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1 ;;; time.el --- display time and load in mode line of Emacs.
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3 ;; Copyright (C) 1985, 86, 87, 93, 94, 1996 Free Software Foundation, Inc.
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5 ;; Maintainer: FSF
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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22 ;; 02111-1307, USA.
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23
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24 ;;; Synched up with: Not synched with FSF.
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25
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26 ;;; Commentary:
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27
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28 ;; Facilities to display current time/date and a new-mail indicator
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29 ;; in the Emacs mode line. The single entry point is `display-time'.
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30
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31 ;; See also reportmail.el.
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32 ;; This uses the XEmacs timeout-event mechanism, via a version
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33 ;; of Kyle Jones' itimer package.
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34
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35 ;;; Code:
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36
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37 (require 'itimer)
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38
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39 (defvar display-time-mail-file nil
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40 "*File name of mail inbox file, for indicating existence of new mail.
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41 Non-nil and not a string means don't check for mail. nil means use
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42 default, which is system-dependent, and is the same as used by Rmail.")
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43
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44 ;;;###autoload
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45 (defvar display-time-day-and-date nil "\
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46 *Non-nil means \\[display-time] should display day and date as well as time.")
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47
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48 (defvar display-time-interval 60
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49 "*Seconds between updates of time in the mode line.")
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50
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51 (defvar display-time-24hr-format nil
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52 "*Non-nil indicates time should be displayed as hh:mm, 0 <= hh <= 23.
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53 Nil means 1 <= hh <= 12, and an AM/PM suffix is used.")
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54
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55 (defvar display-time-echo-area nil
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56 "*If non-nil, display-time will use the echo area instead of the mode line.")
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57
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58 (defvar display-time-string nil)
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59
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60 (defvar display-time-hook nil
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61 "*List of functions to be called when the time is updated on the mode line.")
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62
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63 (defvar display-time-server-down-time nil
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64 "Time when mail file's file system was recorded to be down.
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65 If that file system seems to be up, the value is nil.")
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66
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67 ;;;###autoload
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68 (defun display-time ()
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69 "Display current time, load level, and mail flag in mode line of each buffer.
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70 Updates automatically every minute.
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71 If `display-time-day-and-date' is non-nil, the current day and date
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72 are displayed as well.
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73 After each update, `display-time-hook' is run with `run-hooks'.
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74 If `display-time-echo-area' is non-nil, the time is displayed in the
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75 echo area instead of in the mode-line."
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76 (interactive)
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77 ;; if the "display-time" itimer already exists, nuke it first.
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78 (let ((old (get-itimer "display-time")))
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79 (if old (delete-itimer old)))
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80 ;; If we're not displaying the time in the echo area
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81 ;; and the global mode string does not have a non-nil value
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82 ;; then initialize the global mode string's value.
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83 (or display-time-echo-area
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84 global-mode-string
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85 (setq global-mode-string '("")))
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86 ;; If we're not displaying the time in the echo area
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87 ;; and our display variable is not part of the global-mode-string list
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88 ;; the we add our variable to the list. This will make the time
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89 ;; appear on the modeline.
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90 (or display-time-echo-area
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91 (memq 'display-time-string global-mode-string)
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92 (setq global-mode-string
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93 (append global-mode-string '(display-time-string))))
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94 ;; Display the time initially...
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95 (display-time-function)
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96 ;; ... and start an itimer to do it automatically thereafter.
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97 ;;
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98 ;; If we wanted to be really clever about this, we could have the itimer
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99 ;; not be automatically restarted, but have it re-add itself each time.
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100 ;; Then we could look at (current-time) and arrange for the itimer to
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101 ;; wake up exactly at the minute boundary. But that's just a little
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102 ;; more work than it's worth...
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103 (start-itimer "display-time" 'display-time-function
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104 display-time-interval display-time-interval))
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105
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106 (defvar display-time-string-forms
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107 '((if display-time-day-and-date
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108 (format "%s %s %s " dayname monthname day)
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109 "")
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110 (format "%s:%s%s"
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111 (if display-time-24hr-format 24-hours 12-hours)
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112 minutes
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113 (if display-time-24hr-format "" am-pm))
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114 load
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115 (if mail " Mail" ""))
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116 "*A list of expressions governing display of the time in the mode line.
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117 This expression is a list of expressions that can involve the keywords
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118 `load', `day', `month', and `year', `12-hours', `24-hours', `minutes',
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119 `seconds', all numbers in string form, and `monthname', `dayname', `am-pm',
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120 and `time-zone' all alphabetic strings, and `mail' a true/nil value.
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121
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122 For example, the form
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123
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124 '((substring year -2) \"/\" month \"/\" day
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125 \" \" 24-hours \":\" minutes \":\" seconds
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126 (if time-zone \" (\") time-zone (if time-zone \")\")
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127 (if mail \" Mail\" \"\"))
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128
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129 would give mode line times like `94/12/30 21:07:48 (UTC)'.")
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130
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131 (defun display-time-function ()
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132 (let* ((now (current-time))
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133 (time (current-time-string now))
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134 (load (condition-case ()
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135 (if (zerop (car (load-average))) ""
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136 (let ((str (format " %03d" (car (load-average)))))
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137 (concat (substring str 0 -2) "." (substring str -2))))
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138 (error "")))
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139 (mail-spool-file (or display-time-mail-file
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140 (getenv "MAIL")
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141 (concat rmail-spool-directory
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142 (user-login-name))))
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143 (mail (and (stringp mail-spool-file)
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144 (or (null display-time-server-down-time)
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145 ;; If have been down for 20 min, try again.
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146 (> (- (nth 1 (current-time))
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147 display-time-server-down-time)
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148 1200))
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149 (let ((start-time (current-time)))
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150 (prog1
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151 (display-time-file-nonempty-p mail-spool-file)
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152 (if (> (- (nth 1 (current-time)) (nth 1 start-time))
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153 20)
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154 ;; Record that mail file is not accessible.
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155 (setq display-time-server-down-time
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156 (nth 1 (current-time)))
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157 ;; Record that mail file is accessible.
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158 (setq display-time-server-down-time nil))))))
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159 (24-hours (substring time 11 13))
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160 (hour (string-to-int 24-hours))
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161 (12-hours (int-to-string (1+ (% (+ hour 11) 12))))
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162 (am-pm (if (>= hour 12) "pm" "am"))
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163 (minutes (substring time 14 16))
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164 (seconds (substring time 17 19))
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165 (time-zone (car (cdr (current-time-zone now))))
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166 (day (substring time 8 10))
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167 (year (substring time 20 24))
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168 (monthname (substring time 4 7))
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169 (month
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170 (cdr
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171 (assoc
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172 monthname
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173 '(("Jan" . "1") ("Feb" . "2") ("Mar" . "3") ("Apr" . "4")
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174 ("May" . "5") ("Jun" . "6") ("Jul" . "7") ("Aug" . "8")
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175 ("Sep" . "9") ("Oct" . "10") ("Nov" . "11") ("Dec" . "12")))))
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176 (dayname (substring time 0 3)))
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177 (setq display-time-string
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178 (mapconcat 'eval display-time-string-forms ""))
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179 ;; This is inside the let binding, but we are not going to document
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180 ;; what variables are available.
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181 (run-hooks 'display-time-hook))
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182 (if display-time-echo-area
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183 (or (> (minibuffer-depth) 0)
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184 ;; don't stomp echo-area-buffer if reading from minibuffer now.
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185 (save-excursion
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186 (save-window-excursion
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187 (select-window (minibuffer-window))
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188 (erase-buffer)
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189 (indent-to (- (screen-width) (length display-time-string) 1))
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190 (insert display-time-string)
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191 (message (buffer-string)))))
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192 (force-mode-line-update)
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193 ;; Do redisplay right now, if no input pending.
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194 (sit-for 0)))
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195
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196 (defun display-time-file-nonempty-p (file)
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197 (and (file-exists-p file)
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198 (< 0 (nth 7 (file-attributes (file-chase-links file))))))
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199
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200 (provide 'time)
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201
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202 ;;; time.el ends here
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