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;;; time.el --- display time, load and mail indicator in mode line of Emacs -*-coding: utf-8 -*-
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;; Copyright (C) 1985, 1986, 1987, 1993, 1994, 1996, 2000, 2001, 2002,
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;;   2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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;; Maintainer: FSF

;; This file is part of GNU Emacs.

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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
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;; 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
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:

;; Facilities to display current time/date and a new-mail indicator
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;; in the Emacs mode line.  The entry point is `display-time'.

;; Display time world in a buffer, the entry point is
;; `display-time-world'.
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;;; Code:

(defgroup display-time nil
  "Display time and load in mode line of Emacs."
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  :group 'mode-line
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  :group 'mail)


(defcustom display-time-mail-file nil
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  "File name of mail inbox file, for indicating existence of new mail.
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Non-nil and not a string means don't check for mail; nil means use
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default, which is system-dependent, and is the same as used by Rmail."
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  :type '(choice (const :tag "None" none)
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		 (const :tag "Default" nil)
		 (file :format "%v"))
  :group 'display-time)

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(defcustom display-time-mail-directory nil
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  "Name of mail inbox directory, for indicating existence of new mail.
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Any nonempty regular file in the directory is regarded as newly arrived mail.
If nil, do not check a directory for arriving mail."
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  :type '(choice (const :tag "None" nil)
		 (directory :format "%v"))
  :group 'display-time)

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(defcustom display-time-mail-function nil
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  "Function to call, for indicating existence of new mail.
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If nil, that means use the default method: check that the file
specified by `display-time-mail-file' is nonempty or that the
directory `display-time-mail-directory' contains nonempty files."
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  :type '(choice (const :tag "Default" nil)
		 (function))
  :group 'display-time)

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(defcustom display-time-default-load-average 0
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  "Which load average value will be shown in the mode line.
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Almost every system can provide values of load for past 1 minute, past 5 or
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past 15 minutes.  The default is to display 1 minute load average.
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The value can be one of:

  0   => 1 minute load
  1   => 5 minutes load
  2   => 15 minutes load"
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  :type '(choice (const :tag "1 minute load" 0)
		 (const :tag "5 minutes load" 1)
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		 (const :tag "15 minutes load" 2)
		 (const :tag "None" nil))
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  :group 'display-time)

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(defvar display-time-load-average nil
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  "Load average currently being shown in mode line.")
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(defcustom display-time-load-average-threshold 0.1
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  "Load-average values below this value won't be shown in the mode line."
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  :type 'number
  :group 'display-time)
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;;;###autoload
(defcustom display-time-day-and-date nil "\
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Non-nil means \\[display-time] should display day and date as well as time."
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  :type 'boolean
  :group 'display-time)

(defvar display-time-timer nil)

(defcustom display-time-interval 60
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  "Seconds between updates of time in the mode line."
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  :type 'integer
  :group 'display-time)

(defcustom display-time-24hr-format nil
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  "Non-nil indicates time should be displayed as hh:mm, 0 <= hh <= 23.
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A value of nil means 1 <= hh <= 12, and an AM/PM suffix is used."
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  :type 'boolean
  :group 'display-time)

(defvar display-time-string nil)
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;;;###autoload(put 'display-time-string 'risky-local-variable t)
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(defcustom display-time-hook nil
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  "List of functions to be called when the time is updated on the mode line."
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  :type 'hook
  :group 'display-time)

(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.")

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(defcustom zoneinfo-style-world-list
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  '(("America/Los_Angeles" "Seattle")
    ("America/New_York" "New York")
    ("Europe/London" "London")
    ("Europe/Paris" "Paris")
    ("Asia/Calcutta" "Bangalore")
    ("Asia/Tokyo" "Tokyo"))
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  "Alist of zoneinfo-style time zones and places for `display-time-world'.
Each element has the form (TIMEZONE LABEL).
TIMEZONE should be a string of the form AREA/LOCATION, where AREA is
the name of a region -- a continent or ocean, and LOCATION is the name
of a specific location, e.g., a city, within that region.
LABEL is a string to display as the label of that TIMEZONE's time."
  :group 'display-time
  :type '(repeat (list string string))
  :version "23.1")

(defcustom legacy-style-world-list
  '(("PST8PDT" "Seattle")
    ("EST5EDT" "New York")
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    ("GMT0BST" "London")
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    ("CET-1CDT" "Paris")
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    ("IST-5:30" "Bangalore")
    ("JST-9" "Tokyo"))
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  "Alist of traditional-style time zones and places for `display-time-world'.
Each element has the form (TIMEZONE LABEL).
TIMEZONE should be a string of the form:

     std[+|-]offset[dst[offset][,date[/time],date[/time]]]

See the documentation of the TZ environment variable on your system,
for more details about the format of TIMEZONE.
LABEL is a string to display as the label of that TIMEZONE's time."
  :group 'display-time
  :type '(repeat (list string string))
  :version "23.1")

(defcustom display-time-world-list
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  ;; Determine if zoneinfo style timezones are supported by testing that
  ;; America/New York and Europe/London return different timezones.
  (let (gmt nyt)
    (set-time-zone-rule "America/New York")
    (setq nyt (format-time-string "%z"))
    (set-time-zone-rule "Europe/London")
    (setq gmt (format-time-string "%z"))
    (set-time-zone-rule nil)
    (if (string-equal nyt gmt)
        legacy-style-world-list
      zoneinfo-style-world-list))
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  "Alist of time zones and places for `display-time-world' to display.
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Each element has the form (TIMEZONE LABEL).
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TIMEZONE should be in the format supported by `set-time-zone-rule' on
your system.  See the documentation of `zoneinfo-style-world-list' and
\`legacy-style-world-list' for two widely used formats.
LABEL is a string to display as the label of that TIMEZONE's time."
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  :group 'display-time
  :type '(repeat (list string string))
  :version "23.1")

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(defcustom display-time-world-time-format "%A %d %B %R %Z"
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  "Format of the time displayed, see `format-time-string'."
  :group 'display-time
  :type 'string
  :version "23.1")

(defcustom display-time-world-buffer-name "*wclock*"
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  "Name of the world clock buffer."
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  :group 'display-time
  :type 'string
  :version "23.1")

(defcustom display-time-world-timer-enable t
  "If non-nil, a timer will update the world clock."
  :group 'display-time
  :type 'boolean
  :version "23.1")

(defcustom display-time-world-timer-second 60
  "Interval in seconds for updating the world clock."
  :group 'display-time
  :type 'integer
  :version "23.1")

(defvar display-time-world-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "q" 'kill-this-buffer)
    map)
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  "Keymap of Display Time World mode.")
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;;;###autoload
(defun display-time ()
  "Enable display of time, load level, and mail flag in mode lines.
This display updates automatically every minute.
If `display-time-day-and-date' is non-nil, the current day and date
are displayed as well.
This runs the normal hook `display-time-hook' after each update."
  (interactive)
  (display-time-mode 1))

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;; This business used to be simpler when all mode lines had the same
;; face and the image could just be pbm.  Now we try to rely on an xpm
;; image with a transparent background.  Otherwise, set the background
;; for pbm.

(defcustom display-time-mail-face nil
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  "Face to use for `display-time-mail-string'.
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If `display-time-use-mail-icon' is non-nil, the image's
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background color is the background of this face.  Set this to
make the mail indicator stand out on a color display."
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  :group 'mode-line-faces
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  :group 'display-time
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  :version "22.1"
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  :type '(choice (const :tag "None" nil) face))
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(defvar display-time-mail-icon
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  (find-image '((:type xpm :file "letter.xpm" :ascent center)
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		(:type pbm :file "letter.pbm" :ascent center)))
  "Image specification to offer as the mail indicator on a graphic display.
See `display-time-use-mail-icon' and `display-time-mail-face'.")
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;; Fixme: Default to icon on graphical display?
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(defcustom display-time-use-mail-icon nil
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  "Non-nil means use an icon as mail indicator on a graphic display.
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Otherwise use `display-time-mail-string'.  The icon may consume less
of the mode line.  It is specified by `display-time-mail-icon'."
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  :group 'display-time
  :type 'boolean)

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;; Fixme: maybe default to the character if we can display Unicode.
(defcustom display-time-mail-string "Mail"
  "String to use as the mail indicator in `display-time-string-forms'.
This can use the Unicode letter character if you can display it."
  :group 'display-time
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  :version "22.1"
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  :type '(choice (const "Mail")
		 ;; Use :tag here because the Lucid menu won't display
		 ;; multibyte text.
		 (const :tag "Unicode letter character" "")
		 string))

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(defcustom display-time-format nil
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  "String specifying format for displaying the time in the mode line.
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See the function `format-time-string' for an explanation of
how to write this string.  If this is nil, the defaults
depend on `display-time-day-and-date' and `display-time-24hr-format'."
  :type '(choice (const :tag "Default" nil)
		 string)
  :group 'display-time)

(defcustom display-time-string-forms
  '((if (and (not display-time-format) display-time-day-and-date)
	(format-time-string "%a %b %e " now)
      "")
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    (propertize
     (format-time-string (or display-time-format
			     (if display-time-24hr-format "%H:%M" "%-I:%M%p"))
			 now)
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     'help-echo (format-time-string "%a %b %e, %Y" now))
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    load
    (if mail
	;; Build the string every time to act on customization.
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	;; :set-after doesn't help for `customize-option'.  I think it
	;; should.
	(concat
	 " "
	 (propertize
	  display-time-mail-string
	  'display `(when (and display-time-use-mail-icon
			       (display-graphic-p))
		      ,@display-time-mail-icon
		      ,@(if (and display-time-mail-face
				 (memq (plist-get (cdr display-time-mail-icon)
						  :type)
				       '(pbm xbm)))
			    (let ((bg (face-attribute display-time-mail-face
						      :background)))
			      (if (stringp bg)
				  (list :background bg)))))
	  'face display-time-mail-face
	  'help-echo "You have new mail; mouse-2: Read mail"
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	  'mouse-face 'mode-line-highlight
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	  'local-map (make-mode-line-mouse-map 'mouse-2
					       read-mail-command)))
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      ""))
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  "List of expressions governing display of the time in the mode line.
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For most purposes, you can control the time format using `display-time-format'
which is a more standard interface.

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)'."
  :type 'sexp
  :group 'display-time)

(defun display-time-event-handler ()
  (display-time-update)
  ;; Do redisplay right now, if no input pending.
  (sit-for 0)
  (let* ((current (current-time))
	 (timer display-time-timer)
	 ;; Compute the time when this timer will run again, next.
	 (next-time (timer-relative-time
		     (list (aref timer 1) (aref timer 2) (aref timer 3))
		     (* 5 (aref timer 4)) 0)))
    ;; If the activation time is far in the past,
    ;; skip executions until we reach a time in the future.
    ;; This avoids a long pause if Emacs has been suspended for hours.
    (or (> (nth 0 next-time) (nth 0 current))
	(and (= (nth 0 next-time) (nth 0 current))
	     (> (nth 1 next-time) (nth 1 current)))
	(and (= (nth 0 next-time) (nth 0 current))
	     (= (nth 1 next-time) (nth 1 current))
	     (> (nth 2 next-time) (nth 2 current)))
	(progn
	  (timer-set-time timer (timer-next-integral-multiple-of-time
				 current display-time-interval)
			  display-time-interval)
	  (timer-activate timer)))))

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(defun display-time-next-load-average ()
  (interactive)
  (if (= 3 (setq display-time-load-average (1+ display-time-load-average)))
      (setq display-time-load-average 0))
  (display-time-update)
  (sit-for 0))

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(defun display-time-mail-check-directory ()
  (let ((mail-files (directory-files display-time-mail-directory t))
	(size 0))
    (while (and mail-files (= size 0))
      ;; Count size of regular files only.
      (setq size (+ size (or (and (file-regular-p (car mail-files))
				  (nth 7 (file-attributes (car mail-files))))
			     0)))
      (setq mail-files (cdr mail-files)))
    (if (> size 0)
	size
      nil)))

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(defun display-time-update ()
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  "Update the display-time info for the mode line.
However, don't redisplay right now.

This is used for things like Rmail `g' that want to force an
update which can wait for the next redisplay."
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  (let* ((now (current-time))
	 (time (current-time-string now))
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         (load (if (null display-time-load-average)
		   ""
		 (condition-case ()
		     ;; Do not show values less than
		     ;; `display-time-load-average-threshold'.
		     (if (> (* display-time-load-average-threshold 100)
			    (nth display-time-load-average (load-average)))
			 ""
		       ;; The load average number is mysterious, so
		       ;; provide some help.
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		       (let ((str (format " %03d"
					  (nth display-time-load-average
					       (load-average)))))
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			 (propertize
			  (concat (substring str 0 -2) "." (substring str -2))
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			  'local-map (make-mode-line-mouse-map
				      'mouse-2 'display-time-next-load-average)
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			  'mouse-face 'mode-line-highlight
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			  'help-echo (concat
				      "System load average for past "
				      (if (= 0 display-time-load-average)
					  "1 minute"
					(if (= 1 display-time-load-average)
					    "5 minutes"
					  "15 minutes"))
				      "; mouse-2: next"))))
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		   (error ""))))
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         (mail-spool-file (or display-time-mail-file
                              (getenv "MAIL")
                              (concat rmail-spool-directory
                                      (user-login-name))))
	 (mail (or (and display-time-mail-function
			(funcall display-time-mail-function))
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		   (and display-time-mail-directory
			(display-time-mail-check-directory))
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		   (and (stringp mail-spool-file)
			(or (null display-time-server-down-time)
			    ;; If have been down for 20 min, try again.
			    (> (- (nth 1 now) display-time-server-down-time)
			       1200)
			    (and (< (nth 1 now) display-time-server-down-time)
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				 (> (- (nth 1 now)
				       display-time-server-down-time)
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				    -64336)))
			(let ((start-time (current-time)))
			  (prog1
			      (display-time-file-nonempty-p mail-spool-file)
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			    (if (> (- (nth 1 (current-time))
				      (nth 1 start-time))
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				   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))
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         (hour (string-to-number 24-hours))
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         (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))

(defun display-time-file-nonempty-p (file)
  (and (file-exists-p file)
       (< 0 (nth 7 (file-attributes (file-chase-links file))))))

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;;;###autoload
(define-minor-mode display-time-mode
  "Toggle display of time, load level, and mail flag in mode lines.
With a numeric arg, enable this display if arg is positive.

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When this display is enabled, it updates automatically every minute
\(you can control the number of seconds between updates by
customizing `display-time-interval').
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If `display-time-day-and-date' is non-nil, the current day and date
are displayed as well.
This runs the normal hook `display-time-hook' after each update."
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  :global t :group 'display-time
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  (and display-time-timer (cancel-timer display-time-timer))
  (setq display-time-timer nil)
  (setq display-time-string "")
  (or global-mode-string (setq global-mode-string '("")))
  (setq display-time-load-average display-time-default-load-average)
  (if display-time-mode
      (progn
	(or (memq 'display-time-string global-mode-string)
	    (setq global-mode-string
		  (append global-mode-string '(display-time-string))))
	;; Set up the time timer.
	(setq display-time-timer
	      (run-at-time t display-time-interval
			   'display-time-event-handler))
	;; Make the time appear right away.
	(display-time-update)
	;; When you get new mail, clear "Mail" from the mode line.
	(add-hook 'rmail-after-get-new-mail-hook
		  'display-time-event-handler))
    (remove-hook 'rmail-after-get-new-mail-hook
		 'display-time-event-handler)))
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(defun display-time-world-mode ()
  "Major mode for buffer that displays times in various time zones.
See `display-time-world'."
  (interactive)
  (kill-all-local-variables)
  (setq
   major-mode 'display-time-world-mode
   mode-name "World clock")
  (use-local-map display-time-world-mode-map))

(defun display-time-world-display (alist)
  "Replace current buffer text with times in various zones, based on ALIST."
  (let ((inhibit-read-only t)
	(buffer-undo-list t))
    (erase-buffer)
    (let ((max-width 0)
	  (result ()))
      (unwind-protect
	  (dolist (zone alist)
	    (let* ((label (cadr zone))
		   (width (string-width label)))
	      (set-time-zone-rule (car zone))
	      (setq result
		    (append result
			    (list
			     label width
			     (format-time-string display-time-world-time-format))))
	      (when (> width max-width)
		(setq max-width width))))
	(set-time-zone-rule nil))
      (while result
	(insert (pop result)
		(make-string (1+ (- max-width (pop result))) ?\s)
		(pop result) "\n")))
    (delete-backward-char 1)))

;;;###autoload
(defun display-time-world ()
  "Enable updating display of times in various time zones.
`display-time-world-list' specifies the zones.
To turn off the world time display, go to that window and type `q'."
  (interactive)
  (when (and display-time-world-timer-enable
             (not (get-buffer display-time-world-buffer-name)))
    (run-at-time t display-time-world-timer-second 'display-time-world-timer))
  (with-current-buffer (get-buffer-create display-time-world-buffer-name)
    (display-time-world-display display-time-world-list))
  (pop-to-buffer display-time-world-buffer-name)
  (fit-window-to-buffer)
  (display-time-world-mode))

(defun display-time-world-timer ()
  (if (get-buffer display-time-world-buffer-name)
      (with-current-buffer (get-buffer display-time-world-buffer-name)
        (display-time-world-display display-time-world-list))
    ;; cancel timer
    (let ((list timer-list))
      (while list
        (let ((elt (pop list)))
          (when (equal (symbol-name (aref elt 5)) "display-time-world-timer")
            (cancel-timer elt)))))))

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;;;###autoload
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(defun emacs-uptime (&optional format)
  "Return a string giving the uptime of this instance of Emacs.
FORMAT is a string to format the result, using `format-seconds'.
For example, the Unix uptime command format is \"%D, %z%2h:%.2m\"."
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  (interactive)
  (let ((str
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         (format-seconds (or format "%Y, %D, %H, %M, %z%S")
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                         (float-time
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                          (time-subtract (current-time) before-init-time)))))
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    (if (called-interactively-p 'interactive)
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        (message "%s" str)
      str)))

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;;;###autoload
(defun emacs-init-time ()
  "Return a string giving the duration of the Emacs initialization."
  (interactive)
  (let ((str
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	 (format "%.1f seconds"
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		 (float-time
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		  (time-subtract after-init-time before-init-time)))))
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    (if (called-interactively-p 'interactive)
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        (message "%s" str)
      str)))

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(provide 'time)

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;; arch-tag: b9c1623f-b5cb-48e4-b650-482a4d23c5a6
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;;; time.el ends here