XCode and Visual Studio project detection in seperate methods

lib/linguist/blob_helper.rb

@@ -171,6 +171,7 @@ module Linguist
     #
     # Includes:
     # - XCode project XML files
+    # - Visual Studio project XNL files
     # - Minified JavaScript
     #
     # Please add additional test coverage to
@@ -178,7 +179,7 @@ module Linguist
     #
     # Return true or false
     def generated?
-      if ['.xib', '.nib', '.pbxproj', '.xcworkspacedata', '.xcuserstate', '.csproj', '.dbproj', '.fsproj', '.pyproj', '.rbproj', '.vbproj', '.vcxproj', '.wixproj', '.resx', '.sln', '.vdproj', '.isproj'].include?(extname)
+      if xcode_project_file? || visual_studio_project_file?
         true
       elsif generated_coffeescript? || minified_javascript?
         true
@@ -187,6 +188,36 @@ module Linguist
       end
     end
 
+    # Internal: Is the blob an XCode project file?
+    #
+    # Generated if the file extension is an XCode project
+    # file extension.
+    #
+    # Returns true of false.
+
+    def xcode_project_file?
+      if ['.xib', '.nib', '.pbxproj', '.xcworkspacedata', '.xcuserstate'].include?(extname)
+        true
+      else
+        false
+      end
+    end
+
+    # Internal: Is the blob a Visual Studio project file?
+    #
+    # Generated if the file extension is a Visual Studio project
+    # file extension.
+    #
+    # Returns true of false.
+
+    def visual_studio_project_file?
+      if ['.csproj', '.dbproj', '.fsproj', '.pyproj', '.rbproj', '.vbproj', '.vcxproj', '.wixproj', '.resx', '.sln', '.vdproj', '.isproj'].include?(extname)
+        true
+      else
+        false
+      end
+    end
+
     # Internal: Is the blob minified JS?
     #
     # Consider JS minified if the average line length is