mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-14 09:39:42 +00:00
280 lines
8.9 KiB
EmacsLisp
280 lines
8.9 KiB
EmacsLisp
;;; nnoo.el --- OO Gnus Backends
|
|
;; Copyright (C) 1996,97 Free Software Foundation, Inc.
|
|
|
|
;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
|
|
;; Keywords: news
|
|
|
|
;; 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 2, 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
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; 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.
|
|
|
|
;;; Commentary:
|
|
|
|
;;; Code:
|
|
|
|
(require 'nnheader)
|
|
(eval-when-compile (require 'cl))
|
|
|
|
(defvar nnoo-definition-alist nil)
|
|
(defvar nnoo-state-alist 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))
|
|
(nnoo-define ',var ',map)))
|
|
(put 'defvoo 'lisp-indent-function 2)
|
|
(put 'defvoo 'edebug-form-spec '(var init &optional doc &rest map))
|
|
|
|
(defmacro deffoo (func args &rest forms)
|
|
"The same as `defun', only register FUNC."
|
|
`(prog1
|
|
(defun ,func ,args ,@forms)
|
|
(nnoo-register-function ',func)))
|
|
(put 'deffoo 'lisp-indent-function 2)
|
|
(put 'deffoo 'edebug-form-spec '(&define name lambda-list def-body))
|
|
|
|
(defun nnoo-register-function (func)
|
|
(let ((funcs (nthcdr 3 (assoc (nnoo-backend func)
|
|
nnoo-definition-alist))))
|
|
(unless funcs
|
|
(error "%s belongs to a backend that hasn't been declared" func))
|
|
(setcar funcs (cons func (car funcs)))))
|
|
|
|
(defmacro nnoo-declare (backend &rest parents)
|
|
`(eval-and-compile
|
|
(push (list ',backend
|
|
(mapcar (lambda (p) (list p)) ',parents)
|
|
nil nil)
|
|
nnoo-definition-alist)
|
|
(push (list ',backend "*internal-non-initialized-backend*")
|
|
nnoo-state-alist)))
|
|
(put 'nnoo-declare 'lisp-indent-function 1)
|
|
|
|
(defun nnoo-parents (backend)
|
|
(nth 1 (assoc backend nnoo-definition-alist)))
|
|
|
|
(defun nnoo-variables (backend)
|
|
(nth 2 (assoc backend nnoo-definition-alist)))
|
|
|
|
(defun nnoo-functions (backend)
|
|
(nth 3 (assoc backend nnoo-definition-alist)))
|
|
|
|
(defmacro nnoo-import (backend &rest imports)
|
|
`(nnoo-import-1 ',backend ',imports))
|
|
(put 'nnoo-import 'lisp-indent-function 1)
|
|
|
|
(defun nnoo-import-1 (backend imports)
|
|
(let ((call-function
|
|
(if (symbolp (car imports)) (pop imports) 'nnoo-parent-function))
|
|
imp functions function)
|
|
(while (setq imp (pop imports))
|
|
(setq functions
|
|
(or (cdr imp)
|
|
(nnoo-functions (car imp))))
|
|
(while 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)
|
|
(cdr (assq pbackend (nnoo-parents backend))))
|
|
(apply function args)))
|
|
|
|
(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)
|
|
(cdr (assq pbackend (nnoo-parents backend))))
|
|
(apply function args)))
|
|
|
|
(defmacro nnoo-map-functions (backend &rest maps)
|
|
`(nnoo-map-functions-1 ',backend ',maps))
|
|
(put 'nnoo-map-functions 'lisp-indent-function 1)
|
|
|
|
(defun nnoo-map-functions-1 (backend maps)
|
|
(let (m margs i)
|
|
(while (setq m (pop maps))
|
|
(setq i 0
|
|
margs nil)
|
|
(while (< i (length (cdr m)))
|
|
(if (numberp (nth i (cdr m)))
|
|
(push `(nth ,i args) margs)
|
|
(push (nth i (cdr m)) margs))
|
|
(incf i))
|
|
(eval `(deffoo ,(nnoo-symbol backend (nnoo-rest-symbol (car m)))
|
|
(&rest args)
|
|
(nnoo-parent-function ',backend ',(car m)
|
|
,(cons 'list (nreverse margs))))))))
|
|
|
|
(defun nnoo-backend (symbol)
|
|
(string-match "^[^-]+-" (symbol-name symbol))
|
|
(intern (substring (symbol-name symbol) 0 (1- (match-end 0)))))
|
|
|
|
(defun nnoo-rest-symbol (symbol)
|
|
(string-match "^[^-]+-" (symbol-name symbol))
|
|
(intern (substring (symbol-name symbol) (match-end 0))))
|
|
|
|
(defun nnoo-symbol (backend symbol)
|
|
(intern (format "%s-%s" backend symbol)))
|
|
|
|
(defun nnoo-define (var map)
|
|
(let* ((backend (nnoo-backend var))
|
|
(def (assq backend nnoo-definition-alist))
|
|
(parents (nth 1 def)))
|
|
(unless def
|
|
(error "%s belongs to a backend that hasn't been declared" var))
|
|
(setcar (nthcdr 2 def)
|
|
(delq (assq var (nth 2 def)) (nth 2 def)))
|
|
(setcar (nthcdr 2 def)
|
|
(cons (cons var (symbol-value var))
|
|
(nth 2 def)))
|
|
(while map
|
|
(nconc (assq (nnoo-backend (car map)) parents)
|
|
(list (list (pop map) var))))))
|
|
|
|
(defun nnoo-change-server (backend server defs)
|
|
(let* ((bstate (cdr (assq backend nnoo-state-alist)))
|
|
(current (car bstate))
|
|
(parents (nnoo-parents backend))
|
|
(bvariables (nnoo-variables backend))
|
|
state def)
|
|
(unless bstate
|
|
(push (setq bstate (list backend nil))
|
|
nnoo-state-alist)
|
|
(pop bstate))
|
|
(if (equal server current)
|
|
t
|
|
(nnoo-push-server backend current)
|
|
(setq state (or (cdr (assoc server (cddr bstate)))
|
|
(nnoo-variables backend)))
|
|
(while state
|
|
(set (caar state) (cdar state))
|
|
(pop state))
|
|
(setcar bstate server)
|
|
(unless (cdr (assoc server (cddr bstate)))
|
|
(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))))
|
|
(while parents
|
|
(nnoo-change-server
|
|
(caar parents) server
|
|
(mapcar (lambda (def) (list (car def) (symbol-value (cadr def))))
|
|
(cdar parents)))
|
|
(pop parents))))
|
|
t)
|
|
|
|
(defun nnoo-push-server (backend current)
|
|
(let ((bstate (assq backend nnoo-state-alist))
|
|
(defs (nnoo-variables backend)))
|
|
;; Remove the old definition.
|
|
(setcdr (cdr bstate) (delq (assoc current (cddr bstate)) (cddr bstate)))
|
|
;; If this is the first time we push the server (i. e., this is
|
|
;; the nil server), then we update the default values of
|
|
;; all the variables to reflect the current values.
|
|
(when (equal current "*internal-non-initialized-backend*")
|
|
(let ((defaults (nnoo-variables backend))
|
|
def)
|
|
(while (setq def (pop defaults))
|
|
(setcdr def (symbol-value (car def))))))
|
|
(let (state)
|
|
(while defs
|
|
(push (cons (caar defs) (symbol-value (caar defs)))
|
|
state)
|
|
(pop defs))
|
|
(nconc bstate (list (cons current state))))))
|
|
|
|
(defsubst nnoo-current-server-p (backend server)
|
|
(equal (nnoo-current-server backend) server))
|
|
|
|
(defun nnoo-current-server (backend)
|
|
(nth 1 (assq backend nnoo-state-alist)))
|
|
|
|
(defun nnoo-close-server (backend &optional server)
|
|
(unless server
|
|
(setq server (nnoo-current-server backend)))
|
|
(when server
|
|
(let* ((bstate (cdr (assq backend nnoo-state-alist)))
|
|
(defs (assoc server (cdr bstate))))
|
|
(when bstate
|
|
(setcar bstate nil)
|
|
(setcdr bstate (delq defs (cdr bstate)))
|
|
(pop defs)
|
|
(while defs
|
|
(set (car (pop defs)) nil)))))
|
|
t)
|
|
|
|
(defun nnoo-close (backend)
|
|
(setq nnoo-state-alist
|
|
(delq (assq backend nnoo-state-alist)
|
|
nnoo-state-alist))
|
|
t)
|
|
|
|
(defun nnoo-status-message (backend server)
|
|
(nnheader-get-report backend))
|
|
|
|
(defun nnoo-server-opened (backend server)
|
|
(and (nnoo-current-server-p backend server)
|
|
nntp-server-buffer
|
|
(buffer-name nntp-server-buffer)))
|
|
|
|
(defmacro nnoo-define-basics (backend)
|
|
"Define `close-server', `server-opened' and `status-message'."
|
|
`(eval-and-compile
|
|
(nnoo-define-basics-1 ',backend)))
|
|
|
|
(defun nnoo-define-basics-1 (backend)
|
|
(let ((functions '(close-server server-opened status-message)))
|
|
(while functions
|
|
(eval `(deffoo ,(nnoo-symbol backend (car functions))
|
|
(&optional server)
|
|
(,(nnoo-symbol 'nnoo (pop functions)) ',backend server)))))
|
|
(eval `(deffoo ,(nnoo-symbol backend 'open-server)
|
|
(server &optional defs)
|
|
(nnoo-change-server ',backend server defs))))
|
|
|
|
(defmacro nnoo-define-skeleton (backend)
|
|
"Define all required backend functions for BACKEND.
|
|
All functions will return nil and report an error."
|
|
`(eval-and-compile
|
|
(nnoo-define-skeleton-1 ',backend)))
|
|
|
|
(defun nnoo-define-skeleton-1 (backend)
|
|
(let ((functions '(retrieve-headers
|
|
request-close request-article
|
|
request-group close-group
|
|
request-list request-post request-list-newsgroups))
|
|
function fun)
|
|
(while (setq function (pop functions))
|
|
(when (not (fboundp (setq fun (nnoo-symbol backend function))))
|
|
(eval `(deffoo ,fun
|
|
(&rest args)
|
|
(nnheader-report ',backend ,(format "%s-%s not implemented"
|
|
backend function))))))))
|
|
(provide 'nnoo)
|
|
|
|
;;; nnoo.el ends here.
|