xemacs-beta: lisp/packages/time.el comparison

comparison lisp/packages/time.el @ 0:376386a54a3c r19-14

Import from CVS: tag r19-14

author	cvs
date	Mon, 13 Aug 2007 08:45:50 +0200
parents
children	ac2d302a0011

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+:376386a54a3c
+;;; time.el --- display time and load in mode line of Emacs.
+;; Copyright (C) 1985, 1986, 1987, 1992-1994 Free Software Foundation, Inc.
+;; Maintainer: FSF
+;; Keywords: extensions
+;; This file is part of XEmacs.
+;; XEmacs is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+;; XEmacs is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;; You should have received a copy of the GNU General Public License
+;; along with XEmacs; see the file COPYING.  If not, write to the Free
+;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;;; Synched up with: FSF 19.30.
+;;; Commentary:
+;;; Facilities to display current time/date and a new-mail indicator
+;;; in the Emacs mode line.  The single entry point is `display-time'.
+;;; See also reportmail.el.
+;;; This uses the XEmacs timeout-event mechanism, via a version
+;;; of Kyle Jones' itimer package.
+;;; Code:
+(require 'itimer)
+(defvar display-time-mail-file nil
+"*File name of mail inbox file, for indicating existence of new mail.
+Non-nil and not a string means don't check for mail.  nil means use
+default, which is system-dependent, and is the same as used by Rmail.")
+;;;###autoload
+(defvar display-time-day-and-date nil "\
+*Non-nil means \\[display-time] should display day and date as well as time.")
+(defvar display-time-interval 60
+"*Seconds between updates of time in the mode line.")
+(defvar display-time-24hr-format nil
+"*Non-nil indicates time should be displayed as hh:mm, 0 <= hh <= 23.
+Nil means 1 <= hh <= 12, and an AM/PM suffix is used.")
+(defvar display-time-echo-area nil
+"*If non-nil, display-time will use the echo area instead of the mode line.")
+(defvar display-time-string nil)
+(defvar display-time-hook nil
+"*List of functions to be called when the time is updated on the mode line.")
+(defvar display-time-server-down-time nil
+"Time when mail file's file system was recorded to be down.
+If that file system seems to be up, the value is nil.")
+;;;###autoload
+(defun display-time ()
+"Display current time, load level, and mail flag in mode line of each buffer.
+Updates automatically every minute.
+If `display-time-day-and-date' is non-nil, the current day and date
+are displayed as well.
+After each update, `display-time-hook' is run with `run-hooks'.
+If `display-time-echo-area' is non-nil, the time is displayed in the
+echo area instead of in the mode-line."
+(interactive)
+;; if the "display-time" itimer already exists, nuke it first.
+(let ((old (get-itimer "display-time")))
+(if old (delete-itimer old)))
+;; If we're not displaying the time in the echo area
+;; and the global mode string does not have a non-nil value
+;; then initialize the global mode string's value.
+(or display-time-echo-area
+global-mode-string
+(setq global-mode-string '("")))
+;; If we're not displaying the time in the echo area
+;; and our display variable is not part of the global-mode-string list
+;; the we add our variable to the list.  This will make the time
+;; appear on the modeline.
+(or display-time-echo-area
+(memq 'display-time-string global-mode-string)
+(setq global-mode-string
+	    (append global-mode-string '(display-time-string))))
+;; Display the time initially...
+(display-time-function)
+;; ... and start an itimer to do it automatically thereafter.
+;;
+;; If we wanted to be really clever about this, we could have the itimer
+;; not be automatically restarted, but have it re-add itself each time.
+;; Then we could look at (current-time) and arrange for the itimer to
+;; wake up exactly at the minute boundary.  But that's just a little
+;; more work than it's worth...
+(start-itimer "display-time" 'display-time-function
+		display-time-interval display-time-interval))
+(defvar display-time-string-forms
+'((if display-time-day-and-date
+(format "%s %s %s " dayname monthname day)
+"")
+(format "%s:%s%s"
+(if display-time-24hr-format 24-hours 12-hours)
+minutes
+(if display-time-24hr-format "" am-pm))
+load
+(if mail " Mail" ""))
+"*A list of expressions governing display of the time in the mode line.
+This expression is a list of expressions that can involve the keywords
+`load', `day', `month', and `year', `12-hours', `24-hours', `minutes',
+`seconds', all numbers in string form, and `monthname', `dayname', `am-pm',
+and `time-zone' all alphabetic strings, and `mail' a true/nil value.
+For example, the form
+'((substring year -2) \"/\" month \"/\" day
+\" \" 24-hours \":\" minutes \":\" seconds
+(if time-zone \" (\") time-zone (if time-zone \")\")
+(if mail \" Mail\" \"\"))
+would give mode line times like `94/12/30 21:07:48 (UTC)'.")
+(defun display-time-function ()
+(let* ((now (current-time))
+	 (time (current-time-string now))
+(load (condition-case ()
+(if (zerop (car (load-average))) ""
+(let ((str (format " %03d" (car (load-average)))))
+(concat (substring str 0 -2) "." (substring str -2))))
+(error "")))
+(mail-spool-file (or display-time-mail-file
+(getenv "MAIL")
+(concat rmail-spool-directory
+(user-login-name))))
+	 (mail (and (stringp mail-spool-file)
+		    (or (null display-time-server-down-time)
+			;; If have been down for 20 min, try again.
+			(> (- (nth 1 (current-time))
+			      display-time-server-down-time)
+			   1200))
+		    (let ((start-time (current-time)))
+		      (prog1
+			  (display-time-file-nonempty-p mail-spool-file)
+			(if (> (- (nth 1 (current-time)) (nth 1 start-time))
+			       20)
+			    ;; Record that mail file is not accessible.
+			    (setq display-time-server-down-time
+				  (nth 1 (current-time)))
+			  ;; Record that mail file is accessible.
+			  (setq display-time-server-down-time nil))))))
+(24-hours (substring time 11 13))
+(hour (string-to-int 24-hours))
+(12-hours (int-to-string (1+ (% (+ hour 11) 12))))
+(am-pm (if (>= hour 12) "pm" "am"))
+(minutes (substring time 14 16))
+(seconds (substring time 17 19))
+(time-zone (car (cdr (current-time-zone now))))
+(day (substring time 8 10))
+(year (substring time 20 24))
+(monthname (substring time 4 7))
+(month
+(cdr
+(assoc
+monthname
+'(("Jan" . "1") ("Feb" . "2") ("Mar" . "3") ("Apr" . "4")
+("May" . "5") ("Jun" . "6") ("Jul" . "7") ("Aug" . "8")
+("Sep" . "9") ("Oct" . "10") ("Nov" . "11") ("Dec" . "12")))))
+(dayname (substring time 0 3)))
+(setq display-time-string
+(mapconcat 'eval display-time-string-forms ""))
+;; This is inside the let binding, but we are not going to document
+;; what variables are available.
+(run-hooks 'display-time-hook))
+(if display-time-echo-area
+(or (> (minibuffer-depth) 0)
+	  ;; don't stomp echo-area-buffer if reading from minibuffer now.
+	  (save-excursion
+	    (save-window-excursion
+	      (select-window (minibuffer-window))
+	      (erase-buffer)
+	      (indent-to (- (screen-width) (length display-time-string) 1))
+	      (insert display-time-string)
+	      (message (buffer-string)))))
+(force-mode-line-update)
+;; Do redisplay right now, if no input pending.
+(sit-for 0)))
+(defun display-time-file-nonempty-p (file)
+(and (file-exists-p file)
+(< 0 (nth 7 (file-attributes (file-chase-links file))))))
+(provide 'time)
+;;; time.el ends here

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comparison lisp/packages/time.el @ 0:376386a54a3c r19-14