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- ;; Display time and load in mode line of Emacs.
- ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
- ;; This file is part of GNU Emacs.
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY. No author or distributor
- ;; accepts responsibility to anyone for the consequences of using it
- ;; or for whether it serves any particular purpose or works at all,
- ;; unless he says so in writing. Refer to the GNU Emacs General Public
- ;; License for full details.
- ;; Everyone is granted permission to copy, modify and redistribute
- ;; GNU Emacs, but only under the conditions described in the
- ;; GNU Emacs General Public License. A copy of this license is
- ;; supposed to have been given to you along with GNU Emacs so you
- ;; can know your rights and responsibilities. It should be in a
- ;; file named COPYING. Among other things, the copyright notice
- ;; and this notice must be preserved on all copies.
- (defvar display-time-process nil)
- (defvar display-time-interval 60
- "*Seconds between updates of time in the mode line.")
- (defvar display-time-string nil)
- (defun display-time ()
- "Display current time and load level in mode line of each buffer.
- Updates automatically every minute.
- If display-time-day-and-date is non-nil, the current day and date
- are displayed as well."
- (interactive)
- (let ((live (and display-time-process
- (eq (process-status display-time-process) 'run))))
- (if (not live)
- (save-excursion
- (if display-time-process
- (delete-process display-time-process))
- (or global-mode-string (setq global-mode-string '("")))
- (or (memq 'display-time-string global-mode-string)
- (setq global-mode-string
- (append global-mode-string '(display-time-string))))
- (setq display-time-string "time and load")
- (setq display-time-process
- (start-process "display-time" nil
- "loadst"
- "-n" (int-to-string display-time-interval)))
- (process-kill-without-query display-time-process)
- (set-process-sentinel display-time-process 'display-time-sentinel)
- (set-process-filter display-time-process 'display-time-filter)))))
- (defun display-time-sentinel (proc reason)
- (or (eq (process-status proc) 'run)
- (setq display-time-string ""))
- ;; Force mode-line updates
- (save-excursion (set-buffer (other-buffer)))
- (set-buffer-modified-p (buffer-modified-p))
- (sit-for 0))
- (defun display-time-filter (proc string)
- ;; Desired data can't need more than the last 30 chars,
- ;; so save time by flushing the rest.
- ;; This way, if we have many different times all collected at once,
- ;; we can discard all but the last few very fast.
- (if (> (length string) 30)
- (setq string (substring string -30)))
- ;; Now discard all but the very last one.
- (while (and (> (length string) 4)
- (string-match "[0-9]+:[0-9][0-9].." string 4))
- (setq string (substring string (match-beginning 0))))
- (if (string-match "[^0-9][0-9]+:" string)
- (setq string (substring string 0 (1+ (match-beginning 0)))))
- ;; Append the date if desired.
- (if display-time-day-and-date
- (setq string (concat (substring (current-time-string) 0 11) string)))
- ;; Install the new time for display.
- (setq display-time-string string)
- ;; Force redisplay of all buffers' mode lines to be considered.
- (save-excursion (set-buffer (other-buffer)))
- (set-buffer-modified-p (buffer-modified-p))
- ;; Do redisplay right now, if no input pending.
- (sit-for 0))
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