commit 6f9a168c624f20668aa5f32c2926d3690addd543
Author: Tom Tromey <tom@tromey.com>
Date:   Wed Feb 15 05:19:50 2017 -0700

    Add more branch support to vc-dir
    
    * lisp/vc/vc-dir.el (vc-dir-mode-map) Add "B" bindings.
    * lisp/vc/vc.el (vc-revision-history): New defvar.
    (vc-read-revision): Use vc-revision-history.
    (vc-print-branch-log): New function.

diff --git a/lisp/vc/vc-dir.el b/lisp/vc/vc-dir.el
index 21bd21e..0363aab 100644
--- a/lisp/vc/vc-dir.el
+++ b/lisp/vc/vc-dir.el
@@ -297,6 +297,12 @@ vc-dir-mode-map
     (define-key map (kbd "M-s a M-C-s") 'vc-dir-isearch-regexp)
     (define-key map "G" 'vc-dir-ignore)
 
+    (let ((branch-map (make-sparse-keymap)))
+      (define-key map "B" branch-map)
+      (define-key branch-map "c" 'vc-create-tag)
+      (define-key branch-map "l" 'vc-print-branch-log)
+      (define-key branch-map "s" 'vc-retrieve-tag))
+
     ;; Hook up the menu.
     (define-key map [menu-bar vc-dir-mode]
       `(menu-item
diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index 0c8492d..c5fe8aa 100644
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -1757,6 +1757,9 @@ vc-diff-internal
       ;; because we don't know that yet.
       t)))
 
+(defvar vc-revision-history nil
+  "History for `vc-read-revision'.")
+
 (defun vc-read-revision (prompt &optional files backend default initial-input)
   (cond
    ((null files)
@@ -1768,7 +1771,7 @@ vc-read-revision
          (vc-call-backend backend 'revision-completion-table files)))
     (if completion-table
         (completing-read prompt completion-table
-                         nil nil initial-input nil default)
+                         nil nil initial-input 'vc-revision-history default)
       (read-string prompt initial-input nil default))))
 
 (defun vc-diff-build-argument-list-internal ()
@@ -2373,6 +2376,17 @@ vc-print-root-log
     (vc-print-log-internal backend (list rootdir) nil nil limit)))
 
 ;;;###autoload
+(defun vc-print-branch-log (branch)
+  (interactive
+   (list
+    (vc-read-revision "Branch to log: ")))
+  (when (equal branch "")
+    (error "No branch specified"))
+  (vc-print-log-internal (vc-responsible-backend default-directory)
+                         (list default-directory) branch t
+                         (when (> vc-log-show-limit 0) vc-log-show-limit)))
+
+;;;###autoload
 (defun vc-log-incoming (&optional remote-location)
   "Show a log of changes that will be received with a pull operation from REMOTE-LOCATION.
 When called interactively with a prefix argument, prompt for REMOTE-LOCATION."