vc-revert-file: Support reverting directories

* lisp/vc/vc.el (vc-revert-file): Support reverting directories
by calling vc-responsible-backend instead of vc-backend when
FILE is a directory (bug#37310, bug#43464).  Based on an
approach by Dmitry Gutov <dmitry@gutov.dev>.
(vc-rename-file): Add a FIXME to support reverting directories.
* etc/NEWS: Document the new functionality.

(cherry picked from commit 2d59974da71ec7ae20175d74269d4ca3d9be1cc7)

diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index f06e6e8717a496f6e12847b01674cb8c632f72d4..5652ceb84a9aadc5b20aff48e77e468b93c89e14 100644 (file)
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -3381,14 +3381,19 @@ its name; otherwise return nil."
          backup-file)))))
 
 (defun vc-revert-file (file)
-  "Revert FILE back to the repository working revision it was based on."
+  "Revert FILE back to the repository working revision it was based on.
+If FILE is a directory, revert all files inside that directory."
   (with-vc-properties
    (list file)
-   (let ((backup-file (vc-version-backup-file file)))
+   (let* ((dir (file-directory-p file))
+          (backup-file (and (not dir) (vc-version-backup-file file))))
      (when backup-file
        (copy-file backup-file file 'ok-if-already-exists)
        (vc-delete-automatic-version-backups file))
-     (vc-call revert file backup-file))
+     (vc-call-backend (if dir
+                          (vc-responsible-backend file)
+                        (vc-backend file))
+                      'revert file backup-file))
    `((vc-state . up-to-date)
      (vc-checkout-time . ,(file-attribute-modification-time
                           (file-attributes file)))))
@@ -3542,6 +3547,15 @@ buffer's file name if it's under version control."
   "Rename file OLD to NEW in both work area and repository.
 If called interactively, read OLD and NEW, defaulting OLD to the
 current buffer's file name if it's under version control."
+  ;; FIXME: Support renaming whole directories.
+  ;; The use of `vc-call' will need to change to something like
+  ;;
+  ;;     (vc-call-backend (if dir
+  ;;                          (vc-responsible-backend file)
+  ;;                        (vc-backend file))
+  ;;                      'rename-file old new)
+  ;;
+  ;; as was done in `vc-revert-file'; see bug#43464.  --spwhitton
   (interactive (list (read-file-name "VC rename file: " nil
                                      (when (vc-backend buffer-file-name)
                                        buffer-file-name) t)