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Diffstat (limited to 'lisp/vc/vc-rcs.el')
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diff --git a/lisp/vc/vc-rcs.el b/lisp/vc/vc-rcs.el new file mode 100644 index 00000000000..ea0fed7bf0d --- /dev/null +++ b/lisp/vc/vc-rcs.el @@ -0,0 +1,1471 @@ +;;; vc-rcs.el --- support for RCS version-control + +;; Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, +;; 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 +;; Free Software Foundation, Inc. + +;; Author: FSF (see vc.el for full credits) +;; Maintainer: Andre Spiegel <spiegel@gnu.org> +;; Package: vc + +;; This file is part of GNU Emacs. + +;; 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 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 +;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;; GNU General Public License for more details. + +;; You should have received a copy of the GNU General Public License +;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. + +;;; Commentary: + +;; See vc.el + +;; Some features will not work with old RCS versions. Where +;; appropriate, VC finds out which version you have, and allows or +;; disallows those features (stealing locks, for example, works only +;; from 5.6.2 onwards). +;; Even initial checkins will fail if your RCS version is so old that ci +;; doesn't understand -t-; this has been known to happen to people running +;; NExTSTEP 3.0. +;; +;; You can support the RCS -x option by customizing vc-rcs-master-templates. + +;;; Code: + +;;; +;;; Customization options +;;; + +(eval-when-compile + (require 'cl) + (require 'vc)) + +(defcustom vc-rcs-release nil + "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") + (const :tag "Unknown" unknown)) + :group 'vc) + +(defcustom vc-rcs-register-switches 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)) + :version "21.1" + :group 'vc) + +(defcustom vc-rcs-diff-switches 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)) + :version "21.1" + :group 'vc) + +(defcustom vc-rcs-header '("\$Id\$") + "Header keywords to be inserted by `vc-insert-headers'." + :type '(repeat string) + :version "24.1" ; no longer consult the obsolete vc-header-alist + :group 'vc) + +(defcustom vc-rcsdiff-knows-brief nil + "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)) + :group 'vc) + +;;;###autoload +(defcustom vc-rcs-master-templates + (purecopy '("%sRCS/%s,v" "%s%s,v" "%sRCS/%s")) + "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")) + (repeat :tag "User-specified" + (choice string + function))) + :version "21.1" + :group 'vc) + + +;;; 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. +;;;###autoload +(progn +(defun vc-rcs-registered (f) (vc-default-registered 'RCS f))) + +(defun vc-rcs-state (file) + "Implementation of `vc-state' for RCS." + (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." + (let (vc-rcs-headers-result) + (if (and vc-consult-headers + (setq vc-rcs-headers-result + (vc-rcs-consult-headers file)) + (eq vc-rcs-headers-result 'rev-and-lock)) + (let ((state (vc-file-getprop file 'vc-state))) + ;; If the headers say that the file is not locked, the + ;; 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)) + (file-exists-p file)) + (cond + ((string-match ".rw..-..-." (nth 8 (file-attributes file))) + (vc-file-setprop file 'vc-checkout-model 'implicit) + (setq state + (if (vc-rcs-workfile-is-newer file) + 'edited + 'up-to-date))) + ((string-match ".r-..-..-." (nth 8 (file-attributes file))) + (vc-file-setprop file 'vc-checkout-model 'locking)))) + state) + (if (not (vc-mistrust-permissions file)) + (let* ((attributes (file-attributes file 'string)) + (owner-name (nth 2 attributes)) + (permissions (nth 8 attributes))) + (cond ((and permissions (string-match ".r-..-..-." permissions)) + (vc-file-setprop file 'vc-checkout-model 'locking) + 'up-to-date) + ((and permissions (string-match ".rw..-..-." permissions)) + (if (eq (vc-rcs-checkout-model file) 'locking) + (if (file-ownership-preserved-p file) + 'edited + owner-name) + (if (vc-rcs-workfile-is-newer file) + 'edited + 'up-to-date))) + (t + ;; Strange permissions. Fall through to + ;; expensive state computation. + (vc-rcs-state file)))) + (vc-rcs-state file))))) + +(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-working-revision)) + (progn + (vc-rcs-fetch-master-state file) + (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-working-revision file))) + (with-temp-buffer + (string= version + (if (vc-rcs-trunk-p version) + (progn + ;; Compare VERSION to the head version number. + (vc-insert-file (vc-name file) "^[0-9]") + (vc-parse-buffer "^head[ \t\n]+\\([^;]+\\);" 1)) + ;; If we are not on the trunk, we need to examine the + ;; whole current branch. + (vc-insert-file (vc-name file) "^desc") + (vc-rcs-find-most-recent-rev (vc-branch-part version)))))) + +(defun vc-rcs-workfile-unchanged-p (file) + "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-working-revision file))) + (status (if (eq vc-rcsdiff-knows-brief 'no) + (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 "*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))) + + +;;; +;;; State-changing functions +;;; + +(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")) + +(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 name) + ;; When REV is specified, we need to force using "-t-". + (when rev (unless comment (setq comment ""))) + (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 "*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) + (and comment (concat "-t-" comment)) + (vc-switches 'RCS 'register)) + ;; parse output to find master file name and workfile version + (with-current-buffer "*vc*" + (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." + ;; TODO: check for all the patterns in vc-rcs-master-templates + (file-directory-p (expand-file-name "RCS" (file-name-directory file)))) + +(defun vc-rcs-receive-file (file rev) + "Implementation of receive-file for RCS." + (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)) + (vc-rcs-set-default-branch file (concat rev ".1")))) + +(defun vc-rcs-unregister (file) + "Unregister FILE from RCS. +If this leaves the RCS subdirectory empty, ask the user +whether to remove it." + (let* ((master (vc-name file)) + (dir (file-name-directory master)) + (backup-info (find-backup-file-name master))) + (if (not backup-info) + (delete-file master) + (rename-file master (car backup-info) 'ok-if-already-exists) + (dolist (f (cdr backup-info)) (ignore-errors (delete-file f)))) + (and (string= (file-name-nondirectory (directory-file-name dir)) "RCS") + ;; check whether RCS dir is empty, i.e. it does not + ;; contain any files except "." and ".." + (not (directory-files dir nil + "^\\([^.]\\|\\.[^.]\\|\\.\\.[^.]\\).*")) + (yes-or-no-p (format "Directory %s is empty; remove it? " dir)) + (delete-directory dir)))) + +(defun vc-rcs-checkin (files rev comment) + "RCS-specific version of `vc-backend-checkin'." + (let ((switches (vc-switches 'RCS 'checkin))) + ;; 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-rcs-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 + (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. 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-rcs-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) + ;; determine the new workfile version + (with-current-buffer "*vc*" + (setq new-version + (vc-parse-buffer "^revision \\([0-9.]+\\).*\n" 1))) + (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 + file + (if (vc-rcs-latest-on-branch-p file new-version) + (if (vc-rcs-trunk-p new-version) nil + (vc-branch-part new-version)) + new-version))))) + (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-rcs-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. 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 "*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." + (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)))) + + +;;; +;;; History functions +;;; + +(defun vc-rcs-print-log-cleanup () + (let ((inhibit-read-only t)) + (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)) + (when (looking-at "[\b\t\n\v\f\r ]+") + (delete-char (- (match-end 0) (match-beginning 0)))))) + +(defun vc-rcs-print-log (files buffer &optional shortlog start-revision-ignored limit) + "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))) + (with-current-buffer (or buffer "*vc*") + (vc-rcs-print-log-cleanup)) + (when limit 'limit-unsupported)) + +(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" + (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-char (point-min)) + (forward-line (1- (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-char (point-min)) + (forward-line (1- (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)) + + +;;; +;;; Tag system +;;; + +(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 ":"))))))) + + +;;; +;;; Miscellaneous +;;; + +(defun vc-rcs-trunk-p (rev) + "Return t if REV is a revision on the trunk." + (not (eq nil (string-match "\\`[0-9]+\\.[0-9]+\\'" rev)))) + +(defun vc-rcs-minor-part (rev) + "Return the minor revision number of a revision number REV." + (string-match "[0-9]+\\'" rev) + (substring rev (match-beginning 0) (match-end 0))) + +(defun vc-rcs-previous-revision (file rev) + "Return the revision number immediately preceding REV for FILE, +or nil if there is no previous revision. This default +implementation works for MAJOR.MINOR-style revision numbers as +used by RCS and CVS." + (let ((branch (vc-branch-part rev)) + (minor-num (string-to-number (vc-rcs-minor-part rev)))) + (when branch + (if (> minor-num 1) + ;; revision does probably not start a branch or release + (concat branch "." (number-to-string (1- minor-num))) + (if (vc-rcs-trunk-p rev) + ;; we are at the beginning of the trunk -- + ;; don't know anything to return here + nil + ;; we are at the beginning of a branch -- + ;; return revision of starting point + (vc-branch-part branch)))))) + +(defun vc-rcs-next-revision (file rev) + "Return the revision number immediately following REV for FILE, +or nil if there is no next revision. This default implementation +works for MAJOR.MINOR-style revision numbers as used by RCS +and CVS." + (when (not (string= rev (vc-working-revision file))) + (let ((branch (vc-branch-part rev)) + (minor-num (string-to-number (vc-rcs-minor-part rev)))) + (concat branch "." (number-to-string (1+ minor-num)))))) + +(defun vc-rcs-update-changelog (files) + "Default implementation of update-changelog. +Uses `rcs2log' which only works for RCS and CVS." + ;; FIXME: We (c|sh)ould add support for cvs2cl + (let ((odefault default-directory) + (changelog (find-change-log)) + ;; Presumably not portable to non-Unixy systems, along with rcs2log: + (tempfile (make-temp-file + (expand-file-name "vc" + (or small-temporary-file-directory + temporary-file-directory)))) + (login-name (or user-login-name + (format "uid%d" (number-to-string (user-uid))))) + (full-name (or add-log-full-name + (user-full-name) + (user-login-name) + (format "uid%d" (number-to-string (user-uid))))) + (mailing-address (or add-log-mailing-address + user-mail-address))) + (find-file-other-window changelog) + (barf-if-buffer-read-only) + (vc-buffer-sync) + (undo-boundary) + (goto-char (point-min)) + (push-mark) + (message "Computing change log entries...") + (message "Computing change log entries... %s" + (unwind-protect + (progn + (setq default-directory odefault) + (if (eq 0 (apply 'call-process + (expand-file-name "rcs2log" + exec-directory) + nil (list t tempfile) nil + "-c" changelog + "-u" (concat login-name + "\t" full-name + "\t" mailing-address) + (mapcar + (lambda (f) + (file-relative-name + (expand-file-name f odefault))) + files))) + "done" + (pop-to-buffer (get-buffer-create "*vc*")) + (erase-buffer) + (insert-file-contents tempfile) + "failed")) + (setq default-directory (file-name-directory changelog)) + (delete-file tempfile))))) + +(defun vc-rcs-check-headers () + "Check if the current file has any headers in it." + (save-excursion + (goto-char (point-min)) + (re-search-forward "\\$[A-Za-z\300-\326\330-\366\370-\377]+\ +\\(: [\t -#%-\176\240-\377]*\\)?\\$" nil t))) + +(defun vc-rcs-clear-headers () + "Implementation of vc-clear-headers for RCS." + (let ((case-fold-search nil)) + (goto-char (point-min)) + (while (re-search-forward + (concat "\\$\\(Author\\|Date\\|Header\\|Id\\|Locker\\|Name\\|" + "RCSfile\\|Revision\\|Source\\|State\\): [^$\n]+\\$") + nil t) + (replace-match "$\\1$")))) + +(defun vc-rcs-rename-file (old new) + ;; Just move the master file (using vc-rcs-master-templates). + (vc-rename-master (vc-name old) new vc-rcs-master-templates)) + +(defun vc-rcs-find-file-hook () + ;; If the file is locked by some other user, make + ;; the buffer read-only. Like this, even root + ;; cannot modify a file that someone else has locked. + (and (stringp (vc-state buffer-file-name 'RCS)) + (setq buffer-read-only t))) + + +;;; +;;; Internal functions +;;; + +(defun vc-rcs-workfile-is-newer (file) + "Return non-nil if FILE is newer than its RCS master. +This likely means that FILE has been changed with respect +to its master version." + (let ((file-time (nth 5 (file-attributes file))) + (master-time (nth 5 (file-attributes (vc-name file))))) + (or (> (nth 0 file-time) (nth 0 master-time)) + (and (= (nth 0 file-time) (nth 0 master-time)) + (> (nth 1 file-time) (nth 1 master-time)))))) + +(defun vc-rcs-find-most-recent-rev (branch) + "Find most recent revision on BRANCH." + (goto-char (point-min)) + (let ((latest-rev -1) value) + (while (re-search-forward (concat "^\\(" (regexp-quote branch) + "\\.\\([0-9]+\\)\\)\ndate[ \t]+[0-9.]+;") + nil t) + (let ((rev (string-to-number (match-string 2)))) + (when (< latest-rev rev) + (setq latest-rev rev) + (setq value (match-string 1))))) + (or value + (vc-branch-part branch)))) + +(defun vc-rcs-fetch-master-state (file &optional working-revision) + "Compute the master file's idea of the state of FILE. +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-working-revision' and +`vc-checkout-model' to their correct values, based on the master +file." + (with-temp-buffer + (if (or (not (vc-insert-file (vc-name file) "^[0-9]")) + (progn (goto-char (point-min)) + (not (looking-at "^head[ \t\n]+[^;]+;$")))) + (error "File %s is not an RCS master file" (vc-name file))) + (let ((workfile-is-latest nil) + (default-branch (vc-parse-buffer "^branch[ \t\n]+\\([^;]*\\);" 1))) + (vc-file-setprop file 'vc-rcs-default-branch default-branch) + (unless working-revision + ;; Workfile version not known yet. Determine that first. It + ;; is either the head of the trunk, the head of the default + ;; branch, or the "default branch" itself, if that is a full + ;; revision number. + (cond + ;; no default branch + ((or (not default-branch) (string= "" default-branch)) + (setq working-revision + (vc-parse-buffer "^head[ \t\n]+\\([^;]+\\);" 1)) + (setq workfile-is-latest t)) + ;; default branch is actually a revision + ((string-match "^[0-9]+\\.[0-9]+\\(\\.[0-9]+\\.[0-9]+\\)*$" + default-branch) + (setq working-revision default-branch)) + ;; else, search for the head of the default branch + (t (vc-insert-file (vc-name file) "^desc") + (setq working-revision + (vc-rcs-find-most-recent-rev default-branch)) + (setq workfile-is-latest t))) + (vc-file-setprop file 'vc-working-revision working-revision)) + ;; Check strict locking + (goto-char (point-min)) + (vc-file-setprop file 'vc-checkout-model + (if (re-search-forward ";[ \t\n]*strict;" nil t) + 'locking 'implicit)) + ;; Compute state of workfile version + (goto-char (point-min)) + (let ((locking-user + (vc-parse-buffer (concat "^locks[ \t\n]+[^;]*[ \t\n]+\\([^:]+\\):" + (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 working-revision)) + ;; workfile version is latest on branch + 'up-to-date + ;; workfile version is not latest on branch + 'needs-update)) + ;; locked by the calling user + ((and (stringp locking-user) + (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 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 + ;; branch. Not sure if this can occur, and if it is right + ;; to use `needs-merge' in this case. + 'needs-merge)) + ;; locked by somebody else + ((stringp locking-user) + locking-user) + (t + (error "Error getting state of RCS file"))))))) + +(defun vc-rcs-consult-headers (file) + "Search for RCS headers in FILE, and set properties accordingly. + +Returns: nil if no headers were found + 'rev if a workfile revision was found + 'rev-and-lock if revision and lock info was found" + (cond + ((not (get-file-buffer file)) nil) + ((let (status version locking-user) + (with-current-buffer (get-file-buffer file) + (save-excursion + (goto-char (point-min)) + (cond + ;; search for $Id or $Header + ;; ------------------------- + ;; The `\ 's below avoid an RCS 5.7 bug when checking in this file. + ((or (and (search-forward "$Id\ : " nil t) + (looking-at "[^ ]+ \\([0-9.]+\\) ")) + (and (progn (goto-char (point-min)) + (search-forward "$Header\ : " nil t)) + (looking-at "[^ ]+ \\([0-9.]+\\) "))) + (goto-char (match-end 0)) + ;; if found, store the revision number ... + (setq version (match-string-no-properties 1)) + ;; ... and check for the locking state + (cond + ((looking-at + (concat "[0-9]+[/-][01][0-9][/-][0-3][0-9] " ; date + "[0-2][0-9]:[0-5][0-9]+:[0-6][0-9]+\\([+-][0-9:]+\\)? " ; time + "[^ ]+ [^ ]+ ")) ; author & state + (goto-char (match-end 0)) ; [0-6] in regexp handles leap seconds + (cond + ;; unlocked revision + ((looking-at "\\$") + (setq locking-user 'none) + (setq status 'rev-and-lock)) + ;; revision is locked by some user + ((looking-at "\\([^ ]+\\) \\$") + (setq locking-user (match-string-no-properties 1)) + (setq status 'rev-and-lock)) + ;; everything else: false + (nil))) + ;; unexpected information in + ;; keyword string --> quit + (nil))) + ;; search for $Revision + ;; -------------------- + ((re-search-forward (concat "\\$" + "Revision: \\([0-9.]+\\) \\$") + nil t) + ;; if found, store the revision number ... + (setq version (match-string-no-properties 1)) + ;; and see if there's any lock information + (goto-char (point-min)) + (if (re-search-forward (concat "\\$" "Locker:") nil t) + (cond ((looking-at " \\([^ ]+\\) \\$") + (setq locking-user (match-string-no-properties 1)) + (setq status 'rev-and-lock)) + ((looking-at " *\\$") + (setq locking-user 'none) + (setq status 'rev-and-lock)) + (t + (setq locking-user 'none) + (setq status 'rev-and-lock))) + (setq status 'rev))) + ;; else: nothing found + ;; ------------------- + (t nil)))) + (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 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 + ;; performance gain the headers brought us. We therefore + ;; use a heuristic now to find out whether locking is used + ;; for this file. If we trust the file permissions, and the + ;; file is not locked, then if the file is read-only we + ;; assume that locking is used for the file, otherwise + ;; locking is not used. + (not (vc-mistrust-permissions file)) + (vc-up-to-date-p file) + (if (string-match ".r-..-..-." (nth 8 (file-attributes file))) + (vc-file-setprop file 'vc-checkout-model 'locking) + (vc-file-setprop file 'vc-checkout-model 'implicit))) + status)))) + +(defun vc-release-greater-or-equal (r1 r2) + "Compare release numbers, represented as strings. +Release components are assumed cardinal numbers, not decimal fractions +\(5.10 is a higher release than 5.9\). Omitted fields are considered +lower \(5.6.7 is earlier than 5.6.7.1\). Comparison runs till the end +of the string is found, or a non-numeric component shows up \(5.6.7 is +earlier than \"5.6.7 beta\", which is probably not what you want in +some cases\). This code is suitable for existing RCS release numbers. +CVS releases are handled reasonably, too \(1.3 < 1.4* < 1.5\)." + (let (v1 v2 i1 i2) + (catch 'done + (or (and (string-match "^\\.?\\([0-9]+\\)" r1) + (setq i1 (match-end 0)) + (setq v1 (string-to-number (match-string 1 r1))) + (or (and (string-match "^\\.?\\([0-9]+\\)" r2) + (setq i2 (match-end 0)) + (setq v2 (string-to-number (match-string 1 r2))) + (if (> v1 v2) (throw 'done t) + (if (< v1 v2) (throw 'done nil) + (throw 'done + (vc-release-greater-or-equal + (substring r1 i1) + (substring r2 i2))))))) + (throw 'done t))) + (or (and (string-match "^\\.?\\([0-9]+\\)" r2) + (throw 'done nil)) + (throw 'done t))))) + +(defun vc-rcs-release-p (release) + "Return t if we have RELEASE or better." + (let ((installation (vc-rcs-system-release))) + (if (and installation + (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 +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 "*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 "*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 "*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 +;;; vc-rcs.el ends here |