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e5ee7105 C |
1 | ;; Display time and load in mode line of Emacs. |
2 | ;; Copyright (C) 1985, 1986, 1987, 1990 Free Software Foundation, Inc. | |
3 | ||
4 | ;; This file is part of GNU Emacs. | |
5 | ||
6 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
7 | ;; it under the terms of the GNU General Public License as published by | |
8 | ;; the Free Software Foundation; either version 1, or (at your option) | |
9 | ;; any later version. | |
10 | ||
11 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
12 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;; GNU General Public License for more details. | |
15 | ||
16 | ;; You should have received a copy of the GNU General Public License | |
17 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
18 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | ||
20 | ||
21 | (defvar display-time-mail-file nil | |
22 | "*File name of mail inbox file, for indicating existence of new mail. | |
23 | Default is system-dependent, and is the same as used by Rmail.") | |
24 | ||
25 | (defvar display-time-process nil) | |
26 | ||
27 | (defvar display-time-interval 60 | |
28 | "*Seconds between updates of time in the mode line.") | |
29 | ||
30 | (defvar display-time-string nil) | |
31 | ||
32 | (defun display-time () | |
33 | "Display current time and load level in mode line of each buffer. | |
34 | Updates automatically every minute. | |
35 | If display-time-day-and-date is non-nil, the current day and date | |
36 | are displayed as well." | |
37 | (interactive) | |
38 | (let ((live (and display-time-process | |
39 | (eq (process-status display-time-process) 'run)))) | |
40 | (if (not live) | |
41 | (progn | |
42 | (if display-time-process | |
43 | (delete-process display-time-process)) | |
44 | (or global-mode-string (setq global-mode-string '(""))) | |
45 | (or (memq 'display-time-string global-mode-string) | |
46 | (setq global-mode-string | |
47 | (append global-mode-string '(display-time-string)))) | |
48 | (setq display-time-string "") | |
49 | (setq display-time-process | |
50 | (start-process "display-time" nil | |
51 | (concat exec-directory "wakeup") | |
52 | (int-to-string display-time-interval))) | |
53 | (process-kill-without-query display-time-process) | |
54 | (set-process-sentinel display-time-process 'display-time-sentinel) | |
55 | (set-process-filter display-time-process 'display-time-filter))))) | |
56 | ||
57 | (defun display-time-sentinel (proc reason) | |
58 | (or (eq (process-status proc) 'run) | |
59 | (setq display-time-string "")) | |
60 | ;; Force mode-line updates | |
61 | (save-excursion (set-buffer (other-buffer))) | |
62 | (set-buffer-modified-p (buffer-modified-p)) | |
63 | (sit-for 0)) | |
64 | ||
65 | (defun display-time-filter (proc string) | |
66 | (let ((time (current-time-string)) | |
67 | (load (condition-case () | |
68 | (if (zerop (car (load-average))) "" | |
69 | (format "%03d" (car (load-average)))) | |
70 | (error ""))) | |
71 | (mail-spool-file (or display-time-mail-file | |
72 | (getenv "MAIL") | |
73 | (concat rmail-spool-directory | |
74 | (or (getenv "LOGNAME") | |
75 | (getenv "USER") | |
76 | (user-login-name))))) | |
77 | hour pm) | |
78 | (setq hour (read (substring time 11 13))) | |
79 | (setq pm (>= hour 12)) | |
80 | (if (> hour 12) | |
81 | (setq hour (- hour 12)) | |
82 | (if (= hour 0) | |
83 | (setq hour 12))) | |
84 | (setq display-time-string | |
85 | (concat (format "%d" hour) (substring time 13 16) | |
86 | (if pm "pm " "am ") | |
87 | (if (string= load "") | |
88 | "" | |
89 | (concat (substring load 0 -2) "." (substring load -2))) | |
90 | (if (and (file-exists-p mail-spool-file) | |
91 | ;; file not empty? | |
92 | (> (nth 7 (file-attributes mail-spool-file)) 0)) | |
93 | " Mail" | |
94 | ""))) | |
95 | ;; Append the date if desired. | |
96 | (if display-time-day-and-date | |
97 | (setq display-time-string | |
98 | (concat (substring time 0 11) display-time-string)))) | |
99 | ;; Force redisplay of all buffers' mode lines to be considered. | |
100 | (save-excursion (set-buffer (other-buffer))) | |
101 | (set-buffer-modified-p (buffer-modified-p)) | |
102 | ;; Do redisplay right now, if no input pending. | |
103 | (sit-for 0)) |