Add the ability to exclude dir-locals from subdirs. (Bug#8100)

* lisp/files.el (dir-locals-collect-variables):
Add the ability to exclude subdirectories.

* doc/emacs/custom.texi (Directory Variables):
Give an example of excluding subdirectories.

* doc/lispref/variables.texi (Directory Local Variables):
Mention `(subdirs . nil)' alist element.

* etc/NEWS: Mention this addition.

* lisp/dired-x.el (dired-omit-here-always): Add `(subdirs . nil)' to locals.

1 files changed, 5 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index cfb788940d0..0777dcc3d2a 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -353,6 +353,11 @@ Just set shell-dir-cookie-re to an appropriate regexp.
 will turn on `whitespace-mode' for *vc-diff* buffers.  Modes should
 call `hack-dir-local-variables-non-file-buffer' to support this.
 
++++
+** You can prevent directory local variables from applying to subdirectories.
+Add an element (subdirs . nil) to the alist portion of any variables
+settings to indicate said section should not be applied to subdirectories.
+
 ** ERC changes
 
 *** New vars `erc-autojoin-timing' and `erc-autojoin-delay'.