time.el 4.12 KB
Newer Older
Richard M. Stallman's avatar
Richard M. Stallman committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
;; 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.


21 22 23 24
(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.")

Roland McGrath's avatar
Roland McGrath committed
25 26 27 28
;;;###autoload
(defconst display-time-day-and-date nil "\
*Non-nil means \\[display-time] should display day and date as well as time.")

Richard M. Stallman's avatar
Richard M. Stallman committed
29 30 31 32 33 34 35 36 37 38
(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.")

Roland McGrath's avatar
Roland McGrath committed
39
;;;###autoload
Richard M. Stallman's avatar
Richard M. Stallman committed
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
(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
Roland McGrath's avatar
Roland McGrath committed
60
			       (concat exec-directory "wakeup")
Richard M. Stallman's avatar
Richard M. Stallman committed
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
			       (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))
Roland McGrath's avatar
Roland McGrath committed
76 77 78 79
	(load (condition-case ()
		  (if (zerop (car (load-average))) ""
		    (format "%03d" (car (load-average))))
		(error "")))
80 81 82 83 84 85
	(mail-spool-file (or display-time-mail-file
			     (getenv "MAIL")
			     (concat rmail-spool-directory
				     (or (getenv "LOGNAME")
					 (getenv "USER")
					 (user-login-name)))))
Richard M. Stallman's avatar
Richard M. Stallman committed
86 87 88 89 90 91 92 93 94 95 96 97 98
	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?
Roland McGrath's avatar
Roland McGrath committed
99
			   (display-time-file-nonempty-p mail-spool-file))
Richard M. Stallman's avatar
Richard M. Stallman committed
100 101 102 103 104 105 106 107 108 109 110 111
		      " 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))
Roland McGrath's avatar
Roland McGrath committed
112 113 114 115 116

(defun display-time-file-nonempty-p (file)
  (while (file-symlink-p file)
    (setq file (file-symlink-p file)))
  (> (nth 7 (file-attributes file)) 0))