;;; vc-rcs.el --- support for RCS version-control
-;; Copyright (C) 1992,93,94,95,96,97,98,99,2000,2001 Free Software Foundation, Inc.
+;; Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
+;; 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+;; Free Software Foundation, Inc.
;; Author: FSF (see vc.el for full credits)
;; Maintainer: Andre Spiegel <spiegel@gnu.org>
-;; $Id$
-
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 2, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
(require 'vc))
(defcustom vc-rcs-release nil
- "*The release number of your RCS installation, as a string.
+ "The release number of your RCS installation, as a string.
If nil, VC itself computes this value when it is first needed."
:type '(choice (const :tag "Auto" nil)
(string :tag "Specified")
:group 'vc)
(defcustom vc-rcs-register-switches nil
- "*Extra switches for registering a file in RCS.
-A string or list of strings. These are passed to the checkin program
-by \\[vc-rcs-register]."
- :type '(choice (const :tag "None" nil)
+ "Switches for registering a file in RCS.
+A string or list of strings passed to the checkin program by
+\\[vc-register]. If nil, use the value of `vc-register-switches'.
+If t, use no switches."
+ :type '(choice (const :tag "Unspecified" nil)
+ (const :tag "None" t)
(string :tag "Argument String")
- (repeat :tag "Argument List"
- :value ("")
- string))
+ (repeat :tag "Argument List" :value ("") string))
:version "21.1"
:group 'vc)
(defcustom vc-rcs-diff-switches nil
- "*A string or list of strings specifying extra switches for rcsdiff under VC."
- :type '(choice (const :tag "None" nil)
+ "String or list of strings specifying switches for RCS diff under VC.
+If nil, use the value of `vc-diff-switches'. If t, use no switches."
+ :type '(choice (const :tag "Unspecified" nil)
+ (const :tag "None" t)
(string :tag "Argument String")
- (repeat :tag "Argument List"
- :value ("")
- string))
+ (repeat :tag "Argument List" :value ("") string))
:version "21.1"
:group 'vc)
(defcustom vc-rcs-header (or (cdr (assoc 'RCS vc-header-alist)) '("\$Id\$"))
- "*Header keywords to be inserted by `vc-insert-headers'."
+ "Header keywords to be inserted by `vc-insert-headers'."
:type '(repeat string)
:version "21.1"
:group 'vc)
(defcustom vc-rcsdiff-knows-brief nil
- "*Indicates whether rcsdiff understands the --brief option.
+ "Indicates whether rcsdiff understands the --brief option.
The value is either `yes', `no', or nil. If it is nil, VC tries
to use --brief and sets this variable to remember whether it worked."
:type '(choice (const :tag "Work out" nil) (const yes) (const no))
;;;###autoload
(defcustom vc-rcs-master-templates
'("%sRCS/%s,v" "%s%s,v" "%sRCS/%s")
- "*Where to look for RCS master files.
+ "Where to look for RCS master files.
For a description of possible values, see `vc-check-master-templates'."
:type '(choice (const :tag "Use standard RCS file names"
'("%sRCS/%s,v" "%s%s,v" "%sRCS/%s"))
:group 'vc)
\f
+;;; Properties of the backend
+
+(defun vc-rcs-revision-granularity () 'file)
+
+(defun vc-rcs-checkout-model (files)
+ "RCS-specific version of `vc-checkout-model'."
+ (let ((file (if (consp files) (car files) files))
+ result)
+ (when vc-consult-headers
+ (vc-file-setprop file 'vc-checkout-model nil)
+ (vc-rcs-consult-headers file)
+ (setq result (vc-file-getprop file 'vc-checkout-model)))
+ (or result
+ (progn (vc-rcs-fetch-master-state file)
+ (vc-file-getprop file 'vc-checkout-model)))))
+
;;;
;;; State-querying functions
;;;
-;;; The autoload cookie below places vc-rcs-registered directly into
-;;; loaddefs.el, so that vc-rcs.el does not need to be loaded for
-;;; every file that is visited. The definition is repeated below
-;;; so that Help and etags can find it.
-
-;;;###autoload (defun vc-rcs-registered (f) (vc-default-registered 'RCS f))
-(defun vc-rcs-registered (f) (vc-default-registered 'RCS f))
+;; The autoload cookie below places vc-rcs-registered directly into
+;; loaddefs.el, so that vc-rcs.el does not need to be loaded for
+;; every file that is visited.
+;;;###autoload
+(progn
+(defun vc-rcs-registered (f) (vc-default-registered 'RCS f)))
(defun vc-rcs-state (file)
"Implementation of `vc-state' for RCS."
- (or (boundp 'vc-rcs-headers-result)
- (and vc-consult-headers
- (vc-rcs-consult-headers file)))
- (let ((state
- ;; vc-workfile-version might not be known; in that case the
- ;; property is nil. vc-rcs-fetch-master-state knows how to
- ;; handle that.
- (vc-rcs-fetch-master-state file
- (vc-file-getprop file
- 'vc-workfile-version))))
- (if (not (eq state 'up-to-date))
- state
- (if (vc-workfile-unchanged-p file)
- 'up-to-date
- (if (eq (vc-checkout-model file) 'locking)
- 'unlocked-changes
- 'edited)))))
+ (if (not (vc-rcs-registered file))
+ 'unregistered
+ (or (boundp 'vc-rcs-headers-result)
+ (and vc-consult-headers
+ (vc-rcs-consult-headers file)))
+ (let ((state
+ ;; vc-working-revision might not be known; in that case the
+ ;; property is nil. vc-rcs-fetch-master-state knows how to
+ ;; handle that.
+ (vc-rcs-fetch-master-state file
+ (vc-file-getprop file
+ 'vc-working-revision))))
+ (if (not (eq state 'up-to-date))
+ state
+ (if (vc-workfile-unchanged-p file)
+ 'up-to-date
+ (if (eq (vc-rcs-checkout-model (list file)) 'locking)
+ 'unlocked-changes
+ 'edited))))))
(defun vc-rcs-state-heuristic (file)
"State heuristic for RCS."
;; permissions can tell us whether locking is used for
;; the file or not.
(if (and (eq state 'up-to-date)
- (not (vc-mistrust-permissions file)))
+ (not (vc-mistrust-permissions file))
+ (file-exists-p file))
(cond
((string-match ".rw..-..-." (nth 8 (file-attributes file)))
(vc-file-setprop file 'vc-checkout-model 'implicit)
(vc-file-setprop file 'vc-checkout-model 'locking))))
state)
(if (not (vc-mistrust-permissions file))
- (let* ((attributes (file-attributes file))
- (owner-uid (nth 2 attributes))
+ (let* ((attributes (file-attributes file 'string))
+ (owner-name (nth 2 attributes))
(permissions (nth 8 attributes)))
- (cond ((string-match ".r-..-..-." permissions)
+ (cond ((and permissions (string-match ".r-..-..-." permissions))
(vc-file-setprop file 'vc-checkout-model 'locking)
'up-to-date)
- ((string-match ".rw..-..-." permissions)
- (if (eq (vc-checkout-model file) 'locking)
+ ((and permissions (string-match ".rw..-..-." permissions))
+ (if (eq (vc-rcs-checkout-model file) 'locking)
(if (file-ownership-preserved-p file)
'edited
- (vc-user-login-name owner-uid))
+ owner-name)
(if (vc-rcs-workfile-is-newer file)
'edited
'up-to-date)))
(vc-rcs-state file))))
(vc-rcs-state file)))))
-(defun vc-rcs-workfile-version (file)
- "RCS-specific version of `vc-workfile-version'."
+(defun vc-rcs-dir-status (dir update-function)
+ ;; FIXME: this function should be rewritten or `vc-expand-dirs'
+ ;; should be changed to take a backend parameter. Using
+ ;; `vc-expand-dirs' is not TRTD because it returns files from
+ ;; multiple backends. It should also return 'unregistered files.
+
+ ;; Doing individual vc-state calls is painful but there
+ ;; is no better way in RCS-land.
+ (let ((flist (vc-expand-dirs (list dir)))
+ (result nil))
+ (dolist (file flist)
+ (let ((state (vc-state file))
+ (frel (file-relative-name file)))
+ (when (and (eq (vc-backend file) 'RCS)
+ (not (eq state 'up-to-date)))
+ (push (list frel state) result))))
+ (funcall update-function result)))
+
+(defun vc-rcs-working-revision (file)
+ "RCS-specific version of `vc-working-revision'."
(or (and vc-consult-headers
(vc-rcs-consult-headers file)
- (vc-file-getprop file 'vc-workfile-version))
+ (vc-file-getprop file 'vc-working-revision))
(progn
(vc-rcs-fetch-master-state file)
- (vc-file-getprop file 'vc-workfile-version))))
+ (vc-file-getprop file 'vc-working-revision))))
(defun vc-rcs-latest-on-branch-p (file &optional version)
"Return non-nil if workfile version of FILE is the latest on its branch.
When VERSION is given, perform check for that version."
- (unless version (setq version (vc-workfile-version file)))
+ (unless version (setq version (vc-working-revision file)))
(with-temp-buffer
(string= version
(if (vc-trunk-p version)
(vc-insert-file (vc-name file) "^desc")
(vc-rcs-find-most-recent-rev (vc-branch-part version))))))
-(defun vc-rcs-checkout-model (file)
- "RCS-specific version of `vc-checkout-model'."
- (let (result)
- (when vc-consult-headers
- (vc-file-setprop file 'vc-checkout-model nil)
- (vc-rcs-consult-headers file)
- (setq result (vc-file-getprop file 'vc-checkout-model)))
- (or result
- (progn (vc-rcs-fetch-master-state file)
- (vc-file-getprop file 'vc-checkout-model)))))
-
(defun vc-rcs-workfile-unchanged-p (file)
- "RCS-specific implementation of vc-workfile-unchanged-p."
+ "RCS-specific implementation of `vc-workfile-unchanged-p'."
;; Try to use rcsdiff --brief. If rcsdiff does not understand that,
;; do a double take and remember the fact for the future
- (let* ((version (concat "-r" (vc-workfile-version file)))
+ (let* ((version (concat "-r" (vc-working-revision file)))
(status (if (eq vc-rcsdiff-knows-brief 'no)
- (vc-do-command nil 1 "rcsdiff" file version)
- (vc-do-command nil 2 "rcsdiff" file "--brief" version))))
+ (vc-do-command "*vc*" 1 "rcsdiff" file version)
+ (vc-do-command "*vc*" 2 "rcsdiff" file "--brief" version))))
(if (eq status 2)
(if (not vc-rcsdiff-knows-brief)
(setq vc-rcsdiff-knows-brief 'no
- status (vc-do-command nil 1 "rcsdiff" file version))
+ status (vc-do-command "*vc*" 1 "rcsdiff" file version))
(error "rcsdiff failed"))
(if (not vc-rcsdiff-knows-brief) (setq vc-rcsdiff-knows-brief 'yes)))
;; The workfile is unchanged if rcsdiff found no differences.
(zerop status)))
+(defun vc-rcs-find-file-not-found-hook ()
+ (if (yes-or-no-p
+ (format "File %s was lost; check out from version control? "
+ (file-name-nondirectory buffer-file-name)))
+ (save-excursion
+ (require 'vc)
+ (let ((default-directory (file-name-directory buffer-file-name)))
+ (not (vc-error-occurred (vc-checkout buffer-file-name)))))))
\f
;;;
;;; State-changing functions
;;;
-(defun vc-rcs-register (file &optional rev comment)
- "Register FILE into the RCS version-control system.
-REV is the optional revision number for the file. COMMENT can be used
-to provide an initial description of FILE.
+(defun vc-rcs-create-repo ()
+ "Create a new RCS repository."
+ ;; RCS is totally file-oriented, so all we have to do is make the directory.
+ (make-directory "RCS"))
-`vc-register-switches' and `vc-rcs-register-switches' are passed to
-the RCS command (in that order).
+(defun vc-rcs-register (files &optional rev comment)
+ "Register FILES into the RCS version-control system.
+REV is the optional revision number for the files. COMMENT can be used
+to provide an initial description for each FILES.
+Passes either `vc-rcs-register-switches' or `vc-register-switches'
+to the RCS command.
Automatically retrieve a read-only version of the file with keywords
expanded if `vc-keep-workfiles' is non-nil, otherwise, delete the workfile."
- (let ((subdir (expand-file-name "RCS" (file-name-directory file))))
- (and (not (file-exists-p subdir))
+ (let (subdir name)
+ (dolist (file files)
+ (and (not (file-exists-p
+ (setq subdir (expand-file-name "RCS"
+ (file-name-directory file)))))
(not (directory-files (file-name-directory file)
nil ".*,v$" t))
(yes-or-no-p "Create RCS subdirectory? ")
(make-directory subdir))
- (apply 'vc-do-command nil 0 "ci" file
+ (apply 'vc-do-command "*vc*" 0 "ci" file
;; if available, use the secure registering option
(and (vc-rcs-release-p "5.6.4") "-i")
(concat (if vc-keep-workfiles "-u" "-r") rev)
(vc-switches 'RCS 'register))
;; parse output to find master file name and workfile version
(with-current-buffer "*vc*"
- (goto-char (point-min))
- (let ((name (if (looking-at (concat "^\\(.*\\) <-- "
- (file-name-nondirectory file)))
- (match-string 1))))
- (if (not name)
- ;; if we couldn't find the master name,
- ;; run vc-rcs-registered to get it
- ;; (will be stored into the vc-name property)
- (vc-rcs-registered file)
- (vc-file-setprop file 'vc-name
- (if (file-name-absolute-p name)
- name
- (expand-file-name
- name
- (file-name-directory file))))))
- (vc-file-setprop file 'vc-workfile-version
- (if (re-search-forward
- "^initial revision: \\([0-9.]+\\).*\n"
- nil t)
- (match-string 1))))))
+ (goto-char (point-min))
+ (if (not (setq name
+ (if (looking-at (concat "^\\(.*\\) <-- "
+ (file-name-nondirectory file)))
+ (match-string 1))))
+ ;; if we couldn't find the master name,
+ ;; run vc-rcs-registered to get it
+ ;; (will be stored into the vc-name property)
+ (vc-rcs-registered file)
+ (vc-file-setprop file 'vc-name
+ (if (file-name-absolute-p name)
+ name
+ (expand-file-name
+ name
+ (file-name-directory file))))))
+ (vc-file-setprop file 'vc-working-revision
+ (if (re-search-forward
+ "^initial revision: \\([0-9.]+\\).*\n"
+ nil t)
+ (match-string 1))))))
(defun vc-rcs-responsible-p (file)
"Return non-nil if RCS thinks it would be responsible for registering FILE."
(defun vc-rcs-receive-file (file rev)
"Implementation of receive-file for RCS."
- (let ((checkout-model (vc-checkout-model file)))
+ (let ((checkout-model (vc-rcs-checkout-model (list file))))
(vc-rcs-register file rev "")
(when (eq checkout-model 'implicit)
(vc-rcs-set-non-strict-locking file))
(yes-or-no-p (format "Directory %s is empty; remove it? " dir))
(delete-directory dir))))
-(defun vc-rcs-checkin (file rev comment)
+(defun vc-rcs-checkin (files rev comment)
"RCS-specific version of `vc-backend-checkin'."
(let ((switches (vc-switches 'RCS 'checkin)))
- (let ((old-version (vc-workfile-version file)) new-version
- (default-branch (vc-file-getprop file 'vc-rcs-default-branch)))
- ;; Force branch creation if an appropriate
- ;; default branch has been set.
- (and (not rev)
- default-branch
- (string-match (concat "^" (regexp-quote old-version) "\\.")
- default-branch)
- (setq rev default-branch)
- (setq switches (cons "-f" switches)))
- (if (and (not rev) old-version)
- (setq rev (vc-branch-part old-version)))
- (apply 'vc-do-command nil 0 "ci" (vc-name file)
- ;; if available, use the secure check-in option
- (and (vc-rcs-release-p "5.6.4") "-j")
- (concat (if vc-keep-workfiles "-u" "-r") rev)
- (concat "-m" comment)
- switches)
- (vc-file-setprop file 'vc-workfile-version nil)
-
- ;; determine the new workfile version
- (set-buffer "*vc*")
- (goto-char (point-min))
- (when (or (re-search-forward
- "new revision: \\([0-9.]+\\);" nil t)
- (re-search-forward
- "reverting to previous revision \\([0-9.]+\\)" nil t))
- (setq new-version (match-string 1))
- (vc-file-setprop file 'vc-workfile-version new-version))
-
- ;; if we got to a different branch, adjust the default
- ;; branch accordingly
- (cond
- ((and old-version new-version
- (not (string= (vc-branch-part old-version)
- (vc-branch-part new-version))))
- (vc-rcs-set-default-branch file
- (if (vc-trunk-p new-version) nil
- (vc-branch-part new-version)))
- ;; If this is an old RCS release, we might have
- ;; to remove a remaining lock.
- (if (not (vc-rcs-release-p "5.6.2"))
- ;; exit status of 1 is also accepted.
- ;; It means that the lock was removed before.
- (vc-do-command nil 1 "rcs" (vc-name file)
- (concat "-u" old-version))))))))
-
-(defun vc-rcs-find-version (file rev buffer)
+ ;; Now operate on the files
+ (dolist (file (vc-expand-dirs files))
+ (let ((old-version (vc-working-revision file)) new-version
+ (default-branch (vc-file-getprop file 'vc-rcs-default-branch)))
+ ;; Force branch creation if an appropriate
+ ;; default branch has been set.
+ (and (not rev)
+ default-branch
+ (string-match (concat "^" (regexp-quote old-version) "\\.")
+ default-branch)
+ (setq rev default-branch)
+ (setq switches (cons "-f" switches)))
+ (if (and (not rev) old-version)
+ (setq rev (vc-branch-part old-version)))
+ (apply 'vc-do-command "*vc*" 0 "ci" (vc-name file)
+ ;; if available, use the secure check-in option
+ (and (vc-rcs-release-p "5.6.4") "-j")
+ (concat (if vc-keep-workfiles "-u" "-r") rev)
+ (concat "-m" comment)
+ switches)
+ (vc-file-setprop file 'vc-working-revision nil)
+
+ ;; determine the new workfile version
+ (set-buffer "*vc*")
+ (goto-char (point-min))
+ (when (or (re-search-forward
+ "new revision: \\([0-9.]+\\);" nil t)
+ (re-search-forward
+ "reverting to previous revision \\([0-9.]+\\)" nil t))
+ (setq new-version (match-string 1))
+ (vc-file-setprop file 'vc-working-revision new-version))
+
+ ;; if we got to a different branch, adjust the default
+ ;; branch accordingly
+ (cond
+ ((and old-version new-version
+ (not (string= (vc-branch-part old-version)
+ (vc-branch-part new-version))))
+ (vc-rcs-set-default-branch file
+ (if (vc-trunk-p new-version) nil
+ (vc-branch-part new-version)))
+ ;; If this is an old RCS release, we might have
+ ;; to remove a remaining lock.
+ (if (not (vc-rcs-release-p "5.6.2"))
+ ;; exit status of 1 is also accepted.
+ ;; It means that the lock was removed before.
+ (vc-do-command "*vc*" 1 "rcs" (vc-name file)
+ (concat "-u" old-version)))))))))
+
+(defun vc-rcs-find-revision (file rev buffer)
(apply 'vc-do-command
- buffer 0 "co" (vc-name file)
+ (or buffer "*vc*") 0 "co" (vc-name file)
"-q" ;; suppress diagnostic output
(concat "-p" rev)
(vc-switches 'RCS 'checkout)))
(defun vc-rcs-checkout (file &optional editable rev)
- "Retrieve a copy of a saved version of FILE."
- (let ((file-buffer (get-file-buffer file))
- switches)
- (message "Checking out %s..." file)
- (save-excursion
- ;; Change buffers to get local value of vc-checkout-switches.
- (if file-buffer (set-buffer file-buffer))
- (setq switches (vc-switches 'RCS 'checkout))
- ;; Save this buffer's default-directory
- ;; and use save-excursion to make sure it is restored
- ;; in the same buffer it was saved in.
- (let ((default-directory default-directory))
- (save-excursion
- ;; Adjust the default-directory so that the check-out creates
- ;; the file in the right place.
- (setq default-directory (file-name-directory file))
- (let (new-version)
- ;; if we should go to the head of the trunk,
- ;; clear the default branch first
- (and rev (string= rev "")
- (vc-rcs-set-default-branch file nil))
- ;; now do the checkout
- (apply 'vc-do-command
- nil 0 "co" (vc-name file)
- ;; If locking is not strict, force to overwrite
- ;; the writable workfile.
- (if (eq (vc-checkout-model file) 'implicit) "-f")
- (if editable "-l")
- (if (stringp rev)
- ;; a literal revision was specified
- (concat "-r" rev)
- (let ((workrev (vc-workfile-version file)))
- (if workrev
- (concat "-r"
- (if (not rev)
- ;; no revision specified:
- ;; use current workfile version
- workrev
- ;; REV is t ...
- (if (not (vc-trunk-p workrev))
- ;; ... go to head of current branch
- (vc-branch-part workrev)
- ;; ... go to head of trunk
- (vc-rcs-set-default-branch file
+ "Retrieve a copy of a saved version of FILE. If FILE is a directory,
+attempt the checkout for all registered files beneath it."
+ (if (file-directory-p file)
+ (mapc 'vc-rcs-checkout (vc-expand-dirs (list file)))
+ (let ((file-buffer (get-file-buffer file))
+ switches)
+ (message "Checking out %s..." file)
+ (save-excursion
+ ;; Change buffers to get local value of vc-checkout-switches.
+ (if file-buffer (set-buffer file-buffer))
+ (setq switches (vc-switches 'RCS 'checkout))
+ ;; Save this buffer's default-directory
+ ;; and use save-excursion to make sure it is restored
+ ;; in the same buffer it was saved in.
+ (let ((default-directory default-directory))
+ (save-excursion
+ ;; Adjust the default-directory so that the check-out creates
+ ;; the file in the right place.
+ (setq default-directory (file-name-directory file))
+ (let (new-version)
+ ;; if we should go to the head of the trunk,
+ ;; clear the default branch first
+ (and rev (string= rev "")
+ (vc-rcs-set-default-branch file nil))
+ ;; now do the checkout
+ (apply 'vc-do-command
+ "*vc*" 0 "co" (vc-name file)
+ ;; If locking is not strict, force to overwrite
+ ;; the writable workfile.
+ (if (eq (vc-rcs-checkout-model (list file)) 'implicit) "-f")
+ (if editable "-l")
+ (if (stringp rev)
+ ;; a literal revision was specified
+ (concat "-r" rev)
+ (let ((workrev (vc-working-revision file)))
+ (if workrev
+ (concat "-r"
+ (if (not rev)
+ ;; no revision specified:
+ ;; use current workfile version
+ workrev
+ ;; REV is t ...
+ (if (not (vc-trunk-p workrev))
+ ;; ... go to head of current branch
+ (vc-branch-part workrev)
+ ;; ... go to head of trunk
+ (vc-rcs-set-default-branch file
nil)
""))))))
switches)
(with-current-buffer "*vc*"
(setq new-version
(vc-parse-buffer "^revision \\([0-9.]+\\).*\n" 1)))
- (vc-file-setprop file 'vc-workfile-version new-version)
+ (vc-file-setprop file 'vc-working-revision new-version)
;; if necessary, adjust the default branch
(and rev (not (string= rev ""))
- (vc-rcs-set-default-branch
+ (vc-rcs-set-default-branch
file
(if (vc-rcs-latest-on-branch-p file new-version)
(if (vc-trunk-p new-version) nil
(vc-branch-part new-version))
new-version)))))
- (message "Checking out %s...done" file)))))
+ (message "Checking out %s...done" file))))))
+
+(defun vc-rcs-rollback (files)
+ "Roll back, undoing the most recent checkins of FILES. Directories are
+expanded to all registered subfiles in them."
+ (if (not files)
+ (error "RCS backend doesn't support directory-level rollback."))
+ (dolist (file (vc-expand-dirs files))
+ (let* ((discard (vc-working-revision file))
+ (previous (if (vc-trunk-p discard) "" (vc-branch-part discard)))
+ (config (current-window-configuration))
+ (done nil))
+ (if (null (yes-or-no-p (format "Remove version %s from %s history? "
+ discard file)))
+ (error "Aborted"))
+ (message "Removing revision %s from %s." discard file)
+ (vc-do-command "*vc*" 0 "rcs" (vc-name file) (concat "-o" discard))
+ ;; Check out the most recent remaining version. If it
+ ;; fails, because the whole branch got deleted, do a
+ ;; double-take and check out the version where the branch
+ ;; started.
+ (while (not done)
+ (condition-case err
+ (progn
+ (vc-do-command "*vc*" 0 "co" (vc-name file) "-f"
+ (concat "-u" previous))
+ (setq done t))
+ (error (set-buffer "*vc*")
+ (goto-char (point-min))
+ (if (search-forward "no side branches present for" nil t)
+ (progn (setq previous (vc-branch-part previous))
+ (vc-rcs-set-default-branch file previous)
+ ;; vc-do-command popped up a window with
+ ;; the error message. Get rid of it, by
+ ;; restoring the old window configuration.
+ (set-window-configuration config))
+ ;; No, it was some other error: re-signal it.
+ (signal (car err) (cdr err)))))))))
(defun vc-rcs-revert (file &optional contents-done)
- "Revert FILE to the version it was based on."
- (vc-do-command nil 0 "co" (vc-name file) "-f"
- (concat (if (eq (vc-state file) 'edited) "-u" "-r")
- (vc-workfile-version file))))
-
-(defun vc-rcs-cancel-version (file editable)
- "Undo the most recent checkin of FILE.
-EDITABLE non-nil means previous version should be locked."
- (let* ((target (vc-workfile-version file))
- (previous (if (vc-trunk-p target) "" (vc-branch-part target)))
- (config (current-window-configuration))
- (done nil))
- (vc-do-command nil 0 "rcs" (vc-name file) (concat "-o" target))
- ;; Check out the most recent remaining version. If it fails, because
- ;; the whole branch got deleted, do a double-take and check out the
- ;; version where the branch started.
- (while (not done)
- (condition-case err
- (progn
- (vc-do-command nil 0 "co" (vc-name file) "-f"
- (concat (if editable "-l" "-u") previous))
- (setq done t))
- (error (set-buffer "*vc*")
- (goto-char (point-min))
- (if (search-forward "no side branches present for" nil t)
- (progn (setq previous (vc-branch-part previous))
- (vc-rcs-set-default-branch file previous)
- ;; vc-do-command popped up a window with
- ;; the error message. Get rid of it, by
- ;; restoring the old window configuration.
- (set-window-configuration config))
- ;; No, it was some other error: re-signal it.
- (signal (car err) (cdr err))))))))
+ "Revert FILE to the version it was based on. If FILE is a directory,
+revert all registered files beneath it."
+ (if (file-directory-p file)
+ (mapc 'vc-rcs-revert (vc-expand-dirs (list file)))
+ (vc-do-command "*vc*" 0 "co" (vc-name file) "-f"
+ (concat (if (eq (vc-state file) 'edited) "-u" "-r")
+ (vc-working-revision file)))))
(defun vc-rcs-merge (file first-version &optional second-version)
"Merge changes into current working copy of FILE.
The changes are between FIRST-VERSION and SECOND-VERSION."
- (vc-do-command nil 1 "rcsmerge" (vc-name file)
+ (vc-do-command "*vc*" 1 "rcsmerge" (vc-name file)
"-kk" ; ignore keyword conflicts
(concat "-r" first-version)
(if second-version (concat "-r" second-version))))
(defun vc-rcs-steal-lock (file &optional rev)
"Steal the lock on the current workfile for FILE and revision REV.
+If FILE is a directory, steal the lock on all registered files beneath it.
Needs RCS 5.6.2 or later for -M."
- (vc-do-command nil 0 "rcs" (vc-name file) "-M" (concat "-u" rev))
- ;; Do a real checkout after stealing the lock, so that we see
- ;; expanded headers.
- (vc-do-command nil 0 "co" (vc-name file) "-f" (concat "-l" rev)))
-
+ (if (file-directory-p file)
+ (mapc 'vc-rcs-steal-lock (vc-expand-dirs (list file)))
+ (vc-do-command "*vc*" 0 "rcs" (vc-name file) "-M" (concat "-u" rev))
+ ;; Do a real checkout after stealing the lock, so that we see
+ ;; expanded headers.
+ (vc-do-command "*vc*" 0 "co" (vc-name file) "-f" (concat "-l" rev))))
+
+(defun vc-rcs-modify-change-comment (files rev comment)
+ "Modify the change comments change on FILES on a specified REV. If FILE is a
+directory the operation is applied to all registered files beneath it."
+ (dolist (file (vc-expand-dirs files))
+ (vc-do-command "*vc*" 0 "rcs" (vc-name file)
+ (concat "-m" rev ":" comment))))
\f
;;;
;;; History functions
;;;
-(defun vc-rcs-print-log (file &optional buffer)
- "Get change log associated with FILE."
- (vc-do-command buffer 0 "rlog" (vc-name file)))
+(defun vc-rcs-print-log (files &optional buffer)
+ "Get change log associated with FILE. If FILE is a
+directory the operation is applied to all registered files beneath it."
+ (vc-do-command (or buffer "*vc*") 0 "rlog" (mapcar 'vc-name (vc-expand-dirs files))))
-(defun vc-rcs-diff (file &optional oldvers newvers buffer)
- "Get a difference report using RCS between two versions of FILE."
- (if (not oldvers) (setq oldvers (vc-workfile-version file)))
- (apply 'vc-do-command (or buffer "*vc-diff*") 1 "rcsdiff" file
+(defun vc-rcs-diff (files &optional oldvers newvers buffer)
+ "Get a difference report using RCS between two sets of files."
+ (apply 'vc-do-command (or buffer "*vc-diff*")
+ 1 ;; Always go synchronous, the repo is local
+ "rcsdiff" (vc-expand-dirs files)
(append (list "-q"
- (concat "-r" oldvers)
+ (and oldvers (concat "-r" oldvers))
(and newvers (concat "-r" newvers)))
(vc-switches 'RCS 'diff))))
+(defun vc-rcs-comment-history (file)
+ "Return a string with all log entries stored in BACKEND for FILE."
+ (with-current-buffer "*vc*"
+ ;; Has to be written this way, this function is used by the CVS backend too
+ (vc-call-backend (vc-backend file) 'print-log (list file))
+ ;; Remove cruft
+ (let ((separator (concat "^-+\nrevision [0-9.]+\ndate: .*\n"
+ "\\(branches: .*;\n\\)?"
+ "\\(\\*\\*\\* empty log message \\*\\*\\*\n\\)?")))
+ (goto-char (point-max)) (forward-line -1)
+ (while (looking-at "=*\n")
+ (delete-char (- (match-end 0) (match-beginning 0)))
+ (forward-line -1))
+ (goto-char (point-min))
+ (if (looking-at "[\b\t\n\v\f\r ]+")
+ (delete-char (- (match-end 0) (match-beginning 0))))
+ (goto-char (point-min))
+ (re-search-forward separator nil t)
+ (delete-region (point-min) (point))
+ (while (re-search-forward separator nil t)
+ (delete-region (match-beginning 0) (match-end 0))))
+ ;; Return the de-crufted comment list
+ (buffer-string)))
+
+(defun vc-rcs-annotate-command (file buffer &optional revision)
+ "Annotate FILE, inserting the results in BUFFER.
+Optional arg REVISION is a revision to annotate from."
+ (vc-setup-buffer buffer)
+ ;; Aside from the "head revision on the trunk", the instructions for
+ ;; each revision on the trunk are an ordered list of kill and insert
+ ;; commands necessary to go from the chronologically-following
+ ;; revision to this one. That is, associated with revision N are
+ ;; edits that applied to revision N+1 would result in revision N.
+ ;;
+ ;; On a branch, however, (some) things are inverted: the commands
+ ;; listed are those necessary to go from the chronologically-preceding
+ ;; revision to this one. That is, associated with revision N are
+ ;; edits that applied to revision N-1 would result in revision N.
+ ;;
+ ;; So, to get per-line history info, we apply reverse-chronological
+ ;; edits, starting with the head revision on the trunk, all the way
+ ;; back through the initial revision (typically "1.1" or similar),
+ ;; then apply forward-chronological edits -- keeping track of which
+ ;; revision is associated with each inserted line -- until we reach
+ ;; the desired revision for display (which may be either on the trunk
+ ;; or on a branch).
+ (let* ((tree (with-temp-buffer
+ (insert-file-contents (vc-rcs-registered file))
+ (vc-rcs-parse)))
+ (revisions (cdr (assq 'revisions tree)))
+ ;; The revision N whose instructions we currently are processing.
+ (cur (cdr (assq 'head (cdr (assq 'headers tree)))))
+ ;; Alist from the parse tree for N.
+ (meta (cdr (assoc cur revisions)))
+ ;; Point and temporary string, respectively.
+ p s
+ ;; "Next-branch list". Nil means the desired revision to
+ ;; display lives on the trunk. Non-nil means it lives on a
+ ;; branch, in which case the value is a list of revision pairs
+ ;; (PARENT . CHILD), the first PARENT being on the trunk, that
+ ;; links each series of revisions in the path from the initial
+ ;; revision to the desired revision to display.
+ nbls
+ ;; "Path-accumulate-predicate plus revision/date/author".
+ ;; Until set, forward-chronological edits are not accumulated.
+ ;; Once set, its value (updated every revision) is used for
+ ;; the text property `:vc-rcs-r/d/a' for inserts during
+ ;; processing of forward-chronological instructions for N.
+ ;; See internal func `r/d/a'.
+ prda
+ ;; List of forward-chronological instructions, each of the
+ ;; form: (POS . ACTION), where POS is a buffer position. If
+ ;; ACTION is a string, it is inserted, otherwise it is taken as
+ ;; the number of characters to be deleted.
+ path
+ ;; N+1. When `cur' is "", this is the initial revision.
+ pre)
+ (unless revision
+ (setq revision cur))
+ (unless (assoc revision revisions)
+ (error "No such revision: %s" revision))
+ ;; Find which branches (if any) must be included in the edits.
+ (let ((par revision)
+ bpt kids)
+ (while (setq bpt (vc-branch-part par)
+ par (vc-branch-part bpt))
+ (setq kids (cdr (assq 'branches (cdr (assoc par revisions)))))
+ ;; A branchpoint may have multiple children. Find the right one.
+ (while (not (string= bpt (vc-branch-part (car kids))))
+ (setq kids (cdr kids)))
+ (push (cons par (car kids)) nbls)))
+ ;; Start with the full text.
+ (set-buffer buffer)
+ (insert (cdr (assq 'text meta)))
+ ;; Apply reverse-chronological edits on the trunk, computing and
+ ;; accumulating forward-chronological edits after some point, for
+ ;; later.
+ (flet ((r/d/a () (vector pre
+ (cdr (assq 'date meta))
+ (cdr (assq 'author meta)))))
+ (while (when (setq pre cur cur (cdr (assq 'next meta)))
+ (not (string= "" cur)))
+ (setq
+ ;; Start accumulating the forward-chronological edits when N+1
+ ;; on the trunk is either the desired revision to display, or
+ ;; the appropriate branchpoint for it. Do this before
+ ;; updating `meta' since `r/d/a' uses N+1's `meta' value.
+ prda (when (or prda (string= (if nbls (caar nbls) revision) pre))
+ (r/d/a))
+ meta (cdr (assoc cur revisions)))
+ ;; Edits in the parse tree specify a line number (in the buffer
+ ;; *BEFORE* editing occurs) to start from, but line numbers
+ ;; change as a result of edits. To DTRT, we apply edits in
+ ;; order of descending buffer position so that edits further
+ ;; down in the buffer occur first w/o corrupting specified
+ ;; buffer positions of edits occurring towards the beginning of
+ ;; the buffer. In this way we avoid using markers. A pleasant
+ ;; property of this approach is ability to push instructions
+ ;; onto `path' directly, w/o need to maintain rev boundaries.
+ (dolist (insn (cdr (assq :insn meta)))
+ (goto-line (pop insn))
+ (setq p (point))
+ (case (pop insn)
+ (k (setq s (buffer-substring-no-properties
+ p (progn (forward-line (car insn))
+ (point))))
+ (when prda
+ (push `(,p . ,(propertize s :vc-rcs-r/d/a prda)) path))
+ (delete-region p (point)))
+ (i (setq s (car insn))
+ (when prda
+ (push `(,p . ,(length s)) path))
+ (insert s)))))
+ ;; For the initial revision, setting `:vc-rcs-r/d/a' directly is
+ ;; equivalent to pushing an insert instruction (of the entire buffer
+ ;; contents) onto `path' then erasing the buffer, but less wasteful.
+ (put-text-property (point-min) (point-max) :vc-rcs-r/d/a (r/d/a))
+ ;; Now apply the forward-chronological edits for the trunk.
+ (dolist (insn path)
+ (goto-char (pop insn))
+ (if (stringp insn)
+ (insert insn)
+ (delete-char insn)))
+ ;; Now apply the forward-chronological edits (directly from the
+ ;; parse-tree) for the branch(es), if necessary. We re-use vars
+ ;; `pre' and `meta' for the sake of internal func `r/d/a'.
+ (while nbls
+ (setq pre (cdr (pop nbls)))
+ (while (progn
+ (setq meta (cdr (assoc pre revisions))
+ prda nil)
+ (dolist (insn (cdr (assq :insn meta)))
+ (goto-line (pop insn))
+ (case (pop insn)
+ (k (delete-region
+ (point) (progn (forward-line (car insn))
+ (point))))
+ (i (insert (propertize
+ (car insn)
+ :vc-rcs-r/d/a
+ (or prda (setq prda (r/d/a))))))))
+ (prog1 (not (string= (if nbls (caar nbls) revision) pre))
+ (setq pre (cdr (assq 'next meta)))))))))
+ ;; Lastly, for each line, insert at bol nicely-formatted history info.
+ ;; We do two passes to collect summary information used to minimize
+ ;; the annotation's usage of screen real-estate: (1) Consider rendered
+ ;; width of revision plus author together as a unit; and (2) Omit
+ ;; author entirely if all authors are the same as the user.
+ (let ((ht (make-hash-table :test 'eq))
+ (me (user-login-name))
+ (maxw 0)
+ (all-me t)
+ rda w a)
+ (goto-char (point-max))
+ (while (not (bobp))
+ (forward-line -1)
+ (setq rda (get-text-property (point) :vc-rcs-r/d/a))
+ (unless (gethash rda ht)
+ (setq a (aref rda 2)
+ all-me (and all-me (string= a me)))
+ (puthash rda (setq w (+ (length (aref rda 0))
+ (length a)))
+ ht)
+ (setq maxw (max w maxw))))
+ (let ((padding (make-string maxw 32)))
+ (flet ((pad (w) (substring-no-properties padding w))
+ (render (rda &rest ls)
+ (propertize
+ (apply 'concat
+ (format-time-string "%Y-%m-%d" (aref rda 1))
+ " "
+ (aref rda 0)
+ ls)
+ :vc-annotate-prefix t
+ :vc-rcs-r/d/a rda)))
+ (maphash
+ (if all-me
+ (lambda (rda w)
+ (puthash rda (render rda (pad w) ": ") ht))
+ (lambda (rda w)
+ (puthash rda (render rda " " (pad w) " " (aref rda 2) ": ") ht)))
+ ht)))
+ (while (not (eobp))
+ (insert (gethash (get-text-property (point) :vc-rcs-r/d/a) ht))
+ (forward-line 1))))
+
+(declare-function vc-annotate-convert-time "vc-annotate" (time))
+
+(defun vc-rcs-annotate-current-time ()
+ "Return the current time, based at midnight of the current day, and
+encoded as fractional days."
+ (vc-annotate-convert-time
+ (apply 'encode-time 0 0 0 (nthcdr 3 (decode-time (current-time))))))
+
+(defun vc-rcs-annotate-time ()
+ "Return the time of the next annotation (as fraction of days)
+systime, or nil if there is none. Also, reposition point."
+ (unless (eobp)
+ (prog1 (vc-annotate-convert-time
+ (aref (get-text-property (point) :vc-rcs-r/d/a) 1))
+ (goto-char (next-single-property-change (point) :vc-annotate-prefix)))))
+
+(defun vc-rcs-annotate-extract-revision-at-line ()
+ (aref (get-text-property (point) :vc-rcs-r/d/a) 0))
+
\f
;;;
-;;; Snapshot system
+;;; Tag system
;;;
-(defun vc-rcs-assign-name (file name)
- "Assign to FILE's latest version a given NAME."
- (vc-do-command nil 0 "rcs" (vc-name file) (concat "-n" name ":")))
+(defun vc-rcs-create-tag (backend dir name branchp)
+ (when branchp
+ (error "RCS backend %s does not support module branches" backend))
+ (let ((result (vc-tag-precondition dir)))
+ (if (stringp result)
+ (error "File %s is not up-to-date" result)
+ (vc-file-tree-walk
+ dir
+ (lambda (f)
+ (vc-do-command "*vc*" 0 "rcs" (vc-name f) (concat "-n" name ":")))))))
\f
;;;
(or value
(vc-branch-part branch))))
-(defun vc-rcs-fetch-master-state (file &optional workfile-version)
+(defun vc-rcs-fetch-master-state (file &optional working-revision)
"Compute the master file's idea of the state of FILE.
-If a WORKFILE-VERSION is given, compute the state of that version,
+If a WORKING-REVISION is given, compute the state of that version,
otherwise determine the workfile version based on the master file.
-This function sets the properties `vc-workfile-version' and
+This function sets the properties `vc-working-revision' and
`vc-checkout-model' to their correct values, based on the master
file."
(with-temp-buffer
(let ((workfile-is-latest nil)
(default-branch (vc-parse-buffer "^branch[ \t\n]+\\([^;]*\\);" 1)))
(vc-file-setprop file 'vc-rcs-default-branch default-branch)
- (unless workfile-version
+ (unless working-revision
;; Workfile version not known yet. Determine that first. It
;; is either the head of the trunk, the head of the default
;; branch, or the "default branch" itself, if that is a full
(cond
;; no default branch
((or (not default-branch) (string= "" default-branch))
- (setq workfile-version
+ (setq working-revision
(vc-parse-buffer "^head[ \t\n]+\\([^;]+\\);" 1))
(setq workfile-is-latest t))
;; default branch is actually a revision
((string-match "^[0-9]+\\.[0-9]+\\(\\.[0-9]+\\.[0-9]+\\)*$"
default-branch)
- (setq workfile-version default-branch))
+ (setq working-revision default-branch))
;; else, search for the head of the default branch
(t (vc-insert-file (vc-name file) "^desc")
- (setq workfile-version
+ (setq working-revision
(vc-rcs-find-most-recent-rev default-branch))
(setq workfile-is-latest t)))
- (vc-file-setprop file 'vc-workfile-version workfile-version))
+ (vc-file-setprop file 'vc-working-revision working-revision))
;; Check strict locking
(goto-char (point-min))
(vc-file-setprop file 'vc-checkout-model
(goto-char (point-min))
(let ((locking-user
(vc-parse-buffer (concat "^locks[ \t\n]+[^;]*[ \t\n]+\\([^:]+\\):"
- (regexp-quote workfile-version)
+ (regexp-quote working-revision)
"[^0-9.]")
1)))
(cond
;; not locked
((not locking-user)
(if (or workfile-is-latest
- (vc-rcs-latest-on-branch-p file workfile-version))
+ (vc-rcs-latest-on-branch-p file working-revision))
;; workfile version is latest on branch
'up-to-date
;; workfile version is not latest on branch
- 'needs-patch))
+ 'needs-update))
;; locked by the calling user
((and (stringp locking-user)
- (string= locking-user (vc-user-login-name)))
- (if (or (eq (vc-checkout-model file) 'locking)
+ (string= locking-user (vc-user-login-name file)))
+ ;; Don't call `vc-rcs-checkout-model' to avoid inf-looping.
+ (if (or (eq (vc-file-getprop file 'vc-checkout-model) 'locking)
workfile-is-latest
- (vc-rcs-latest-on-branch-p file workfile-version))
+ (vc-rcs-latest-on-branch-p file working-revision))
'edited
;; Locking is not used for the file, but the owner does
;; have a lock, and there is a higher version on the current
;; else: nothing found
;; -------------------
(t nil)))
- (if status (vc-file-setprop file 'vc-workfile-version version))
+ (if status (vc-file-setprop file 'vc-working-revision version))
(and (eq status 'rev-and-lock)
(vc-file-setprop file 'vc-state
(cond
((eq locking-user 'none) 'up-to-date)
- ((string= locking-user (vc-user-login-name)) 'edited)
+ ((string= locking-user (vc-user-login-name file))
+ 'edited)
(t locking-user)))
;; If the file has headers, we don't want to query the
;; master file, because that would eliminate all the
(not (eq installation 'unknown)))
(vc-release-greater-or-equal installation release))))
-
(defun vc-rcs-system-release ()
"Return the RCS release installed on this system, as a string.
-Return symbol UNKNOWN if the release cannot be deducted. The user can
+Return symbol `unknown' if the release cannot be deducted. The user can
override this using variable `vc-rcs-release'.
If the user has not set variable `vc-rcs-release' and it is nil,
variable `vc-rcs-release' is set to the returned value."
(or vc-rcs-release
(setq vc-rcs-release
- (or (and (zerop (vc-do-command nil nil "rcs" nil "-V"))
+ (or (and (zerop (vc-do-command "*vc*" nil "rcs" nil "-V"))
(with-current-buffer (get-buffer "*vc*")
(vc-parse-buffer "^RCS version \\([0-9.]+ *.*\\)" 1)))
'unknown))))
(defun vc-rcs-set-non-strict-locking (file)
- (vc-do-command nil 0 "rcs" file "-U")
+ (vc-do-command "*vc*" 0 "rcs" file "-U")
(vc-file-setprop file 'vc-checkout-model 'implicit)
(set-file-modes file (logior (file-modes file) 128)))
(defun vc-rcs-set-default-branch (file branch)
- (vc-do-command nil 0 "rcs" (vc-name file) (concat "-b" branch))
+ (vc-do-command "*vc*" 0 "rcs" (vc-name file) (concat "-b" branch))
(vc-file-setprop file 'vc-rcs-default-branch branch))
+(defun vc-rcs-parse (&optional buffer)
+ "Parse current buffer, presumed to be in RCS-style masterfile format.
+Optional arg BUFFER specifies another buffer to parse. Return an alist
+of two elements, w/ keys `headers' and `revisions' and values in turn
+sub-alists. For `headers', the values unless otherwise specified are
+strings and the keys are:
+
+ desc -- description
+ head -- latest revision
+ branch -- the branch the \"head revision\" lies on;
+ absent if the head revision lies on the trunk
+ access -- ???
+ symbols -- sub-alist of (SYMBOL . REVISION) elements
+ locks -- if file is checked out, something like \"ttn:1.7\"
+ strict -- t if \"strict locking\" is in effect, otherwise nil
+ comment -- may be absent; typically something like \"# \" or \"; \"
+ expand -- may be absent; ???
+
+For `revisions', the car is REVISION (string), the cdr a sub-alist,
+with string values (unless otherwise specified) and keys:
+
+ date -- a time value (like that returned by `encode-time'); as a
+ special case, a year value less than 100 is augmented by 1900
+ author -- username
+ state -- typically \"Exp\" or \"Rel\"
+ branches -- list of revisions that begin branches from this revision
+ next -- on the trunk: the chronologically-preceding revision, or \"\";
+ on a branch: the chronologically-following revision, or \"\"
+ log -- change log entry
+ text -- for the head revision on the trunk, the body of the file;
+ other revisions have `:insn' instead
+ :insn -- for non-head revisions, a list of parsed instructions
+ in one of two forms, in both cases START meaning \"first
+ go to line START\":
+ - `(START k COUNT)' -- kill COUNT lines
+ - `(START i TEXT)' -- insert TEXT (a string)
+ The list is in descending order by START.
+
+The `:insn' key is a keyword to distinguish it as a vc-rcs.el extension."
+ (setq buffer (get-buffer (or buffer (current-buffer))))
+ (set-buffer buffer)
+ ;; An RCS masterfile can be viewed as containing four regular (for the
+ ;; most part) sections: (a) the "headers", (b) the "rev headers", (c)
+ ;; the "description" and (d) the "rev bodies", in that order. In the
+ ;; returned alist (see docstring), elements from (b) and (d) are
+ ;; combined pairwise to form the "revisions", while those from (a) and
+ ;; (c) are simply combined to form the "headers".
+ ;;
+ ;; Loosely speaking, each section contains a series of alternating
+ ;; "tags" and "printed representations". In the (b) and (d), many
+ ;; such series can appear, and a revision number on a line by itself
+ ;; precedes the series of tags and printed representations associated
+ ;; with it.
+ ;;
+ ;; In (a) and (b), the printed representations (with the exception of
+ ;; the `comment' tag in the headers) terminate with a semicolon, which
+ ;; is NOT part of the "value" finally associated with the tag. All
+ ;; other printed representations are in "@@-format"; there is an "@",
+ ;; the middle part (to be translated into the value), another "@" and
+ ;; a newline. Each "@@" in the middle part indicates the position of
+ ;; a single "@" (and consequently the requirement of an additional
+ ;; initial step when translating to the value).
+ ;;
+ ;; Parser state includes vars that collect parts of the return value...
+ (let ((desc nil) (headers nil) (revs nil)
+ ;; ... as well as vars that support a single-pass, tag-assisted,
+ ;; minimal-data-copying scan. Basically -- skirting around the
+ ;; grouping by revision required in (b) and (d) -- we repeatedly
+ ;; and context-sensitively read a tag (that MUST be present),
+ ;; determine the bounds of the printed representation, translate
+ ;; it into a value, and push the tag plus value onto one of the
+ ;; collection vars. Finally, we return the parse tree
+ ;; incorporating the values of the collection vars (see "rv").
+ ;;
+ ;; A symbol or string to keep track of context (for error messages).
+ context
+ ;; A symbol, the current tag.
+ tok
+ ;; Region (begin and end buffer positions) of the printed
+ ;; representation for the current tag.
+ b e
+ ;; A list of buffer positions where "@@" can be found within the
+ ;; printed representation region. For each location, we push two
+ ;; elements onto the list, 1+ and 2+ the location, respectively,
+ ;; with the 2+ appearing at the head. In this way, the expression
+ ;; `(,e ,@@-holes ,b)
+ ;; describes regions that can be concatenated (in reverse order)
+ ;; to "de-@@-format" the printed representation as the first step
+ ;; to translating it into some value. See internal func `gather'.
+ @-holes)
+ (flet ((sw () (skip-chars-forward " \t\n")) ; i.e., `[:space:]'
+ (at (tag) (save-excursion (eq tag (read buffer))))
+ (to-eol () (buffer-substring-no-properties
+ (point) (progn (forward-line 1)
+ (1- (point)))))
+ (to-semi () (setq b (point)
+ e (progn (search-forward ";")
+ (1- (point)))))
+ (to-one@ () (setq @-holes nil
+ b (progn (search-forward "@") (point))
+ e (progn (while (and (search-forward "@")
+ (= ?@ (char-after))
+ (progn
+ (push (point) @-holes)
+ (forward-char 1)
+ (push (point) @-holes))))
+ (1- (point)))))
+ (tok+val (set-b+e name &optional proc)
+ (unless (eq name (setq tok (read buffer)))
+ (error "Missing `%s' while parsing %s" name context))
+ (sw)
+ (funcall set-b+e)
+ (cons tok (if proc
+ (funcall proc)
+ (buffer-substring-no-properties b e))))
+ (k-semi (name &optional proc) (tok+val 'to-semi name proc))
+ (gather () (let ((pairs `(,e ,@@-holes ,b))
+ acc)
+ (while pairs
+ (push (buffer-substring-no-properties
+ (cadr pairs) (car pairs))
+ acc)
+ (setq pairs (cddr pairs)))
+ (apply 'concat acc)))
+ (k-one@ (name &optional later) (tok+val 'to-one@ name
+ (if later
+ (lambda () t)
+ 'gather))))
+ (save-excursion
+ (goto-char (point-min))
+ ;; headers
+ (setq context 'headers)
+ (flet ((hpush (name &optional proc)
+ (push (k-semi name proc) headers)))
+ (hpush 'head)
+ (when (at 'branch)
+ (hpush 'branch))
+ (hpush 'access)
+ (hpush 'symbols
+ (lambda ()
+ (mapcar (lambda (together)
+ (let ((two (split-string together ":")))
+ (setcar two (intern (car two)))
+ (setcdr two (cadr two))
+ two))
+ (split-string
+ (buffer-substring-no-properties b e)))))
+ (hpush 'locks))
+ (push `(strict . ,(when (at 'strict)
+ (search-forward ";")
+ t))
+ headers)
+ (when (at 'comment)
+ (push (k-one@ 'comment) headers)
+ (search-forward ";"))
+ (when (at 'expand)
+ (push (k-one@ 'expand) headers)
+ (search-forward ";"))
+ (setq headers (nreverse headers))
+ ;; rev headers
+ (sw) (setq context 'rev-headers)
+ (while (looking-at "[0-9]")
+ (push `(,(to-eol)
+ ,(k-semi 'date
+ (lambda ()
+ (let ((ls (mapcar 'string-to-number
+ (split-string
+ (buffer-substring-no-properties
+ b e)
+ "\\."))))
+ ;; Hack the year -- verified to be the
+ ;; same algorithm used in RCS 5.7.
+ (when (< (car ls) 100)
+ (setcar ls (+ 1900 (car ls))))
+ (apply 'encode-time (nreverse ls)))))
+ ,@(mapcar 'k-semi '(author state))
+ ,(k-semi 'branches
+ (lambda ()
+ (split-string
+ (buffer-substring-no-properties b e))))
+ ,(k-semi 'next))
+ revs)
+ (sw))
+ (setq revs (nreverse revs))
+ ;; desc
+ (sw) (setq context 'desc
+ desc (k-one@ 'desc))
+ ;; rev bodies
+ (let (acc
+ ;; Element of `revs' that initially holds only header info.
+ ;; "Pairwise combination" occurs when we add body info.
+ rev
+ ;; Components of the editing commands (aside from the actual
+ ;; text) that comprise the `text' printed representations
+ ;; (not including the "head" revision).
+ cmd start act
+ ;; Ascending (reversed) `@-holes' which the internal func
+ ;; `incg' pops to effect incremental gathering.
+ asc
+ ;; Function to extract text (for the `a' command), either
+ ;; `incg' or `buffer-substring-no-properties'. (This is
+ ;; for speed; strictly speaking, it is sufficient to use
+ ;; only the former since it behaves identically to the
+ ;; latter in the absense of "@@".)
+ sub)
+ (flet ((incg (beg end) (let ((b beg) (e end) @-holes)
+ (while (and asc (< (car asc) e))
+ (push (pop asc) @-holes))
+ ;; Self-deprecate when work is done.
+ ;; Folding many dimensions into one.
+ ;; Thanks B.Mandelbrot, for complex sum.
+ ;; O beauteous math! --the Unvexed Bum
+ (unless asc
+ (setq sub 'buffer-substring-no-properties))
+ (gather))))
+ (while (and (sw)
+ (not (eobp))
+ (setq context (to-eol)
+ rev (or (assoc context revs)
+ (error "Rev `%s' has body but no head"
+ context))))
+ (push (k-one@ 'log) (cdr rev))
+ ;; For rev body `text' tags, delay translation slightly...
+ (push (k-one@ 'text t) (cdr rev))
+ ;; ... until we decide which tag and value is appropriate to
+ ;; collect. For the "head" revision, compute the value of the
+ ;; `text' printed representation by simple `gather'. For all
+ ;; other revisions, replace the `text' tag+value with `:insn'
+ ;; plus value, always scanning in-place.
+ (if (string= context (cdr (assq 'head headers)))
+ (setcdr (cadr rev) (gather))
+ (if @-holes
+ (setq asc (nreverse @-holes)
+ sub 'incg)
+ (setq sub 'buffer-substring-no-properties))
+ (goto-char b)
+ (setq acc nil)
+ (while (< (point) e)
+ (forward-char 1)
+ (setq cmd (char-before)
+ start (read (current-buffer))
+ act (read (current-buffer)))
+ (forward-char 1)
+ (push (case cmd
+ (?d
+ ;; `d' means "delete lines".
+ ;; For Emacs spirit, we use `k' for "kill".
+ `(,start k ,act))
+ (?a
+ ;; `a' means "append after this line" but
+ ;; internally we normalize it so that START
+ ;; specifies the actual line for insert, thus
+ ;; requiring less hair in the realization algs.
+ ;; For Emacs spirit, we use `i' for "insert".
+ `(,(1+ start) i
+ ,(funcall sub (point) (progn (forward-line act)
+ (point)))))
+ (t (error "Bad command `%c' in `text' for rev `%s'"
+ cmd context)))
+ acc))
+ (goto-char (1+ e))
+ (setcar (cdr rev) (cons :insn acc)))))))
+ ;; rv
+ `((headers ,desc ,@headers)
+ (revisions ,@revs)))))
+
(provide 'vc-rcs)
-;;; arch-tag: 759b4916-5b0d-431d-b647-b185b8c652cf
+;; arch-tag: 759b4916-5b0d-431d-b647-b185b8c652cf
;;; vc-rcs.el ends here