lockcaps.el 0.6

[John Paul Wallington]

Change since last version: 
        Examines the standard case table and includes every char
        beyond 128 in its minor mode keymap, rather than just chars
        128-255.

;;; lockcaps.el --- caps lock mode for Emacs 

;; Copyright (C) 2001 John Paul Wallington

;; Author:  John Paul Wallington <address@hidden>
;; Created: 5 Sep 2001
;; Version: 0.6, 12 Sep 2001
;; Keywords: convenience

;; This file is not part of GNU Emacs.

;; This program 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.

;; This program 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.


;;; Commentary:

;; Whilst playing with Hemlock on CMU Common Lisp I did:
;;
;;      M-x apropos lock
;;
;; and the first match was:
;;
;; "Caps Lock Mode\n  Simulate having a CAPS LOCK key."
;;
;; What a neat idea.  A Google search for capslock.el garnered:
;;
;; capslock.el, a quick and dirty Emacs 19 caps-lock minor mode
;; by Eberhard Mattes <address@hidden>
;; dated 19-May-1993.
;;
;; It had been done already.  Rats.  Anyway, this is my version.
;; 
;; This version implements a minor-mode keymap rather than changing 
;; the global keymap.  It doesn't need special minibuffer precautions.
;;
;; If you (setq lockcaps-all-keys t) before loading, this version
;; examines the standard case table and includes every char beyond 128
;; in its minor mode keymp.

;;; Code:

(defvar lockcaps-mode nil
  "Mode variable for lockcaps minor mode.")
(make-variable-buffer-local 'lockcaps-mode)

(defvar lockcaps-all-keys nil
  "Non-nil means include all self-inserting keys, and every char of the 
standard case map, in `lockcaps-mode-map'.")

(defvar lockcaps-mode-map nil
  "Keymap for lockcaps minor mode.")

(unless lockcaps-mode-map
  (setq lockcaps-mode-map (make-keymap))
  (if lockcaps-all-keys
      (progn
        (substitute-key-definition
         'self-insert-command 'lockcaps-self-insert
         lockcaps-mode-map global-map)
        (map-char-table
         #'(lambda (key value)
             (when (< 128 key)
               (define-key lockcaps-mode-map
                 (vector key) 'lockcaps-self-insert)))
         (standard-case-table)))
    (let ((keys
           '(?a ?b ?c ?d ?e ?f ?g ?h ?i ?j ?k ?l ?m 
                ?n ?o ?p ?q ?r ?s ?t ?u ?v ?w ?x ?y ?z)))
      (while keys
        (define-key lockcaps-mode-map
          (char-to-string (car keys)) 'lockcaps-self-insert)
        (setq keys (cdr keys))))))


(or (assq 'lockcaps-mode minor-mode-map-alist)
    (setq minor-mode-map-alist
          (cons (cons 'lockcaps-mode lockcaps-mode-map) 
                minor-mode-map-alist)))
(or (assq 'lockcaps-mode minor-mode-alist)
    (setq minor-mode-alist
          (cons '(lockcaps-mode " CAPS") minor-mode-alist)))


(defun lockcaps-mode (&optional arg)
  "Toggle lockcaps minor mode."
  (interactive "P")
  (setq lockcaps-mode
        (if (null arg)
            (not lockcaps-mode)
          (> (prefix-numeric-value arg) 0)))
  (force-mode-line-update))
  

(defun lockcaps-self-insert (arg)
  "Insert a character in upper case."
  (interactive "*p")
  (setq last-command-char (upcase last-command-char))
  (self-insert-command arg))

(provide 'lockcaps)
;;; lockcaps.el ends here

-- 
John Paul Wallington

All right, you degenerates!  I want this place evacuated in 20 seconds!