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+;; Display time and load in mode line of Emacs.
+;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+(defvar display-time-process nil)
+
+(defvar display-time-interval 60
+  "*Seconds between updates of time in 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.")
+
+(defun display-time ()
+  "Display current time and load level 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'."
+  (interactive)
+  (let ((live (and display-time-process
+		   (eq (process-status display-time-process) 'run))))
+    (if (not live)
+	(progn
+	  (if display-time-process
+	      (delete-process display-time-process))
+	  (or global-mode-string (setq global-mode-string '("")))
+	  (or (memq 'display-time-string global-mode-string)
+	      (setq global-mode-string
+		    (append global-mode-string '(display-time-string))))
+	  (setq display-time-string "")
+	  (setq display-time-process
+		(start-process "display-time" nil
+			       "wakeup"
+			       (int-to-string display-time-interval)))
+	  (process-kill-without-query display-time-process)
+	  (set-process-sentinel display-time-process 'display-time-sentinel)
+	  (set-process-filter display-time-process 'display-time-filter)))))
+
+(defun display-time-sentinel (proc reason)
+  (or (eq (process-status proc) 'run)
+      (setq display-time-string ""))
+  ;; Force mode-line updates
+  (save-excursion (set-buffer (other-buffer)))
+  (set-buffer-modified-p (buffer-modified-p))
+  (sit-for 0))
+
+(defun display-time-filter (proc string)
+  (let ((time (current-time-string))
+	(load (format "%03d" (car (load-average))))
+	(mail-spool-file (concat rmail-spool-directory
+				 (or (getenv "LOGNAME")
+				     (getenv "USER")
+				     (user-login-name))))
+	hour pm)
+    (setq hour (read (substring time 11 13)))
+    (setq pm (>= hour 12))
+    (if (> hour 12)
+	(setq hour (- hour 12))
+      (if (= hour 0)
+	  (setq hour 12)))
+    (setq display-time-string
+	  (concat (format "%d" hour) (substring time 13 16)
+		  (if pm "pm " "am ")
+		  (substring load 0 -2) "." (substring load -2)
+		  (if (and (file-exists-p mail-spool-file)
+			   ;; file not empty?
+			   (> (nth 7 (file-attributes mail-spool-file)) 0))
+		      " Mail"
+		    "")))
+    ;; Append the date if desired.
+    (if display-time-day-and-date
+	(setq display-time-string
+	      (concat (substring time 0 11) display-time-string))))
+  (run-hooks 'display-time-hook)
+  ;; 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))