ?\332)
+    ((?' ?a) ?\341)
+    ((?' ?e) ?\351)
+    ((?' ?i) ?\355)
+    ((?' ?o) ?\363)
+    ((?' ?u) ?\372)
+    ((?' ?') ?\264)
+    ((?' ? ) ?')
+    ((?` ?A) ?\300)
+    ((?` ?E) ?\310)
+    ((?` ?I) ?\314)
+    ((?` ?O) ?\322)
+    ((?` ?U) ?\331)
+    ((?` ?a) ?\340)
+    ((?` ?e) ?\350)
+    ((?` ?i) ?\354)
+    ((?` ?o) ?\362)
+    ((?` ?u) ?\371)
+    ((?` ? ) ?`)
+    ((?` ?`) ?`)               ; no special code?
+    ((?` ?A) ?\302)
+    ((?^ ?E) ?\312)
+    ((?^ ?I) ?\316)
+    ((?^ ?O) ?\324)
+    ((?^ ?U) ?\333)
+    ((?^ ?a) ?\342)
+    ((?^ ?e) ?\352)
+    ((?^ ?i) ?\356)
+    ((?^ ?o) ?\364)
+    ((?^ ?u) ?\373)
+    ((?^ ? ) ?^)
+    ((?^ ?^) ?^)               ; no special code?
+    ((?\" ?A) ?\304)
+    ((?\" ?E) ?\313)
+    ((?\" ?I) ?\317)
+    ((?\" ?O) ?\326)
+    ((?\" ?U) ?\334)
+    ((?\" ?a) ?\344)
+    ((?\" ?e) ?\353)
+    ((?\" ?i) ?\357)
+    ((?\" ?o) ?\366)
+    ((?\" ?u) ?\374)
+    ((?\" ? ) ?\")
+    ((?\" ?\") ?\250)
+    )
+  "Association list for iso accent combinations.")
+
+(defun iso-accents-dead-key ()
+  "Emulate typewriter dead keys."
+  (interactive)
+
+  ;; Pick up the dead-key.
+  (let ((first-char last-command-char))
+
+    ;; Display it and backup.
+    (insert first-char)
+    (backward-char 1)
+
+    ;; Wait for the second key and look up the combination in the list.
+    (let* ((second-char (read-event))
+          (entry (assoc (list first-char second-char) iso-accents-list)))
+      (if entry
+         ;; Found it: delete the first character and insert the combination.
+         (progn
+           (delete-char 1)
+           (insert (car (cdr entry))))
+
+       ;; Otherwise, advance and schedule the second key for execution.
+       (forward-char 1)
+       (setq unread-command-events (list second-char))
+
+       ;; If it is not a self-insert-command, ring the terminal bell.
+       (or (eq (key-binding (make-vector 1 second-char)) 'self-insert-command)
+           (beep 1))))))
+
+(defvar iso-accents-minor-mode nil
+  "Buffer local variable that denotes 'dead key' minor mode.")
+
+(defvar iso-accents-prefix-map nil
+  "Keymap for 'dead key' minor mode.")
+
+;; It is a matter of taste if you want the minor mode indicated
+;; in the mode line...
+;; If so, uncomment the next three lines.
+;; (or (assq 'iso-accents-minor-mode minor-mode-map-alist)
+;;     (setq minor-mode-alist
+;;       (append minor-mode-alist
+;;               '((iso-accents-minor-mode " ISO-Acc")))))
+
+;;;###autoload
+(defun iso-accents (&optional arg)
+  "Allow easy insertion of accented characters according to ISO-8859-1.
+When called without an argument, or with a null argument, pseudo-accent
+keys (', \", ^ and ~) will behave like dead typewriter keys: when 
+followed by an appropriate character the combination will be replaced
+by the corresponding ISO character code for the accented character.
+Calling `iso-accents' with an argument will make all keys normal again."
+;; When called, a buffer local variable iso-accents-minor-mode is created
+;; to record iso-accents-minor-mode status.
+;; A minor mode map `iso-accents-prefix-map' is used to activate the dead
+;; key handling dependend on the value of iso-accents-minor-mode.
+
+  (interactive "P")
+
+  ;; Create buffer local variable iso-accents-minor-mode.
+  (make-local-variable 'iso-accents-minor-mode)
+
+  (if arg
+      ;; Switch it off.
+      (setq iso-accents-minor-mode nil)
+
+    ;; Enable electric accents.
+    (setq iso-accents-minor-mode t)
+
+    ;; Create the minor-mode keymap, if needed.
+    (or iso-accents-prefix-map
+       (progn
+         (setq iso-accents-prefix-map (make-sparse-keymap))
+         (define-key iso-accents-prefix-map "'"  'iso-accents-dead-key)
+         (define-key iso-accents-prefix-map "`"  'iso-accents-dead-key)
+         (define-key iso-accents-prefix-map "^"  'iso-accents-dead-key)
+         (define-key iso-accents-prefix-map "\"" 'iso-accents-dead-key)
+
+         ;; Add the dead key minor mode map to the minor mode maps.
+         (or (assq 'iso-accents-minor-mode minor-mode-map-alist)
+             (setq minor-mode-map-alist
+                   (cons (cons 'iso-accents-minor-mode iso-accents-prefix-map)
+                         minor-mode-map-alist)))))))
+
+;;; iso-acc.el ends here
+