;;; nnoo.el --- OO Gnus Backends
-;; Copyright (C) 1996,97 Free Software Foundation, Inc.
+;; Copyright (C) 1996,97,98 Free Software Foundation, Inc.
-;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: news
;; This file is part of GNU Emacs.
;;; Code:
(require 'nnheader)
-(require 'cl)
+(eval-when-compile (require 'cl))
(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."
(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))
(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)
(nconc bvariables
(list (cons (car def) (and (boundp (car def))
(symbol-value (car def)))))))
- (set (car def) (cadr 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))))
(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)))