;; 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.
+;; 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:
+;;; Commentary:
-;; The single entry point, `rot13-other-window', oerforms a Caesar cipher
+;; The single entry point, `rot13-other-window', performs a Caesar cipher
;; encrypt/decrypt on the current buffer and displays the result in another
-;; window. Rot13 encryption is sometimes used on USENET as a read-at-yur-
+;; window. Rot13 encryption is sometimes used on USENET as a read-at-your-
;; own-risk wrapper for material some might consider offensive, such as
;; ethnic humor.
;;
-;; Written by Howard Gayle. See case-table.el for details.
+;; Written by Howard Gayle.
;; This hack is mainly to show off the char table stuff.
;;; Code:
(let ((table (make-display-table))
(i 0))
(while (< i 26)
- (aset table (+ i ?a) (make-rope (+ (% (+ i 13) 26) ?a)))
- (aset table (+ i ?A) (make-rope (+ (% (+ i 13) 26) ?A)))
+ (aset table (+ i ?a) (vector (+ (% (+ i 13) 26) ?a)))
+ (aset table (+ i ?A) (vector (+ (% (+ i 13) 26) ?A)))
(setq i (1+ i)))
table)
"Char table for rot 13 display.")
+;;;###autoload
(defun rot13-other-window ()
- "Display current buffer in rot 13 in another window."
+ "Display current buffer in rot 13 in another window.
+To terminate the rot13 display, delete that window."
(interactive)
(let ((w (display-buffer (current-buffer) t)))
(set-window-display-table w rot13-display-table)))
+;;;###autoload
+(defun toggle-rot13-mode ()
+ "Toggle the use of rot 13 encoding for the current window."
+ (interactive)
+ (if (eq (window-display-table (selected-window)) rot13-display-table)
+ (set-window-display-table (selected-window) nil)
+ (if (null (window-display-table (selected-window)))
+ (set-window-display-table (selected-window) rot13-display-table))))
+
(provide 'rot13)
;;; rot13.el ends here