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642 lines
23 KiB
EmacsLisp
642 lines
23 KiB
EmacsLisp
;;; time.el --- display time, load and mail indicator in mode line of Emacs -*- lexical-binding: t -*-
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;; Copyright (C) 1985-1987, 1993-1994, 1996, 2000-2021 Free Software
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;; Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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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 3 of the License, or
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;; (at your option) 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. If not, see <https://www.gnu.org/licenses/>.
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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 entry point is `display-time'.
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;; Use `world-clock' to display world clock in a buffer.
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;;; Code:
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(eval-when-compile (require 'subr-x))
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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 'mode-line
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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 "None" none)
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(const :tag "Default" nil)
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(file :format "%v")))
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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.
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If nil, do not check a directory for arriving mail."
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:type '(choice (const :tag "None" nil)
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(directory :format "%v")))
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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
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specified by `display-time-mail-file' is nonempty or that the
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directory `display-time-mail-directory' contains nonempty files."
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:type '(choice (const :tag "Default" nil)
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(function)))
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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 the past 1 minute,
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past 5 or past 15 minutes. The default is to display 1-minute load average.
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The value can be one of:
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0 => 1 minute load
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1 => 5 minutes load
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2 => 15 minutes load
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nil => None (do not display the load average)"
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:type '(choice (const :tag "1 minute load" 0)
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(const :tag "5 minutes load" 1)
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(const :tag "15 minutes load" 2)
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(const :tag "None" nil)))
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(defvar display-time-load-average nil
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"Value of the system's load average currently shown on the mode line.
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See `display-time-default-load-average'.
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This is an internal variable; setting it has no effect.")
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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)
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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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(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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(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)
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(defvar display-time-string nil
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"String used in mode lines to display a time string.
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It should not be set directly, but is instead updated by the
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`display-time' function.")
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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)
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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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;; This business used to be simpler when all mode lines had the same
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;; face and the image could just be pbm. Now we try to rely on an xpm
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;; image with a transparent background. Otherwise, set the background
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;; for pbm.
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(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
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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)))
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"Image specification to offer as the mail indicator on a graphic display.
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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
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of the mode line. It is specified by `display-time-mail-icon'."
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:type 'boolean)
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;; Fixme: maybe default to the character if we can display Unicode.
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(defcustom display-time-mail-string "Mail"
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"String to use as the mail indicator in `display-time-string-forms'.
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This can use the Unicode letter character if you can display it."
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:version "22.1"
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:type '(choice (const "Mail")
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;; Use :tag here because the Lucid menu won't display
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;; multibyte text.
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(const :tag "Unicode letter character" "✉")
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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
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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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(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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(propertize
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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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'help-echo (format-time-string "%a %b %e, %Y" now))
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load
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(if mail
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;; Build the string every time to act on customization.
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;; :set-after doesn't help for `customize-option'. I think it
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;; should.
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(concat
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" "
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(propertize
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display-time-mail-string
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'display `(when (and display-time-use-mail-icon
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(display-graphic-p))
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,@display-time-mail-icon
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,@(if (and display-time-mail-face
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(memq (plist-get (cdr display-time-mail-icon)
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:type)
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'(pbm xbm)))
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(let ((bg (face-attribute display-time-mail-face
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:background)))
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(if (stringp bg)
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(list :background bg)))))
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'face display-time-mail-face
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'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
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read-mail-command)))
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"")
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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'
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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:
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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 '(repeat sexp))
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(defun display-time-event-handler ()
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(display-time-update)
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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 not in the future,
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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 (time-less-p current next-time)
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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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(defun display-time-next-load-average ()
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"Switch between different load averages in the mode line.
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Switches from the 1 to 5 to 15 minute load average, and then back to 1."
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(interactive)
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(if (= 3 (setq display-time-load-average (1+ display-time-load-average)))
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(setq display-time-load-average 0))
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(display-time-update))
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(defun display-time-mail-check-directory ()
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(let ((mail-files (directory-files display-time-mail-directory t))
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(size 0))
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(while (and mail-files (= size 0))
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;; Count size of regular files only.
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(setq size (+ size (or (and (file-regular-p (car mail-files))
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(file-attribute-size
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(file-attributes (car mail-files))))
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0)))
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(setq mail-files (cdr mail-files)))
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(if (> size 0)
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size
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nil)))
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(with-no-warnings
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;; Warnings are suppressed to avoid "global/dynamic var `X' lacks a prefix".
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(defvar now)
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(defvar time)
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(defvar load)
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(defvar mail)
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(defvar 24-hours)
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(defvar hour)
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(defvar 12-hours)
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(defvar am-pm)
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(defvar minutes)
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(defvar seconds)
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(defvar time-zone)
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(defvar day)
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(defvar year)
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(defvar monthname)
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(defvar month)
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(defvar dayname))
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(defun display-time-update--load ()
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(if (null display-time-load-average)
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""
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(condition-case ()
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;; Do not show values less than
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;; `display-time-load-average-threshold'.
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(if (> (* display-time-load-average-threshold 100)
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(nth display-time-load-average (load-average)))
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""
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;; The load average number is mysterious, so
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;; provide some help.
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(let ((str (format " %03d"
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(nth display-time-load-average
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(load-average)))))
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(propertize
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(concat (substring str 0 -2) "." (substring str -2))
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'local-map (make-mode-line-mouse-map
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'mouse-2 'display-time-next-load-average)
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'mouse-face 'mode-line-highlight
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'help-echo (concat
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"System load average for past "
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(if (= 0 display-time-load-average)
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"1 minute"
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(if (= 1 display-time-load-average)
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"5 minutes"
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"15 minutes"))
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"; mouse-2: next"))))
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(error ""))))
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(defun display-time-update--mail ()
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(let ((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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(cond
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(display-time-mail-function
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(funcall display-time-mail-function))
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(display-time-mail-directory
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(display-time-mail-check-directory))
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((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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(time-less-p 1200 (time-since
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display-time-server-down-time))))
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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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;; Record whether mail file is accessible.
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(setq display-time-server-down-time
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(let ((end-time (current-time)))
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(and (time-less-p 20 (time-subtract
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end-time start-time))
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(float-time end-time))))))))))
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(defun display-time-update ()
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"Update the `display-time' info for the mode line.
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However, don't redisplay right now.
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This is used for things like Rmail `g' that want to force an
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update which can wait for the next redisplay."
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(let* ((now (current-time))
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(time (current-time-string now))
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(load (display-time-update--load))
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(mail (display-time-update--mail))
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(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))))
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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 (format-time-string "%Y" now))
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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 'all))
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(defun display-time-file-nonempty-p (file)
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(let ((remote-file-name-inhibit-cache (- display-time-interval 5)))
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(and (file-exists-p file)
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(< 0 (file-attribute-size
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(file-attributes (file-chase-links file)))))))
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;;;###autoload
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(define-minor-mode display-time-mode
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"Toggle display of time, load level, and mail flag in mode lines.
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When Display Time mode is enabled, it updates every minute (you
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can control the number of seconds between updates by customizing
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`display-time-interval'). If `display-time-day-and-date' is
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non-nil, the current day and date are displayed as well. This
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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))
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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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(setq display-time-load-average display-time-default-load-average)
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(if display-time-mode
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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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;;; Obsolete names
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(define-obsolete-variable-alias 'display-time-world-list
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'world-clock-list "28.1")
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(define-obsolete-variable-alias 'display-time-world-time-format
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'world-clock-time-format "28.1")
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(define-obsolete-variable-alias 'display-time-world-buffer-name
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'world-clock-buffer-name "28.1")
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(define-obsolete-variable-alias 'display-time-world-timer-enable
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'world-clock-timer-enable "28.1")
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(define-obsolete-variable-alias 'display-time-world-timer-second
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'world-clock-timer-second "28.1")
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(define-obsolete-function-alias 'display-time-world-mode
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#'world-clock-mode "28.1")
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(define-obsolete-function-alias 'display-time-world-display
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#'world-clock-display "28.1")
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(define-obsolete-function-alias 'display-time-world-timer
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#'world-clock-update "28.1")
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;;; World clock
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(defgroup world-clock nil
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"Display a world clock."
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:group 'display-time)
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(defcustom zoneinfo-style-world-list
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'(("America/Los_Angeles" "Seattle")
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("America/New_York" "New York")
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("Europe/London" "London")
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("Europe/Paris" "Paris")
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("Asia/Calcutta" "Bangalore")
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("Asia/Tokyo" "Tokyo"))
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"Alist of zoneinfo-style time zones and places for `world-clock'.
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Each element has the form (TIMEZONE LABEL).
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TIMEZONE should be a string of the form AREA/LOCATION, where AREA is
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the name of a region -- a continent or ocean, and LOCATION is the name
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of a specific location, e.g., a city, within that region.
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LABEL is a string to display as the label of that TIMEZONE's time."
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:type '(repeat (list string string))
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:version "23.1")
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(defcustom legacy-style-world-list
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'(("PST8PDT" "Seattle")
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("EST5EDT" "New York")
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("GMT0BST" "London")
|
||
("CET-1CDT" "Paris")
|
||
("IST-5:30" "Bangalore")
|
||
("JST-9" "Tokyo"))
|
||
"Alist of traditional-style time zones and places for `world-clock'.
|
||
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."
|
||
:type '(repeat (list string string))
|
||
:version "23.1")
|
||
|
||
(defcustom world-clock-list t
|
||
"Alist of time zones and places for `world-clock' to display.
|
||
Each element has the form (TIMEZONE LABEL).
|
||
TIMEZONE should be in a format supported by 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.
|
||
|
||
If the value is t instead of an alist, use the value of
|
||
`zoneinfo-style-world-list' if it works on this platform, and of
|
||
`legacy-style-world-list' otherwise."
|
||
:type '(choice (const :tag "Default" t)
|
||
(repeat :tag "List of zones and labels"
|
||
(list (string :tag "Zone") (string :tag "Label"))))
|
||
:version "28.1")
|
||
|
||
(defun time--display-world-list ()
|
||
(if (listp world-clock-list)
|
||
world-clock-list
|
||
;; Determine if zoneinfo style timezones are supported by testing that
|
||
;; America/New York and Europe/London return different timezones.
|
||
(let ((nyt (format-time-string "%z" nil "America/New_York"))
|
||
(gmt (format-time-string "%z" nil "Europe/London")))
|
||
(if (string-equal nyt gmt)
|
||
legacy-style-world-list
|
||
zoneinfo-style-world-list))))
|
||
|
||
(defcustom world-clock-time-format "%A %d %B %R %Z"
|
||
"Time format for `world-clock', see `format-time-string'."
|
||
:type 'string
|
||
:version "28.1")
|
||
|
||
(defcustom world-clock-buffer-name "*wclock*"
|
||
"Name of the `world-clock' buffer."
|
||
:type 'string
|
||
:version "28.1")
|
||
|
||
(defcustom world-clock-timer-enable t
|
||
"If non-nil, a timer will update the `world-clock' buffer."
|
||
:type 'boolean
|
||
:version "28.1")
|
||
|
||
(defcustom world-clock-timer-second 60
|
||
"Interval in seconds for updating the `world-clock' buffer."
|
||
:type 'integer
|
||
:version "28.1")
|
||
|
||
(defface world-clock-label
|
||
'((t :inherit font-lock-variable-name-face))
|
||
"Face for time zone label in `world-clock' buffer.")
|
||
|
||
(defvar world-clock-mode-map
|
||
(let ((map (make-sparse-keymap)))
|
||
(define-key map "n" #'next-line)
|
||
(define-key map "p" #'previous-line)
|
||
map))
|
||
|
||
(define-derived-mode world-clock-mode special-mode "World clock"
|
||
"Major mode for buffer that displays times in various time zones.
|
||
See `world-clock'."
|
||
:interactive nil
|
||
(setq-local revert-buffer-function #'world-clock-update)
|
||
(setq show-trailing-whitespace nil))
|
||
|
||
(defvar world-clock--timer nil
|
||
"The current world clock timer.")
|
||
|
||
(defun world-clock-display (alist)
|
||
"Replace current buffer text with times in various zones, based on ALIST."
|
||
(let ((inhibit-read-only t)
|
||
(buffer-undo-list t)
|
||
(now (current-time))
|
||
(max-width 0)
|
||
result fmt)
|
||
(erase-buffer)
|
||
(dolist (zone alist)
|
||
(let* ((label (cadr zone))
|
||
(width (string-width label)))
|
||
(push (cons label
|
||
(format-time-string world-clock-time-format
|
||
now (car zone)))
|
||
result)
|
||
(when (> width max-width)
|
||
(setq max-width width))))
|
||
(setq fmt (concat "%-" (int-to-string max-width) "s %s\n"))
|
||
(dolist (timedata (nreverse result))
|
||
(insert (format fmt
|
||
(propertize (car timedata)
|
||
'face 'world-clock-label)
|
||
(cdr timedata))))
|
||
(delete-char -1))
|
||
(goto-char (point-min)))
|
||
|
||
;;;###autoload
|
||
(define-obsolete-function-alias 'display-time-world
|
||
#'world-clock "28.1")
|
||
|
||
;;;###autoload
|
||
(defun world-clock ()
|
||
"Display a world clock buffer with times in various time zones.
|
||
The variable `world-clock-list' specifies which time zones to use.
|
||
To turn off the world time display, go to the window and type `\\[quit-window]'."
|
||
(interactive)
|
||
(if-let ((buffer (get-buffer world-clock-buffer-name)))
|
||
(pop-to-buffer buffer)
|
||
(pop-to-buffer world-clock-buffer-name)
|
||
(when world-clock-timer-enable
|
||
(setq world-clock--timer
|
||
(run-at-time t world-clock-timer-second #'world-clock-update))
|
||
(add-hook 'kill-buffer-hook #'world-clock-cancel-timer nil t)))
|
||
(world-clock-display (time--display-world-list))
|
||
(world-clock-mode)
|
||
(fit-window-to-buffer))
|
||
|
||
(defun world-clock-cancel-timer ()
|
||
"Cancel the world clock timer."
|
||
(when world-clock--timer
|
||
(cancel-timer world-clock--timer)
|
||
(setq world-clock--timer nil)))
|
||
|
||
(defun world-clock-update (&optional _arg _noconfirm)
|
||
"Update the `world-clock' buffer."
|
||
(if (get-buffer world-clock-buffer-name)
|
||
(with-current-buffer (get-buffer world-clock-buffer-name)
|
||
(let ((op (point)))
|
||
(world-clock-display (time--display-world-list))
|
||
(goto-char op)))
|
||
(world-clock-cancel-timer)))
|
||
|
||
;;;###autoload
|
||
(defun emacs-uptime (&optional format here)
|
||
"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\".
|
||
If the optional argument HERE is non-nil, insert string at
|
||
point."
|
||
(interactive "i\nP")
|
||
(let ((str
|
||
(format-seconds (or format "%Y, %D, %H, %M, %z%S")
|
||
(time-convert
|
||
(time-since before-init-time)
|
||
'integer))))
|
||
(if here
|
||
(insert str)
|
||
(if (called-interactively-p 'interactive)
|
||
(message "%s" str)
|
||
str))))
|
||
|
||
;;;###autoload
|
||
(defun emacs-init-time (&optional format)
|
||
"Return a string giving the duration of the Emacs initialization.
|
||
FORMAT is a string to format the result, using `format'. If nil,
|
||
the default format \"%f seconds\" is used."
|
||
(interactive)
|
||
(let ((str (format (or format "%f seconds")
|
||
(float-time (time-subtract after-init-time
|
||
before-init-time)))))
|
||
(if (called-interactively-p 'interactive)
|
||
(message "%s" str)
|
||
str)))
|
||
|
||
(provide 'time)
|
||
|
||
;;; time.el ends here
|