From: Charles A. Roelli <charles@aurox.ch>
Date: Wed, 20 Dec 2017 19:40:14 +0000 (+0100)
Subject: Ensure current buffer is version-controlled in vc-region-history
X-Git-Tag: emacs-27.0.90~5994
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=7d392ccd69f4925bb9990c8267a2b710c80ec5c5;p=emacs.git

Ensure current buffer is version-controlled in vc-region-history

* lisp/vc/vc.el (vc-region-history): Ensure buffer is
version-controlled.  Otherwise if a user runs it in a
non-version-controlled buffer, they get the error:

  Cannot open load file: No such file or directory, vc-nil
---

diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index 211feddc55d..b1599915007 100644
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -2422,6 +2422,8 @@ When called interactively with a prefix argument, prompt for REMOTE-LOCATION."
          (file buffer-file-name)
          (backend (vc-backend file))
          (buf (get-buffer-create "*VC-history*")))
+    (unless backend
+      (error "Buffer is not version controlled"))
     (with-current-buffer buf
       (setq-local vc-log-view-type 'long))
     (vc-call region-history file buf lfrom lto)