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1 ;;; gnus-demon.el --- daemonic Gnus behaviour
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2 ;; Copyright (C) 1995,96 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
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30 (eval-when-compile (require 'cl))
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31
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32 (defvar gnus-demon-handlers nil
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33 "Alist of daemonic handlers to be run at intervals.
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34 Each handler is a list on the form
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35
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36 \(FUNCTION TIME IDLE)
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37
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38 FUNCTION is the function to be called.
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39 TIME is the number of `gnus-demon-timestep's between each call.
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40 If nil, never call. If t, call each `gnus-demon-timestep'.
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41 If IDLE is t, only call if Emacs has been idle for a while. If IDLE
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42 is a number, only call when Emacs has been idle more than this number
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43 of `gnus-demon-timestep's. If IDLE is nil, don't care about
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44 idleness. If IDLE is a number and TIME is nil, then call once each
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45 time Emacs has been idle for IDLE `gnus-demon-timestep's.")
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46
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47 (defvar gnus-demon-timestep 60
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48 "*Number of seconds in each demon timestep.")
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49
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50 ;;; Internal variables.
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51
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52 (defvar gnus-demon-timer nil)
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53 (defvar gnus-demon-idle-has-been-called nil)
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54 (defvar gnus-demon-idle-time 0)
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55 (defvar gnus-demon-handler-state nil)
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56 (defvar gnus-demon-is-idle nil)
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57 (defvar gnus-demon-last-keys nil)
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58
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59 (eval-and-compile
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60 (autoload 'timezone-parse-date "timezone")
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61 (autoload 'timezone-make-arpa-date "timezone"))
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62
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63 ;;; Functions.
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64
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65 (defun gnus-demon-add-handler (function time idle)
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66 "Add the handler FUNCTION to be run at TIME and IDLE."
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67 ;; First remove any old handlers that use this function.
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68 (gnus-demon-remove-handler function)
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69 ;; Then add the new one.
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70 (push (list function time idle) gnus-demon-handlers)
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71 (gnus-demon-init))
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72
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73 (defun gnus-demon-remove-handler (function &optional no-init)
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74 "Remove the handler FUNCTION from the list of handlers."
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75 (setq gnus-demon-handlers
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76 (delq (assq function gnus-demon-handlers)
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77 gnus-demon-handlers))
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78 (or no-init (gnus-demon-init)))
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79
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80 (defun gnus-demon-init ()
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81 "Initialize the Gnus daemon."
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82 (interactive)
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83 (gnus-demon-cancel)
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84 (if (null gnus-demon-handlers)
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85 () ; Nothing to do.
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86 ;; Set up timer.
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87 (setq gnus-demon-timer
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88 (nnheader-run-at-time
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89 gnus-demon-timestep gnus-demon-timestep 'gnus-demon))
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90 ;; Reset control variables.
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91 (setq gnus-demon-handler-state
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92 (mapcar
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93 (lambda (handler)
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94 (list (car handler) (gnus-demon-time-to-step (nth 1 handler))
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95 (nth 2 handler)))
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96 gnus-demon-handlers))
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97 (setq gnus-demon-idle-time 0)
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98 (setq gnus-demon-idle-has-been-called nil)
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99 (setq gnus-use-demon t)))
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100
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101 (gnus-add-shutdown 'gnus-demon-cancel 'gnus)
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102
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103 (defun gnus-demon-cancel ()
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104 "Cancel any Gnus daemons."
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105 (interactive)
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106 (and gnus-demon-timer
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107 (nnheader-cancel-timer gnus-demon-timer))
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108 (setq gnus-demon-timer nil
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109 gnus-use-demon nil))
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110
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111 (defun gnus-demon-is-idle-p ()
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112 "Whether Emacs is idle or not."
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113 ;; We do this simply by comparing the 100 most recent keystrokes
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114 ;; with the ones we had last time. If they are the same, one might
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115 ;; guess that Emacs is indeed idle. This only makes sense if one
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116 ;; calls this function seldom -- like once a minute, which is what
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117 ;; we do here.
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118 (let ((keys (recent-keys)))
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119 (or (equal keys gnus-demon-last-keys)
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120 (progn
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121 (setq gnus-demon-last-keys keys)
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122 nil))))
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123
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124 (defun gnus-demon-time-to-step (time)
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125 "Find out how many seconds to TIME, which is on the form \"17:43\"."
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126 (if (not (stringp time))
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127 time
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128 (let* ((date (current-time-string))
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129 (dv (timezone-parse-date date))
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130 (tdate (timezone-make-arpa-date
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131 (string-to-number (aref dv 0))
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132 (string-to-number (aref dv 1))
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133 (string-to-number (aref dv 2)) time
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134 (or (aref dv 4) "UT")))
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135 (nseconds (gnus-time-minus
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136 (gnus-encode-date tdate) (gnus-encode-date date))))
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137 (round
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138 (/ (if (< nseconds 0)
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139 (+ nseconds (* 60 60 24))
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140 nseconds) gnus-demon-timestep)))))
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141
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142 (defun gnus-demon ()
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143 "The Gnus daemon that takes care of running all Gnus handlers."
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144 ;; Increase or reset the time Emacs has been idle.
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145 (if (gnus-demon-is-idle-p)
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146 (incf gnus-demon-idle-time)
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147 (setq gnus-demon-idle-time 0)
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148 (setq gnus-demon-idle-has-been-called nil))
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149 ;; Then we go through all the handler and call those that are
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150 ;; sufficiently ripe.
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151 (let ((handlers gnus-demon-handler-state)
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152 handler time idle)
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153 (while handlers
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154 (setq handler (pop handlers))
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155 (cond
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156 ((numberp (setq time (nth 1 handler)))
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157 ;; These handlers use a regular timeout mechanism. We decrease
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158 ;; the timer if it hasn't reached zero yet.
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159 (or (zerop time)
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160 (setcar (nthcdr 1 handler) (decf time)))
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161 (and (zerop time) ; If the timer now is zero...
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162 (or (not (setq idle (nth 2 handler))) ; Don't care about idle.
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163 (and (numberp idle) ; Numerical idle...
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164 (< idle gnus-demon-idle-time)) ; Idle timed out.
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165 gnus-demon-is-idle) ; Or just need to be idle.
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166 ;; So we call the handler.
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167 (progn
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168 (funcall (car handler))
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169 ;; And reset the timer.
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170 (setcar (nthcdr 1 handler)
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171 (gnus-demon-time-to-step
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172 (nth 1 (assq (car handler) gnus-demon-handlers)))))))
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173 ;; These are only supposed to be called when Emacs is idle.
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174 ((null (setq idle (nth 2 handler)))
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175 ;; We do nothing.
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176 )
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177 ((not (numberp idle))
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178 ;; We want to call this handler each and every time that
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179 ;; Emacs is idle.
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180 (funcall (car handler)))
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181 (t
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182 ;; We want to call this handler only if Emacs has been idle
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183 ;; for a specified number of timesteps.
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184 (and (not (memq (car handler) gnus-demon-idle-has-been-called))
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185 (< idle gnus-demon-idle-time)
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186 (progn
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187 (funcall (car handler))
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188 ;; Make sure the handler won't be called once more in
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189 ;; this idle-cycle.
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190 (push (car handler) gnus-demon-idle-has-been-called))))))))
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191
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192 (defun gnus-demon-add-nocem ()
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193 "Add daemonic NoCeM handling to Gnus."
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194 (gnus-demon-add-handler 'gnus-demon-scan-nocem 60 t))
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195
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196 (defun gnus-demon-scan-nocem ()
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197 "Scan NoCeM groups for NoCeM messages."
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198 (gnus-nocem-scan-groups))
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199
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200 (defun gnus-demon-add-disconnection ()
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201 "Add daemonic server disconnection to Gnus."
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202 (gnus-demon-add-handler 'gnus-demon-close-connections nil 30))
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203
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204 (defun gnus-demon-close-connections ()
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205 (gnus-close-backends))
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206
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207 (defun gnus-demon-add-scanmail ()
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208 "Add daemonic scanning of mail from the mail backends."
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209 (gnus-demon-add-handler 'gnus-demon-scan-mail 120 60))
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210
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211 (defun gnus-demon-scan-mail ()
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212 (let ((servers gnus-opened-servers)
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213 server)
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214 (while (setq server (car (pop servers)))
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215 (and (gnus-check-backend-function 'request-scan (car server))
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216 (or (gnus-server-opened server)
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217 (gnus-open-server server))
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218 (gnus-request-scan nil server)))))
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219
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220 (provide 'gnus-demon)
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221
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222 ;;; gnus-demon.el ends here
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