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+;;; vc-arch.el --- VC backend for the Arch version-control system
+
+;; Copyright (C) 1995,98,99,2000,01,02,03,2004 Free Software Foundation, Inc.
+
+;; Author: FSF (see vc.el for full credits)
+;; Maintainer: Stefan Monnier <monnier@gnu.org>
+
+;; 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 2, 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; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; The home page of the Arch version control system is at
+;;
+;; http://www.gnuarch.org/
+;;
+;; This is derived from vc-mcvs.el as follows:
+;; - cp vc-mcvs.el vc-arch.el and then M-% mcvs RET arch RET
+;;
+;; Then of course started the hacking.
+;;
+;; What has been partly tested:
+;; - Open a file.
+;; - C-x v = without any prefix arg.
+;; - C-x v v to commit a change to a single file.
+
+;; Bugs:
+
+;; - *VC-log*'s initial content lacks the `Summary:' lines.
+;; - All files under the tree are considered as "under Arch's control"
+;; without regards to =tagging-method and such.
+;; - Files are always considered as `edited'.
+;; - C-x v l does not work.
+;; - C-x v i does not work.
+;; - C-x v ~ does not work.
+;; - C-x v u does not work.
+;; - C-x v s does not work.
+;; - C-x v r does not work.
+;; - VC-dired does not work.
+;; - And more...
+
+;;; Code:
+
+(eval-when-compile (require 'vc) (require 'cl))
+
+;;;
+;;; Customization options
+;;;
+
+(defvar vc-arch-command
+ (let ((candidates '("tla")))
+ (while (and candidates (not (executable-find (car candidates))))
+ (setq candidates (cdr candidates)))
+ (or (car candidates) "tla")))
+
+;; Clear up the cache to force vc-call to check again and discover
+;; new functions when we reload this file.
+(put 'Arch 'vc-functions nil)
+
+;;;###autoload (defun vc-arch-registered (file)
+;;;###autoload (let ((dir file))
+;;;###autoload (while (and (stringp dir)
+;;;###autoload (not (equal
+;;;###autoload dir (setq dir (file-name-directory dir))))
+;;;###autoload dir)
+;;;###autoload (setq dir (if (file-directory-p
+;;;###autoload (expand-file-name "{arch}" dir))
+;;;###autoload t (directory-file-name dir))))
+;;;###autoload (if (eq dir t)
+;;;###autoload (progn
+;;;###autoload (load "vc-arch")
+;;;###autoload (vc-arch-registered file)))))
+
+(defun vc-arch-add-tagline ()
+ "Add an `arch-tag' to the end of the current file."
+ (interactive)
+ (comment-normalize-vars)
+ (goto-char (point-max))
+ (forward-comment -1)
+ (unless (bolp) (insert "\n"))
+ (let ((beg (point))
+ (idfile (and buffer-file-name
+ (expand-file-name
+ (concat ".arch-ids/"
+ (file-name-nondirectory buffer-file-name)
+ ".id")
+ (file-name-directory buffer-file-name)))))
+ (insert "arch-tag: ")
+ (if (and idfile (file-exists-p idfile))
+ ;; If the file is unreadable, we do want to get an error here.
+ (progn
+ (insert-file-contents idfile)
+ (forward-line 1)
+ (delete-file idfile))
+ (condition-case nil
+ (call-process "uuidgen" nil t)
+ (file-error (insert (format "%s <%s> %s"
+ (current-time-string)
+ user-mail-address
+ (+ (nth 2 (current-time))
+ (buffer-size)))))))
+ (comment-region beg (point))))
+
+(defconst vc-arch-tagline-re "^\\W*arch-tag:[ \t]*\\(.*[^ \t\n]\\)")
+
+(defun vc-arch-file-source-p (file)
+ "Can return nil, `maybe' or a non-nil value.
+Only the value `maybe' can be trusted :-(."
+ ;; FIXME: Check the tag and name of parent dirs.
+ (unless (string-match "\\`[,+]" (file-name-nondirectory file))
+ (or (string-match "\\`{arch}/"
+ (file-relative-name file (vc-arch-root file)))
+ (file-exists-p
+ ;; Check the presence of an ID file.
+ (expand-file-name
+ (concat ".arch-ids/" (file-name-nondirectory file) ".id")
+ (file-name-directory file)))
+ ;; Check the presence of a tagline.
+ (with-current-buffer (find-file-noselect file)
+ (save-excursion
+ (goto-char (point-max))
+ (or (re-search-backward vc-arch-tagline-re (- (point) 1000) t)
+ (progn
+ (goto-char (point-min))
+ (re-search-forward vc-arch-tagline-re (+ (point) 1000) t)))))
+ ;; FIXME: check =tagging-method to see whether untagged files might
+ ;; be source or not.
+ (with-current-buffer
+ (find-file-noselect (expand-file-name "{arch}/=tagging-method"
+ (vc-arch-root file)))
+ (let ((untagged-source t)) ;Default is `names'.
+ (save-excursion
+ (goto-char (point-min))
+ (if (re-search-forward "^[ \t]*\\(\\(tagline\\|implicit\\|names\\)\\|explicit\\)" nil t)
+ (setq untagged-source (match-end 2)))
+ (if (re-search-forward "^[ \t]*untagged-source[ \t]+\\(\\(source\\)\\|precious\\|backup\\|junk\\|unrecognized\\)" nil t)
+ (setq untagged-source (match-end 2))))
+ (if untagged-source 'maybe))))))
+
+(defun vc-arch-file-id (file)
+ ;; Don't include the kind of ID this is because it seems to be too messy.
+ (let ((idfile (expand-file-name
+ (concat ".arch-ids/" (file-name-nondirectory file) ".id")
+ (file-name-directory file))))
+ (if (file-exists-p idfile)
+ (with-temp-buffer
+ (insert-file-contents idfile)
+ (looking-at ".*[^ \n\t]")
+ (match-string 0)))
+ (with-current-buffer (find-file-noselect file)
+ (save-excursion
+ (goto-char (point-max))
+ (if (or (re-search-backward vc-arch-tagline-re (- (point) 1000) t)
+ (progn
+ (goto-char (point-min))
+ (re-search-forward vc-arch-tagline-re (+ (point) 1000) t)))
+ (match-string 1)
+ (concat "./" (file-relative-name file (vc-arch-root file))))))))
+
+(defun vc-arch-tagging-method (file)
+ (with-current-buffer
+ (find-file-noselect
+ (expand-file-name "{arch}/=tagging-method" (vc-arch-root file)))
+ (save-excursion
+ (goto-char (point-min))
+ (if (re-search-forward
+ "^[ \t]*\\(tagline\\|implicit\\|names\\|explicit\\)" nil t)
+ (intern (match-string 1))
+ 'names))))
+
+(defun vc-arch-root (file)
+ "Return the root directory of a Arch project, if any."
+ (or (vc-file-getprop file 'arch-root)
+ (vc-file-setprop
+ file 'arch-root
+ (let ((root nil))
+ (while (not (or root
+ (equal file (setq file (file-name-directory file)))
+ (null file)))
+ ;; Check the =tagging-method, in case someone naively manually
+ ;; creates a {arch} directory somewhere.
+ (if (file-exists-p (expand-file-name "{arch}/=tagging-method" file))
+ (setq root file)
+ (setq file (directory-file-name file))))
+ root))))
+
+(defun vc-arch-register (file &optional rev comment)
+ (if rev (error "Explicit initial revision not supported for Arch"))
+ (let ((tagmet (vc-arch-tagging-method file)))
+ (if (and (memq tagmet '(tagline implicit)) comment-start)
+ (with-current-buffer (find-file-noselect file)
+ (if (buffer-modified-p)
+ (error "Save %s first" (buffer-name)))
+ (vc-arch-add-tagline)
+ (save-buffer))
+ (vc-arch-command nil 0 file "add"))))
+
+(defun vc-arch-registered (file)
+ ;; Don't seriously check whether it's source or not. Checking would
+ ;; require running TLA, so it's better to not do it, so it also works if
+ ;; TLA is not installed.
+ (and (vc-arch-root file)
+ (vc-arch-file-source-p file)))
+
+(defun vc-arch-default-version (file)
+ (or (vc-file-getprop (vc-arch-root file) 'arch-default-version)
+ (let* ((root (vc-arch-root file))
+ (f (expand-file-name "{arch}/++default-version" root)))
+ (if (file-readable-p f)
+ (vc-file-setprop
+ root 'arch-default-version
+ (with-temp-buffer
+ (insert-file-contents f)
+ ;; Strip the terminating newline.
+ (buffer-substring (point-min) (1- (point-max)))))))))
+
+(defun vc-arch-workfile-unchanged-p (file)
+ "Check if FILE is unchanged by diffing against the master version.
+Return non-nil if FILE is unchanged."
+ nil)
+
+(defun vc-arch-state (file)
+ ;; There's no checkout operation and merging is not done from VC
+ ;; so the only operation that's state dependent that VC supports is commit
+ ;; which is only activated if the file is `edited'.
+ (let* ((root (vc-arch-root file))
+ (ver (vc-arch-default-version file))
+ (pat (concat "\\`" (subst-char-in-string ?/ ?% ver)))
+ (dir (expand-file-name ",,inode-sigs/"
+ (expand-file-name "{arch}" root)))
+ (sigfile nil))
+ (dolist (f (if (file-directory-p dir) (directory-files dir t pat)))
+ (if (or (not sigfile) (file-newer-than-file-p f sigfile))
+ (setq sigfile f)))
+ (if (not sigfile)
+ 'edited ;We know nothing.
+ (let ((id (vc-arch-file-id file)))
+ (setq id (replace-regexp-in-string "[ \t]" "_" id))
+ (with-current-buffer (find-file-noselect sigfile)
+ (goto-char (point-min))
+ (while (and (search-forward id nil 'move)
+ (progn (goto-char (- (match-beginning 0) 2))
+ ;; Ignore E_ entries used for foo.id files.
+ (or (not (bolp)) (looking-at "E_")))))
+ (if (eobp)
+ ;; ID not found.
+ (if (equal (file-name-nondirectory sigfile)
+ (subst-char-in-string
+ ?/ ?% (vc-arch-workfile-version file)))
+ 'added
+ ;; Might be `added' or `up-to-date' as well.
+ ;; FIXME: Check in the patch logs to find out.
+ 'edited)
+ ;; Found the ID, let's check the inode.
+ (if (not (re-search-forward
+ "\t.*mtime=\\([0-9]+\\):size=\\([0-9]+\\)"
+ (line-end-position) t))
+ ;; Buh? Unexpected format.
+ 'edited
+ (let ((ats (file-attributes file)))
+ (if (and (= (nth 7 ats) (string-to-number (match-string 2)))
+ (equal (format-time-string "%s" (nth 5 ats))
+ (match-string 1)))
+ 'up-to-date
+ 'edited)))))))))
+
+(defun vc-arch-workfile-version (file)
+ (let* ((root (expand-file-name "{arch}" (vc-arch-root file)))
+ (defbranch (vc-arch-default-version file)))
+ (when (and defbranch (string-match "\\`\\(.+@[^/\n]+\\)/\\(\\(\\(.*\\)--.*\\)--.*\\)\\'" defbranch))
+ (let* ((archive (match-string 1 defbranch))
+ (category (match-string 4 defbranch))
+ (branch (match-string 3 defbranch))
+ (version (match-string 2 defbranch))
+ (sealed nil) (rev-nb 0)
+ (rev nil)
+ logdir tmp)
+ (setq logdir (expand-file-name category root))
+ (setq logdir (expand-file-name branch logdir))
+ (setq logdir (expand-file-name version logdir))
+ (setq logdir (expand-file-name archive logdir))
+ (setq logdir (expand-file-name "patch-log" logdir))
+ ;; Revision names go: base-0, patch-N, version-0, versionfix-N.
+ (dolist (file (directory-files logdir))
+ (when (and (eq (aref file 0) ?v) (not sealed))
+ (setq sealed t rev-nb 0))
+ (if (and (string-match "-\\([0-9]+\\)\\'" file)
+ (setq tmp (string-to-number (match-string 1 file)))
+ (or (not sealed) (eq (aref file 0) ?v))
+ (>= tmp rev-nb))
+ (setq rev-nb tmp rev file)))
+ (concat defbranch "--" rev)))))
+
+
+(defcustom vc-arch-mode-line-rewrite
+ '(("\\`.*--\\(.*--.*\\)--\\(v?\\).*-\\([0-9]+\\)\\'" . "\\2\\3[\\1]"))
+ "Rewrite rules to shorten Arch's revision names on the mode-line."
+ :type '(repeat (cons regexp string)))
+
+(defun vc-arch-mode-line-string (file)
+ "Return string for placement in modeline by `vc-mode-line' for FILE."
+ (let ((rev (vc-workfile-version file)))
+ (dolist (rule vc-arch-mode-line-rewrite)
+ (if (string-match (car rule) rev)
+ (setq rev (replace-match (cdr rule) t nil rev))))
+ (format "Arch%c%s"
+ (case (vc-state file)
+ ((up-to-date needs-patch) ?-)
+ (added ?@)
+ (t ?:))
+ rev)))
+
+(defun vc-arch-diff3-rej-p (rej)
+ (let ((attrs (file-attributes rej)))
+ (and attrs (< (nth 7 attrs) 60)
+ (with-temp-buffer
+ (insert-file-contents rej)
+ (goto-char (point-min))
+ (looking-at "Conflicts occured, diff3 conflict markers left in file\\.")))))
+
+(defun vc-arch-delete-rej-if-obsolete ()
+ "For use in `after-save-hook'."
+ (save-excursion
+ (let ((rej (concat buffer-file-name ".rej")))
+ (when (and buffer-file-name (vc-arch-diff3-rej-p rej))
+ (if (not (re-search-forward "^<<<<<<< " nil t))
+ ;; The .rej file is obsolete.
+ (condition-case nil (delete-file rej) (error nil)))))))
+
+(defun vc-arch-find-file-hook ()
+ (let ((rej (concat buffer-file-name ".rej")))
+ (when (and buffer-file-name (file-exists-p rej))
+ (if (vc-arch-diff3-rej-p rej)
+ (save-excursion
+ (goto-char (point-min))
+ (if (not (re-search-forward "^<<<<<<< " nil t))
+ ;; The .rej file is obsolete.
+ (condition-case nil (delete-file rej) (error nil))
+ (smerge-mode 1)
+ (add-hook 'after-save-hook
+ 'vc-arch-delete-rej-if-obsolete nil t)
+ (message "There are unresolved conflicts in this file")))
+ (message "There are unresolved conflicts in %s"
+ (file-name-nondirectory rej))))))
+
+(defun vc-arch-find-file-not-found-hook ()
+ ;; Do nothing. We are not sure whether the file is `source' or not,
+ ;; so we shouldn't ask the user whether she wants to check it out.
+ )
+
+(defun vc-arch-checkout-model (file) 'implicit)
+
+(defun vc-arch-checkin (file rev comment)
+ (if rev (error "Committing to a specific revision is unsupported."))
+ (let ((summary (file-relative-name file (vc-arch-root file))))
+ ;; Extract a summary from the comment.
+ (when (or (string-match "\\`Summary:[ \t]*\\(.*[^ \t\n]\\)\\([ \t]*\n\\)*" comment)
+ (string-match "\\`[ \t]*\\(.*[^ \t\n]\\)[ \t]*\\(\n?\\'\\|\n\\([ \t]*\n\\)+\\)" comment))
+ (setq summary (match-string 1 comment))
+ (setq comment (substring comment (match-end 0))))
+ (vc-arch-command nil 0 file "commit" "-s" summary "-L" comment "--"
+ (vc-switches 'Arch 'checkin))))
+
+(defun vc-arch-diff (file &optional oldvers newvers)
+ "Get a difference report using Arch between two versions of FILE."
+ (if (and newvers
+ (vc-up-to-date-p file)
+ (equal newvers (vc-workfile-version file)))
+ ;; Newvers is the base revision and the current file is unchanged,
+ ;; so we can diff with the current file.
+ (setq newvers nil))
+ (if newvers
+ (error "Diffing specific revisions not implemented.")
+ (let* ((async (fboundp 'start-process))
+ ;; Run the command from the root dir.
+ (default-directory (vc-arch-root file))
+ (status
+ (vc-arch-command
+ "*vc-diff*"
+ (if async 'async 1)
+ nil "file-diffs"
+ ;; Arch does not support the typical flags.
+ ;; (vc-switches 'Arch 'diff)
+ (file-relative-name file)
+ (if (equal oldvers (vc-workfile-version file))
+ nil
+ oldvers))))
+ (if async 1 status)))) ; async diff, pessimistic assumption.
+
+(defun vc-arch-delete-file (file)
+ (vc-arch-command nil 0 file "rm"))
+
+(defun vc-arch-rename-file (old new)
+ (vc-arch-command nil 0 new "mv" (file-relative-name old)))
+
+(defalias 'vc-arch-responsible-p 'vc-arch-root)
+
+(defun vc-arch-command (buffer okstatus file &rest flags)
+ "A wrapper around `vc-do-command' for use in vc-arch.el."
+ (apply 'vc-do-command buffer okstatus vc-arch-command file flags))
+
+(defun vc-arch-init-version () nil)
+
+(provide 'vc-arch)
+
+;;; arch-tag: a35c7c1c-5237-429d-88ef-3d718fd2e704
+;;; vc-arch.el ends here
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