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421 lines
15 KiB
EmacsLisp
421 lines
15 KiB
EmacsLisp
;;; vc-sccs.el --- support for SCCS version-control
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;; Copyright (C) 1992,93,94,95,96,97,98,99,2000,2001 Free Software Foundation, Inc.
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;; Author: FSF (see vc.el for full credits)
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;; Maintainer: Andre Spiegel <spiegel@gnu.org>
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;; $Id: vc-sccs.el,v 1.14 2002/02/25 22:05:16 spiegel Exp $
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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(eval-when-compile
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(require 'vc))
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;;;
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;;; Customization options
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;;;
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(defcustom vc-sccs-register-switches nil
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"*Extra switches for registering a file in SCCS.
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A string or list of strings passed to the checkin program by
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\\[vc-sccs-register]."
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:type '(choice (const :tag "None" nil)
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(string :tag "Argument String")
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(repeat :tag "Argument List"
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:value ("")
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string))
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:version "21.1"
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:group 'vc)
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(defcustom vc-sccs-diff-switches nil
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"*A string or list of strings specifying extra switches for `vcdiff',
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the diff utility used for SCCS under VC."
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:type '(choice (const :tag "None" nil)
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(string :tag "Argument String")
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(repeat :tag "Argument List"
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:value ("")
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string))
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:version "21.1"
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:group 'vc)
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(defcustom vc-sccs-header (or (cdr (assoc 'SCCS vc-header-alist)) '("%W%"))
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"*Header keywords to be inserted by `vc-insert-headers'."
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:type '(repeat string)
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:group 'vc)
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;;;###autoload
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(defcustom vc-sccs-master-templates
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'("%sSCCS/s.%s" "%ss.%s" vc-sccs-search-project-dir)
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"*Where to look for SCCS master files.
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For a description of possible values, see `vc-check-master-templates'."
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:type '(choice (const :tag "Use standard SCCS file names"
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("%sSCCS/s.%s" "%ss.%s" vc-sccs-search-project-dir))
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(repeat :tag "User-specified"
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(choice string
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function)))
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:version "21.1"
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:group 'vc)
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;;;
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;;; Internal variables
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;;;
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(defconst vc-sccs-name-assoc-file "VC-names")
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;;;
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;;; State-querying functions
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;;;
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;;;###autoload
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(progn (defun vc-sccs-registered (f) (vc-default-registered 'SCCS f)))
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(defun vc-sccs-state (file)
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"SCCS-specific function to compute the version control state."
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(with-temp-buffer
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(if (vc-insert-file (vc-sccs-lock-file file))
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(let* ((locks (vc-sccs-parse-locks))
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(workfile-version (vc-workfile-version file))
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(locking-user (cdr (assoc workfile-version locks))))
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(if (not locking-user)
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(if (vc-workfile-unchanged-p file)
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'up-to-date
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'unlocked-changes)
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(if (string= locking-user (vc-user-login-name))
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'edited
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locking-user)))
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'up-to-date)))
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(defun vc-sccs-state-heuristic (file)
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"SCCS-specific state heuristic."
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(if (not (vc-mistrust-permissions file))
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;; This implementation assumes that any file which is under version
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;; control and has -rw-r--r-- is locked by its owner. This is true
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;; for both RCS and SCCS, which keep unlocked files at -r--r--r--.
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;; We have to be careful not to exclude files with execute bits on;
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;; scripts can be under version control too. Also, we must ignore the
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;; group-read and other-read bits, since paranoid users turn them off.
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(let* ((attributes (file-attributes file))
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(owner-uid (nth 2 attributes))
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(permissions (nth 8 attributes)))
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(if (string-match ".r-..-..-." permissions)
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'up-to-date
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(if (string-match ".rw..-..-." permissions)
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(if (file-ownership-preserved-p file)
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'edited
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(vc-user-login-name owner-uid))
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;; Strange permissions.
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;; Fall through to real state computation.
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(vc-sccs-state file)))
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(vc-sccs-state file))))
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(defun vc-sccs-workfile-version (file)
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"SCCS-specific version of `vc-workfile-version'."
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(with-temp-buffer
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(vc-insert-file (vc-name file) "^\001e")
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(vc-parse-buffer "^\001d D \\([^ ]+\\)" 1)))
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(defun vc-sccs-checkout-model (file)
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"SCCS-specific version of `vc-checkout-model'."
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'locking)
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(defun vc-sccs-workfile-unchanged-p (file)
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"SCCS-specific implementation of vc-workfile-unchanged-p."
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(zerop (apply 'vc-do-command nil 1 "vcdiff" (vc-name file)
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(list "--brief" "-q"
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(concat "-r" (vc-workfile-version file))))))
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;;;
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;;; State-changing functions
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;;;
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(defun vc-sccs-register (file &optional rev comment)
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"Register FILE into the SCCS version-control system.
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REV is the optional revision number for the file. COMMENT can be used
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to provide an initial description of FILE.
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`vc-register-switches' and `vc-sccs-register-switches' are passed to
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the SCCS command (in that order).
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Automatically retrieve a read-only version of the file with keywords
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expanded if `vc-keep-workfiles' is non-nil, otherwise, delete the workfile."
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(let* ((switches (append
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(if (stringp vc-register-switches)
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(list vc-register-switches)
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vc-register-switches)
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(if (stringp vc-sccs-register-switches)
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(list vc-sccs-register-switches)
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vc-sccs-register-switches)))
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(dirname (or (file-name-directory file) ""))
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(basename (file-name-nondirectory file))
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(project-file (vc-sccs-search-project-dir dirname basename)))
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(let ((vc-name
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(or project-file
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(format (car vc-sccs-master-templates) dirname basename)))|)
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(apply 'vc-do-command nil 0 "admin" vc-name
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(and rev (concat "-r" rev))
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"-fb"
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(concat "-i" (file-relative-name file))
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(and comment (concat "-y" comment))
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switches))
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(delete-file file)
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(if vc-keep-workfiles
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(vc-do-command nil 0 "get" (vc-name file)))))
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(defun vc-sccs-responsible-p (file)
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"Return non-nil if SCCS thinks it would be responsible for registering FILE."
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;; TODO: check for all the patterns in vc-sccs-master-templates
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(or (file-directory-p (expand-file-name "SCCS" (file-name-directory file)))
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(stringp (vc-sccs-search-project-dir (or (file-name-directory file) "")
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(file-name-nondirectory file)))))
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(defun vc-sccs-checkin (file rev comment)
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"SCCS-specific version of `vc-backend-checkin'."
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(let ((switches (if (stringp vc-checkin-switches)
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(list vc-checkin-switches)
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vc-checkin-switches)))
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(apply 'vc-do-command nil 0 "delta" (vc-name file)
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(if rev (concat "-r" rev))
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(concat "-y" comment)
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switches)
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(if vc-keep-workfiles
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(vc-do-command nil 0 "get" (vc-name file)))))
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(defun vc-sccs-checkout (file &optional editable rev workfile)
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"Retrieve a copy of a saved version of SCCS controlled FILE into a WORKFILE.
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EDITABLE non-nil means that the file should be writable and
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locked. REV is the revision to check out into WORKFILE."
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(let ((filename (or workfile file))
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(file-buffer (get-file-buffer file))
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switches)
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(message "Checking out %s..." filename)
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(save-excursion
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;; Change buffers to get local value of vc-checkout-switches.
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(if file-buffer (set-buffer file-buffer))
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(setq switches (if (stringp vc-checkout-switches)
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(list vc-checkout-switches)
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vc-checkout-switches))
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;; Save this buffer's default-directory
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;; and use save-excursion to make sure it is restored
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;; in the same buffer it was saved in.
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(let ((default-directory default-directory))
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(save-excursion
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;; Adjust the default-directory so that the check-out creates
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;; the file in the right place.
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(setq default-directory (file-name-directory filename))
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(and rev (string= rev "") (setq rev nil))
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(if workfile
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;; Some SCCS implementations allow checking out directly to a
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;; file using the -G option, but then some don't so use the
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;; least common denominator approach and use the -p option
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;; ala RCS.
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(let ((vc-modes (logior (file-modes (vc-name file))
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(if editable 128 0)))
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(failed t))
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(unwind-protect
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(progn
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(let ((coding-system-for-read 'no-conversion)
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(coding-system-for-write 'no-conversion))
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(with-temp-file filename
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(apply 'vc-do-command
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(current-buffer) 0 "get" (vc-name file)
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"-s" ;; suppress diagnostic output
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(if editable "-e")
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"-p"
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(and rev
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(concat "-r"
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(vc-sccs-lookup-triple file rev)))
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switches)))
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(set-file-modes filename
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(logior (file-modes (vc-name file))
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(if editable 128 0)))
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(setq failed nil))
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(and failed (file-exists-p filename)
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(delete-file filename))))
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(apply 'vc-do-command nil 0 "get" (vc-name file)
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(if editable "-e")
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(and rev (concat "-r" (vc-sccs-lookup-triple file rev)))
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switches)))))
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(message "Checking out %s...done" filename)))
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(defun vc-sccs-revert (file &optional contents-done)
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"Revert FILE to the version it was based on."
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(vc-do-command nil 0 "unget" (vc-name file))
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(vc-do-command nil 0 "get" (vc-name file))
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;; Checking out explicit versions is not supported under SCCS, yet.
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;; We always "revert" to the latest version; therefore
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;; vc-workfile-version is cleared here so that it gets recomputed.
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(vc-file-setprop file 'vc-workfile-version nil))
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(defun vc-sccs-cancel-version (file editable)
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"Undo the most recent checkin of FILE.
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EDITABLE non-nil means previous version should be locked."
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(vc-do-command nil 0 "rmdel"
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(vc-name file)
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(concat "-r" (vc-workfile-version file)))
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(vc-do-command nil 0 "get"
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(vc-name file)
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(if editable "-e")))
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(defun vc-sccs-steal-lock (file &optional rev)
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"Steal the lock on the current workfile for FILE and revision REV."
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(vc-do-command nil 0 "unget" (vc-name file) "-n" (if rev (concat "-r" rev)))
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(vc-do-command nil 0 "get" (vc-name file) "-g" (if rev (concat "-r" rev))))
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;;;
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;;; History functions
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;;;
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(defun vc-sccs-print-log (file)
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"Get change log associated with FILE."
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(vc-do-command nil 0 "prs" (vc-name file)))
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(defun vc-sccs-logentry-check ()
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"Check that the log entry in the current buffer is acceptable for SCCS."
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(when (>= (buffer-size) 512)
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(goto-char 512)
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(error "Log must be less than 512 characters; point is now at pos 512")))
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(defun vc-sccs-diff (file &optional oldvers newvers)
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"Get a difference report using SCCS between two versions of FILE."
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(setq oldvers (vc-sccs-lookup-triple file oldvers))
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(setq newvers (vc-sccs-lookup-triple file newvers))
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(apply 'vc-do-command "*vc-diff*" 1 "vcdiff" (vc-name file)
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(append (list "-q"
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(and oldvers (concat "-r" oldvers))
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(and newvers (concat "-r" newvers)))
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(vc-diff-switches-list 'SCCS))))
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;;;
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;;; Snapshot system
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;;;
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(defun vc-sccs-assign-name (file name)
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"Assign to FILE's latest version a given NAME."
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(vc-sccs-add-triple name file (vc-workfile-version file)))
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;;;
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;;; Miscellaneous
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;;;
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(defun vc-sccs-check-headers ()
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"Check if the current file has any headers in it."
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(save-excursion
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(goto-char (point-min))
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(re-search-forward "%[A-Z]%" nil t)))
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(defun vc-sccs-rename-file (old new)
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;; Move the master file (using vc-rcs-master-templates).
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(vc-rename-master (vc-name old) new vc-sccs-master-templates)
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;; Update the snapshot file.
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(with-current-buffer
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(find-file-noselect
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(expand-file-name vc-sccs-name-assoc-file
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(file-name-directory (vc-name old))))
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(goto-char (point-min))
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;; (replace-regexp (concat ":" (regexp-quote old) "$") (concat ":" new))
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(while (re-search-forward (concat ":" (regexp-quote old) "$") nil t)
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(replace-match (concat ":" new) nil nil))
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(basic-save-buffer)
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(kill-buffer (current-buffer))))
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;;;
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;;; Internal functions
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;;;
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;; This function is wrapped with `progn' so that the autoload cookie
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;; copies the whole function itself into loaddefs.el rather than just placing
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;; a (autoload 'vc-sccs-search-project-dir "vc-sccs") which would not
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;; help us avoid loading vc-sccs.
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;;;###autoload
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(progn (defun vc-sccs-search-project-dir (dirname basename)
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"Return the name of a master file in the SCCS project directory.
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Does not check whether the file exists but returns nil if it does not
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find any project directory."
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(let ((project-dir (getenv "PROJECTDIR")) dirs dir)
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(when project-dir
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(if (file-name-absolute-p project-dir)
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(setq dirs '("SCCS" ""))
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(setq dirs '("src/SCCS" "src" "source/SCCS" "source"))
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(setq project-dir (expand-file-name (concat "~" project-dir))))
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(while (and (not dir) dirs)
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(setq dir (expand-file-name (car dirs) project-dir))
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(unless (file-directory-p dir)
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(setq dir nil)
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(setq dirs (cdr dirs))))
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(and dir (expand-file-name (concat "s." basename) dir))))))
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(defun vc-sccs-lock-file (file)
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"Generate lock file name corresponding to FILE."
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(let ((master (vc-name file)))
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(and
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master
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(string-match "\\(.*/\\)\\(s\\.\\)\\(.*\\)" master)
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(replace-match "p." t t master 2))))
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(defun vc-sccs-parse-locks ()
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"Parse SCCS locks in current buffer.
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The result is a list of the form ((VERSION . USER) (VERSION . USER) ...)."
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(let (master-locks)
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(goto-char (point-min))
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(while (re-search-forward "^\\([0-9.]+\\) [0-9.]+ \\([^ ]+\\) .*\n?"
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nil t)
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(setq master-locks
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(cons (cons (match-string 1) (match-string 2)) master-locks)))
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;; FIXME: is it really necessary to reverse ?
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(nreverse master-locks)))
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(defun vc-sccs-add-triple (name file rev)
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(with-current-buffer
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(find-file-noselect
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(expand-file-name vc-sccs-name-assoc-file
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(file-name-directory (vc-name file))))
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(goto-char (point-max))
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(insert name "\t:\t" file "\t" rev "\n")
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(basic-save-buffer)
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(kill-buffer (current-buffer))))
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(defun vc-sccs-lookup-triple (file name)
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"Return the numeric version corresponding to a named snapshot of FILE.
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If NAME is nil or a version number string it's just passed through."
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(if (or (null name)
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(let ((firstchar (aref name 0)))
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(and (>= firstchar ?0) (<= firstchar ?9))))
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name
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(with-temp-buffer
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(vc-insert-file
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(expand-file-name vc-sccs-name-assoc-file
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(file-name-directory (vc-name file))))
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(vc-parse-buffer (concat name "\t:\t" file "\t\\(.+\\)") 1))))
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(provide 'vc-sccs)
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;;; vc-sccs.el ends here
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