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181 lines
7.5 KiB
EmacsLisp
181 lines
7.5 KiB
EmacsLisp
;;; version.el --- record version number of Emacs
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;; Copyright (C) 1985, 1992, 1994-1995, 1999-2013 Free Software
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;; Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: internal
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;; Package: emacs
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(defconst emacs-major-version
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(progn (string-match "^[0-9]+" emacs-version)
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(string-to-number (match-string 0 emacs-version)))
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"Major version number of this version of Emacs.
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This variable first existed in version 19.23.")
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(defconst emacs-minor-version
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(progn (string-match "^[0-9]+\\.\\([0-9]+\\)" emacs-version)
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(string-to-number (match-string 1 emacs-version)))
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"Minor version number of this version of Emacs.
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This variable first existed in version 19.23.")
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(defconst emacs-build-time (current-time)
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"Time at which Emacs was dumped out.")
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(defconst emacs-build-system (system-name)
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"Name of the system on which Emacs was built.")
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(defvar motif-version-string)
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(defvar gtk-version-string)
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(defvar ns-version-string)
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(defun emacs-version (&optional here)
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"Return string describing the version of Emacs that is running.
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If optional argument HERE is non-nil, insert string at point.
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Don't use this function in programs to choose actions according
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to the system configuration; look at `system-configuration' instead."
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(interactive "P")
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(let ((version-string
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(format (if (not (called-interactively-p 'interactive))
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"GNU Emacs %s (%s%s%s)\n of %s on %s"
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"GNU Emacs %s (%s%s%s) of %s on %s")
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emacs-version
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system-configuration
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(cond ((featurep 'motif)
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(concat ", " (substring motif-version-string 4)))
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((featurep 'gtk)
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(concat ", GTK+ Version " gtk-version-string))
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((featurep 'x-toolkit) ", X toolkit")
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((featurep 'ns)
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(format ", NS %s" ns-version-string))
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(t ""))
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(if (and (boundp 'x-toolkit-scroll-bars)
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(memq x-toolkit-scroll-bars '(xaw xaw3d)))
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(format ", %s scroll bars"
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(capitalize (symbol-name x-toolkit-scroll-bars)))
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"")
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(format-time-string "%Y-%m-%d" emacs-build-time)
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emacs-build-system)))
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(if here
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(insert version-string)
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(if (called-interactively-p 'interactive)
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(message "%s" version-string)
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version-string))))
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;; We hope that this alias is easier for people to find.
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(defalias 'version 'emacs-version)
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;; Set during dumping, this is a defvar so that it can be setq'd.
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(defvar emacs-bzr-version nil
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"String giving the bzr revision from which this Emacs was built.
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The format is: [revno] revision_id, where revno may be absent.
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Value is nil if Emacs was not built from a bzr checkout, or if we could
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not determine the revision.")
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(defun emacs-bzr-version-dirstate (dir)
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"Try to return as a string the bzr revision ID of directory DIR.
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This uses the dirstate file's parent revision entry.
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Returns nil if unable to find this information."
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(let ((file (expand-file-name ".bzr/checkout/dirstate" dir)))
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(when (file-readable-p file)
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(with-temp-buffer
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(insert-file-contents file)
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(and (looking-at "#bazaar dirstate flat format 3")
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(forward-line 3)
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(looking-at "[0-9]+\0\\([^\0\n]+\\)\0")
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(match-string 1))))))
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(defun emacs-bzr-version-bzr (_dir)
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"Ask bzr itself for the version information for directory DIR."
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;; Comments on `bzr version-info':
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;; i) Unknown files also cause clean != 1.
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;; ii) It can be slow, contacting the upstream repo to get the
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;; branch nick if one is not set locally, even with a custom
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;; template that is not asking for the nick (as used here). You'd
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;; think the latter part would be trivial to fix:
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;; https://bugs.launchpad.net/bzr/+bug/882541/comments/3
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;; https://bugs.launchpad.net/bzr/+bug/629150
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;; You can set the nick locally with `bzr nick ...', which speeds
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;; things up enormously. `bzr revno' does not have this issue, but
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;; has no way to print the revision_id AFAICS.
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(message "Waiting for bzr...")
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(with-temp-buffer
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(if (zerop
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(call-process "bzr" nil '(t nil) nil "version-info"
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"--custom"
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"--template={revno} {revision_id} (clean = {clean})"
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"dir"))
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(buffer-string))))
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(defun emacs-bzr-get-version (&optional dir external)
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"Try to return as a string the bzr revision of the Emacs sources.
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The format is: [revno] revision_id, where revno may be absent.
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Value is nil if the sources do not seem to be under bzr, or if we could
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not determine the revision. Note that this reports on the current state
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of the sources, which may not correspond to the running Emacs.
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Optional argument DIR is a directory to use instead of `source-directory'.
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Optional argument EXTERNAL non-nil means to maybe ask `bzr' itself,
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if the sources appear to be under bzr. If `force', always ask bzr.
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Otherwise only ask bzr if we cannot find any information ourselves."
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(or dir (setq dir source-directory))
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(when (file-directory-p (expand-file-name ".bzr/branch" dir))
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(if (eq external 'force)
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(emacs-bzr-version-bzr dir)
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(let (file loc rev)
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(cond ((file-readable-p
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(setq file (expand-file-name ".bzr/branch/last-revision" dir)))
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(with-temp-buffer
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(insert-file-contents file)
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(goto-char (point-max))
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(if (looking-back "\n")
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(delete-char -1))
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(buffer-string)))
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;; OK, no last-revision. Is it a lightweight checkout?
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((file-readable-p
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(setq file (expand-file-name ".bzr/branch/location" dir)))
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(setq rev (emacs-bzr-version-dirstate dir))
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;; If the parent branch is local, try looking there for the rev.
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;; Note: there is no guarantee that the parent branch's rev
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;; corresponds to this branch. This branch could have
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;; been made with a specific -r revno argument, or the
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;; parent could have been updated since this branch was created.
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;; To try and detect this, we check the dirstate revids
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;; to see if they match.
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(if (and (setq loc (with-temp-buffer
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(insert-file-contents file)
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(if (looking-at "file://\\(.*\\)")
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(match-string 1))))
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(equal rev (emacs-bzr-version-dirstate loc)))
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(emacs-bzr-get-version loc)
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;; If parent does not match, the best we can do without
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;; calling external commands is to use the dirstate rev.
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rev))
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(external
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(emacs-bzr-version-bzr dir)))))))
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;; We put version info into the executable in the form that `ident' uses.
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(purecopy (concat "\n$Id: " (subst-char-in-string ?\n ?\s (emacs-version))
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" $\n"))
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;;; version.el ends here
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