/usr/share/emacs/site-lisp/mew/contrib/mew-caesar.el is in mew-beta 7.0.50~6.7+0.20170719-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;
;; mew-caesar.el --- Caesar encrypt/decrypt assistant package for Mew.
;;
;; Author: Hideyuki SHIRAI <shirai@mew.org>
;; Created: <02/07/1998>
;;
;; To use mew-caesar.el, install (tm|SEMI) package or "nkf"
;; , and put the following codes in your .emacs.
;;
;; (add-hook 'mew-init-hook
;; (lambda ()
;; (require 'mew-caesar)))
;;
(eval-when-compile
(require 'mew))
(defconst mew-caesar-version "mew-caesar.el 0.21")
(defvar mew-caesar-ext-prog
(let (extprog)
(cond
((or (memq system-type '(OS/2 emx))
(eq system-type 'windows-nt))
(cond
((setq extprog (mew-which "nkf.exe" exec-path))
extprog)
((setq extprog (mew-which "nkf32.exe" exec-path))
extprog)
(t nil)))
(t (setq extprog (mew-which "nkf" exec-path))
extprog)))
"mew-caesar external program.
Usually, auto searched \"nkf\", \"nkf.exe\" or \"nkf32.exe\"."
)
(defvar mew-caesar-ext-prog-arg '("-r"))
(defvar mew-caesar-function
(cond
((or (featurep 'mule-caesar)
(locate-library "mule-caesar"))
(require 'mule-caesar)
'semi)
((or (featurep 'tm-def)
(locate-library "tm-def"))
(require 'tm-def)
'tm)
(mew-caesar-ext-prog
'ext)
(t
(message "mew-caesar: program is not found")
nil))
"mew-caesar function select.
Usually auto selected, which
'semi(mule-caesar), 'tm(tm:caesar-region) or 'ext(mew-caesar-ext-prog)."
)
(defvar mew-caesar-prog-xrot '(mew-caesar-mime-text/x-rot () nil))
(defconst mew-caesar-ct-rot13 "Text/X-Rot13-47-48")
(defconst mew-caesar-rot13-suffix ".rot")
(define-key mew-summary-mode-map "\C-cr" 'mew-caesar-summary-insert-xrot)
(define-key mew-draft-attach-map "R" 'mew-caesar-attach-find-new-xrot)
(setq mew-mime-content-type
(append
'(("text/x-rot13-47-48" "\\.rot$" nil mew-caesar-prog-xrot mew-icon-text)
("text/x-rot13.*" "\\.rot$" nil mew-caesar-prog-xrot mew-icon-text))
mew-mime-content-type))
(defun mew-caesar-mime-text/x-rot (cache beg end &optional params execute)
(if (> end beg)
(save-excursion
(set-buffer (mew-buffer-message))
(let ((buffer-read-only nil))
(insert " # # ###### ####### ####### # #####\n"
" # # # # # # # ## # #\n"
" # # # # # # # # # #\n"
" # ##### ###### # # # # #####\n"
" # # # # # # # # #\n"
" # # # # # # # # # #\n"
" # # # # ####### # ##### #####\n"
"\n")
(insert "To save this part, type "
(substitute-command-keys
"\\<mew-summary-mode-map>\\[mew-summary-save].")
"\nTo display this part in Message mode, type "
(substitute-command-keys
"\\<mew-summary-mode-map>\\[mew-caesar-summary-insert-xrot]."))
(insert "\n\n-------------------- Original \"X-ROT13\" follows --------------------\n")
(insert-buffer-substring cache beg end)
))))
(defun mew-caesar-summary-insert-xrot ()
(interactive)
(mew-summary-part
(let* ((fld (mew-current-get-fld (mew-frame-id)))
(msg (mew-current-get-msg (mew-frame-id)))
(part (mew-syntax-nums))
(cache (mew-cache-hit fld msg 'must-hit))
(syntax (mew-cache-decode-syntax cache))
(stx (mew-syntax-get-entry syntax part))
(beg (mew-syntax-get-begin stx))
(end (mew-syntax-get-end stx))
(win (selected-window)))
(unwind-protect
(progn
(mew-summary-toggle-disp-msg 'on)
(mew-window-configure 'message)
(set-buffer (mew-buffer-message))
(mew-elet
(mew-summary-display-preamble)
(insert-buffer-substring cache beg end)
(mew-caesar-whole-buffer)
;; (goto-char (point-min))
(mew-summary-display-postscript)))
(select-window win)))))
(defun mew-caesar-attach-find-new-xrot ()
"Open a new Caesar encrypt file into a buffer on \".\" in attachments."
(interactive)
(if (not (mew-attach-not-line012-1))
(message "Cannot find a new file here")
(let* ((nums (mew-syntax-nums))
(subdir (mew-attach-expand-path mew-encode-syntax nums))
(attachdir (mew-attachdir))
file filepath)
;; attachdir / {subdir/} dir
(if (not (equal subdir ""))
(setq attachdir (expand-file-name subdir attachdir)))
;; attachdir / file
(setq filepath (mew-random-filename attachdir 1 nil mew-caesar-rot13-suffix))
(if (null filepath)
(message "Could not make a text file, sorry")
(setq file (file-name-nondirectory filepath))
(setq mew-encode-syntax
(mew-syntax-insert-entry
mew-encode-syntax
nums
(mew-encode-syntax-single file (list mew-caesar-ct-rot13))))
(mew-encode-syntax-print mew-encode-syntax)
;;
(find-file filepath)
;; buffer switched
(setq mode-name "X-Rot13")
(setq mode-line-buffer-identification mew-mode-line-id)
(local-set-key "\C-c\C-q" 'mew-kill-buffer)
(local-set-key "\C-cr" 'mew-caesar-whole-buffer)
(local-set-key "\C-c\C-s" 'mew-caesar-save-exit)
(insert " # # ###### ####### ####### # #####\n"
" # # # # # # # ## # #\n"
" # # # # # # # # # #\n"
" # ##### ###### # # # # #####\n"
" # # # # # # # # #\n"
" # # # # # # # # # #\n"
" # # # # ####### # ##### #####\n")
(insert "\n define-key \"\\C-cr\" -> mew-caesar-whole-buffer.")
(insert "\n define-key \"\\C-c\\C-s\" -> mew-caesar-save-exit.")
(insert "\n\n Press any key to start editting.")
(read-char-exclusive)
(delete-region (point-min) (point-max))
(run-hooks 'mew-caesar-xrot-mode-hook)
))))
(defun mew-caesar-save-exit ()
"Caesar encrypt/decrypt at whole buffer, save and exit."
(interactive)
(mew-caesar-whole-buffer)
(if (y-or-n-p (format "Save & Exit ?"))
(progn
(save-buffer)
(kill-buffer (current-buffer)))
(mew-caesar-whole-buffer)))
(defun mew-caesar-whole-buffer ()
"Caesar encrypt/decrypt at whole buffer."
(interactive)
(mew-caesar-region (point-min) (point-max)))
(defun mew-caesar-region (min max)
"Caesar encrypt/decrypt in region."
(interactive "r")
(save-excursion
(cond
((eq mew-caesar-function 'semi)
(mule-caesar-region min max))
((eq mew-caesar-function 'tm)
(progn
(goto-char min)
(push-mark (point) nil t)
(goto-char max)
(tm:caesar-region)))
((and (eq mew-caesar-function 'ext)
mew-caesar-ext-prog mew-caesar-ext-prog-arg)
(save-excursion
(mew-piolet
mew-cs-autoconv mew-cs-m17n
(apply (function call-process-region)
min max
mew-caesar-ext-prog
t t nil
mew-caesar-ext-prog-arg))))
(t
(message "mew-caesar: program is not found")))
))
(provide 'mew-caesar)
;;; Copyright Notice:
;; Copyright (C) 1998-2000 Hideyuki SHIRAI <shirai@mew.org>
;; Copyright (C) 1994-2000 Mew developing team.
;; All rights reserved.
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions
;; are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; 2. Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in the
;; documentation and/or other materials provided with the distribution.
;; 3. Neither the name of the team nor the names of its contributors
;; may be used to endorse or promote products derived from this software
;; without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS'' AND
;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
;; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE TEAM OR CONTRIBUTORS BE
;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
;; BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
;; OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
;; IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;; mew-caesar.el ends here
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