lisp/vc-arch.el

   1 ;;; vc-arch.el --- VC backend for the Arch version-control system
   2
   3 ;; Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   4
   5 ;; Author:      FSF (see vc.el for full credits)
   6 ;; Maintainer:  Stefan Monnier <monnier@gnu.org>
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 3, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; The home page of the Arch version control system is at
  28 ;;
  29 ;;      http://www.gnuarch.org/
  30 ;;
  31 ;; This is derived from vc-mcvs.el as follows:
  32 ;; - cp vc-mcvs.el vc-arch.el and then M-% mcvs RET arch RET
  33 ;;
  34 ;; Then of course started the hacking.
  35 ;;
  36 ;; What has been partly tested:
  37 ;; - Open a file.
  38 ;; - C-x v =  without any prefix arg.
  39 ;; - C-x v v  to commit a change to a single file.
  40
  41 ;; Bugs:
  42
  43 ;; - *VC-log*'s initial content lacks the `Summary:' lines.
  44 ;; - All files under the tree are considered as "under Arch's control"
  45 ;;   without regards to =tagging-method and such.
  46 ;; - Files are always considered as `edited'.
  47 ;; - C-x v l does not work.
  48 ;; - C-x v i does not work.
  49 ;; - C-x v ~ does not work.
  50 ;; - C-x v u does not work.
  51 ;; - C-x v s does not work.
  52 ;; - C-x v r does not work.
  53 ;; - VC directory listings do not work.
  54 ;; - And more...
  55
  56 ;;; Code:
  57
  58 (eval-when-compile (require 'vc) (require 'cl))
  59
  60 ;;; Properties of the backend
  61
  62 (defun vc-arch-revision-granularity () 'repository)
  63 (defun vc-arch-checkout-model (files) 'implicit)
  64
  65 ;;;
  66 ;;; Customization options
  67 ;;;
  68
  69 (defvar vc-arch-command
  70   (let ((candidates '("tla" "baz")))
  71     (while (and candidates (not (executable-find (car candidates))))
  72       (setq candidates (cdr candidates)))
  73     (or (car candidates) "tla")))
  74
  75 ;; Clear up the cache to force vc-call to check again and discover
  76 ;; new functions when we reload this file.
  77 (put 'Arch 'vc-functions nil)
  78
  79 ;;;###autoload (defun vc-arch-registered (file)
  80 ;;;###autoload   (if (vc-find-root file "{arch}/=tagging-method")
  81 ;;;###autoload       (progn
  82 ;;;###autoload         (load "vc-arch")
  83 ;;;###autoload         (vc-arch-registered file))))
  84
  85 (defun vc-arch-add-tagline ()
  86   "Add an `arch-tag' to the end of the current file."
  87   (interactive)
  88   (comment-normalize-vars)
  89   (goto-char (point-max))
  90   (forward-comment -1)
  91   (skip-chars-forward " \t\n")
  92   (cond
  93    ((not (bolp)) (insert "\n\n"))
  94    ((not (eq ?\n (char-before (1- (point))))) (insert "\n")))
  95   (let ((beg (point))
  96         (idfile (and buffer-file-name
  97                      (expand-file-name
  98                       (concat ".arch-ids/"
  99                               (file-name-nondirectory buffer-file-name)
 100                               ".id")
 101                       (file-name-directory buffer-file-name)))))
 102     (insert "arch-tag: ")
 103     (if (and idfile (file-exists-p idfile))
 104         ;; If the file is unreadable, we do want to get an error here.
 105         (progn
 106           (insert-file-contents idfile)
 107           (forward-line 1)
 108           (delete-file idfile))
 109       (condition-case nil
 110           (call-process "uuidgen" nil t)
 111         (file-error (insert (format "%s <%s> %s"
 112                                     (current-time-string)
 113                                     user-mail-address
 114                                     (+ (nth 2 (current-time))
 115                                        (buffer-size)))))))
 116     (comment-region beg (point))))
 117
 118 (defconst vc-arch-tagline-re "^\\W*arch-tag:[ \t]*\\(.*[^ \t\n]\\)")
 119
 120 (defmacro vc-with-current-file-buffer (file &rest body)
 121   (declare (indent 2) (debug t))
 122   `(let ((-kill-buf- nil)
 123          (-file- ,file))
 124      (with-current-buffer (or (find-buffer-visiting -file-)
 125                               (setq -kill-buf- (generate-new-buffer " temp")))
 126        ;; Avoid find-file-literally since it can do many undesirable extra
 127        ;; things (among which, call us back into an infinite loop).
 128        (if -kill-buf- (insert-file-contents -file-))
 129        (unwind-protect
 130            (progn ,@body)
 131          (if (buffer-live-p -kill-buf-) (kill-buffer -kill-buf-))))))
 132
 133 (defun vc-arch-file-source-p (file)
 134   "Can return nil, `maybe' or a non-nil value.
 135 Only the value `maybe' can be trusted :-(."
 136   ;; FIXME: Check the tag and name of parent dirs.
 137   (unless (string-match "\\`[,+]" (file-name-nondirectory file))
 138     (or (string-match "\\`{arch}/"
 139                       (file-relative-name file (vc-arch-root file)))
 140         (file-exists-p
 141          ;; Check the presence of an ID file.
 142          (expand-file-name
 143           (concat ".arch-ids/" (file-name-nondirectory file) ".id")
 144           (file-name-directory file)))
 145         ;; Check the presence of a tagline.
 146         (vc-with-current-file-buffer file
 147           (save-excursion
 148             (goto-char (point-max))
 149             (or (re-search-backward vc-arch-tagline-re (- (point) 1000) t)
 150                 (progn
 151                   (goto-char (point-min))
 152                   (re-search-forward vc-arch-tagline-re (+ (point) 1000) t)))))
 153         ;; FIXME: check =tagging-method to see whether untagged files might
 154         ;; be source or not.
 155         (with-current-buffer
 156             (find-file-noselect (expand-file-name "{arch}/=tagging-method"
 157                                                   (vc-arch-root file)))
 158           (let ((untagged-source t))    ;Default is `names'.
 159             (save-excursion
 160               (goto-char (point-min))
 161               (if (re-search-forward "^[ \t]*\\(\\(tagline\\|implicit\\|names\\)\\|explicit\\)" nil t)
 162                   (setq untagged-source (match-end 2)))
 163               (if (re-search-forward "^[ \t]*untagged-source[ \t]+\\(\\(source\\)\\|precious\\|backup\\|junk\\|unrecognized\\)" nil t)
 164                   (setq untagged-source (match-end 2))))
 165             (if untagged-source 'maybe))))))
 166
 167 (defun vc-arch-file-id (file)
 168   ;; Don't include the kind of ID this is because it seems to be too messy.
 169   (let ((idfile (expand-file-name
 170                  (concat ".arch-ids/" (file-name-nondirectory file) ".id")
 171                  (file-name-directory file))))
 172     (if (file-exists-p idfile)
 173         (with-temp-buffer
 174           (insert-file-contents idfile)
 175           (looking-at ".*[^ \n\t]")
 176           (match-string 0))
 177       (with-current-buffer (find-file-noselect file)
 178         (save-excursion
 179           (goto-char (point-max))
 180           (if (or (re-search-backward vc-arch-tagline-re (- (point) 1000) t)
 181                   (progn
 182                     (goto-char (point-min))
 183                     (re-search-forward vc-arch-tagline-re (+ (point) 1000) t)))
 184               (match-string 1)
 185             (concat "./" (file-relative-name file (vc-arch-root file)))))))))
 186
 187 (defun vc-arch-tagging-method (file)
 188   (with-current-buffer
 189       (find-file-noselect
 190        (expand-file-name "{arch}/=tagging-method" (vc-arch-root file)))
 191     (save-excursion
 192       (goto-char (point-min))
 193       (if (re-search-forward
 194            "^[ \t]*\\(tagline\\|implicit\\|names\\|explicit\\)" nil t)
 195           (intern (match-string 1))
 196         'names))))
 197
 198 (defun vc-arch-root (file)
 199   "Return the root directory of a Arch project, if any."
 200   (or (vc-file-getprop file 'arch-root)
 201       ;; Check the =tagging-method, in case someone naively manually
 202       ;; creates a {arch} directory somewhere.
 203       (let ((root (vc-find-root file "{arch}/=tagging-method")))
 204         (when root
 205           (vc-file-setprop
 206            file 'arch-root root)))))
 207
 208 (defun vc-arch-register (files &optional rev comment)
 209   (if rev (error "Explicit initial revision not supported for Arch"))
 210   (dolist (file files)
 211     (let ((tagmet (vc-arch-tagging-method file)))
 212       (if (and (memq tagmet '(tagline implicit)) comment-start)
 213           (with-current-buffer (find-file-noselect file)
 214             (if (buffer-modified-p)
 215                 (error "Save %s first" (buffer-name)))
 216             (vc-arch-add-tagline)
 217             (save-buffer)))))
 218   (vc-arch-command nil 0 files "add"))
 219
 220 (defun vc-arch-registered (file)
 221   ;; Don't seriously check whether it's source or not.  Checking would
 222   ;; require running TLA, so it's better to not do it, so it also works if
 223   ;; TLA is not installed.
 224   (and (vc-arch-root file)
 225        (vc-arch-file-source-p file)))
 226
 227 (defun vc-arch-default-version (file)
 228   (or (vc-file-getprop (vc-arch-root file) 'arch-default-version)
 229       (let* ((root (vc-arch-root file))
 230              (f (expand-file-name "{arch}/++default-version" root)))
 231         (if (file-readable-p f)
 232             (vc-file-setprop
 233              root 'arch-default-version
 234              (with-temp-buffer
 235                (insert-file-contents f)
 236                ;; Strip the terminating newline.
 237                (buffer-substring (point-min) (1- (point-max)))))))))
 238
 239 (defun vc-arch-workfile-unchanged-p (file)
 240   "Check if FILE is unchanged by diffing against the master version.
 241 Return non-nil if FILE is unchanged."
 242   nil)
 243
 244 (defun vc-arch-state (file)
 245   ;; There's no checkout operation and merging is not done from VC
 246   ;; so the only operation that's state dependent that VC supports is commit
 247   ;; which is only activated if the file is `edited'.
 248   (let* ((root (vc-arch-root file))
 249          (ver (vc-arch-default-version file))
 250          (pat (concat "\\`" (subst-char-in-string ?/ ?% ver)))
 251          (dir (expand-file-name ",,inode-sigs/"
 252                                 (expand-file-name "{arch}" root)))
 253          (sigfile nil))
 254     (dolist (f (if (file-directory-p dir) (directory-files dir t pat)))
 255       (if (or (not sigfile) (file-newer-than-file-p f sigfile))
 256           (setq sigfile f)))
 257     (if (not sigfile)
 258         'edited                         ;We know nothing.
 259       (let ((id (vc-arch-file-id file)))
 260         (setq id (replace-regexp-in-string "[ \t]" "_" id))
 261         (with-current-buffer (find-file-noselect sigfile)
 262           (goto-char (point-min))
 263           (while (and (search-forward id nil 'move)
 264                       (save-excursion
 265                         (goto-char (- (match-beginning 0) 2))
 266                         ;; For `names', the lines start with `?./foo/bar'.
 267                         ;; For others there's 2 chars before the ./foo/bar.
 268                         (or (not (or (bolp) (looking-at "\n?")))
 269                             ;; Ignore E_ entries used for foo.id files.
 270                             (looking-at "E_")))))
 271           (if (eobp)
 272               ;; ID not found.
 273               (if (equal (file-name-nondirectory sigfile)
 274                          (subst-char-in-string
 275                           ?/ ?% (vc-arch-working-revision file)))
 276                   'added
 277                 ;; Might be `added' or `up-to-date' as well.
 278                 ;; FIXME: Check in the patch logs to find out.
 279                 'edited)
 280             ;; Found the ID, let's check the inode.
 281             (if (not (re-search-forward
 282                       "\t.*mtime=\\([0-9]+\\):size=\\([0-9]+\\)"
 283                       (line-end-position) t))
 284                 ;; Buh?  Unexpected format.
 285                 'edited
 286               (let ((ats (file-attributes file)))
 287                 (if (and (eq (nth 7 ats) (string-to-number (match-string 2)))
 288                          (equal (format-time-string "%s" (nth 5 ats))
 289                                 (match-string 1)))
 290                     'up-to-date
 291                   'edited)))))))))
 292
 293 (defun vc-arch-working-revision (file)
 294   (let* ((root (expand-file-name "{arch}" (vc-arch-root file)))
 295          (defbranch (vc-arch-default-version file)))
 296     (when (and defbranch (string-match "\\`\\(.+@[^/\n]+\\)/\\(\\(\\(.*?\\)\\(?:--.*\\)?\\)--.*\\)\\'" defbranch))
 297       (let* ((archive (match-string 1 defbranch))
 298              (category (match-string 4 defbranch))
 299              (branch (match-string 3 defbranch))
 300              (version (match-string 2 defbranch))
 301              (sealed nil) (rev-nb 0)
 302              (rev nil)
 303              logdir tmp)
 304         (setq logdir (expand-file-name category root))
 305         (setq logdir (expand-file-name branch logdir))
 306         (setq logdir (expand-file-name version logdir))
 307         (setq logdir (expand-file-name archive logdir))
 308         (setq logdir (expand-file-name "patch-log" logdir))
 309         (dolist (file (if (file-directory-p logdir) (directory-files logdir)))
 310           ;; Revision names go: base-0, patch-N, version-0, versionfix-M.
 311           (when (and (eq (aref file 0) ?v) (not sealed))
 312             (setq sealed t rev-nb 0))
 313           (if (and (string-match "-\\([0-9]+\\)\\'" file)
 314                    (setq tmp (string-to-number (match-string 1 file)))
 315                    (or (not sealed) (eq (aref file 0) ?v))
 316                    (>= tmp rev-nb))
 317               (setq rev-nb tmp rev file)))
 318         ;; Use "none-000" if the tree hasn't yet been committed on the
 319         ;; default branch.  We'll then get "Arch:000[branch]" on the mode-line.
 320         (concat defbranch "--" (or rev "none-000"))))))
 321
 322
 323 (defcustom vc-arch-mode-line-rewrite
 324   '(("\\`.*--\\(.*--.*\\)--\\(v?\\).*-\\([0-9]+\\)\\'" . "\\2\\3[\\1]"))
 325   "Rewrite rules to shorten Arch's revision names on the mode-line."
 326   :type '(repeat (cons regexp string))
 327   :group 'vc)
 328
 329 (defun vc-arch-mode-line-string (file)
 330   "Return string for placement in modeline by `vc-mode-line' for FILE."
 331   (let ((rev (vc-working-revision file)))
 332     (dolist (rule vc-arch-mode-line-rewrite)
 333       (if (string-match (car rule) rev)
 334           (setq rev (replace-match (cdr rule) t nil rev))))
 335     (format "Arch%c%s"
 336             (case (vc-state file)
 337               ((up-to-date needs-update) ?-)
 338               (added ?@)
 339               (t ?:))
 340             rev)))
 341
 342 (defun vc-arch-diff3-rej-p (rej)
 343   (let ((attrs (file-attributes rej)))
 344     (and attrs (< (nth 7 attrs) 60)
 345          (with-temp-buffer
 346            (insert-file-contents rej)
 347            (goto-char (point-min))
 348            (looking-at "Conflicts occured, diff3 conflict markers left in file\\.")))))
 349
 350 (defun vc-arch-delete-rej-if-obsolete ()
 351   "For use in `after-save-hook'."
 352   (save-excursion
 353     (let ((rej (concat buffer-file-name ".rej")))
 354       (when (and buffer-file-name (vc-arch-diff3-rej-p rej))
 355         (unless (re-search-forward "^<<<<<<< " nil t)
 356           ;; The .rej file is obsolete.
 357           (condition-case nil (delete-file rej) (error nil))
 358           ;; Remove the hook so that it is not called multiple times.
 359           (remove-hook 'after-save-hook 'vc-arch-delete-rej-if-obsolete t))))))
 360
 361 (defun vc-arch-find-file-hook ()
 362   (let ((rej (concat buffer-file-name ".rej")))
 363     (when (and buffer-file-name (file-exists-p rej))
 364       (if (vc-arch-diff3-rej-p rej)
 365           (save-excursion
 366             (goto-char (point-min))
 367             (if (not (re-search-forward "^<<<<<<< " nil t))
 368                 ;; The .rej file is obsolete.
 369                 (condition-case nil (delete-file rej) (error nil))
 370               (smerge-mode 1)
 371               (add-hook 'after-save-hook
 372                         'vc-arch-delete-rej-if-obsolete nil t)
 373               (message "There are unresolved conflicts in this file")))
 374         (message "There are unresolved conflicts in %s"
 375                  (file-name-nondirectory rej))))))
 376
 377 (defun vc-arch-checkin (files rev comment)
 378   (if rev (error "Committing to a specific revision is unsupported"))
 379   ;; FIXME: This implementation probably only works for singleton filesets
 380   (let ((summary (file-relative-name (car files) (vc-arch-root (car files)))))
 381     ;; Extract a summary from the comment.
 382     (when (or (string-match "\\`Summary:[ \t]*\\(.*[^ \t\n]\\)\\([ \t]*\n\\)*" comment)
 383               (string-match "\\`[ \t]*\\(.*[^ \t\n]\\)[ \t]*\\(\n?\\'\\|\n\\([ \t]*\n\\)+\\)" comment))
 384       (setq summary (match-string 1 comment))
 385       (setq comment (substring comment (match-end 0))))
 386     (vc-arch-command nil 0 files "commit" "-s" summary "-L" comment "--"
 387                      (vc-switches 'Arch 'checkin))))
 388
 389 (defun vc-arch-diff (files &optional oldvers newvers buffer)
 390   "Get a difference report using Arch between two versions of FILES."
 391   ;; FIXME: This implementation only works for singleton filesets.  To make
 392   ;; it work for more cases, we have to either call `file-diffs' manually on
 393   ;; each and every `file' in the fileset, or use `changes --diffs' (and
 394   ;; variants) and maybe filter the output with `filterdiff' to only include
 395   ;; the files in which we're interested.
 396   (let ((file (car files)))
 397     (if (and newvers
 398              (vc-up-to-date-p file)
 399              (equal newvers (vc-working-revision file)))
 400         ;; Newvers is the base revision and the current file is unchanged,
 401         ;; so we can diff with the current file.
 402         (setq newvers nil))
 403     (if newvers
 404         (error "Diffing specific revisions not implemented")
 405       (let* ((async (not vc-disable-async-diff))
 406              ;; Run the command from the root dir.
 407              (default-directory (vc-arch-root file))
 408              (status
 409               (vc-arch-command
 410                (or buffer "*vc-diff*")
 411                (if async 'async 1)
 412                nil "file-diffs"
 413                ;; Arch does not support the typical flags.
 414                ;; (vc-switches 'Arch 'diff)
 415                (file-relative-name file)
 416                (if (equal oldvers (vc-working-revision file))
 417                    nil
 418                  oldvers))))
 419         (if async 1 status)))))        ; async diff, pessimistic assumption.
 420
 421 (defun vc-arch-delete-file (file)
 422   (vc-arch-command nil 0 file "rm"))
 423
 424 (defun vc-arch-rename-file (old new)
 425   (vc-arch-command nil 0 new "mv" (file-relative-name old)))
 426
 427 (defalias 'vc-arch-responsible-p 'vc-arch-root)
 428
 429 (defun vc-arch-command (buffer okstatus file &rest flags)
 430   "A wrapper around `vc-do-command' for use in vc-arch.el."
 431   (apply 'vc-do-command buffer okstatus vc-arch-command file flags))
 432
 433 (defun vc-arch-init-revision () nil)
 434
 435 ;;; Completion of versions and revisions.
 436
 437 (defun vc-arch--version-completion-table (root string)
 438   (delq nil
 439         (mapcar
 440          (lambda (d)
 441            (when (string-match "/\\([^/]+\\)/\\([^/]+\\)\\'" d)
 442              (concat (match-string 2 d) "/" (match-string 1 d))))
 443          (let ((default-directory root))
 444            (file-expand-wildcards
 445             (concat "*/*/"
 446                     (if (string-match "/" string)
 447                         (concat (substring string (match-end 0))
 448                                 "*/" (substring string 0 (match-beginning 0)))
 449                       (concat "*/" string))
 450                     "*"))))))
 451
 452 (defun vc-arch-revision-completion-table (files)
 453   (lexical-let ((files files))
 454     (lambda (string pred action)
 455       ;; FIXME: complete revision patches as well.
 456       (let* ((root (expand-file-name "{arch}" (vc-arch-root (car files))))
 457              (table (vc-arch--version-completion-table root string)))
 458         (complete-with-action action table string pred)))))
 459
 460 ;;; Trimming revision libraries.
 461
 462 ;; This code is not directly related to VC and there are many variants of
 463 ;; this functionality available as scripts, but I like this version better,
 464 ;; so maybe others will like it too.
 465
 466 (defun vc-arch-trim-find-least-useful-rev (revs)
 467   (let* ((first (pop revs))
 468          (second (pop revs))
 469          (third (pop revs))
 470          ;; We try to give more importance to recent revisions.  The idea is
 471          ;; that it's OK if checking out a revision 1000-patch-old is ten
 472          ;; times slower than checking out a revision 100-patch-old.  But at
 473          ;; the same time a 2-patch-old rev isn't really ten times more
 474          ;; important than a 20-patch-old, so we use an arbitrary constant
 475          ;; "100" to reduce this effect for recent revisions.  Making this
 476          ;; constant a float has the side effect of causing the subsequent
 477          ;; computations to be done as floats as well.
 478          (max (+ 100.0 (car (or (car (last revs)) third))))
 479          (cost (lambda () (/ (- (car third) (car first)) (- max (car second)))))
 480          (minrev second)
 481          (mincost (funcall cost)))
 482     (while revs
 483       (setq first second)
 484       (setq second third)
 485       (setq third (pop revs))
 486       (when (< (funcall cost) mincost)
 487         (setq minrev second)
 488         (setq mincost (funcall cost))))
 489     minrev))
 490
 491 (defun vc-arch-trim-make-sentinel (revs)
 492   (if (null revs) (lambda (proc msg) (message "VC-Arch trimming ... done"))
 493     `(lambda (proc msg)
 494        (message "VC-Arch trimming %s..." ',(file-name-nondirectory (car revs)))
 495        (rename-file ,(car revs) ,(concat (car revs) "*rm*"))
 496        (setq proc (start-process "vc-arch-trim" nil
 497                                  "rm" "-rf" ',(concat (car revs) "*rm*")))
 498        (set-process-sentinel proc (vc-arch-trim-make-sentinel ',(cdr revs))))))
 499
 500 (defun vc-arch-trim-one-revlib (dir)
 501   "Delete half of the revisions in the revision library."
 502   (interactive "Ddirectory: ")
 503   (let ((revs
 504          (sort (delq nil
 505                      (mapcar
 506                       (lambda (f)
 507                         (when (string-match "-\\([0-9]+\\)\\'" f)
 508                           (cons (string-to-number (match-string 1 f)) f)))
 509                       (directory-files dir nil nil 'nosort)))
 510                'car-less-than-car))
 511         (subdirs nil))
 512     (when (cddr revs)
 513       (dotimes (i (/ (length revs) 2))
 514         (let ((minrev (vc-arch-trim-find-least-useful-rev revs)))
 515           (setq revs (delq minrev revs))
 516           (push minrev subdirs)))
 517       (funcall (vc-arch-trim-make-sentinel
 518                 (mapcar (lambda (x) (expand-file-name (cdr x) dir)) subdirs))
 519                nil nil))))
 520
 521 (defun vc-arch-trim-revlib ()
 522   "Delete half of the revisions in the revision library."
 523   (interactive)
 524   (let ((rl-dir (with-output-to-string
 525                   (call-process vc-arch-command nil standard-output nil
 526                                 "my-revision-library"))))
 527     (while (string-match "\\(.*\\)\n" rl-dir)
 528       (let ((dir (match-string 1 rl-dir)))
 529         (setq rl-dir
 530               (if (and (file-directory-p dir) (file-writable-p dir))
 531                   dir
 532                 (substring rl-dir (match-end 0))))))
 533     (unless (file-writable-p rl-dir)
 534       (error "No writable revlib directory found"))
 535     (message "Revlib at %s" rl-dir)
 536     (let* ((archives (directory-files rl-dir 'full "[^.]\\|..."))
 537            (categories
 538             (apply 'append
 539                    (mapcar (lambda (dir)
 540                              (when (file-directory-p dir)
 541                                (directory-files dir 'full "[^.]\\|...")))
 542                            archives)))
 543            (branches
 544             (apply 'append
 545                    (mapcar (lambda (dir)
 546                              (when (file-directory-p dir)
 547                                (directory-files dir 'full "[^.]\\|...")))
 548                            categories)))
 549            (versions
 550             (apply 'append
 551                    (mapcar (lambda (dir)
 552                              (when (file-directory-p dir)
 553                                (directory-files dir 'full "--.*--")))
 554                            branches))))
 555       (mapc 'vc-arch-trim-one-revlib versions))
 556     ))
 557
 558 (defvar vc-arch-extra-menu-map
 559   (let ((map (make-sparse-keymap)))
 560     (define-key map [add-tagline]
 561       '(menu-item "Add tagline" vc-arch-add-tagline))
 562     map))
 563
 564 (defun vc-arch-extra-menu () vc-arch-extra-menu-map)
 565
 566
 567 ;;; Less obvious implementations.
 568
 569 (defun vc-arch-find-revision (file rev buffer)
 570   (let ((out (make-temp-file "vc-out")))
 571     (unwind-protect
 572         (progn
 573           (with-temp-buffer
 574             (vc-arch-command (current-buffer) 1 nil "file-diffs" file rev)
 575             (call-process-region (point-min) (point-max)
 576                                  "patch" nil nil nil "-R" "-o" out file))
 577           (with-current-buffer buffer
 578             (insert-file-contents out)))
 579       (delete-file out))))
 580
 581 (provide 'vc-arch)
 582
 583 ;; arch-tag: a35c7c1c-5237-429d-88ef-3d718fd2e704
 584 ;;; vc-arch.el ends here