Extract empty blob strategy

lib/linguist/language.rb

@@ -93,13 +93,13 @@ module Linguist
     end
 
     require 'linguist/strategy/filename'
+    require 'linguist/strategy/empty_blob'
     require 'linguist/strategy/shebang'
     require 'linguist/strategy/classifier'
+
     STRATEGIES = [
       Linguist::Strategy::Filename,
-      # Don't bother with binary contents or an empty file
-      lambda {|blob, langauges| [] if blob.data.nil? || blob.data == "" },
-      # Check if there's a shebang line and use that as authoritative
+      Linguist::Strategy::EmptyBlob,
       Linguist::Strategy::Shebang,
       Linguist::Heuristics,
       Linguist::Strategy::Classifier

lib/linguist/strategy/empty_blob.rb

@@ -0,0 +1,10 @@
+module Linguist
+  module Strategy
+    class EmptyBlob
+      def self.call(blob, langauges)
+        # Don't bother with binary contents or an empty file
+        [] if blob.data.nil? || blob.data == ""
+      end
+    end
+  end
+end

lib/linguist/strategy/shebang.rb

@@ -1,5 +1,6 @@
 module Linguist
   module Strategy
+    # Check if there's a shebang line and use that as authoritative
     class Shebang
       def self.call(blob, _)
         Language.find_by_shebang(blob.data)