-;;; version.el --- record version number of Emacs -*- no-byte-compile: t -*-
+;;; version.el --- record version number of Emacs
-;; Copyright (C) 1985, 1992, 1994, 1995, 1999, 2000, 2001, 2002, 2003,
-;; 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
-;; Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1992, 1994-1995, 1999-2013 Free Software
+;; Foundation, Inc.
;; Maintainer: FSF
;; Keywords: internal
+;; Package: emacs
;; This file is part of GNU Emacs.
;;; Commentary:
-;; This file is loaded uncompiled when dumping Emacs.
-;; Doc-strings should adhere to the conventions of make-docfile.
-
;;; Code:
-(defconst emacs-copyright "Copyright (C) 2011 Free Software Foundation, Inc." "\
-Short copyright string for this version of Emacs.")
-
-(defconst emacs-version "23.3.50" "\
-Version numbers of this version of Emacs.")
-
-(defconst emacs-major-version (progn (string-match "^[0-9]+" emacs-version) (string-to-number (match-string 0 emacs-version))) "\
-Major version number of this version of Emacs.
+(defconst emacs-major-version
+ (progn (string-match "^[0-9]+" emacs-version)
+ (string-to-number (match-string 0 emacs-version)))
+ "Major version number of this version of Emacs.
This variable first existed in version 19.23.")
-(defconst emacs-minor-version (progn (string-match "^[0-9]+\\.\\([0-9]+\\)" emacs-version) (string-to-number (match-string 1 emacs-version))) "\
-Minor version number of this version of Emacs.
+(defconst emacs-minor-version
+ (progn (string-match "^[0-9]+\\.\\([0-9]+\\)" emacs-version)
+ (string-to-number (match-string 1 emacs-version)))
+ "Minor version number of this version of Emacs.
This variable first existed in version 19.23.")
-(defconst emacs-build-time (current-time) "\
-Time at which Emacs was dumped out.")
+(defconst emacs-build-time (current-time)
+ "Time at which Emacs was dumped out.")
-(defconst emacs-build-system (system-name))
+(defconst emacs-build-system (system-name)
+ "Name of the system on which Emacs was built.")
-(defun emacs-version (&optional here) "\
-Return string describing the version of Emacs that is running.
+(defvar motif-version-string)
+(defvar gtk-version-string)
+(defvar ns-version-string)
+
+(defun emacs-version (&optional here)
+ "Return string describing the version of Emacs that is running.
If optional argument HERE is non-nil, insert string at point.
Don't use this function in programs to choose actions according
to the system configuration; look at `system-configuration' instead."
;; We hope that this alias is easier for people to find.
(defalias 'version 'emacs-version)
-;; We put version info into the executable in the form that `ident' uses.
-(or (eq system-type 'windows-nt)
- (purecopy (concat "\n$Id: " (subst-char-in-string ?\n ?\s (emacs-version))
- " $\n")))
+;; Set during dumping, this is a defvar so that it can be setq'd.
+(defvar emacs-bzr-version nil
+ "String giving the bzr revision from which this Emacs was built.
+The format is: [revno] revision_id, where revno may be absent.
+Value is nil if Emacs was not built from a bzr checkout, or if we could
+not determine the revision.")
+
+(defun emacs-bzr-version-dirstate (dir)
+ "Try to return as a string the bzr revision ID of directory DIR.
+This uses the dirstate file's parent revision entry.
+Returns nil if unable to find this information."
+ (let ((file (expand-file-name ".bzr/checkout/dirstate" dir)))
+ (when (file-readable-p file)
+ (with-temp-buffer
+ (insert-file-contents file)
+ (and (looking-at "#bazaar dirstate flat format 3")
+ (forward-line 3)
+ (looking-at "[0-9]+\0\\([^\0\n]+\\)\0")
+ (match-string 1))))))
+
+(defun emacs-bzr-version-bzr (dir)
+ "Ask bzr itself for the version information for directory DIR."
+ ;; Comments on `bzr version-info':
+ ;; i) Unknown files also cause clean != 1.
+ ;; ii) It can be slow, contacting the upstream repo to get the
+ ;; branch nick if one is not set locally, even with a custom
+ ;; template that is not asking for the nick (as used here). You'd
+ ;; think the latter part would be trivial to fix:
+ ;; https://bugs.launchpad.net/bzr/+bug/882541/comments/3
+ ;; https://bugs.launchpad.net/bzr/+bug/629150
+ ;; You can set the nick locally with `bzr nick ...', which speeds
+ ;; things up enormously. `bzr revno' does not have this issue, but
+ ;; has no way to print the revision_id AFAICS.
+ (message "Waiting for bzr...")
+ (with-temp-buffer
+ (if (zerop
+ (call-process "bzr" nil '(t nil) nil "version-info"
+ "--custom"
+ "--template={revno} {revision_id} (clean = {clean})"
+ "dir"))
+ (buffer-string))))
+
+(defun emacs-bzr-get-version (&optional dir external)
+ "Try to return as a string the bzr revision of the Emacs sources.
+The format is: [revno] revision_id, where revno may be absent.
+Value is nil if the sources do not seem to be under bzr, or if we could
+not determine the revision. Note that this reports on the current state
+of the sources, which may not correspond to the running Emacs.
+
+Optional argument DIR is a directory to use instead of `source-directory'.
+Optional argument EXTERNAL non-nil means to maybe ask `bzr' itself,
+if the sources appear to be under bzr. If `force', always ask bzr.
+Otherwise only ask bzr if we cannot find any information ourselves."
+ (or dir (setq dir source-directory))
+ (when (file-directory-p (expand-file-name ".bzr/branch" dir))
+ (if (eq external 'force)
+ (emacs-bzr-version-bzr dir)
+ (let (file loc rev)
+ (cond ((file-readable-p
+ (setq file (expand-file-name ".bzr/branch/last-revision" dir)))
+ (with-temp-buffer
+ (insert-file-contents file)
+ (goto-char (point-max))
+ (if (looking-back "\n")
+ (delete-char -1))
+ (buffer-string)))
+ ;; OK, no last-revision. Is it a lightweight checkout?
+ ((file-readable-p
+ (setq file (expand-file-name ".bzr/branch/location" dir)))
+ (setq rev (emacs-bzr-version-dirstate dir))
+ ;; If the parent branch is local, try looking there for the rev.
+ ;; Note: there is no guarantee that the parent branch's rev
+ ;; corresponds to this branch. This branch could have
+ ;; been made with a specific -r revno argument, or the
+ ;; parent could have been updated since this branch was created.
+ ;; To try and detect this, we check the dirstate revids
+ ;; to see if they match.
+ (if (and (setq loc (with-temp-buffer
+ (insert-file-contents file)
+ (if (looking-at "file://\\(.*\\)")
+ (match-string 1))))
+ (equal rev (emacs-bzr-version-dirstate loc)))
+ (emacs-bzr-get-version loc)
+ ;; If parent does not match, the best we can do without
+ ;; calling external commands is to use the dirstate rev.
+ rev))
+ (external
+ (emacs-bzr-version-bzr dir)))))))
-;;Local variables:
-;;version-control: never
-;;End:
+;; We put version info into the executable in the form that `ident' uses.
+(purecopy (concat "\n$Id: " (subst-char-in-string ?\n ?\s (emacs-version))
+ " $\n"))
;;; version.el ends here