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324 lines
11 KiB
EmacsLisp
324 lines
11 KiB
EmacsLisp
;;; gnus-demon.el --- daemonic Gnus behavior
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;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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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 3 of the License, or
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;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(eval-when-compile (require 'cl))
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(require 'gnus)
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(require 'gnus-int)
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(require 'nnheader)
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(require 'nntp)
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(require 'nnmail)
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(require 'gnus-util)
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(autoload 'parse-time-string "parse-time" nil nil)
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(defgroup gnus-demon nil
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"Demonic behavior."
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:group 'gnus)
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(defcustom 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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:group 'gnus-demon
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:type '(repeat (list function
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(choice :tag "Time"
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(const :tag "never" nil)
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(const :tag "one" t)
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(integer :tag "steps" 1))
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(choice :tag "Idle"
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(const :tag "don't care" nil)
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(const :tag "for a while" t)
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(integer :tag "steps" 1)))))
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(defcustom gnus-demon-timestep 60
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"*Number of seconds in each demon timestep."
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:group 'gnus-demon
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:type 'integer)
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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-last-keys nil)
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(defvar gnus-inhibit-demon nil
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"*If non-nil, no daemonic function will be run.")
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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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(gnus-pull function gnus-demon-handlers)
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(unless no-init
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(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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(when gnus-demon-handlers
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;; Set up the timer.
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(setq gnus-demon-timer
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(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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(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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(when 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-demon-idle-has-been-called nil)
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(condition-case ()
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(nnheader-cancel-function-timers 'gnus-demon)
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(error t)))
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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* ((now (current-time))
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;; obtain NOW as discrete components -- make a vector for speed
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(nowParts (decode-time now))
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;; obtain THEN as discrete components
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(thenParts (parse-time-string time))
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(thenHour (elt thenParts 2))
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(thenMin (elt thenParts 1))
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;; convert time as elements into number of seconds since EPOCH.
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(then (encode-time 0
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thenMin
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thenHour
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;; If THEN is earlier than NOW, make it
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;; same time tomorrow. Doc for encode-time
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;; says that this is OK.
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(+ (elt nowParts 3)
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(if (or (< thenHour (elt nowParts 2))
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(and (= thenHour (elt nowParts 2))
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(<= thenMin (elt nowParts 1))))
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1 0))
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(elt nowParts 4)
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(elt nowParts 5)
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(elt nowParts 6)
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(elt nowParts 7)
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(elt nowParts 8)))
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;; calculate number of seconds between NOW and THEN
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(diff (+ (* 65536 (- (car then) (car now)))
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(- (cadr then) (cadr now)))))
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;; return number of timesteps in the number of seconds
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(round (/ diff 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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;; Disable all daemonic stuff if we're in the minibuffer
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(when (and (not (window-minibuffer-p (selected-window)))
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(not gnus-inhibit-demon))
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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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(gnus-inhibit-demon t)
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;; Try to avoid dialog boxes, e.g. by Mailcrypt.
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;; Unfortunately, Emacs 20's `message-or-box...' doesn't
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;; obey `use-dialog-box'.
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use-dialog-box (last-nonmenu-event 10)
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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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(unless (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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;; Test for appropriate idleness
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(progn
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(setq idle (nth 2 handler))
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(cond
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((null idle) t) ; Don't care about idle.
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((numberp idle) ; Numerical idle...
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(< idle gnus-demon-idle-time)) ; Idle timed out.
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(t (< 0 gnus-demon-idle-time)))) ; Or just need to be idle.
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;; So we call the handler.
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(gnus-with-local-quit
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(ignore-errors (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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((and (not (numberp idle))
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(gnus-demon-is-idle-p))
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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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(gnus-with-local-quit
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(ignore-errors (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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(gnus-demon-is-idle-p)
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(gnus-with-local-quit
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(ignore-errors (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 30))
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(defun gnus-demon-scan-nocem ()
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"Scan NoCeM groups for NoCeM messages."
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(save-window-excursion
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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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(save-window-excursion
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(gnus-close-backends)))
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(defun gnus-demon-add-nntp-close-connection ()
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"Add daemonic nntp server disconnection to Gnus.
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If no commands have gone out via nntp during the last five
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minutes, the connection is closed."
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(gnus-demon-add-handler 'gnus-demon-nntp-close-connections 5 nil))
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(defun gnus-demon-nntp-close-connection ()
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(save-window-excursion
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(when (time-less-p '(0 300) (time-since nntp-last-command-time))
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(nntp-close-server))))
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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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(save-window-excursion
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(let ((servers gnus-opened-servers)
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server
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(nnmail-fetched-sources (list t)))
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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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(defun gnus-demon-add-rescan ()
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"Add daemonic scanning of new articles from all backends."
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(gnus-demon-add-handler 'gnus-demon-scan-news 120 60))
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(defun gnus-demon-scan-news ()
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(let ((win (current-window-configuration)))
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(unwind-protect
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(save-window-excursion
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(save-excursion
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(when (gnus-alive-p)
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(save-excursion
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(set-buffer gnus-group-buffer)
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(gnus-group-get-new-news)))))
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(set-window-configuration win))))
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(defun gnus-demon-add-scan-timestamps ()
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"Add daemonic updating of timestamps in empty newgroups."
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(gnus-demon-add-handler 'gnus-demon-scan-timestamps nil 30))
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(defun gnus-demon-scan-timestamps ()
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"Set the timestamp on all newsgroups with no unread and no ticked articles."
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(when (gnus-alive-p)
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(let ((cur-time (current-time))
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(newsrc (cdr gnus-newsrc-alist))
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info group unread has-ticked)
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(while (setq info (pop newsrc))
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(setq group (gnus-info-group info)
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unread (gnus-group-unread group)
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has-ticked (cdr (assq 'tick (gnus-info-marks info))))
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(when (and (numberp unread)
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(= unread 0)
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(not has-ticked))
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(gnus-group-set-parameter group 'timestamp cur-time))))))
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(provide 'gnus-demon)
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;; arch-tag: 8dd5cd3d-6ae4-46b4-9b15-f5fca09fd392
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;;; gnus-demon.el ends here
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