Highlight bogus indentation and long lines.

v2: python-mode inherits from prog-mode

Signed-off-by: Andres Gomez <ago...@igalia.com>
---
 .dir-locals.el | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/.dir-locals.el b/.dir-locals.el
index 3bdca17..554cafb 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -1,11 +1,20 @@
 ((nil . ((indent-tabs-mode . t)
         (tab-width . 8)
-        (show-trailing-whitespace . t)))
+        (show-trailing-whitespace . t)
+        (whitespace-style face indentation lines-tail)
+        (whitespace-line-column . 79)))
  (prog-mode .
-           ((c-file-style . "linux")))
+           ((c-file-style . "linux")
+            (eval ignore-errors
+                  (require 'whitespace)
+                  (whitespace-mode 1))))
  (cmake-mode .
-            ((cmake-tab-width . 8)))
+            ((cmake-tab-width . 8)
+             (eval ignore-errors
+                   (require 'whitespace)
+                   (whitespace-mode 1))))
  (python-mode .
              ((indent-tabs-mode . nil)
-              (tab-width . 4)))
+              (tab-width . 4)
+              (whitespace-line-column . 80)))
  )
-- 
2.8.1

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