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247 lines
8.9 KiB
EmacsLisp
247 lines
8.9 KiB
EmacsLisp
;;; time.el --- display time and load in mode line of Emacs.
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;; Copyright (C) 1985, 86, 87, 93, 94, 1996 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; 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 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Facilities to display current time/date and a new-mail indicator
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;; in the Emacs mode line. The single entry point is `display-time'.
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;;; Code:
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(defgroup display-time nil
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"Display time and load in mode line of Emacs."
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:group 'modeline
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:group 'mail)
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(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 "Default" nil)
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(file :format "%v"))
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:group 'display-time)
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;;;###autoload
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(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
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:group 'display-time)
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(defvar display-time-timer nil)
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(defcustom display-time-interval 60
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"*Seconds between updates of time in the mode line."
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:type 'integer
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:group 'display-time)
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(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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Nil means 1 <= hh <= 12, and an AM/PM suffix is used."
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:type 'boolean
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:group 'display-time)
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(defvar display-time-string nil)
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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
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:group 'display-time)
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(defvar display-time-server-down-time nil
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"Time when mail file's file system was recorded to be down.
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If that file system seems to be up, the value is nil.")
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;;;###autoload
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(defun display-time ()
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"Enable display of time, load level, and mail flag in mode lines.
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This display updates automatically every minute.
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If `display-time-day-and-date' is non-nil, the current day and date
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are displayed as well.
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This runs the normal hook `display-time-hook' after each update."
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(interactive)
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(display-time-mode 1))
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;;;###autoload
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(defun display-time-mode (arg)
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"Toggle display of time, load level, and mail flag in mode lines.
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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.
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If `display-time-day-and-date' is non-nil, the current day and date
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are displayed as well.
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This runs the normal hook `display-time-hook' after each update."
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(interactive "P")
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(let ((on (if (null arg)
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(not display-time-timer)
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(> (prefix-numeric-value arg) 0))))
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(and display-time-timer (cancel-timer display-time-timer))
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(setq display-time-timer nil)
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(setq display-time-string "")
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(or global-mode-string (setq global-mode-string '("")))
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(if on
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(progn
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(or (memq 'display-time-string global-mode-string)
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(setq global-mode-string
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(append global-mode-string '(display-time-string))))
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;; Set up the time timer.
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(setq display-time-timer
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(run-at-time t display-time-interval
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'display-time-event-handler))
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;; Make the time appear right away.
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(display-time-update)
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;; When you get new mail, clear "Mail" from the mode line.
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(add-hook 'rmail-after-get-new-mail-hook
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'display-time-event-handler))
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(remove-hook 'rmail-after-get-new-mail-hook
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'display-time-event-handler))))
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(defcustom display-time-format nil
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"*A string specifying the format for displaying the time in the mode line.
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See the function `format-time-string' for an explanation of
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how to write this string. If this is nil, the defaults
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depend on `display-time-day-and-date' and `display-time-24hr-format'."
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:type '(choice (const :tag "Default" nil)
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string)
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:group 'display-time)
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(defcustom display-time-string-forms
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'((if (and (not display-time-format) display-time-day-and-date)
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(format-time-string "%a %b %e " now)
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"")
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(format-time-string (or display-time-format
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(if display-time-24hr-format "%H:%m" "%-I:%M%p"))
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now)
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load
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(if mail " Mail" ""))
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"*A 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'
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which is a more standard interface.
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This expression is a list of expressions that can involve the keywords
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`load', `day', `month', and `year', `12-hours', `24-hours', `minutes',
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`seconds', all numbers in string form, and `monthname', `dayname', `am-pm',
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and `time-zone' all alphabetic strings, and `mail' a true/nil value.
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For example, the form
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'((substring year -2) \"/\" month \"/\" day
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\" \" 24-hours \":\" minutes \":\" seconds
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(if time-zone \" (\") time-zone (if time-zone \")\")
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(if mail \" Mail\" \"\"))
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would give mode line times like `94/12/30 21:07:48 (UTC)'."
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:type 'sexp
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:group 'display-time)
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(defun display-time-event-handler ()
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(display-time-update)
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;; Do redisplay right now, if no input pending.
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(sit-for 0)
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(let* ((current (current-time))
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(timer display-time-timer)
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;; Compute the time when this timer will run again, next.
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(next-time (timer-relative-time
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(list (aref timer 1) (aref timer 2) (aref timer 3))
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(* 5 (aref timer 4)) 0)))
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;; If the activation time is far in the past,
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;; skip executions until we reach a time in the future.
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;; This avoids a long pause if Emacs has been suspended for hours.
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(or (> (nth 0 next-time) (nth 0 current))
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(and (= (nth 0 next-time) (nth 0 current))
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(> (nth 1 next-time) (nth 1 current)))
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(and (= (nth 0 next-time) (nth 0 current))
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(= (nth 1 next-time) (nth 1 current))
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(> (nth 2 next-time) (nth 2 current)))
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(progn
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(timer-set-time timer (timer-next-integral-multiple-of-time
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current display-time-interval)
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display-time-interval)
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(timer-activate timer)))))
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;; Update the display-time info for the mode line
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;; but don't redisplay right now. This is used for
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;; things like Rmail `g' that want to force an update
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;; which can wait for the next redisplay.
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(defun display-time-update ()
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(let* ((now (current-time))
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(time (current-time-string now))
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(load (condition-case ()
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(if (zerop (car (load-average))) ""
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(let ((str (format " %03d" (car (load-average)))))
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(concat (substring str 0 -2) "." (substring str -2))))
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(error "")))
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(mail-spool-file (or display-time-mail-file
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(getenv "MAIL")
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(concat rmail-spool-directory
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(user-login-name))))
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(mail (and (stringp mail-spool-file)
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(or (null display-time-server-down-time)
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;; If have been down for 20 min, try again.
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(> (- (nth 1 (current-time))
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display-time-server-down-time)
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1200))
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(let ((start-time (current-time)))
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(prog1
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(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)
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;; Record that mail file is not accessible.
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(setq display-time-server-down-time
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(nth 1 (current-time)))
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;; Record that mail file is accessible.
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(setq display-time-server-down-time nil))))))
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(24-hours (substring time 11 13))
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(hour (string-to-int 24-hours))
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(12-hours (int-to-string (1+ (% (+ hour 11) 12))))
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(am-pm (if (>= hour 12) "pm" "am"))
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(minutes (substring time 14 16))
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(seconds (substring time 17 19))
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(time-zone (car (cdr (current-time-zone now))))
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(day (substring time 8 10))
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(year (substring time 20 24))
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(monthname (substring time 4 7))
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(month
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(cdr
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(assoc
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monthname
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'(("Jan" . "1") ("Feb" . "2") ("Mar" . "3") ("Apr" . "4")
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("May" . "5") ("Jun" . "6") ("Jul" . "7") ("Aug" . "8")
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("Sep" . "9") ("Oct" . "10") ("Nov" . "11") ("Dec" . "12")))))
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(dayname (substring time 0 3)))
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(setq display-time-string
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(mapconcat 'eval display-time-string-forms ""))
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;; This is inside the let binding, but we are not going to document
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;; what variables are available.
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(run-hooks 'display-time-hook))
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(force-mode-line-update))
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(defun display-time-file-nonempty-p (file)
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(and (file-exists-p file)
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(< 0 (nth 7 (file-attributes (file-chase-links file))))))
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(provide 'time)
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;;; time.el ends here
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