Fix dir-locals handling for non-file buffers.

* lisp/files.el (dir-locals-collect-variables): Use default-directory
in place of the file name while working on non-file buffers, just
like hack-dir-local-variables already does.

Fixes: debbugs:19140

2 files changed, 7 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index f5ad8de3f8c..55c7a366deb 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -6,6 +6,10 @@
         * files.el (find-file-other-window, find-file-other-frame):
         Use mapc instead of mapcar.  (Bug#18175)
 
+        * files.el (dir-locals-collect-variables): Use default-directory
+        in place of the file name while working on non-file buffers, just
+        like hack-dir-local-variables already does.  (Bug#19140)
+
 2015-01-17  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * emacs-lisp/eieio-core.el (eieio--class-constructor): Rename from
diff --git a/lisp/files.el b/lisp/files.el
index e6d80a9a4dc..e9632edacef 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3602,7 +3602,9 @@ Returns the new list."
   "Collect entries from CLASS-VARIABLES into VARIABLES.
 ROOT is the root directory of the project.
 Return the new variables list."
-  (let* ((file-name (buffer-file-name))
+  (let* ((file-name (or (buffer-file-name)
+                        ;; Handle non-file buffers, too.
+                        (expand-file-name default-directory)))
          (sub-file-name (if file-name
                             ;; FIXME: Why not use file-relative-name?
                             (substring file-name (length root)))))