1 ;;; vc-arch.el --- VC backend for the Arch version-control system -*- lexical-binding: t -*-
3 ;; Copyright (C) 2004-2014 Free Software Foundation, Inc.
5 ;; Author: FSF (see vc.el for full credits)
6 ;; Maintainer: Stefan Monnier <monnier@gnu.org>
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
26 ;; The home page of the Arch version control system is at
28 ;; http://www.gnuarch.org/
30 ;; This is derived from vc-mcvs.el as follows:
31 ;; - cp vc-mcvs.el vc-arch.el and then M-% mcvs RET arch RET
33 ;; Then of course started the hacking.
35 ;; What has been partly tested:
37 ;; - C-x v = without any prefix arg.
38 ;; - C-x v v to commit a change to a single file.
42 ;; - *vc-log*'s initial content lacks the `Summary:' lines.
43 ;; - All files under the tree are considered as "under Arch's control"
44 ;; without regards to =tagging-method and such.
45 ;; - Files are always considered as `edited'.
46 ;; - C-x v l does not work.
47 ;; - C-x v i does not work.
48 ;; - C-x v ~ does not work.
49 ;; - C-x v u does not work.
50 ;; - C-x v s does not work.
51 ;; - C-x v r does not work.
52 ;; - VC directory listings do not work.
57 (eval-when-compile (require 'vc
))
59 ;;; Properties of the backend
61 (defun vc-arch-revision-granularity () 'repository
)
62 (defun vc-arch-checkout-model (_files) 'implicit
)
65 ;;; Customization options
73 ;; It seems Arch diff does not accept many options, so this is not
74 ;; very useful. It exists mainly so that the VC backends are all
75 ;; consistent with regards to their treatment of diff switches.
76 (defcustom vc-arch-diff-switches t
77 "String or list of strings specifying switches for Arch diff under VC.
78 If nil, use the value of `vc-diff-switches'. If t, use no switches."
79 :type
'(choice (const :tag
"Unspecified" nil
)
81 (string :tag
"Argument String")
82 (repeat :tag
"Argument List" :value
("") string
))
86 (define-obsolete-variable-alias 'vc-arch-command
'vc-arch-program
"23.1")
88 (defcustom vc-arch-program
89 (let ((candidates '("tla" "baz")))
90 (while (and candidates
(not (executable-find (car candidates
))))
91 (setq candidates
(cdr candidates
)))
92 (or (car candidates
) "tla"))
93 "Name of the Arch executable."
97 ;; Clear up the cache to force vc-call to check again and discover
98 ;; new functions when we reload this file.
99 (put 'Arch
'vc-functions nil
)
101 ;;;###autoload (defun vc-arch-registered (file)
102 ;;;###autoload (if (vc-find-root file "{arch}/=tagging-method")
103 ;;;###autoload (progn
104 ;;;###autoload (load "vc-arch" nil t)
105 ;;;###autoload (vc-arch-registered file))))
107 (defun vc-arch-add-tagline ()
108 "Add an `arch-tag' to the end of the current file."
110 (comment-normalize-vars)
111 (goto-char (point-max))
113 (skip-chars-forward " \t\n")
115 ((not (bolp)) (insert "\n\n"))
116 ((not (eq ?
\n (char-before (1- (point))))) (insert "\n")))
118 (idfile (and buffer-file-name
121 (file-name-nondirectory buffer-file-name
)
123 (file-name-directory buffer-file-name
)))))
124 (insert "arch-tag: ")
125 (if (and idfile
(file-exists-p idfile
))
126 ;; If the file is unreadable, we do want to get an error here.
128 (insert-file-contents idfile
)
130 (delete-file idfile
))
132 (call-process "uuidgen" nil t
)
133 (file-error (insert (format "%s <%s> %s"
134 (current-time-string)
136 (+ (nth 2 (current-time))
138 (comment-region beg
(point))))
140 (defconst vc-arch-tagline-re
"^\\W*arch-tag:[ \t]*\\(.*[^ \t\n]\\)")
142 (defmacro vc-with-current-file-buffer
(file &rest body
)
143 (declare (indent 2) (debug t
))
144 `(let ((-kill-buf- nil
)
146 (with-current-buffer (or (find-buffer-visiting -file-
)
147 (setq -kill-buf-
(generate-new-buffer " temp")))
148 ;; Avoid find-file-literally since it can do many undesirable extra
149 ;; things (among which, call us back into an infinite loop).
150 (if -kill-buf-
(insert-file-contents -file-
))
153 (if (buffer-live-p -kill-buf-
) (kill-buffer -kill-buf-
))))))
155 (defun vc-arch-file-source-p (file)
156 "Can return nil, `maybe' or a non-nil value.
157 Only the value `maybe' can be trusted :-(."
158 ;; FIXME: Check the tag and name of parent dirs.
159 (unless (string-match "\\`[,+]" (file-name-nondirectory file
))
160 (or (string-match "\\`{arch}/"
161 (file-relative-name file
(vc-arch-root file
)))
163 ;; Check the presence of an ID file.
165 (concat ".arch-ids/" (file-name-nondirectory file
) ".id")
166 (file-name-directory file
)))
167 ;; Check the presence of a tagline.
168 (vc-with-current-file-buffer file
170 (goto-char (point-max))
171 (or (re-search-backward vc-arch-tagline-re
(- (point) 1000) t
)
173 (goto-char (point-min))
174 (re-search-forward vc-arch-tagline-re
(+ (point) 1000) t
)))))
175 ;; FIXME: check =tagging-method to see whether untagged files might
178 (find-file-noselect (expand-file-name "{arch}/=tagging-method"
179 (vc-arch-root file
)))
180 (let ((untagged-source t
)) ;Default is `names'.
182 (goto-char (point-min))
183 (if (re-search-forward "^[ \t]*\\(\\(tagline\\|implicit\\|names\\)\\|explicit\\)" nil t
)
184 (setq untagged-source
(match-end 2)))
185 (if (re-search-forward "^[ \t]*untagged-source[ \t]+\\(\\(source\\)\\|precious\\|backup\\|junk\\|unrecognized\\)" nil t
)
186 (setq untagged-source
(match-end 2))))
187 (if untagged-source
'maybe
))))))
189 (defun vc-arch-file-id (file)
190 ;; Don't include the kind of ID this is because it seems to be too messy.
191 (let ((idfile (expand-file-name
192 (concat ".arch-ids/" (file-name-nondirectory file
) ".id")
193 (file-name-directory file
))))
194 (if (file-exists-p idfile
)
196 (insert-file-contents idfile
)
197 (looking-at ".*[^ \n\t]")
199 (with-current-buffer (find-file-noselect file
)
201 (goto-char (point-max))
202 (if (or (re-search-backward vc-arch-tagline-re
(- (point) 1000) t
)
204 (goto-char (point-min))
205 (re-search-forward vc-arch-tagline-re
(+ (point) 1000) t
)))
207 (concat "./" (file-relative-name file
(vc-arch-root file
)))))))))
209 (defun vc-arch-tagging-method (file)
212 (expand-file-name "{arch}/=tagging-method" (vc-arch-root file
)))
214 (goto-char (point-min))
215 (if (re-search-forward
216 "^[ \t]*\\(tagline\\|implicit\\|names\\|explicit\\)" nil t
)
217 (intern (match-string 1))
220 (defun vc-arch-root (file)
221 "Return the root directory of an Arch project, if any."
222 (or (vc-file-getprop file
'arch-root
)
223 ;; Check the =tagging-method, in case someone naively manually
224 ;; creates a {arch} directory somewhere.
225 (let ((root (vc-find-root file
"{arch}/=tagging-method")))
228 file
'arch-root root
)))))
230 (defun vc-arch-find-admin-dir (file)
231 "Return the administrative directory of FILE."
232 (expand-file-name "{arch}" (vc-arch-root file
)))
234 (defun vc-arch-register (files &optional rev _comment
)
235 (if rev
(error "Explicit initial revision not supported for Arch"))
237 (let ((tagmet (vc-arch-tagging-method file
)))
238 (if (and (memq tagmet
'(tagline implicit
)) comment-start
)
239 (with-current-buffer (find-file-noselect file
)
240 (if (buffer-modified-p)
241 (error "Save %s first" (buffer-name)))
242 (vc-arch-add-tagline)
244 (vc-arch-command nil
0 files
"add"))
246 (defun vc-arch-registered (file)
247 ;; Don't seriously check whether it's source or not. Checking would
248 ;; require running TLA, so it's better to not do it, so it also works if
249 ;; TLA is not installed.
250 (and (vc-arch-root file
)
251 (vc-arch-file-source-p file
)))
253 (defun vc-arch-default-version (file)
254 (or (vc-file-getprop (vc-arch-root file
) 'arch-default-version
)
255 (let* ((root (vc-arch-root file
))
256 (f (expand-file-name "{arch}/++default-version" root
)))
257 (if (file-readable-p f
)
259 root
'arch-default-version
261 (insert-file-contents f
)
262 ;; Strip the terminating newline.
263 (buffer-substring (point-min) (1- (point-max)))))))))
265 (defun vc-arch-workfile-unchanged-p (_file)
266 "Stub: arch workfiles are always considered to be in a changed state,"
269 (defun vc-arch-state (file)
270 ;; There's no checkout operation and merging is not done from VC
271 ;; so the only operation that's state dependent that VC supports is commit
272 ;; which is only activated if the file is `edited'.
273 (let* ((root (vc-arch-root file
))
274 (ver (vc-arch-default-version file
))
275 (pat (concat "\\`" (subst-char-in-string ?
/ ?% ver
)))
276 (dir (expand-file-name ",,inode-sigs/"
277 (expand-file-name "{arch}" root
)))
279 (dolist (f (if (file-directory-p dir
) (directory-files dir t pat
)))
280 (if (or (not sigfile
) (file-newer-than-file-p f sigfile
))
283 'edited
;We know nothing.
284 (let ((id (vc-arch-file-id file
)))
285 (setq id
(replace-regexp-in-string "[ \t]" "_" id
))
286 (with-current-buffer (find-file-noselect sigfile
)
287 (goto-char (point-min))
288 (while (and (search-forward id nil
'move
)
290 (goto-char (- (match-beginning 0) 2))
291 ;; For `names', the lines start with `?./foo/bar'.
292 ;; For others there's 2 chars before the ./foo/bar.
293 (or (not (or (bolp) (looking-at "\n?")))
294 ;; Ignore E_ entries used for foo.id files.
295 (looking-at "E_")))))
298 (if (equal (file-name-nondirectory sigfile
)
299 (subst-char-in-string
300 ?
/ ?%
(vc-arch-working-revision file
)))
302 ;; Might be `added' or `up-to-date' as well.
303 ;; FIXME: Check in the patch logs to find out.
305 ;; Found the ID, let's check the inode.
306 (if (not (re-search-forward
307 "\t.*mtime=\\([0-9]+\\):size=\\([0-9]+\\)"
308 (line-end-position) t
))
309 ;; Buh? Unexpected format.
311 (let ((ats (file-attributes file
)))
312 (if (and (eq (nth 7 ats
) (string-to-number (match-string 2)))
313 (equal (format-time-string "%s" (nth 5 ats
))
318 ;; -dir-status called from vc-dir, which loads vc, which loads vc-dispatcher.
319 (declare-function vc-exec-after
"vc-dispatcher" (code))
321 (defun vc-arch-dir-status (dir callback
)
322 "Run 'tla inventory' for DIR and pass results to CALLBACK.
323 CALLBACK expects (ENTRIES &optional MORE-TO-COME); see
325 (let ((default-directory dir
))
326 (vc-arch-command t
'async nil
"changes"))
327 ;; The updating could be done asynchronously.
329 (vc-arch-after-dir-status callback
)))
331 (defun vc-arch-after-dir-status (callback)
332 (let* ((state-map '(("M " . edited
)
333 ("Mb" . edited
) ;binary
335 ("D/" . removed
) ;directory
337 ("A/" . added
) ;directory
339 ("/>" . renamed
) ;directory
340 ("lf" . symlink-to-file
)
341 ("fl" . file-to-symlink
)
342 ("--" . permissions-changed
)
343 ("-/" . permissions-changed
) ;directory
345 (state-map-regexp (regexp-opt (mapcar 'car state-map
) t
))
346 (entry-regexp (concat "^" state-map-regexp
" \\(.*\\)$"))
348 (goto-char (point-min))
349 ;;(message "Got %s" (buffer-string))
350 (while (re-search-forward entry-regexp nil t
)
351 (let* ((state-string (match-string 1))
352 (state (cdr (assoc state-string state-map
)))
353 (filename (match-string 2)))
354 (push (list filename state
) result
)))
356 (funcall callback result nil
)))
358 (defun vc-arch-working-revision (file)
359 (let* ((root (expand-file-name "{arch}" (vc-arch-root file
)))
360 (defbranch (vc-arch-default-version file
)))
361 (when (and defbranch
(string-match "\\`\\(.+@[^/\n]+\\)/\\(\\(\\(.*?\\)\\(?:--.*\\)?\\)--.*\\)\\'" defbranch
))
362 (let* ((archive (match-string 1 defbranch
))
363 (category (match-string 4 defbranch
))
364 (branch (match-string 3 defbranch
))
365 (version (match-string 2 defbranch
))
366 (sealed nil
) (rev-nb 0)
369 (setq logdir
(expand-file-name category root
))
370 (setq logdir
(expand-file-name branch logdir
))
371 (setq logdir
(expand-file-name version logdir
))
372 (setq logdir
(expand-file-name archive logdir
))
373 (setq logdir
(expand-file-name "patch-log" logdir
))
374 (dolist (file (if (file-directory-p logdir
) (directory-files logdir
)))
375 ;; Revision names go: base-0, patch-N, version-0, versionfix-M.
376 (when (and (eq (aref file
0) ?v
) (not sealed
))
377 (setq sealed t rev-nb
0))
378 (if (and (string-match "-\\([0-9]+\\)\\'" file
)
379 (setq tmp
(string-to-number (match-string 1 file
)))
380 (or (not sealed
) (eq (aref file
0) ?v
))
382 (setq rev-nb tmp rev file
)))
383 ;; Use "none-000" if the tree hasn't yet been committed on the
384 ;; default branch. We'll then get "Arch:000[branch]" on the mode-line.
385 (concat defbranch
"--" (or rev
"none-000"))))))
388 (defcustom vc-arch-mode-line-rewrite
389 '(("\\`.*--\\(.*--.*\\)--\\(v?\\).*-\\([0-9]+\\)\\'" .
"\\2\\3[\\1]"))
390 "Rewrite rules to shorten Arch's revision names on the mode-line."
391 :type
'(repeat (cons regexp string
))
394 (defun vc-arch-mode-line-string (file)
395 "Return a string for `vc-mode-line' to put in the mode line for FILE."
396 (let ((rev (vc-working-revision file
)))
397 (dolist (rule vc-arch-mode-line-rewrite
)
398 (if (string-match (car rule
) rev
)
399 (setq rev
(replace-match (cdr rule
) t nil rev
))))
401 (pcase (vc-state file
)
402 ((or `up-to-date
`needs-update
) ?-
)
407 (defun vc-arch-diff3-rej-p (rej)
408 (let ((attrs (file-attributes rej
)))
409 (and attrs
(< (nth 7 attrs
) 60)
411 (insert-file-contents rej
)
412 (goto-char (point-min))
413 (looking-at "Conflicts occurred, diff3 conflict markers left in file\\.")))))
415 (defun vc-arch-delete-rej-if-obsolete ()
416 "For use in `after-save-hook'."
418 (let ((rej (concat buffer-file-name
".rej")))
419 (when (and buffer-file-name
(vc-arch-diff3-rej-p rej
))
420 (unless (re-search-forward "^<<<<<<< " nil t
)
421 ;; The .rej file is obsolete.
422 (condition-case nil
(delete-file rej
) (error nil
))
423 ;; Remove the hook so that it is not called multiple times.
424 (remove-hook 'after-save-hook
'vc-arch-delete-rej-if-obsolete t
))))))
426 (defun vc-arch-find-file-hook ()
427 (let ((rej (concat buffer-file-name
".rej")))
428 (when (and buffer-file-name
(file-exists-p rej
))
429 (if (vc-arch-diff3-rej-p rej
)
431 (goto-char (point-min))
432 (if (not (re-search-forward "^<<<<<<< " nil t
))
433 ;; The .rej file is obsolete.
434 (condition-case nil
(delete-file rej
) (error nil
))
436 (add-hook 'after-save-hook
437 'vc-arch-delete-rej-if-obsolete nil t
)
438 (message "There are unresolved conflicts in this file")))
439 (message "There are unresolved conflicts in %s"
440 (file-name-nondirectory rej
))))))
442 (autoload 'vc-switches
"vc")
444 (defun vc-arch-checkin (files rev comment
)
445 (if rev
(error "Committing to a specific revision is unsupported"))
446 ;; FIXME: This implementation probably only works for singleton filesets
447 (let ((summary (file-relative-name (car files
) (vc-arch-root (car files
)))))
448 ;; Extract a summary from the comment.
449 (when (or (string-match "\\`Summary:[ \t]*\\(.*[^ \t\n]\\)\\([ \t]*\n\\)*" comment
)
450 (string-match "\\`[ \t]*\\(.*[^ \t\n]\\)[ \t]*\\(\n?\\'\\|\n\\([ \t]*\n\\)+\\)" comment
))
451 (setq summary
(match-string 1 comment
))
452 (setq comment
(substring comment
(match-end 0))))
453 (vc-arch-command nil
0 files
"commit" "-s" summary
"-L" comment
"--"
454 (vc-switches 'Arch
'checkin
))))
456 (defun vc-arch-diff (files &optional oldvers newvers buffer
)
457 "Get a difference report using Arch between two versions of FILES."
458 ;; FIXME: This implementation only works for singleton filesets. To make
459 ;; it work for more cases, we have to either call `file-diffs' manually on
460 ;; each and every `file' in the fileset, or use `changes --diffs' (and
461 ;; variants) and maybe filter the output with `filterdiff' to only include
462 ;; the files in which we're interested.
463 (let ((file (car files
)))
465 (vc-up-to-date-p file
)
466 (equal newvers
(vc-working-revision file
)))
467 ;; Newvers is the base revision and the current file is unchanged,
468 ;; so we can diff with the current file.
471 (error "Diffing specific revisions not implemented")
472 (let* (process-file-side-effects
473 (async (not vc-disable-async-diff
))
474 ;; Run the command from the root dir.
475 (default-directory (vc-arch-root file
))
478 (or buffer
"*vc-diff*")
481 (vc-switches 'Arch
'diff
)
482 (file-relative-name file
)
483 (if (equal oldvers
(vc-working-revision file
))
486 (if async
1 status
))))) ; async diff, pessimistic assumption.
488 (defun vc-arch-delete-file (file)
489 (vc-arch-command nil
0 file
"rm"))
491 (defun vc-arch-rename-file (old new
)
492 (vc-arch-command nil
0 new
"mv" (file-relative-name old
)))
494 (defalias 'vc-arch-responsible-p
'vc-arch-root
)
496 (defun vc-arch-command (buffer okstatus file
&rest flags
)
497 "A wrapper around `vc-do-command' for use in vc-arch.el."
498 (apply 'vc-do-command
(or buffer
"*vc*") okstatus vc-arch-program file flags
))
500 (defun vc-arch-init-revision () nil
)
502 ;;; Completion of versions and revisions.
504 (defun vc-arch--version-completion-table (root string
)
508 (when (string-match "/\\([^/]+\\)/\\([^/]+\\)\\'" d
)
509 (concat (match-string 2 d
) "/" (match-string 1 d
))))
510 (let ((default-directory root
))
511 (file-expand-wildcards
513 (if (string-match "/" string
)
514 (concat (substring string
(match-end 0))
515 "*/" (substring string
0 (match-beginning 0)))
516 (concat "*/" string
))
519 (defun vc-arch-revision-completion-table (files)
520 (lambda (string pred action
)
521 ;; FIXME: complete revision patches as well.
522 (let* ((root (expand-file-name "{arch}" (vc-arch-root (car files
))))
523 (table (vc-arch--version-completion-table root string
)))
524 (complete-with-action action table string pred
))))
526 ;;; Trimming revision libraries.
528 ;; This code is not directly related to VC and there are many variants of
529 ;; this functionality available as scripts, but I like this version better,
530 ;; so maybe others will like it too.
532 (defun vc-arch-trim-find-least-useful-rev (revs)
533 (let* ((first (pop revs
))
536 ;; We try to give more importance to recent revisions. The idea is
537 ;; that it's OK if checking out a revision 1000-patch-old is ten
538 ;; times slower than checking out a revision 100-patch-old. But at
539 ;; the same time a 2-patch-old rev isn't really ten times more
540 ;; important than a 20-patch-old, so we use an arbitrary constant
541 ;; "100" to reduce this effect for recent revisions. Making this
542 ;; constant a float has the side effect of causing the subsequent
543 ;; computations to be done as floats as well.
544 (max (+ 100.0 (car (or (car (last revs
)) third
))))
545 (cost (lambda () (/ (- (car third
) (car first
)) (- max
(car second
)))))
547 (mincost (funcall cost
)))
551 (setq third
(pop revs
))
552 (when (< (funcall cost
) mincost
)
554 (setq mincost
(funcall cost
))))
557 (defun vc-arch-trim-make-sentinel (revs)
558 (if (null revs
) (lambda (_proc _msg
) (message "VC-Arch trimming ... done"))
560 (message "VC-Arch trimming %s..." (file-name-nondirectory (car revs
)))
561 (rename-file (car revs
) (concat (car revs
) "*rm*"))
562 (let ((proc (start-process "vc-arch-trim" nil
563 "rm" "-rf" (concat (car revs
) "*rm*"))))
564 (set-process-sentinel proc
(vc-arch-trim-make-sentinel (cdr revs
)))))))
566 (defun vc-arch-trim-one-revlib (dir)
567 "Delete half of the revisions in the revision library."
568 (interactive "Ddirectory: ")
569 (let ((garbage (directory-files dir
'full
"\\`,," 'nosort
)))
571 (funcall (vc-arch-trim-make-sentinel garbage
) nil nil
)))
576 (when (string-match "-\\([0-9]+\\)\\'" f
)
577 (cons (string-to-number (match-string 1 f
)) f
)))
578 (directory-files dir nil nil
'nosort
)))
582 (dotimes (_i (/ (length revs
) 2))
583 (let ((minrev (vc-arch-trim-find-least-useful-rev revs
)))
584 (setq revs
(delq minrev revs
))
585 (push minrev subdirs
)))
586 (funcall (vc-arch-trim-make-sentinel
587 (mapcar (lambda (x) (expand-file-name (cdr x
) dir
)) subdirs
))
590 (defun vc-arch-trim-revlib ()
591 "Delete half of the revisions in the revision library."
593 (let ((rl-dir (with-output-to-string
594 (call-process vc-arch-program nil standard-output nil
595 "my-revision-library"))))
596 (while (string-match "\\(.*\\)\n" rl-dir
)
597 (let ((dir (match-string 1 rl-dir
)))
599 (if (and (file-directory-p dir
) (file-writable-p dir
))
601 (substring rl-dir
(match-end 0))))))
602 (unless (file-writable-p rl-dir
)
603 (error "No writable revlib directory found"))
604 (message "Revlib at %s" rl-dir
)
605 (let* ((archives (directory-files rl-dir
'full
"[^.]\\|..."))
608 (mapcar (lambda (dir)
609 (when (file-directory-p dir
)
610 (directory-files dir
'full
"[^.]\\|...")))
614 (mapcar (lambda (dir)
615 (when (file-directory-p dir
)
616 (directory-files dir
'full
"[^.]\\|...")))
620 (mapcar (lambda (dir)
621 (when (file-directory-p dir
)
622 (directory-files dir
'full
"--.*--")))
624 (mapc 'vc-arch-trim-one-revlib versions
))
627 (defvar vc-arch-extra-menu-map
628 (let ((map (make-sparse-keymap)))
629 (define-key map
[add-tagline
]
630 '(menu-item "Add tagline" vc-arch-add-tagline
))
633 (defun vc-arch-extra-menu () vc-arch-extra-menu-map
)
636 ;;; Less obvious implementations.
638 (defun vc-arch-find-revision (file rev buffer
)
639 (let ((out (make-temp-file "vc-out")))
643 (vc-arch-command (current-buffer) 1 nil
"file-diffs" file rev
)
644 (call-process-region (point-min) (point-max)
645 "patch" nil nil nil
"-R" "-o" out file
))
646 (with-current-buffer buffer
647 (insert-file-contents out
)))
652 ;;; vc-arch.el ends here