lisp/version.el

   1 ;;; version.el --- record version number of Emacs.
   2
   3 ;;; Copyright (C) 1985, 1992, 1994, 1995, 1999 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: internal
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Code:
  26
  27 (defconst emacs-version "21.0.90" "\
  28 Version numbers of this version of Emacs.")
  29
  30 (defconst emacs-major-version
  31   (progn (string-match "^[0-9]+" emacs-version)
  32          (string-to-int (match-string 0 emacs-version)))
  33   "Major version number of this version of Emacs.
  34 This variable first existed in version 19.23.")
  35
  36 (defconst emacs-minor-version
  37   (progn (string-match "^[0-9]+\\.\\([0-9]+\\)" emacs-version)
  38          (string-to-int (match-string 1 emacs-version)))
  39   "Minor version number of this version of Emacs.
  40 This variable first existed in version 19.23.")
  41
  42 (defconst emacs-build-time (current-time) "\
  43 Time at which Emacs was dumped out.")
  44
  45 (defconst emacs-build-system (system-name))
  46
  47 (defun emacs-version  (&optional here) "\
  48 Return string describing the version of Emacs that is running.
  49 If optional argument HERE is non-nil, insert string at point.
  50 Don't use this function in programs to choose actions according
  51 to the system configuration; look at `system-configuration' instead."
  52   (interactive "P")
  53   (let ((version-string
  54          (format (if (not (interactive-p))
  55                      "GNU Emacs %s (%s%s)\n of %s on %s"
  56                    "GNU Emacs %s (%s%s) of %s on %s")
  57                  emacs-version
  58                  system-configuration
  59                  (cond ((featurep 'motif) ", Motif")
  60                        ((featurep 'x-toolkit) ", X toolkit")
  61                        (t ""))
  62                  (format-time-string "%a %Y-%m-%d" emacs-build-time)
  63                  emacs-build-system)))
  64     (if here
  65         (insert version-string)
  66       (if (interactive-p)
  67           (message "%s" version-string)
  68         version-string))))
  69
  70 ;;; We hope that this alias is easier for people to find.
  71 (defalias 'version 'emacs-version)
  72
  73 ;;; We put version info into the executable in the form that ident(1) uses.
  74 (or (memq system-type '(vax-vms windows-nt))
  75     (purecopy (concat "\n$Id: " (subst-char-in-string ?\n ? (emacs-version))
  76                       " $\n")))
  77
  78 ;;Local variables:
  79 ;;version-control: never
  80 ;;End:
  81
  82 ;;; version.el ends here