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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-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
(defconst display-time-day-and-date nil "\
*Non-nil means \\[display-time] should display day and date as well as time.")
(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.")
;;;###autoload
(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
(concat exec-directory "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 (condition-case ()
(if (zerop (car (load-average))) ""
(format "%03d" (car (load-average))))
(error "")))
(mail-spool-file (or display-time-mail-file
(getenv "MAIL")
(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?
(display-time-file-nonempty-p mail-spool-file))
" 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))
(defun display-time-file-nonempty-p (file)
(while (file-symlink-p file)
(setq file (file-symlink-p file)))
(> (nth 7 (file-attributes file)) 0))
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