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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:
+
+;; - 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 i does not work.
+;; - VC-dired does not work.
+;; - And more...
+
+;;; Code:
+
+(eval-when-compile (require 'vc))
+
+;;;
+;;; 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-tag ()
+  "Add an `arch-tag' to the end of the current file."
+  (interactive)
+  (goto-char (point-max))
+  (forward-comment -1)
+  (unless (bolp) (insert "\n"))
+  (let ((beg (point)))
+    (insert "arch-tag: ")
+    (call-process "uuidgen" nil t)      ;Also inserts a terminal newline.
+    (comment-region beg (point))))
+
+(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)))
+           (if (file-directory-p (expand-file-name "{arch}" file))
+               (setq root file)
+             (setq file (directory-file-name file))))
+         root))))
+
+(defun vc-arch-registered (file)
+  ;; Don't 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.
+  (vc-arch-root 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-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'.
+  '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))
+             (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))
+        (dolist (file (directory-files logdir))
+          (if (and (string-match "-\\([0-9]+\\)\\'" file)
+                   (setq tmp (string-to-number (match-string 1 file)))
+                   (>= tmp rev-nb))
+              (setq rev-nb tmp rev file)))
+        (concat defbranch "--" rev)))))
+
+
+(defcustom vc-arch-mode-line-rewrite
+  '(("\\`.*--\\(.*--.*\\)--.*-\\([0-9]+\\)\\'" . "\\2[\\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"
+            (if (memq (vc-state file) '(up-to-date needs-patch)) ?- ?:)
+            rev)))
+
+(defun vc-arch-diff3-rej-p (rej)
+  (and (eq (nth 7 (file-attributes rej)) 56)
+       (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 `write-file-functions'."
+  (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)))))
+  ;; This did not save the buffer.
+  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 'write-file-functions
+                        '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-checkout-model (file) 'implicit)
+
+(defun vc-arch-checkin (file rev comment)
+  (if rev (error "Committing to a specific revision is unsupported."))
+  (vc-arch-command nil 0 file "commit" "-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 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)))
+
+(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))
+
+(provide 'vc-arch)
+
+;;; arch-tag: a35c7c1c-5237-429d-88ef-3d718fd2e704
+;;; vc-arch.el ends here