(eval-when-compile (require 'cl))
(require 'gnus)
(require 'gnus-int)
(require 'nnheader)
(require 'nntp)
(require 'nnmail)
(require 'gnus-util)
(eval-and-compile
(if (featurep 'xemacs)
(require 'itimer)
(require 'timer)))
(autoload 'parse-time-string "parse-time" nil nil)
(defgroup gnus-demon nil
"Demonic behaviour."
:group 'gnus)
(defcustom gnus-demon-handlers nil
"Alist of daemonic handlers to be run at intervals.
Each handler is a list on the form
\(FUNCTION TIME IDLE)
FUNCTION is the function to be called.
TIME is the number of `gnus-demon-timestep's between each call.
If nil, never call. If t, call each `gnus-demon-timestep'.
If IDLE is t, only call if Emacs has been idle for a while. If IDLE
is a number, only call when Emacs has been idle more than this number
of `gnus-demon-timestep's. If IDLE is nil, don't care about
idleness. If IDLE is a number and TIME is nil, then call once each
time Emacs has been idle for IDLE `gnus-demon-timestep's."
:group 'gnus-demon
:type '(repeat (list function
(choice :tag "Time"
(const :tag "never" nil)
(const :tag "one" t)
(integer :tag "steps" 1))
(choice :tag "Idle"
(const :tag "don't care" nil)
(const :tag "for a while" t)
(integer :tag "steps" 1)))))
(defcustom gnus-demon-timestep 60
"*Number of seconds in each demon timestep."
:group 'gnus-demon
:type 'integer)
(defvar gnus-demon-timer nil)
(defvar gnus-demon-idle-has-been-called nil)
(defvar gnus-demon-idle-time 0)
(defvar gnus-demon-handler-state nil)
(defvar gnus-demon-last-keys nil)
(defvar gnus-inhibit-demon nil
"*If non-nil, no daemonic function will be run.")
(defun gnus-demon-add-handler (function time idle)
"Add the handler FUNCTION to be run at TIME and IDLE."
(gnus-demon-remove-handler function)
(push (list function time idle) gnus-demon-handlers)
(gnus-demon-init))
(defun gnus-demon-remove-handler (function &optional no-init)
"Remove the handler FUNCTION from the list of handlers."
(gnus-pull function gnus-demon-handlers)
(unless no-init
(gnus-demon-init)))
(defun gnus-demon-init ()
"Initialize the Gnus daemon."
(interactive)
(gnus-demon-cancel)
(when gnus-demon-handlers
(setq gnus-demon-timer
(nnheader-run-at-time
gnus-demon-timestep gnus-demon-timestep 'gnus-demon))
(setq gnus-demon-handler-state
(mapcar
(lambda (handler)
(list (car handler) (gnus-demon-time-to-step (nth 1 handler))
(nth 2 handler)))
gnus-demon-handlers))
(setq gnus-demon-idle-time 0)
(setq gnus-demon-idle-has-been-called nil)))
(gnus-add-shutdown 'gnus-demon-cancel 'gnus)
(defun gnus-demon-cancel ()
"Cancel any Gnus daemons."
(interactive)
(when gnus-demon-timer
(nnheader-cancel-timer gnus-demon-timer))
(setq gnus-demon-timer nil
gnus-demon-idle-has-been-called nil)
(condition-case ()
(nnheader-cancel-function-timers 'gnus-demon)
(error t)))
(defun gnus-demon-is-idle-p ()
"Whether Emacs is idle or not."
(let ((keys (recent-keys)))
(or (equal keys gnus-demon-last-keys)
(progn
(setq gnus-demon-last-keys keys)
nil))))
(defun gnus-demon-time-to-step (time)
"Find out how many seconds to TIME, which is on the form \"17:43\"."
(if (not (stringp time))
time
(let* ((now (current-time))
(nowParts (decode-time now))
(thenParts (parse-time-string time))
(thenHour (elt thenParts 2))
(thenMin (elt thenParts 1))
(then (encode-time 0
thenMin
thenHour
(+ (elt nowParts 3)
(if (or (< thenHour (elt nowParts 2))
(and (= thenHour (elt nowParts 2))
(<= thenMin (elt nowParts 1))))
1 0))
(elt nowParts 4)
(elt nowParts 5)
(elt nowParts 6)
(elt nowParts 7)
(elt nowParts 8)))
(diff (+ (* 65536 (- (car then) (car now)))
(- (cadr then) (cadr now)))))
(round (/ diff gnus-demon-timestep)))))
(defun gnus-demon ()
"The Gnus daemon that takes care of running all Gnus handlers."
(if (gnus-demon-is-idle-p)
(incf gnus-demon-idle-time)
(setq gnus-demon-idle-time 0)
(setq gnus-demon-idle-has-been-called nil))
(when (and (not (window-minibuffer-p (selected-window)))
(not gnus-inhibit-demon))
(let ((handlers gnus-demon-handler-state)
(gnus-inhibit-demon t)
use-dialog-box (last-nonmenu-event 10)
handler time idle)
(while handlers
(setq handler (pop handlers))
(cond
((numberp (setq time (nth 1 handler)))
(unless (zerop time)
(setcar (nthcdr 1 handler) (decf time)))
(and (zerop time) (progn
(setq idle (nth 2 handler))
(cond
((null idle) t) ((numberp idle) (< idle gnus-demon-idle-time)) (t (< 0 gnus-demon-idle-time)))) (gnus-with-local-quit
(ignore-errors (funcall (car handler)))
(setcar (nthcdr 1 handler)
(gnus-demon-time-to-step
(nth 1 (assq (car handler) gnus-demon-handlers)))))))
((null (setq idle (nth 2 handler)))
)
((and (not (numberp idle))
(gnus-demon-is-idle-p))
(gnus-with-local-quit
(ignore-errors (funcall (car handler)))))
(t
(and (not (memq (car handler) gnus-demon-idle-has-been-called))
(< idle gnus-demon-idle-time)
(gnus-demon-is-idle-p)
(gnus-with-local-quit
(ignore-errors (funcall (car handler)))
(push (car handler) gnus-demon-idle-has-been-called)))))))))
(defun gnus-demon-add-nocem ()
"Add daemonic NoCeM handling to Gnus."
(gnus-demon-add-handler 'gnus-demon-scan-nocem 60 30))
(defun gnus-demon-scan-nocem ()
"Scan NoCeM groups for NoCeM messages."
(save-window-excursion
(gnus-nocem-scan-groups)))
(defun gnus-demon-add-disconnection ()
"Add daemonic server disconnection to Gnus."
(gnus-demon-add-handler 'gnus-demon-close-connections nil 30))
(defun gnus-demon-close-connections ()
(save-window-excursion
(gnus-close-backends)))
(defun gnus-demon-add-nntp-close-connection ()
"Add daemonic nntp server disconnection to Gnus.
If no commands have gone out via nntp during the last five
minutes, the connection is closed."
(gnus-demon-add-handler 'gnus-demon-nntp-close-connections 5 nil))
(defun gnus-demon-nntp-close-connection ()
(save-window-excursion
(when (time-less-p '(0 300) (time-since nntp-last-command-time))
(nntp-close-server))))
(defun gnus-demon-add-scanmail ()
"Add daemonic scanning of mail from the mail backends."
(gnus-demon-add-handler 'gnus-demon-scan-mail 120 60))
(defun gnus-demon-scan-mail ()
(save-window-excursion
(let ((servers gnus-opened-servers)
server
(nnmail-fetched-sources (list t)))
(while (setq server (car (pop servers)))
(and (gnus-check-backend-function 'request-scan (car server))
(or (gnus-server-opened server)
(gnus-open-server server))
(gnus-request-scan nil server))))))
(defun gnus-demon-add-rescan ()
"Add daemonic scanning of new articles from all backends."
(gnus-demon-add-handler 'gnus-demon-scan-news 120 60))
(defun gnus-demon-scan-news ()
(let ((win (current-window-configuration)))
(unwind-protect
(save-window-excursion
(save-excursion
(when (gnus-alive-p)
(save-excursion
(set-buffer gnus-group-buffer)
(gnus-group-get-new-news)))))
(set-window-configuration win))))
(defun gnus-demon-add-scan-timestamps ()
"Add daemonic updating of timestamps in empty newgroups."
(gnus-demon-add-handler 'gnus-demon-scan-timestamps nil 30))
(defun gnus-demon-scan-timestamps ()
"Set the timestamp on all newsgroups with no unread and no ticked articles."
(when (gnus-alive-p)
(let ((cur-time (current-time))
(newsrc (cdr gnus-newsrc-alist))
info group unread has-ticked)
(while (setq info (pop newsrc))
(setq group (gnus-info-group info)
unread (gnus-group-unread group)
has-ticked (cdr (assq 'tick (gnus-info-marks info))))
(when (and (numberp unread)
(= unread 0)
(not has-ticked))
(gnus-group-set-parameter group 'timestamp cur-time))))))
(provide 'gnus-demon)