mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-26 10:49:33 +00:00
263 lines
9.4 KiB
EmacsLisp
263 lines
9.4 KiB
EmacsLisp
;;; time.el --- display time and load in mode line of Emacs.
|
|
|
|
;; Copyright (C) 1985, 86, 87, 93, 94, 1996 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, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, 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:
|
|
|
|
(defgroup display-time nil
|
|
"Display time and load in mode line of Emacs."
|
|
:group 'modeline
|
|
:group 'mail)
|
|
|
|
|
|
(defcustom display-time-mode nil
|
|
"Toggle display of time, load level, and mail flag in mode lines.
|
|
You must modify via \\[customize] for this variable to have an effect."
|
|
:set (lambda (symbol value)
|
|
(display-time-mode (or value 0)))
|
|
:initialize 'custom-initialize-default
|
|
:type 'boolean
|
|
:group 'display-time
|
|
:require 'time
|
|
:version "20.3")
|
|
|
|
|
|
(defcustom 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."
|
|
:type '(choice (const :tag "Default" nil)
|
|
(file :format "%v"))
|
|
:group 'display-time)
|
|
|
|
;;;###autoload
|
|
(defcustom display-time-day-and-date nil "\
|
|
*Non-nil means \\[display-time] should display day and date as well as time."
|
|
:type 'boolean
|
|
:group 'display-time)
|
|
|
|
(defvar display-time-timer nil)
|
|
|
|
(defcustom display-time-interval 60
|
|
"*Seconds between updates of time in the mode line."
|
|
:type 'integer
|
|
:group 'display-time)
|
|
|
|
(defcustom 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."
|
|
:type 'boolean
|
|
:group 'display-time)
|
|
|
|
(defvar display-time-string nil)
|
|
|
|
(defcustom display-time-hook nil
|
|
"*List of functions to be called when the time is updated on the mode line."
|
|
: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.")
|
|
|
|
;;;###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))
|
|
|
|
;;;###autoload
|
|
(defun display-time-mode (arg)
|
|
"Toggle display of time, load level, and mail flag in mode lines.
|
|
With a numeric arg, enable this display if arg is positive.
|
|
|
|
When this display is enabled, it 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 "P")
|
|
(let ((on (if (null arg)
|
|
(not display-time-timer)
|
|
(> (prefix-numeric-value arg) 0))))
|
|
(setq display-time-mode on)
|
|
(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 '("")))
|
|
(if on
|
|
(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))))
|
|
|
|
|
|
(defcustom display-time-format nil
|
|
"*A string specifying the format for displaying the time in the mode line.
|
|
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)
|
|
"")
|
|
(format-time-string (or display-time-format
|
|
(if display-time-24hr-format "%H:%M" "%-I:%M%p"))
|
|
now)
|
|
load
|
|
(if mail " Mail" ""))
|
|
"*A list of expressions governing display of the time in the mode line.
|
|
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)))))
|
|
|
|
;; Update the display-time info for the mode line
|
|
;; but 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.
|
|
(defun display-time-update ()
|
|
(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))
|
|
|
|
(defun display-time-file-nonempty-p (file)
|
|
(and (file-exists-p file)
|
|
(< 0 (nth 7 (file-attributes (file-chase-links file))))))
|
|
|
|
(if display-time-mode
|
|
(display-time-mode t))
|
|
|
|
(provide 'time)
|
|
|
|
;;; time.el ends here
|