To: warlord@MIT.EDU (Derek Atkins)
In-reply-to: warlord@MIT.EDU's message of 1 Mar 1993 03:59:41 GMT
Subject: Request for Mailer Scripts
BCC: jtkohl
Full-name: John T Kohl
X-US-Snail: DEC, 110 Spit Brook Road, M/S ZKO3-3/U14, Nashua, NH  03062
--text follows this line--
here's some elisp I got from Bill Sommerfeld, and hacked up a bit
myself:
;;;
;;; wrapper for the "Pretty-Good-Privacy" program.
;;;

(defvar pgp-program (expand-file-name "/usr/local/bin/pgp") 
  "*Name of the PGP executable")
(defvar pgp-sender-name "jtkohl@zk3"
  "*Name of secret key to use for signing/encrypting messages with PGP")

(require 'rmail)
(require 'terminal)
(require 'backquote)

(defvar pgp-encrypt-mail t)
(defvar pgp-sign-mail t)
(defvar pgp-output-mode-map nil
  "Keymap used in PGP Output mode")

(defvar pgp-finished)
(make-variable-buffer-local 'pgp-finished)
(set-default 'pgp-finished nil)
(defvar termhook-finished)
(make-variable-buffer-local 'termhook-finished)
(set-default 'termhook-finished nil)

(defun pgp-output-quit ()
  (interactive)
  (let ((buffer (current-buffer)))
    (switch-to-buffer
     (if (and (boundp 'pgp-prev-buffer) (bufferp pgp-prev-buffer))
	 pgp-prev-buffer
       (other-buffer buffer)))
    (bury-buffer buffer)))

(defun pgp-keymap-init ()
  (setq pgp-output-mode-map (make-keymap))
  (suppress-keymap pgp-output-mode-map)
  (define-key pgp-output-mode-map " " 'scroll-up)
  (define-key pgp-output-mode-map "\177" 'scroll-down)
  (define-key pgp-output-mode-map "q" 'pgp-output-quit))

(if (not pgp-output-mode-map)
  (pgp-keymap-init))

(defun pgp-output-mode ()
  (interactive)
  (fundamental-mode)
  (setq mode-name "PGP-Output")
  (setq major-mode 'pgp-output-mode)
  (setq buffer-read-only t)
  (setq buffer-auto-save-file-name nil)
  (use-local-map pgp-output-mode-map))


;; a "continuation".. what we do after pgp is done..
;; this could set the current buffer (the terminal emulator one) 
;; into a new major mode (pgp-after-mode) to let you do things like:
;;  a) easily dismiss the pgp window
;;  b) view any output files.
;;  c) see what the "labelling" on the files was
;; (i.e., signature, encrypted); this shows up in mode line, not file!

(defun pgp-continue-frob (out-filename prev-buffer)
  (cond ((file-exists-p out-filename)
	 (set-buffer (get-buffer-create "*PGP Output*"))
	 (make-variable-buffer-local 'pgp-prev-buffer)
	 (setq pgp-prev-buffer nil)
	 (setq buffer-read-only nil)
	 (erase-buffer)
	 (insert-file-contents out-filename)
	 (delete-file out-filename)
	 (switch-to-buffer "*PGP Output*")
	 (pgp-output-mode)
	 (setq pgp-prev-buffer prev-buffer))
	(t (message "PGP command completed with no output file" ))))

(defun pgp-continue-in-place  (out-file buf min max cont)
  (cond ((file-exists-p out-file)
	 (switch-to-buffer buf)
	 (goto-char min)
	 (delete-region min max)
	 (insert-file-contents out-file)
	 (delete-file out-file)
	 (apply cont nil))
	(t (message "PGP command completed with no output file"))))

(defun pgp-mail-continue ()
  (mail-to)
  (insert (save-excursion
	    (set-buffer "*PGP*")	;!!!
	    (goto-char (point-min))
	    (re-search-forward "Recipient's")
	    (re-search-forward "user ID: \\(.*$\\)")
	    (buffer-substring (match-beginning 1) (match-end 1)))))

(defvar pgp-base-file-name nil
  "Default base file name for PGP temp files; defaults to a file in
/tmp with your UNIX user id in it.")

(defun pgp-check-tempname ()
  (if pgp-base-file-name
      ()
    (setq pgp-base-file-name  (format "/tmp/pgp%d" (user-real-uid)))))

(defun pgp-frob-region-1 (min max cont1 &optional opt1 opt2)
  (pgp-check-tempname)
  (let ((temp-filename (format "%s.txt" pgp-base-file-name))
	(out-filename  (format "%s.asc" pgp-base-file-name))
	(prev-buffer (current-buffer)))
    (if (file-exists-p temp-filename)
	(delete-file temp-filename))
    (if (file-exists-p out-filename)
	(delete-file out-filename))
    (write-region min max temp-filename)
    
    (let ((buf (get-buffer-create "*PGP*")))
      (switch-to-buffer buf)
      (erase-buffer)
      (let ((terminal-mode-hook
	     (function
	      (lambda ()
		(make-variable-buffer-local 'terminal-finished-hook) 
		(setq terminal-finished-hook (apply cont1 out-filename prev-buffer nil))
		(setq termhook-finished t)
		(if (and
		     (boundp 'pgp-finished)
		     pgp-finished)
		    (let ((nhooks terminal-finished-hook))
		      (fundamental-mode) ; in the *PGP* buffer; nukes hooks!
		      (run-hooks 'nhooks)))))))
	(terminal-emulator buf
			   pgp-program
			   (nconc (list "-o" out-filename)
				  opt1
				  (list temp-filename)
				  opt2))))))

(defun pgp-frob-region  (min max &optional opt1 opt2)
  (pgp-frob-region-1 min max
		     (function
		      (lambda (out-filename buf)
			      (` (lambda () 
				   (pgp-continue-frob
				    (, out-filename)
				    (, buf))))))
		     opt1 opt2))

(defun pgp-frob-region-in-place (min max &optional opt1 opt2 cont)
  (let ((cur-buf (current-buffer)))
    (pgp-frob-region-1 min max 
		       (function
			(lambda (out-filename buf)
			  (` (lambda () 
			       (pgp-continue-in-place (, out-filename)
						      (, cur-buf)
						      (, min)
						      (, max)
						      (quote (, cont)))))))
		       opt1 opt2)))

(defun pgp-encrypt-ascii-region (min max to)
  (interactive "r\nsRecipient name: ")
  (pgp-frob-region min max (list "-eaw") (list to)))

(defun pgp-decrypt-ascii-region (min max)
  (interactive "r")
  (pgp-frob-region min max nil nil))

(defun pgp-sign-ascii-region (min max)
  "Sign the region with PGP, using cleartext signatures."
  (interactive "r")
  (pgp-frob-region min max (list "-swat") nil))

(defun pgp-encrypt-ascii-buffer (to)
  "Encrypt a buffer and use PGP armor for the output."
  (interactive "sRecipient name: ")
  (pgp-encrypt-ascii-region (point-min) (point-max) to))

(defun pgp-decrypt-ascii-buffer ()
  "Apply PGP to the current buffer."
  (interactive)
  (pgp-decrypt-ascii-region (point-min) (point-max)))

(defun pgp-sign-encrypt-ascii-buffer (to)
  (interactive "sRecipient name: ")
  (pgp-frob-region (point-min) (point-max) (list "-seaw") (list to)))

(defun pgp-sign-ascii-buffer ()
  "Sign the current buffer with PGP, using cleartext signatures."
  (interactive)
  (pgp-sign-ascii-region (point-min) (point-max)))

(defun pgp-sign-encrypt-ascii-buffer-in-place (to)
  (interactive "s(in place) Recipient name: ")
  (pgp-frob-region-in-place (point-min) (point-max) (list "-seaw") (list to)))

(defun pgp-sign-encrypt-ascii-region (min max to)
   (interactive "r\nsRecipient name: ")
   (pgp-frob-region min max (list "-seaw") (list to)))

(defvar pgp-mail-frob-flags "-easw"
  "*Flags to pass to pgp for frobbing mail.")

(defun pgp-frob-mail (to)
  "Take an in-progress mail message and 'frob' it."
  (interactive "sMail Recipient name: ")
  (goto-char (point-min))
  (re-search-forward mail-header-separator)
  (goto-char (match-beginning 0))
  (forward-line 1)
  (save-excursion
    (insert (buffer-substring (point-min) (point))))
  (pgp-frob-region-in-place (point) (point-max)
			    (list pgp-mail-frob-flags "-u" pgp-sender-name)
			    (list to)
			    'pgp-mail-continue))

(global-set-key "\C-c\C-p\C-e" 'pgp-encrypt-ascii-buffer)
(global-set-key "\C-c\C-p\C-r" 'pgp-encrypt-ascii-region)
(global-set-key "\C-c\C-p\C-s" 'pgp-sign-ascii-buffer)
(global-set-key "\C-c\C-p\C-m" 'pgp-frob-mail)
(global-set-key "\C-c\C-p\C-d" 'pgp-decrypt-ascii-buffer)

(global-set-key "\C-cpm" 'pgp-frob-mail)
(define-key rmail-mode-map "V" 'pgp-decrypt-ascii-buffer)

;;; How to deal with the race?  the sentinel may get called
;;; *before* terminal-emulator finishes its initialization.  So we set
;;; up a local variable here so that our terminal-mode-hook will undo
;;; the damage if PGP is finished.
;;
;; from terminal.el, modified:

(defun te-sentinel (process message)
  (cond ((eq (process-status process) 'run))
	((null (buffer-name (process-buffer process)))) ;deleted
	(t (let ((b (current-buffer))
		 (done-hooks (and	; added: WES
			      (boundp 'terminal-finished-hook)
			      terminal-finished-hook)))
	     (save-excursion
	       (set-buffer (process-buffer process))
	       (setq buffer-read-only nil)
	       (goto-char (point-max))
	       (delete-blank-lines)
	       (delete-horizontal-space)
	       (insert "\n*******\n" message "*******\n")
	       (fundamental-mode)	; added/moved: WES/JTK
	       (setq pgp-finished t)	; JTK
	       (sit-for 1))
	     (if (and (eq b (process-buffer process))
		      (waiting-for-user-input-p))
		 (progn (goto-char (point-max))
			(recenter -1)))
		 (run-hooks 'done-hooks))))) ;added: WES



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