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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.
- 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-process nil)
-
- (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-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
- (save-excursion (set-buffer (other-buffer)))
- (set-buffer-modified-p (buffer-modified-p))
- (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* ((time (current-time-string))
- (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
- (or (getenv "LOGNAME")
- (getenv "USER")
- (user-login-name)))))
- (mail (and (file-exists-p mail-spool-file)
- (display-time-file-nonempty-p mail-spool-file)))
- (24-hours (substring time 11 13))
- (hour (string-to-int 24-hours))
- (12-hours (int-to-string (if (> hour 12)
- (- hour 12)
- (if (= hour 0)
- 12
- hour))))
- (am-pm (if (>= hour 12) "pm" "am"))
- (minutes (substring time 14 16))
- (seconds (substring time 17 19))
- (time-zone (car (cdr (current-time-zone))))
- (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 "")))
- (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)
- (and (file-exists-p file)
- (< 0 (nth 7 (file-attributes (file-chase-links file))))))
-
- ;;; time.el ends here
-