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;;; epa-hook.el --- preloaded code to enable epa-file.el -*- lexical-binding: t -*-
;; Copyright (C) 2006-2015 Free Software Foundation, Inc.
;; Author: Daiki Ueno <>
;; Keywords: PGP, GnuPG
;; Package: emacs
;; This file is part of GNU Emacs.
;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <>.
;;; Code:
(defgroup epa-file nil
"The EasyPG Assistant hooks for transparent file encryption"
:version "23.1"
:group 'epa)
(defun epa-file--file-name-regexp-set (variable value)
(set-default variable value)
(if (fboundp 'epa-file-name-regexp-update)
(defcustom epa-file-name-regexp (purecopy "\\.gpg\\(~\\|\\.~[0-9]+~\\)?\\'")
"Regexp which matches filenames to be encrypted with GnuPG.
If you set this outside Custom while epa-file is already enabled, you
have to call `epa-file-name-regexp-update' after setting it to
properly update file-name-handler-alist. Setting this through Custom
does that automatically."
:type 'regexp
:group 'epa-file
:set 'epa-file--file-name-regexp-set)
(defcustom epa-file-inhibit-auto-save t
"If non-nil, disable auto-saving when opening an encrypted file."
:type 'boolean
:group 'epa-file)
(defvar epa-file-encrypt-to nil
"Recipient(s) used for encrypting files.
May either be a string or a list of strings.")
(put 'epa-file-encrypt-to 'safe-local-variable
#'(lambda (val)
(or (stringp val)
(and (listp val)
(catch 'safe
(mapc (lambda (elt)
(unless (stringp elt)
(throw 'safe nil)))
(put 'epa-file-encrypt-to 'permanent-local t)
(defvar epa-file-handler
(cons epa-file-name-regexp 'epa-file-handler))
(defvar epa-file-auto-mode-alist-entry
(list epa-file-name-regexp nil 'epa-file))
(defun epa-file-name-regexp-update ()
(unless (equal (car epa-file-handler) epa-file-name-regexp)
(setcar epa-file-handler epa-file-name-regexp)))
(defun epa-file-find-file-hook ()
(if (and buffer-file-name
(string-match epa-file-name-regexp buffer-file-name)
(auto-save-mode 0)))
(define-minor-mode auto-encryption-mode
"Toggle automatic file encryption/decryption (Auto Encryption mode).
With a prefix argument ARG, enable Auto Encryption mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil."
:global t :init-value t :group 'epa-file :version "23.1"
;; We'd like to use custom-initialize-set here so the setup is done
;; before dumping, but at the point where the defcustom is evaluated,
;; the corresponding function isn't defined yet, so
;; custom-initialize-set signals an error.
:initialize 'custom-initialize-delay
(setq file-name-handler-alist
(delq epa-file-handler file-name-handler-alist))
(remove-hook 'find-file-hooks 'epa-file-find-file-hook)
(setq auto-mode-alist (delq epa-file-auto-mode-alist-entry
(when auto-encryption-mode
(setq file-name-handler-alist
(cons epa-file-handler file-name-handler-alist))
(add-hook 'find-file-hook 'epa-file-find-file-hook)
(setq auto-mode-alist (cons epa-file-auto-mode-alist-entry
(put 'epa-file-handler 'safe-magic t)
(put 'epa-file-handler 'operations '(write-region insert-file-contents))
(provide 'epa-hook)
;;; epa-hook.el ends here
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