`magit-svn-find-rev' now supports the prefix arg.

* magit.el (magit-svn-find-rev): Prefix support for branch name.
* magit.texi: Documenting magit-svn-find-rev.

magit.el

@@ -2182,16 +2182,22 @@ in log buffer."
 
 ;; git svn commands
 
-(defun magit-svn-find-rev (rev)
-  (interactive "SVN revision: ")
-  (let* ((sha (magit-git-string "svn" "find-rev"
-				(concat "r" (number-to-string rev)))))
+(defun magit-svn-find-rev (rev &optional branch)
+  (interactive
+   (list (read-input "SVN revision: ")
+         (if current-prefix-arg
+             (read-input "In branch: "))))
+  (let* ((sha (apply 'magit-git-string
+                     `("svn"
+                       "find-rev"
+                       ,(concat "r" rev)
+                       ,@(when branch (list branch))))))
     (if sha
-      (magit-show-commit
-       (magit-with-section sha 'commit
-	 (magit-set-section-info sha)
-	 sha))
-      (error "Revision %d could not be mapped to a commit" rev))))
+        (magit-show-commit
+         (magit-with-section sha 'commit
+           (magit-set-section-info sha)
+           sha))
+      (error "Revision %s could not be mapped to a commit" rev))))
 
 (defun magit-svn-rebase ()
   (interactive)

magit.texi

@@ -634,4 +634,10 @@ Magit shows them in a section called @emph{Unpulled changes}.  Typing
 Typing @kbd{N r} runs @code{git svn rebase} and typing @kbd{N c} runs
 @code{git svn dcommit}.
 
+@kbd{N f} will prompt you for a (numeric, Subversion) revision and
+then search for a corresponding Git sha1 for the commit. This is
+limited to the path of the remote Subversion repository. With a prefix
+(@kbd{C-u N f} the user will also be prompted for a branch to search
+in.
+
 @bye