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;;; time.el --- display time and load in mode line of Emacs.
;; Copyright (C) 1985, 1986, 1987, 1993, 1994 Free Software Foundation, Inc.
;; Maintainer: FSF
;; 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 2, 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.
;;; Commentary:
;;; Facilities to display current time/date and a new-mail indicator
;;; in the Emacs mode line. The single entry point is `display-time'.
;;; Code:
(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-process nil)
(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-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'."
(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 "")
;; Using a pty is wasteful, and the separate session causes
;; annoyance sometimes (some systems kill idle sessions).
(let ((process-connection-type nil))
(setq display-time-process
(start-process "display-time" nil
(expand-file-name "wakeup" exec-directory)
(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
(force-mode-line-update t)
(sit-for 0))
(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-filter (proc string)
(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))
(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))))))
;;; time.el ends here
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