Remove @footnote.

[elisp/epg.git] / epg-config.el

diff --git a/epg-config.el b/epg-config.el
index 0da6ea1..c5c5a7f 100644 (file)
--- a/epg-config.el
+++ b/epg-config.el
@@ -23,6 +23,8 @@
 
 ;;; Code:
 
+(require 'epg-package-info)
+
 (defgroup epg ()
   "The EasyPG Library"
   :group 'emacs)
@@ -38,53 +40,101 @@
   :type 'string)
 
 (defcustom epg-gpg-home-directory nil
-  "The directory which contains the `gpg' configuration files."
+  "The directory which contains the configuration files of `epg-gpg-program'."
   :group 'epg
   :type '(choice (const :tag "Default" nil) directory))
 
-(defconst epg-version-number "0.0.4")
+(defcustom epg-passphrase-coding-system nil
+  "Coding system to use with messages from `epg-gpg-program'."
+  :group 'epg
+  :type 'symbol)
+
+(defcustom epg-debug nil
+  "If non-nil, debug output goes to the \" *epg-debug*\" buffer.
+Note that the buffer name starts with a space."
+  :group 'epg
+  :type 'boolean)
+
+(defconst epg-gpg-minimum-version "1.4.3")
 
 ;;;###autoload
 (defun epg-configuration ()
   "Return a list of internal configuration parameters of `epg-gpg-program'."
-  (let (config type)
+  (let (config groups type args)
     (with-temp-buffer
       (apply #'call-process epg-gpg-program nil (list t nil) nil
-            '("--with-colons" "--list-config"))
+            (append (if epg-gpg-home-directory
+                        (list "--homedir" epg-gpg-home-directory))
+                    '("--with-colons" "--list-config")))
       (goto-char (point-min))
       (while (re-search-forward "^cfg:\\([^:]+\\):\\(.*\\)" nil t)
        (setq type (intern (match-string 1))
-             config (cons (cons type
-                                (if (memq type
-                                          '(pubkey cipher digest compress))
-                                    (mapcar #'string-to-number
-                                            (delete "" (split-string
-                                                        (match-string 2)
-                                                        ";")))
-                                  (match-string 2)))
-                          config))))
-    config))
+             args (match-string 2))
+       (cond
+        ((eq type 'group)
+         (if (string-match "\\`\\([^:]+\\):" args)
+                 (setq groups
+                       (cons (cons (downcase (match-string 1 args))
+                                   (delete "" (split-string
+                                               (substring args
+                                                          (match-end 0))
+                                               ";")))
+                             groups))
+           (if epg-debug
+               (message "Invalid group configuration: %S" args))))
+        ((memq type '(pubkey cipher digest compress))
+         (if (string-match "\\`\\([0-9]+\\)\\(;[0-9]+\\)*" args)
+             (setq config
+                   (cons (cons type
+                               (mapcar #'string-to-number
+                                       (delete "" (split-string args ";"))))
+                         config))
+           (if epg-debug
+               (message "Invalid %S algorithm configuration: %S"
+                        type args))))
+        (t
+         (setq config (cons (cons type args) config))))))
+    (if groups
+       (cons (cons 'groups groups) config)
+      config)))
+
+(defun epg-config--parse-version (string)
+  (let ((index 0)
+       version)
+    (while (eq index (string-match "\\([0-9]+\\)\\.?" string index))
+      (setq version (cons (string-to-number (match-string 1 string))
+                         version)
+           index (match-end 0)))
+    (nreverse version)))
+
+(defun epg-config--compare-version (v1 v2)
+  (while (and v1 v2 (= (car v1) (car v2)))
+    (setq v1 (cdr v1) v2 (cdr v2)))
+  (- (or (car v1) 0) (or (car v2) 0)))
 
 ;;;###autoload
-(defun epg-check-configuration (config)
-  "Verify that CONFIGURATION is sufficient."
+(defun epg-check-configuration (config &optional minimum-version)
+  "Verify that a sufficient version of GnuPG is installed."
   (let ((entry (assq 'version config))
-       major minor teeny)
+       version)
     (unless (and entry
-                (stringp (cdr entry))
-                (string-match "\\`\\([0-9]+\\)\\.\\([0-9]+\\)\\.\\([0-9]+\\)"
-                              (cdr entry)))
+                (stringp (cdr entry)))
       (error "Undetermined version: %S" entry))
-    (setq major (string-to-number (match-string 1 (cdr entry)))
-         minor (string-to-number (match-string 2 (cdr entry)))
-         teeny (string-to-number (match-string 3 (cdr entry))))
-    (unless (or (> major 1)
-               (and (= major 1)
-                    (or (> minor 4)
-                        (and (= minor 4)
-                             (>= teeny 3)))))
+    (setq version (epg-config--parse-version (cdr entry))
+         minimum-version (epg-config--parse-version
+                          (or minimum-version
+                              epg-gpg-minimum-version)))
+    (unless (>= (epg-config--compare-version version minimum-version) 0)
       (error "Unsupported version: %s" (cdr entry)))))
 
+;;;###autoload
+(defun epg-expand-group (config group)
+  "Look at CONFIG and try to expand GROUP."
+  (let ((entry (assq 'groups config)))
+    (if (and entry
+            (setq entry (assoc (downcase group) (cdr entry))))
+       (cdr entry))))
+
 (provide 'epg-config)
 
 ;;; epg-config.el ends here