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1 ;;; nnoo.el --- OO Gnus Backends
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2 ;; Copyright (C) 1996 Free Software Foundation, Inc.
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4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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5 ;; Keywords: news
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6
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7 ;; This file is part of GNU Emacs.
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8
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9 ;; GNU Emacs is free software; you can redistribute it and/or modify
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10 ;; it under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; GNU Emacs is distributed in the hope that it will be useful,
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15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 ;; GNU General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Commentary:
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25
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26 ;;; Code:
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27
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70
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28 (eval-when-compile (require 'cl))
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29
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30 (defvar nnoo-definition-alist nil)
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31 (defvar nnoo-state-alist nil)
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32
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33 (defmacro defvoo (var init &optional doc &rest map)
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34 "The same as `defvar', only takes list of variables to MAP to."
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35 `(prog1
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36 ,(if doc
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37 `(defvar ,var ,init ,doc)
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38 `(defvar ,var ,init))
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39 (nnoo-define ',var ',map)))
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40 (put 'defvoo 'lisp-indent-function 2)
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70
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41 (put 'defvoo 'lisp-indent-hook 2)
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42 (put 'defvoo 'edebug-form-spec '(var init &optional doc &rest map))
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43
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44 (defmacro deffoo (func args &rest forms)
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45 "The same as `defun', only register FUNC."
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46 `(prog1
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47 (defun ,func ,args ,@forms)
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48 (nnoo-register-function ',func)))
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49 (put 'deffoo 'lisp-indent-function 2)
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70
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50 (put 'deffoo 'lisp-indent-hook 2)
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51 (put 'deffoo 'edebug-form-spec '(&define name lambda-list def-body))
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52
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53 (defun nnoo-register-function (func)
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54 (let ((funcs (nthcdr 3 (assoc (nnoo-backend func)
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55 nnoo-definition-alist))))
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56 (unless funcs
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57 (error "%s belongs to a backend that hasn't been declared" func))
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58 (setcar funcs (cons func (car funcs)))))
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59
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60 (defmacro nnoo-declare (backend &rest parents)
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61 `(eval-and-compile
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62 (push (list ',backend
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63 (mapcar (lambda (p) (list p)) ',parents)
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64 nil nil)
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65 nnoo-definition-alist)))
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66 (put 'nnoo-declare 'lisp-indent-function 1)
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70
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67 (put 'nnoo-declare 'lisp-indent-hook 1)
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68
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69 (defun nnoo-parents (backend)
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70 (nth 1 (assoc backend nnoo-definition-alist)))
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71
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72 (defun nnoo-variables (backend)
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73 (nth 2 (assoc backend nnoo-definition-alist)))
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74
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75 (defun nnoo-functions (backend)
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76 (nth 3 (assoc backend nnoo-definition-alist)))
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77
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78 (defmacro nnoo-import (backend &rest imports)
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79 `(nnoo-import-1 ',backend ',imports))
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80 (put 'nnoo-import 'lisp-indent-function 1)
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81 (put 'nnoo-import 'lisp-indent-hook 1)
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82
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83 (defun nnoo-import-1 (backend imports)
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84 (let ((call-function
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85 (if (symbolp (car imports)) (pop imports) 'nnoo-parent-function))
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86 imp functions function)
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87 (while (setq imp (pop imports))
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88 (setq functions
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89 (or (cdr imp)
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90 (nnoo-functions (car imp))))
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91 (while functions
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92 (unless (fboundp (setq function
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93 (nnoo-symbol backend (nnoo-rest-symbol
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94 (car functions)))))
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95 (eval `(deffoo ,function (&rest args)
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96 (,call-function ',backend ',(car functions) args))))
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97 (pop functions)))))
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98
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99 (defun nnoo-parent-function (backend function args)
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100 (let* ((pbackend (nnoo-backend function)))
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101 (nnoo-change-server pbackend (nnoo-current-server backend)
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102 (cdr (assq pbackend (nnoo-parents backend))))
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103 (apply function args)))
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104
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105 (defun nnoo-execute (backend function &rest args)
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106 "Execute FUNCTION on behalf of BACKEND."
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107 (let* ((pbackend (nnoo-backend function)))
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108 (nnoo-change-server pbackend (nnoo-current-server backend)
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109 (cdr (assq pbackend (nnoo-parents backend))))
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110 (apply function args)))
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111
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112 (defmacro nnoo-map-functions (backend &rest maps)
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113 `(nnoo-map-functions-1 ',backend ',maps))
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114 (put 'nnoo-map-functions 'lisp-indent-function 1)
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115 (put 'nnoo-map-functions 'lisp-indent-hook 1)
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116
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117 (defun nnoo-map-functions-1 (backend maps)
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118 (let (m margs i)
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119 (while (setq m (pop maps))
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120 (setq i 0
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121 margs nil)
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122 (while (< i (length (cdr m)))
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123 (if (numberp (nth i (cdr m)))
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124 (push `(nth ,i args) margs)
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125 (push (nth i (cdr m)) margs))
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126 (incf i))
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127 (eval `(deffoo ,(nnoo-symbol backend (nnoo-rest-symbol (car m)))
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128 (&rest args)
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129 (nnoo-parent-function ',backend ',(car m)
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130 ,(cons 'list (nreverse margs))))))))
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131
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132 (defun nnoo-backend (symbol)
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133 (string-match "^[^-]+-" (symbol-name symbol))
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134 (intern (substring (symbol-name symbol) 0 (1- (match-end 0)))))
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135
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136 (defun nnoo-rest-symbol (symbol)
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137 (string-match "^[^-]+-" (symbol-name symbol))
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138 (intern (substring (symbol-name symbol) (match-end 0))))
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139
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140 (defun nnoo-symbol (backend symbol)
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141 (intern (format "%s-%s" backend symbol)))
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142
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143 (defun nnoo-define (var map)
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144 (let* ((backend (nnoo-backend var))
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145 (def (assq backend nnoo-definition-alist))
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146 (parents (nth 1 def)))
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147 (unless def
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148 (error "%s belongs to a backend that hasn't been declared." var))
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149 (setcar (nthcdr 2 def)
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150 (delq (assq var (nth 2 def)) (nth 2 def)))
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151 (setcar (nthcdr 2 def)
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152 (cons (cons var (symbol-value var))
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153 (nth 2 def)))
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154 (while map
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155 (nconc (assq (nnoo-backend (car map)) parents)
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156 (list (list (pop map) var))))))
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157
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158 (defun nnoo-change-server (backend server defs)
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159 (let* ((bstate (cdr (assq backend nnoo-state-alist)))
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160 (sdefs (assq backend nnoo-definition-alist))
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161 (current (car bstate))
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162 (parents (nnoo-parents backend))
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163 state)
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164 (unless bstate
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165 (push (setq bstate (list backend nil))
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166 nnoo-state-alist)
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167 (pop bstate))
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168 (if (equal server current)
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169 t
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170 (nnoo-push-server backend current)
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171 (setq state (or (cdr (assoc server (cddr bstate)))
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172 (nnoo-variables backend)))
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173 (while state
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174 (set (caar state) (cdar state))
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175 (pop state))
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176 (setcar bstate server)
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177 (unless (cdr (assoc server (cddr bstate)))
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178 (while defs
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179 (set (caar defs) (cadar defs))
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180 (pop defs)))
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181 (while parents
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182 (nnoo-change-server
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183 (caar parents) server
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184 (mapcar (lambda (def) (list (car def) (symbol-value (cadr def))))
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185 (cdar parents)))
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186 (pop parents))))
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187 t)
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188
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189 (defun nnoo-push-server (backend current)
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190 (let ((bstate (assq backend nnoo-state-alist))
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191 (defs (nnoo-variables backend)))
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192 ;; Remove the old definition.
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193 (setcdr (cdr bstate) (delq (assoc current (cddr bstate)) (cddr bstate)))
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194 (let (state)
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195 (while defs
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196 (push (cons (caar defs) (symbol-value (caar defs)))
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197 state)
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198 (pop defs))
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199 (nconc bstate (list (cons current state))))))
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200
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201 (defun nnoo-current-server-p (backend server)
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202 (equal (nnoo-current-server backend) server))
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203
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204 (defun nnoo-current-server (backend)
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205 (nth 1 (assq backend nnoo-state-alist)))
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206
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207 (defun nnoo-close-server (backend &optional server)
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208 (unless server
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209 (setq server (nnoo-current-server backend)))
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210 (when server
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211 (let* ((bstate (cdr (assq backend nnoo-state-alist)))
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212 (defs (assoc server (cdr bstate))))
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213 (when bstate
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214 (setcar bstate nil)
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215 (setcdr bstate (delq defs (cdr bstate)))
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216 (pop defs)
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217 (while defs
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218 (set (car (pop defs)) nil)))))
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219 t)
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220
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221 (defun nnoo-close (backend)
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222 (setq nnoo-state-alist
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223 (delq (assq backend nnoo-state-alist)
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224 nnoo-state-alist))
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225 t)
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226
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227 (defun nnoo-status-message (backend server)
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228 (nnheader-get-report backend))
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229
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230 (defun nnoo-server-opened (backend server)
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231 (and (nnoo-current-server-p backend server)
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232 nntp-server-buffer
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233 (buffer-name nntp-server-buffer)))
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234
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235 (defmacro nnoo-define-basics (backend)
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236 `(eval-and-compile
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237 (nnoo-define-basics-1 ',backend)))
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238
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239 (defun nnoo-define-basics-1 (backend)
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240 (let ((functions '(close-server server-opened status-message)))
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241 (while functions
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242 (eval `(deffoo ,(nnoo-symbol backend (car functions))
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243 (&optional server)
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244 (,(nnoo-symbol 'nnoo (pop functions)) ',backend server)))))
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245 (eval `(deffoo ,(nnoo-symbol backend 'open-server)
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246 (server &optional defs)
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247 (nnoo-change-server ',backend server defs))))
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248
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249 (provide 'nnoo)
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250
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251 ;;; nnoo.el ends here.
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