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1 ;;; gnus-demon.el --- daemonic Gnus behaviour
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2 ;; Copyright (C) 1995,96,97 Free Software Foundation, Inc.
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3
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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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28 (require 'gnus)
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29 (require 'gnus-int)
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30 (require 'nnheader)
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31 (eval-and-compile
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32 (if (string-match "XEmacs" (emacs-version))
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33 (require 'itimer)
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34 (require 'timer)))
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35
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36 (defgroup gnus-demon nil
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37 "Demonic behaviour."
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38 :group 'gnus)
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39
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40 (defcustom gnus-demon-handlers nil
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41 "Alist of daemonic handlers to be run at intervals.
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42 Each handler is a list on the form
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43
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44 \(FUNCTION TIME IDLE)
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45
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46 FUNCTION is the function to be called.
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47 TIME is the number of `gnus-demon-timestep's between each call.
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48 If nil, never call. If t, call each `gnus-demon-timestep'.
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49 If IDLE is t, only call if Emacs has been idle for a while. If IDLE
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50 is a number, only call when Emacs has been idle more than this number
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51 of `gnus-demon-timestep's. If IDLE is nil, don't care about
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52 idleness. If IDLE is a number and TIME is nil, then call once each
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53 time Emacs has been idle for IDLE `gnus-demon-timestep's."
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54 :group 'gnus-demon
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55 :type '(repeat (list function
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56 (choice :tag "Time"
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57 (const :tag "never" nil)
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58 (const :tag "one" t)
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59 (integer :tag "steps" 1))
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60 (choice :tag "Idle"
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61 (const :tag "don't care" nil)
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62 (const :tag "for a while" t)
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63 (integer :tag "steps" 1)))))
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64
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65 (defcustom gnus-demon-timestep 60
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66 "*Number of seconds in each demon timestep."
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67 :group 'gnus-demon
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68 :type 'integer)
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69
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70 ;;; Internal variables.
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71
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72 (defvar gnus-demon-timer nil)
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73 (defvar gnus-demon-idle-has-been-called nil)
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74 (defvar gnus-demon-idle-time 0)
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75 (defvar gnus-demon-handler-state nil)
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76 (defvar gnus-demon-last-keys nil)
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77
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78 (eval-and-compile
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79 (autoload 'timezone-parse-date "timezone")
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80 (autoload 'timezone-make-arpa-date "timezone"))
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81
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82 ;;; Functions.
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83
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84 (defun gnus-demon-add-handler (function time idle)
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85 "Add the handler FUNCTION to be run at TIME and IDLE."
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86 ;; First remove any old handlers that use this function.
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87 (gnus-demon-remove-handler function)
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88 ;; Then add the new one.
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89 (push (list function time idle) gnus-demon-handlers)
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90 (gnus-demon-init))
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91
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92 (defun gnus-demon-remove-handler (function &optional no-init)
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93 "Remove the handler FUNCTION from the list of handlers."
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94 (setq gnus-demon-handlers
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95 (delq (assq function gnus-demon-handlers)
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96 gnus-demon-handlers))
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97 (unless no-init
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98 (gnus-demon-init)))
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99
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100 (defun gnus-demon-init ()
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101 "Initialize the Gnus daemon."
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102 (interactive)
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103 (gnus-demon-cancel)
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104 (if (null gnus-demon-handlers)
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105 () ; Nothing to do.
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106 ;; Set up timer.
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107 (setq gnus-demon-timer
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108 (nnheader-run-at-time
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109 gnus-demon-timestep gnus-demon-timestep 'gnus-demon))
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110 ;; Reset control variables.
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111 (setq gnus-demon-handler-state
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112 (mapcar
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113 (lambda (handler)
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114 (list (car handler) (gnus-demon-time-to-step (nth 1 handler))
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115 (nth 2 handler)))
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116 gnus-demon-handlers))
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117 (setq gnus-demon-idle-time 0)
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118 (setq gnus-demon-idle-has-been-called nil)
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119 (setq gnus-use-demon t)))
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120
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121 (gnus-add-shutdown 'gnus-demon-cancel 'gnus)
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122
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123 (defun gnus-demon-cancel ()
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124 "Cancel any Gnus daemons."
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125 (interactive)
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126 (when gnus-demon-timer
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127 (nnheader-cancel-timer gnus-demon-timer))
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128 (setq gnus-demon-timer nil
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129 gnus-use-demon nil)
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130 (condition-case ()
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131 (nnheader-cancel-function-timers 'gnus-demon)
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132 (error t)))
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133
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134 (defun gnus-demon-is-idle-p ()
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135 "Whether Emacs is idle or not."
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136 ;; We do this simply by comparing the 100 most recent keystrokes
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137 ;; with the ones we had last time. If they are the same, one might
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138 ;; guess that Emacs is indeed idle. This only makes sense if one
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139 ;; calls this function seldom -- like once a minute, which is what
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140 ;; we do here.
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141 (let ((keys (recent-keys)))
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142 (or (equal keys gnus-demon-last-keys)
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143 (progn
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144 (setq gnus-demon-last-keys keys)
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145 nil))))
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146
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147 (defun gnus-demon-time-to-step (time)
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148 "Find out how many seconds to TIME, which is on the form \"17:43\"."
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149 (if (not (stringp time))
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150 time
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151 (let* ((date (current-time-string))
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152 (dv (timezone-parse-date date))
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153 (tdate (timezone-make-arpa-date
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154 (string-to-number (aref dv 0))
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155 (string-to-number (aref dv 1))
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156 (string-to-number (aref dv 2)) time
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157 (or (aref dv 4) "UT")))
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158 (nseconds (gnus-time-minus
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159 (gnus-encode-date tdate) (gnus-encode-date date))))
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160 (round
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161 (/ (+ (if (< (car nseconds) 0)
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162 86400 0)
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163 (* 65536 (car nseconds))
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164 (nth 1 nseconds))
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165 gnus-demon-timestep)))))
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166
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167 (defun gnus-demon ()
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168 "The Gnus daemon that takes care of running all Gnus handlers."
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169 ;; Increase or reset the time Emacs has been idle.
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170 (if (gnus-demon-is-idle-p)
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171 (incf gnus-demon-idle-time)
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172 (setq gnus-demon-idle-time 0)
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173 (setq gnus-demon-idle-has-been-called nil))
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174 ;; Disable all daemonic stuff if we're in the minibuffer
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175 (unless (window-minibuffer-p (selected-window))
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176 ;; Then we go through all the handler and call those that are
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177 ;; sufficiently ripe.
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178 (let ((handlers gnus-demon-handler-state)
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179 handler time idle)
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180 (while handlers
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181 (setq handler (pop handlers))
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182 (cond
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183 ((numberp (setq time (nth 1 handler)))
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184 ;; These handlers use a regular timeout mechanism. We decrease
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185 ;; the timer if it hasn't reached zero yet.
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186 (unless (zerop time)
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187 (setcar (nthcdr 1 handler) (decf time)))
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188 (and (zerop time) ; If the timer now is zero...
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189 ;; Test for appropriate idleness
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190 (progn
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191 (setq idle (nth 2 handler))
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192 (cond
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193 ((null idle) t) ; Don't care about idle.
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194 ((numberp idle) ; Numerical idle...
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195 (< idle gnus-demon-idle-time)) ; Idle timed out.
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196 (t (< 0 gnus-demon-idle-time)))) ; Or just need to be idle.
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197 ;; So we call the handler.
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198 (progn
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199 (funcall (car handler))
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200 ;; And reset the timer.
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201 (setcar (nthcdr 1 handler)
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202 (gnus-demon-time-to-step
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203 (nth 1 (assq (car handler) gnus-demon-handlers)))))))
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204 ;; These are only supposed to be called when Emacs is idle.
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205 ((null (setq idle (nth 2 handler)))
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206 ;; We do nothing.
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207 )
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208 ((not (numberp idle))
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209 ;; We want to call this handler each and every time that
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210 ;; Emacs is idle.
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211 (funcall (car handler)))
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212 (t
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213 ;; We want to call this handler only if Emacs has been idle
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214 ;; for a specified number of timesteps.
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215 (and (not (memq (car handler) gnus-demon-idle-has-been-called))
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216 (< idle gnus-demon-idle-time)
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217 (progn
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218 (funcall (car handler))
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219 ;; Make sure the handler won't be called once more in
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220 ;; this idle-cycle.
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221 (push (car handler) gnus-demon-idle-has-been-called)))))))))
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222
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223 (defun gnus-demon-add-nocem ()
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224 "Add daemonic NoCeM handling to Gnus."
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225 (gnus-demon-add-handler 'gnus-demon-scan-nocem 60 t))
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226
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227 (defun gnus-demon-scan-nocem ()
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228 "Scan NoCeM groups for NoCeM messages."
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229 (save-window-excursion
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230 (gnus-nocem-scan-groups)))
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231
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232 (defun gnus-demon-add-disconnection ()
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233 "Add daemonic server disconnection to Gnus."
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234 (gnus-demon-add-handler 'gnus-demon-close-connections nil 30))
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235
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236 (defun gnus-demon-close-connections ()
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237 (save-window-excursion
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238 (gnus-close-backends)))
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239
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240 (defun gnus-demon-add-scanmail ()
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241 "Add daemonic scanning of mail from the mail backends."
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242 (gnus-demon-add-handler 'gnus-demon-scan-mail 120 60))
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243
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244 (defun gnus-demon-scan-mail ()
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245 (save-window-excursion
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246 (let ((servers gnus-opened-servers)
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247 server)
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248 (while (setq server (car (pop servers)))
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249 (and (gnus-check-backend-function 'request-scan (car server))
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250 (or (gnus-server-opened server)
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251 (gnus-open-server server))
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252 (gnus-request-scan nil server))))))
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253
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254 (defun gnus-demon-add-rescan ()
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255 "Add daemonic scanning of new articles from all backends."
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256 (gnus-demon-add-handler 'gnus-demon-scan-news 120 60))
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257
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258 (defun gnus-demon-scan-news ()
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259 (save-window-excursion
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260 (when (gnus-alive-p)
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261 (save-excursion
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262 (set-buffer gnus-group-buffer)
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263 (gnus-group-get-new-news)))))
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264
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265 (defun gnus-demon-add-scan-timestamps ()
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266 "Add daemonic updating of timestamps in empty newgroups."
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267 (gnus-demon-add-handler 'gnus-demon-scan-timestamps nil 30))
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268
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269 (defun gnus-demon-scan-timestamps ()
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270 "Set the timestamp on all newsgroups with no unread and no ticked articles."
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271 (when (gnus-alive-p)
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272 (let ((cur-time (current-time))
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273 (newsrc (cdr gnus-newsrc-alist))
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274 info group unread has-ticked)
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275 (while (setq info (pop newsrc))
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276 (setq group (gnus-info-group info)
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277 unread (gnus-group-unread group)
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278 has-ticked (cdr (assq 'tick (gnus-info-marks info))))
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279 (when (and (numberp unread)
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280 (= unread 0)
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281 (not has-ticked))
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282 (gnus-group-set-parameter group 'timestamp cur-time))))))
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283
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284 (provide 'gnus-demon)
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285
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286 ;;; gnus-demon.el ends here
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