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Annotation of 43BSD/contrib/emacs/lisp/time.el, revision 1.1

1.1     ! root        1: ;; Display time and load in mode line of Emacs.
        !             2: ;; Copyright (C) 1985 Richard M. Stallman.
        !             3: 
        !             4: ;; This file is part of GNU Emacs.
        !             5: 
        !             6: ;; GNU Emacs is distributed in the hope that it will be useful,
        !             7: ;; but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: ;; accepts responsibility to anyone for the consequences of using it
        !             9: ;; or for whether it serves any particular purpose or works at all,
        !            10: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
        !            11: ;; License for full details.
        !            12: 
        !            13: ;; Everyone is granted permission to copy, modify and redistribute
        !            14: ;; GNU Emacs, but only under the conditions described in the
        !            15: ;; GNU Emacs General Public License.   A copy of this license is
        !            16: ;; supposed to have been given to you along with GNU Emacs so you
        !            17: ;; can know your rights and responsibilities.  It should be in a
        !            18: ;; file named COPYING.  Among other things, the copyright notice
        !            19: ;; and this notice must be preserved on all copies.
        !            20: 
        !            21: 
        !            22: (defvar display-time-process nil)
        !            23: 
        !            24: (defun display-time ()
        !            25:   "Display current time and load level in mode line of each buffer.
        !            26: Updates automatically every minute."
        !            27:   (interactive)
        !            28:   (let ((live (and display-time-process
        !            29:                   (eq (process-status display-time-process) 'run))))
        !            30:     (if (not live)
        !            31:        (save-excursion
        !            32:          (if display-time-process
        !            33:              (delete-process display-time-process))
        !            34:          (setq global-mode-string "time and load")
        !            35:          (setq display-time-process
        !            36:                (start-process "display-time" nil
        !            37:                               (expand-file-name "loadst" exec-directory)
        !            38:                               "-n" "60"))
        !            39:          (process-kill-without-query display-time-process)
        !            40:          (set-process-sentinel display-time-process 'display-time-sentinel)
        !            41:          (set-process-filter display-time-process 'display-time-filter)))))
        !            42: 
        !            43: (defun display-time-sentinel (proc reason)
        !            44:   (or (eq (process-status proc) 'run)
        !            45:       (setq global-mode-string ""))
        !            46:   ;; Force mode-line updates
        !            47:   (save-excursion (set-buffer (other-buffer)))
        !            48:   (set-buffer-modified-p (buffer-modified-p))
        !            49:   (sit-for 0))
        !            50: 
        !            51: (defun display-time-filter (proc string)
        !            52:   ;; Desired data can't need more than the last 30 chars,
        !            53:   ;; so save time by flushing the rest.
        !            54:   ;; This way, if we have many different times all collected at once,
        !            55:   ;; we can discard all but the last few very fast.
        !            56:   (if (> (length string) 30)
        !            57:       (setq string (substring string -30)))
        !            58:   ;; Now discard all but the very last one.
        !            59:   (while (string-match "[0-9]+:" string 4)
        !            60:     (setq string (substring string (match-beginning 0))))
        !            61:   ;; Append the date if desired.
        !            62:   (if display-time-day-and-date
        !            63:       (setq string (concat (substring (current-time-string) 0 11) string)))
        !            64:   ;; Install the new time for display.
        !            65:   (setq global-mode-string string)
        !            66:   ;; Force redisplay of all buffers' mode lines to be considered.
        !            67:   (save-excursion (set-buffer (other-buffer)))
        !            68:   (set-buffer-modified-p (buffer-modified-p))
        !            69:   ;; Do redisplay right now, if no input pending.
        !            70:   (sit-for 0))

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