Extract strategies for detecting the language

lib/linguist/strategy/classifier.rb

@@ -0,0 +1,12 @@
+module Linguist
+  module Strategy
+    class Classifier
+      def self.call(blob, languages)
+        Linguist::Classifier.classify(Samples.cache, blob.data, possible_language_names).map do |name|
+          # Return the actual Language object based of the string language name (i.e., first element of `#classify`)
+          Language[name]
+        end
+      end
+    end
+  end
+end

lib/linguist/strategy/filename.rb

@@ -1,7 +1,7 @@
 module Linguist
   module Strategy
     class Filename
-      def call(blob)
+      def self.call(blob, _)
         name = blob.name.to_s
 
         # A bit of an elegant hack. If the file is executable but extensionless,
@@ -13,7 +13,7 @@ module Linguist
         end
 
         # First try to find languages that match based on filename.
-        possible_languages = Language.find_by_filename(name)
+        Language.find_by_filename(name)
       end
     end
   end

lib/linguist/strategy/shebang.rb

@@ -0,0 +1,9 @@
+module Linguist
+  module Strategy
+    class Shebang
+      def self.call(blob, _)
+        Language.find_by_shebang(blob.data)
+      end
+    end
+  end
+end