lisp/autoarg.el

   1 ;;; autoarg.el --- make digit keys supply prefix args
   2
   3 ;; Copyright (C) 1998, 2000 Free Software Foundation, Inc.
   4
   5 ;; Author:  Dave Love <fx@gnu.org>
   6 ;; Created: 1998-09-04
   7 ;; Keywords: abbrev, emulations
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; This provides `autoarg-mode', a global minor mode meant to emulate
  29 ;; a facility reported from Twenex Emacs whereby digit keys supplied
  30 ;; prefix args rather than self inserting, with a digit sequence
  31 ;; terminated by space acting to insert the digits.
  32
  33 ;; The bindings of DIGIT and C-DIGIT are swapped and a command bound
  34 ;; to SPC deals with a numeric prefix arg or acts normally without
  35 ;; such an arg.  (In the absence of a suitable terminal, you'd
  36 ;; probably want to swap DIGIT and M-DIGIT.)  See the mode doc.
  37
  38 ;; You probably don't really want to use this.
  39
  40 ;; Also provides `autoarg-kp-mode' which is similar, but leaves the
  41 ;; digit keys alone and redefines the `keypad' keys, `kp-1' &c as
  42 ;; digit arguments.  (Use `NumLock' if necessary to generate kp-N.)
  43 ;; You're more likely to want to use this.
  44
  45 ;;; Code:
  46
  47 (defvar autoarg-mode-map
  48   (let ((map (make-sparse-keymap)))
  49     ;; Loop over digit characters to set up keymap.
  50     (dotimes (i 10)
  51       (define-key map `[,(+ ?0 i)] 'digit-argument)
  52       (define-key map `[(control ,(+ ?0 i))] 'self-insert-command))
  53     (define-key map " " 'autoarg-terminate)
  54     map)
  55   "Keymap for Autoarg mode.")
  56
  57 ;; Logical additions:
  58 ;; (define-key autoarg-mode-map [?-] 'negative-argument)
  59 ;; (define-key autoarg-mode-map [(control ?-)] 'self-insert-command)
  60 ;; A sensible/addition?
  61 ;; (define-key autoarg-mode-map [?\r] 'autoarg-terminate)
  62
  63 (defvar autoarg-kp-digits
  64   (let (alist)
  65     (dotimes (i 10 alist)
  66       (push (cons (intern (format "kp-%d" i)) i) alist))))
  67
  68 (defun autoarg-kp-digit-argument (arg)
  69   "Part of the numeric argument for the next command, like `digit-argument'."
  70   (interactive "P")
  71   (let ((digit (cdr (assq last-command-char autoarg-kp-digits))))
  72     (cond ((integerp arg)
  73            (setq prefix-arg (+ (* arg 10)
  74                                (if (< arg 0) (- digit) digit))))
  75           ((eq arg '-)
  76            ;; Treat -0 as just -, so that -01 will work.
  77            (setq prefix-arg (if (zerop digit) '- (- digit))))
  78           (t
  79            (setq prefix-arg digit))))
  80   (setq universal-argument-num-events (length (this-command-keys)))
  81   (setq overriding-terminal-local-map universal-argument-map))
  82
  83 (defvar autoarg-kp-mode-map
  84   (let ((map (make-sparse-keymap)))
  85     ;; Loop over digit characters to set up keymap.
  86     (dotimes (i 10)
  87       (let ((sym (intern (format "kp-%d" i))))
  88         (define-key map (vector sym) 'autoarg-kp-digit-argument)))
  89     (define-key map [kp-subtract] 'negative-argument)
  90     map)
  91   "Keymap for Autoarg-KP mode.")
  92
  93 ;;;###autoload
  94 (define-minor-mode autoarg-mode
  95   "Toggle Autoarg minor mode globally.
  96 With ARG, turn Autoarg mode on if ARG is positive, off otherwise.
  97 \\<autoarg-mode-map>
  98 In Autoarg mode digits are bound to `digit-argument' -- i.e. they
  99 supply prefix arguments as C-DIGIT and M-DIGIT normally do -- and
 100 C-DIGIT inserts DIGIT.  \\[autoarg-terminate] terminates the prefix sequence
 101 and inserts the digits of the autoarg sequence into the buffer.
 102 Without a numeric prefix arg the normal binding of \\[autoarg-terminate] is
 103 invoked, i.e. what it would be with Autoarg mode off.
 104
 105 For example:
 106 `6 9 \\[autoarg-terminate]' inserts `69' into the buffer, as does `C-6 C-9'.
 107 `6 9 a' inserts 69 `a's into the buffer.
 108 `6 9 \\[autoarg-terminate] \\[autoarg-terminate]' inserts `69' into the buffer and
 109 then invokes the normal binding of \\[autoarg-terminate].
 110 `C-u \\[autoarg-terminate]' invokes the normal binding of \\[autoarg-terminate] four times.
 111
 112 \\{autoarg-mode-map}"
 113   nil " Aarg" autoarg-mode-map :global t)
 114
 115 ;;;###autoload
 116 (define-minor-mode autoarg-kp-mode
 117   "Toggle Autoarg-KP minor mode globally.
 118 With ARG, turn Autoarg mode on if ARG is positive, off otherwise.
 119 \\<autoarg-kp-mode-map>
 120 This is similar to \\[autoarg-mode] but rebinds the keypad keys `kp-1'
 121 &c to supply digit arguments.
 122
 123 \\{autoarg-kp-mode-map}"
 124   nil " Aakp" autoarg-kp-mode-map :global t
 125   (if autoarg-kp-mode
 126       (dotimes (i 10)
 127         (let ((sym (intern (format "kp-%d" i))))
 128           (define-key universal-argument-map (vector sym)
 129             'autoarg-kp-digit-argument)))
 130     (dotimes (i 10)
 131       (let ((sym (intern (format "kp-%d" i))))
 132         (define-key universal-argument-map (vector sym) nil)))))
 133
 134 (defun autoarg-terminate (n)
 135   "Maybe terminate a digit prefix sequence.
 136 With a non-negative numeric prefix arg, insert the digits comprising
 137 the arg into the current buffer.  Otherwise use the binding of the key
 138 which invoked this function, excluding the Autoarg keymap."
 139   (interactive "P")
 140   (if (numberp n)
 141       (insert (number-to-string n))
 142     (let* ((autoarg-mode nil)           ; hide the bindings
 143            (binding (key-binding (this-single-command-keys))))
 144       (if binding (call-interactively binding)))))
 145
 146 (provide 'autoarg)
 147
 148 ;;; autoarg.el ends here