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+;;; autoarg.el --- make digit keys supply prefix args
+
+;; Copyright (C) 1998 Free Software Foundation, Inc.
+
+;; Author:  Dave Love <fx@gnu.org>
+;; Created: 1998-09-04
+;; Keywords: abbrev, emulations
+
+;; Autoarg Mode 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.
+
+;; Autoarg Mode 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, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This provides `autoarg-mode', a global minor mode meant to emulate
+;; a facility reported from Twenex Emacs whereby digit keys supplied
+;; prefix args rather than self inserting, with a digit sequence
+;; terminated by space acting to insert the digits.
+
+;; The bindings of DIGIT and C-DIGIT are swapped and a command bound
+;; to SPC deals with a numeric prefix arg or acts normally without
+;; such an arg.  (In the absence of a suitable terminal, you'd
+;; probably want to swap DIGIT and M-DIGIT.)  See the mode doc.
+
+;; You probably don't really want to use this.
+
+;;; Code:
+
+;;;###autoload
+(defcustom autoarg-mode nil
+  "Toggle Autoarg mode.
+
+You must modify via \\[customize] for this variable to have an effect."
+  :set (lambda (symbol vaautoarg-mode (or value 0)))
+  :initialize 'custom-initialize-default
+  :type 'boolean
+  :group 'editing
+  :require 'autoarg)
+;; If you wanted a local mode:
+;; (make-variable-buffer-local 'autoarg-mode)
+
+(defvar autoarg-mode-map (make-sparse-keymap)
+  "Keymap for Autoarg Mode.")
+
+;; Loop over digit characters to set up keymap.
+(let ((i ?0))
+  (while (<= i ?9)
+    (define-key autoarg-mode-map `[,i] 'digit-argument)
+    (define-key autoarg-mode-map `[(control ,i)] 'self-insert-command)
+    (setq i (1+ i))))
+(define-key autoarg-mode-map " " 'autoarg-terminate)
+;; Logical additions:
+;; (define-key autoarg-mode-map [?-] 'negative-argument)
+;; (define-key autoarg-mode-map [(control ?-)] 'self-insert-command)
+;; A sensible/addition?
+;; (define-key autoarg-mode-map [?\r] 'autoarg-terminate)
+
+;;;###autoload
+(defun autoarg-mode (&optional arg)
+  "Toggle Autoarg mode minor mode globally.
+With ARG, turn Autoarg mode on if ARG is positive, off otherwise.
+\\<autoarg-mode-map>
+In Autoarg mode digits are bound to `digit-argument' -- i.e. they
+supply prefix arguments as C-DIGIT and M-DIGIT normally do -- and
+C-DIGIT inserts DIGIT.  \\[autoarg-terminate] terminates the prefix sequence
+and inserts the digits of the autoarg sequence into the buffer.
+Without a numeric prefix arg the normal binding of \\[autoarg-terminate] is
+invoked, i.e. what it would be with Autoarg mode off.
+
+For example:
+`6 9 \\[autoarg-terminate]' inserts `69' into the buffer, as does `C-6 C-9'.
+`6 9 a' inserts 69 `a's into the buffer.
+`6 9 \\[autoarg-terminate] \\[autoarg-terminate]' inserts `69' into the buffer and
+then invokes the normal binding of \\[autoarg-terminate].
+`C-u \\[autoarg-terminate]' invokes the normal binding of \\[autoarg-terminate] four times.
+
+\\{autoarg-mode-map}"
+  (interactive "P")
+  (let ((old-mode autoarg-mode))
+    (setq autoarg-mode (if (null arg)
+			   (not autoarg-mode)
+			 (> (prefix-numeric-value arg) 0))))
+  (if (interactive-p)
+      (message "Autoarg mode %sabled" (if autoarg-mode "en" "dis"))))
+
+(add-to-list 'minor-mode-alist '(autoarg-mode " Aarg"))
+(add-to-list 'minor-mode-map-alist (cons 'autoarg-mode autoarg-mode-map))
+
+(defun autoarg-terminate (n)
+  "Maybe terminate a digit prefix sequence.
+
+With a non-negative numeric prefix arg, insert the digits comprising
+the arg into the current buffer.  Otherwise use the binding of the key
+which invoked this function, excluding the Autoarg keymap."
+  (interactive "P")
+  (if (numberp n)
+      (insert (number-to-string n))
+    (let* ((autoarg-mode nil)		; hide the bindings
+	   (binding (key-binding (this-single-command-keys))))
+      (if binding (call-interactively binding)))))
+
+(provide 'autoarg)
+
+;;; autoarg.el ends here