Add .dir-locals.el support for file-less buffers.

* files.el (hack-local-variables): Split out code to apply local
variable settings ...
(hack-local-variables-apply): ... here.  New function.
(hack-dir-local-variables): Use the default directory for when the
buffer does not have an associated file.
(hack-dir-local-variables-non-file-buffer): New function.
* diff-mode.el (diff-mode):
* vc-annotate.el (vc-annotate-mode):
* vc-dir.el (vc-dir-mode):
* log-edit.el (log-edit-mode):
* log-view.el (log-view-mode): Call hack-dir-local-variables-non-file-buffer.

8 files changed, 51 insertions, 16 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 82c63f4449b..fcc08e7b6e5 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -40,6 +40,11 @@ so we will look at it and add it to the manual.
 
 *** vc-dir for Bzr supports viewing shelve contents and shelving snapshots.
 
+** Directory local variables can apply to file-less buffers.
+For example, adding "(diff-mode . ((mode . whitespace)))" to your
+.dir-locals.el file, will turn on `whitespace-mode' for *vc-diff*
+buffers.
+
 
 * New Modes and Packages in Emacs 24.1
 
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index e7f4f17d549..1e54ed03a90 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,21 @@
+2010-03-12    <dann@ics.uci.edu>
+
+
+2010-03-12  Dan Nicolaescu  <dann@ics.uci.edu>
+
+        Add .dir-locals.el support for file-less buffers.
+        * files.el (hack-local-variables): Split out code to apply local
+        variable settings ...
+        (hack-local-variables-apply): ... here.  New function.
+        (hack-dir-local-variables): Use the default directory for when the
+        buffer does not have an associated file.
+        (hack-dir-local-variables-non-file-buffer): New function.
+        * diff-mode.el (diff-mode):
+        * vc-annotate.el (vc-annotate-mode):
+        * vc-dir.el (vc-dir-mode):
+        * log-edit.el (log-edit-mode):
+        * log-view.el (log-view-mode): Call hack-dir-local-variables-non-file-buffer.
+
 2010-03-12  Dan Nicolaescu  <dann@ics.uci.edu>
 
         Add support for shelving snapshots and for showing shelves.
diff --git a/lisp/diff-mode.el b/lisp/diff-mode.el
index 27f8318f91c..75ea98ba911 100644
--- a/lisp/diff-mode.el
+++ b/lisp/diff-mode.el
@@ -1287,7 +1287,9 @@ a diff with \\[diff-reverse-direction].
   (set (make-local-variable 'add-log-current-defun-function)
        'diff-current-defun)
   (set (make-local-variable 'add-log-buffer-file-name-function)
-       (lambda () (diff-find-file-name nil 'noprompt))))
+       (lambda () (diff-find-file-name nil 'noprompt)))
+  (unless (buffer-file-name)
+    (hack-dir-local-variables-non-file-buffer)))
 
 ;;;###autoload
 (define-minor-mode diff-minor-mode
diff --git a/lisp/files.el b/lisp/files.el
index 99fa7ddf1b5..07442d4ba14 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3112,14 +3112,17 @@ is specified, returning t if it is specified."
           ;; Otherwise, set the variables.
           (enable-local-variables
            (hack-local-variables-filter result nil)
-           (when file-local-variables-alist
-             ;; Any 'evals must run in the Right sequence.
-             (setq file-local-variables-alist
-                   (nreverse file-local-variables-alist))
-             (run-hooks 'before-hack-local-variables-hook)
-             (dolist (elt file-local-variables-alist)
-               (hack-one-local-variable (car elt) (cdr elt))))
-           (run-hooks 'hack-local-variables-hook)))))
+           (hack-local-variables-apply)))))
+
+(defun hack-local-variables-apply ()
+  (when file-local-variables-alist
+    ;; Any 'evals must run in the Right sequence.
+    (setq file-local-variables-alist
+          (nreverse file-local-variables-alist))
+    (run-hooks 'before-hack-local-variables-hook)
+    (dolist (elt file-local-variables-alist)
+      (hack-one-local-variable (car elt) (cdr elt))))
+  (run-hooks 'hack-local-variables-hook))
 
 (defun safe-local-variable-p (sym val)
   "Non-nil if SYM is safe as a file-local variable with value VAL.
@@ -3413,15 +3416,14 @@ is found.  Returns the new class name."
 Store the directory-local variables in `dir-local-variables-alist'
 and `file-local-variables-alist', without applying them."
   (when (and enable-local-variables
-             (buffer-file-name)
-             (not (file-remote-p (buffer-file-name))))
+             (not (file-remote-p (or (buffer-file-name) default-directory))))
     ;; Find the variables file.
-    (let ((variables-file (dir-locals-find-file (buffer-file-name)))
+    (let ((variables-file (dir-locals-find-file (or (buffer-file-name) default-directory)))
           (class nil)
           (dir-name nil))
       (cond
        ((stringp variables-file)
-        (setq dir-name (file-name-directory (buffer-file-name)))
+        (setq dir-name (if (buffer-file-name) (file-name-directory (buffer-file-name)) default-directory))
         (setq class (dir-locals-read-from-file variables-file)))
        ((consp variables-file)
         (setq dir-name (nth 0 variables-file))
@@ -3438,6 +3440,10 @@ and `file-local-variables-alist', without applying them."
               (push elt dir-local-variables-alist))
             (hack-local-variables-filter variables dir-name)))))))
 
+(defun hack-dir-local-variables-non-file-buffer ()
+  (hack-dir-local-variables)
+  (hack-local-variables-apply))
+
 
 (defcustom change-major-mode-with-file-name t
   "Non-nil means \\[write-file] should set the major mode from the file name.
diff --git a/lisp/log-edit.el b/lisp/log-edit.el
index 10c6d480d23..e26521642da 100644
--- a/lisp/log-edit.el
+++ b/lisp/log-edit.el
@@ -368,7 +368,8 @@ commands (under C-x v for VC, for example).
 \\{log-edit-mode-map}"
   (set (make-local-variable 'font-lock-defaults)
        '(log-edit-font-lock-keywords t))
-  (make-local-variable 'log-edit-comment-ring-index))
+  (make-local-variable 'log-edit-comment-ring-index)
+  (hack-dir-local-variables-non-file-buffer))
 
 (defun log-edit-hide-buf (&optional buf where)
   (when (setq buf (get-buffer (or buf log-edit-files-buf)))
diff --git a/lisp/log-view.el b/lisp/log-view.el
index 6fbe8429671..5c454ead5fc 100644
--- a/lisp/log-view.el
+++ b/lisp/log-view.el
@@ -255,7 +255,8 @@ The match group number 1 should match the revision number itself.")
        'log-view-beginning-of-defun)
   (set (make-local-variable 'end-of-defun-function)
        'log-view-end-of-defun)
-  (set (make-local-variable 'cvs-minor-wrap-function) 'log-view-minor-wrap))
+  (set (make-local-variable 'cvs-minor-wrap-function) 'log-view-minor-wrap)
+  (hack-dir-local-variables-non-file-buffer))
 
 ;;;;
 ;;;; Navigation
diff --git a/lisp/vc-annotate.el b/lisp/vc-annotate.el
index 71839443553..1878fe8740f 100644
--- a/lisp/vc-annotate.el
+++ b/lisp/vc-annotate.el
@@ -162,7 +162,8 @@ menu items."
   (remove-from-invisibility-spec 'foo)
   (set (make-local-variable 'truncate-lines) t)
   (set (make-local-variable 'font-lock-defaults)
-       '(vc-annotate-font-lock-keywords t)))
+       '(vc-annotate-font-lock-keywords t))
+  (hack-dir-local-variables-non-file-buffer))
 
 (defun vc-annotate-toggle-annotation-visibility ()
   "Toggle whether or not the annotation is visible."
diff --git a/lisp/vc-dir.el b/lisp/vc-dir.el
index 2f661e8becf..a0350eb3013 100644
--- a/lisp/vc-dir.el
+++ b/lisp/vc-dir.el
@@ -938,6 +938,7 @@ the *vc-dir* buffer.
     ;; Make sure that if the directory buffer is killed, the update
     ;; process running in the background is also killed.
     (add-hook 'kill-buffer-query-functions 'vc-dir-kill-query nil t)
+    (hack-dir-local-variables-non-file-buffer)
     (vc-dir-refresh)))
 
 (defun vc-dir-headers (backend dir)