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- ;;; time.el --- display time and load in mode line of Emacs.
- ;; Keywords: extensions
-
- ;; See also reportmail.el.
- ;; This uses the Lucid Emacs timeout-event mechanism, via a version
- ;; of Kyle Jones' itimer package.
- ;; Copyright (C) 1985, 1986, 1987, 1992, 1993 Free Software Foundation, Inc.
-
- ;; 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.
-
- (require 'itimer)
-
- (defvar display-time-mail-file nil
- "*File name of mail inbox file, for indicating existence of new mail.
- Default 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-nill 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-hook nil
- "*List of functions to be called when the time is updated on the mode line.")
-
- (defvar display-time-string 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))
-
-
- (defun display-time-function ()
- (let ((time (current-time-string))
- (load (let ((debug-on-error nil) ;fmh
- (stack-trace-on-error nil))
- (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
- (or (getenv "LOGNAME")
- (getenv "USER")
- (user-login-name)))))
- hour am-pm-flag string)
- (setq hour (read (substring time 11 13)))
- (if (not display-time-24hr-format)
- (progn
- (setq am-pm-flag (if (>= hour 12) "pm" "am"))
- (if (> hour 12)
- (setq hour (- hour 12))
- (if (= hour 0)
- (setq hour 12))))
- (setq am-pm-flag ""))
- (setq string
- (concat (format "%d" hour) (substring time 13 16)
- am-pm-flag
- load
- (if (and (file-exists-p mail-spool-file)
- ;; file not empty?
- (< 0 (nth 7 (file-attributes
- (file-chase-links mail-spool-file)))))
- " Mail"
- "")))
- ;; Append the date if desired.
- (if display-time-day-and-date
- (setq string (concat (substring time 0 11) string)))
- (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 string) 1))
- (insert string)
- (message (buffer-string)))))
- (setq display-time-string string)
- ;; Force redisplay of all buffers' mode lines to be considered.
- (save-excursion (set-buffer (other-buffer)))
- (set-buffer-modified-p (buffer-modified-p))
- ;; Do redisplay right now, if no input pending.
- (sit-for 0))))
-
- (provide 'time)
-