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223 lines
7.3 KiB
EmacsLisp
223 lines
7.3 KiB
EmacsLisp
;;; gnus-demon.el --- daemonic Gnus behaviour
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;; Copyright (C) 1995,96 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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;; Keywords: news
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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(require 'gnus)
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(eval-when-compile (require 'cl))
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(defvar gnus-demon-handlers nil
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"Alist of daemonic handlers to be run at intervals.
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Each handler is a list on the form
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\(FUNCTION TIME IDLE)
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FUNCTION is the function to be called.
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TIME is the number of `gnus-demon-timestep's between each call.
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If nil, never call. If t, call each `gnus-demon-timestep'.
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If IDLE is t, only call if Emacs has been idle for a while. If IDLE
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is a number, only call when Emacs has been idle more than this number
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of `gnus-demon-timestep's. If IDLE is nil, don't care about
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idleness. If IDLE is a number and TIME is nil, then call once each
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time Emacs has been idle for IDLE `gnus-demon-timestep's.")
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(defvar gnus-demon-timestep 60
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"*Number of seconds in each demon timestep.")
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;;; Internal variables.
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(defvar gnus-demon-timer nil)
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(defvar gnus-demon-idle-has-been-called nil)
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(defvar gnus-demon-idle-time 0)
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(defvar gnus-demon-handler-state nil)
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(defvar gnus-demon-is-idle nil)
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(defvar gnus-demon-last-keys nil)
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(eval-and-compile
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(autoload 'timezone-parse-date "timezone")
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(autoload 'timezone-make-arpa-date "timezone"))
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;;; Functions.
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(defun gnus-demon-add-handler (function time idle)
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"Add the handler FUNCTION to be run at TIME and IDLE."
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;; First remove any old handlers that use this function.
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(gnus-demon-remove-handler function)
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;; Then add the new one.
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(push (list function time idle) gnus-demon-handlers)
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(gnus-demon-init))
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(defun gnus-demon-remove-handler (function &optional no-init)
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"Remove the handler FUNCTION from the list of handlers."
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(setq gnus-demon-handlers
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(delq (assq function gnus-demon-handlers)
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gnus-demon-handlers))
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(or no-init (gnus-demon-init)))
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(defun gnus-demon-init ()
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"Initialize the Gnus daemon."
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(interactive)
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(gnus-demon-cancel)
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(if (null gnus-demon-handlers)
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() ; Nothing to do.
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;; Set up timer.
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(setq gnus-demon-timer
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(nnheader-run-at-time
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gnus-demon-timestep gnus-demon-timestep 'gnus-demon))
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;; Reset control variables.
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(setq gnus-demon-handler-state
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(mapcar
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(lambda (handler)
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(list (car handler) (gnus-demon-time-to-step (nth 1 handler))
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(nth 2 handler)))
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gnus-demon-handlers))
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(setq gnus-demon-idle-time 0)
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(setq gnus-demon-idle-has-been-called nil)
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(setq gnus-use-demon t)))
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(gnus-add-shutdown 'gnus-demon-cancel 'gnus)
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(defun gnus-demon-cancel ()
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"Cancel any Gnus daemons."
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(interactive)
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(and gnus-demon-timer
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(nnheader-cancel-timer gnus-demon-timer))
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(setq gnus-demon-timer nil
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gnus-use-demon nil))
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(defun gnus-demon-is-idle-p ()
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"Whether Emacs is idle or not."
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;; We do this simply by comparing the 100 most recent keystrokes
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;; with the ones we had last time. If they are the same, one might
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;; guess that Emacs is indeed idle. This only makes sense if one
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;; calls this function seldom -- like once a minute, which is what
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;; we do here.
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(let ((keys (recent-keys)))
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(or (equal keys gnus-demon-last-keys)
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(progn
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(setq gnus-demon-last-keys keys)
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nil))))
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(defun gnus-demon-time-to-step (time)
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"Find out how many seconds to TIME, which is on the form \"17:43\"."
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(if (not (stringp time))
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time
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(let* ((date (current-time-string))
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(dv (timezone-parse-date date))
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(tdate (timezone-make-arpa-date
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(string-to-number (aref dv 0))
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(string-to-number (aref dv 1))
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(string-to-number (aref dv 2)) time
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(or (aref dv 4) "UT")))
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(nseconds (gnus-time-minus
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(gnus-encode-date tdate) (gnus-encode-date date))))
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(round
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(/ (if (< nseconds 0)
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(+ nseconds (* 60 60 24))
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nseconds) gnus-demon-timestep)))))
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(defun gnus-demon ()
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"The Gnus daemon that takes care of running all Gnus handlers."
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;; Increase or reset the time Emacs has been idle.
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(if (gnus-demon-is-idle-p)
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(incf gnus-demon-idle-time)
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(setq gnus-demon-idle-time 0)
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(setq gnus-demon-idle-has-been-called nil))
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;; Then we go through all the handler and call those that are
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;; sufficiently ripe.
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(let ((handlers gnus-demon-handler-state)
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handler time idle)
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(while handlers
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(setq handler (pop handlers))
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(cond
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((numberp (setq time (nth 1 handler)))
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;; These handlers use a regular timeout mechanism. We decrease
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;; the timer if it hasn't reached zero yet.
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(or (zerop time)
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(setcar (nthcdr 1 handler) (decf time)))
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(and (zerop time) ; If the timer now is zero...
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(or (not (setq idle (nth 2 handler))) ; Don't care about idle.
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(and (numberp idle) ; Numerical idle...
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(< idle gnus-demon-idle-time)) ; Idle timed out.
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gnus-demon-is-idle) ; Or just need to be idle.
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;; So we call the handler.
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(progn
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(funcall (car handler))
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;; And reset the timer.
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(setcar (nthcdr 1 handler)
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(gnus-demon-time-to-step
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(nth 1 (assq (car handler) gnus-demon-handlers)))))))
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;; These are only supposed to be called when Emacs is idle.
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((null (setq idle (nth 2 handler)))
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;; We do nothing.
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)
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((not (numberp idle))
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;; We want to call this handler each and every time that
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;; Emacs is idle.
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(funcall (car handler)))
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(t
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;; We want to call this handler only if Emacs has been idle
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;; for a specified number of timesteps.
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(and (not (memq (car handler) gnus-demon-idle-has-been-called))
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(< idle gnus-demon-idle-time)
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(progn
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(funcall (car handler))
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;; Make sure the handler won't be called once more in
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;; this idle-cycle.
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(push (car handler) gnus-demon-idle-has-been-called))))))))
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(defun gnus-demon-add-nocem ()
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"Add daemonic NoCeM handling to Gnus."
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(gnus-demon-add-handler 'gnus-demon-scan-nocem 60 t))
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(defun gnus-demon-scan-nocem ()
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"Scan NoCeM groups for NoCeM messages."
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(gnus-nocem-scan-groups))
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(defun gnus-demon-add-disconnection ()
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"Add daemonic server disconnection to Gnus."
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(gnus-demon-add-handler 'gnus-demon-close-connections nil 30))
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(defun gnus-demon-close-connections ()
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(gnus-close-backends))
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(defun gnus-demon-add-scanmail ()
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"Add daemonic scanning of mail from the mail backends."
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(gnus-demon-add-handler 'gnus-demon-scan-mail 120 60))
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(defun gnus-demon-scan-mail ()
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(let ((servers gnus-opened-servers)
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server)
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(while (setq server (car (pop servers)))
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(and (gnus-check-backend-function 'request-scan (car server))
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(or (gnus-server-opened server)
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(gnus-open-server server))
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(gnus-request-scan nil server)))))
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(provide 'gnus-demon)
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;;; gnus-demon.el ends here
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