[git-whitespace-hook] Reject CMake files which include tabs.

bin/git-whitespace-hook

@@ -23,12 +23,12 @@ else
 fi
 
 
-# By default, we disallow trailing whitespace for the following files, but the check for C/C++ sources
+# By default, we disallow trailing whitespace for the following files, but the check for C/C++ and CMake sources
 # happens in the tab-in-indent check to avoid confusing users with duplicate error messages
-TRAILING_WHITESPACE_DEFAULT='.*(Makefile.am|configure.ac|dune.module|README|README.SVN|COPYING|INSTALL|TODO|\.cmake|CMakeLists.txt|\.pc\.in)$'
+TRAILING_WHITESPACE_DEFAULT='.*(Makefile.am|configure.ac|dune.module|README|README.SVN|COPYING|INSTALL|TODO|\.pc\.in)$'
 
-# By default, we disallow tabs in indents and trailing whitespace in C/C++ source files
-TAB_IN_INDENT_DEFAULT='\.(cpp|hpp|cc|hh|c|h)$'
+# By default, we disallow tabs in indents and trailing whitespace in C/C++ and CMake source files
+TAB_IN_INDENT_DEFAULT='.*(\.cpp|\.hpp|\.cc|\.hh|\.c|\.h|\.cmake|CMakeLists.txt)$'
 
 # Get user preferences
 TRAILING_WHITESPACE_FILES=$(git config hooks.whitespace.trailing)