Revision: miles@gnu.org--gnu-2005/gnus--devo--0--patch-182

[gnus] / lisp / nnoo.el

diff --git a/lisp/nnoo.el b/lisp/nnoo.el
index 251fdc9..fcd50c3 100644 (file)
--- a/lisp/nnoo.el
+++ b/lisp/nnoo.el
@@ -1,7 +1,9 @@
 ;;; nnoo.el --- OO Gnus Backends
-;; Copyright (C) 1996,97 Free Software Foundation, Inc.
 
-;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
+;;   2004, 2005 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: news
 
 ;; This file is part of GNU Emacs.
@@ -18,8 +20,8 @@
 
 ;; 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, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Commentary:
 
@@ -30,12 +32,13 @@
 
 (defvar nnoo-definition-alist nil)
 (defvar nnoo-state-alist nil)
+(defvar nnoo-parent-backend nil)
 
 (defmacro defvoo (var init &optional doc &rest map)
   "The same as `defvar', only takes list of variables to MAP to."
   `(prog1
        ,(if doc
-           `(defvar ,var ,init ,doc)
+           `(defvar ,var ,init ,(concat doc "\n\nThis is a Gnus server variable.  See Info node `(gnus)Select Methods'."))
          `(defvar ,var ,init))
      (nnoo-define ',var ',map)))
 (put 'defvoo 'lisp-indent-function 2)
@@ -88,25 +91,42 @@
            (or (cdr imp)
                (nnoo-functions (car imp))))
       (while functions
-       (unless (fboundp (setq function
-                              (nnoo-symbol backend (nnoo-rest-symbol
-                                                    (car functions)))))
+       (unless (fboundp
+                (setq function
+                      (nnoo-symbol backend
+                                   (nnoo-rest-symbol (car functions)))))
          (eval `(deffoo ,function (&rest args)
                   (,call-function ',backend ',(car functions) args))))
        (pop functions)))))
 
 (defun nnoo-parent-function (backend function args)
-  (let ((pbackend (nnoo-backend function)))
-    (nnoo-change-server pbackend (nnoo-current-server backend)
+  (let ((pbackend (nnoo-backend function))
+       (nnoo-parent-backend backend))
+    (nnoo-change-server pbackend
+                       (nnoo-current-server backend)
                        (cdr (assq pbackend (nnoo-parents backend))))
-    (apply function args)))
+    (prog1
+       (apply function args)
+      ;; Copy the changed variables back into the child.
+      (let ((vars (cdr (assq pbackend (nnoo-parents backend)))))
+       (while vars
+         (set (cadar vars) (symbol-value (caar vars)))
+         (setq vars (cdr vars)))))))
 
 (defun nnoo-execute (backend function &rest args)
   "Execute FUNCTION on behalf of BACKEND."
-  (let ((pbackend (nnoo-backend function)))
-    (nnoo-change-server pbackend (nnoo-current-server backend)
+  (let ((pbackend (nnoo-backend function))
+       (nnoo-parent-backend backend))
+    (nnoo-change-server pbackend
+                       (nnoo-current-server backend)
                        (cdr (assq pbackend (nnoo-parents backend))))
-    (apply function args)))
+    (prog1
+       (apply function args)
+      ;; Copy the changed variables back into the child.
+      (let ((vars (cdr (assq pbackend (nnoo-parents backend)))))
+       (while vars
+         (set (cadar vars) (symbol-value (caar vars)))
+         (setq vars (cdr vars)))))))
 
 (defmacro nnoo-map-functions (backend &rest maps)
   `(nnoo-map-functions-1 ',backend ',maps))
@@ -157,8 +177,13 @@
   (let* ((bstate (cdr (assq backend nnoo-state-alist)))
         (current (car bstate))
         (parents (nnoo-parents backend))
+        (server (if nnoo-parent-backend
+                    (format "%s+%s" nnoo-parent-backend server)
+                  server))
         (bvariables (nnoo-variables backend))
         state def)
+    ;; If we don't have a current state, we push an empty state
+    ;; onto the alist.
     (unless bstate
       (push (setq bstate (list backend nil))
            nnoo-state-alist)
@@ -176,12 +201,14 @@
        (while (setq def (pop defs))
          (unless (assq (car def) bvariables)
            (nconc bvariables
-                  (list (cons (car def) (and (boundp (car def))
-                                             (symbol-value (car def)))))))
-         (set (car def) (cadr def))))
+                  (list (cons (car def) (and (boundp (car def))
+                                             (symbol-value (car def)))))))
+         (if (equal server "*internal-non-initialized-backend*")
+             (set (car def) (symbol-value (cadr def)))
+           (set (car def) (cadr def)))))
       (while parents
        (nnoo-change-server
-        (caar parents) server
+        (caar parents) (format "%s+%s" backend server)
         (mapcar (lambda (def) (list (car def) (symbol-value (cadr def))))
                 (cdar parents)))
        (pop parents))))
@@ -208,7 +235,10 @@
       (nconc bstate (list (cons current state))))))
 
 (defsubst nnoo-current-server-p (backend server)
-  (equal (nnoo-current-server backend) server))
+  (equal (nnoo-current-server backend)
+        (if nnoo-parent-backend
+            (format "%s+%s" nnoo-parent-backend server)
+          server)))
 
 (defun nnoo-current-server (backend)
   (nth 1 (assq backend nnoo-state-alist)))
@@ -274,6 +304,21 @@ All functions will return nil and report an error."
                   (&rest args)
                 (nnheader-report ',backend ,(format "%s-%s not implemented"
                                                     backend function))))))))
+
+(defun nnoo-set (server &rest args)
+  (let ((parents (nnoo-parents (car server)))
+       (nnoo-parent-backend (car server)))
+    (while parents
+      (nnoo-change-server (caar parents)
+                         (cadr server)
+                         (cdar parents))
+      (pop parents)))
+  (nnoo-change-server (car server)
+                     (cadr server) (cddr server))
+  (while args
+    (set (pop args) (pop args))))
+
 (provide 'nnoo)
 
-;;; nnoo.el ends here.
+;;; arch-tag: 0196b5ed-6f34-4778-a455-73a971f837e7
+;;; nnoo.el ends here