Fix md5 nesting

lib/linguist/md5.rb

@@ -11,40 +11,28 @@ module Linguist
     # Returns String hex digest
     def self.hexdigest(obj)
       digest = Digest::MD5.new
-      digest_strings(obj).each { |e| digest.update(e) }
-      digest.hexdigest
-    end
 
-    # Internal: Get String representations for digest.
-    #
-    # obj - Object to digest
-    #
-    # Returns an Array of Strings.
-    def self.digest_strings(obj)
       case obj
-      when String
-        ["#{obj.class}", "#{obj}"]
-      when Symbol
-        ["#{obj.class}", "#{obj}"]
-      when Integer
-        ["#{obj.class}", "#{obj}"]
+      when String, Symbol, Integer
+        digest.update "#{obj.class}"
+        digest.update "#{obj}"
       when TrueClass, FalseClass, NilClass
-        ["#{obj.class}"]
+        digest.update "#{obj.class}"
       when Array
-        r = ["#{obj.class}"]
-        obj.each do |e|
-          r.concat(digest_strings(e))
+        digest.update "#{obj.class}"
+        for e in obj
+          digest.update(hexdigest(e))
         end
-        r
       when Hash
-        r = ["#{obj.class}"]
-        obj.map { |k, v| digest_strings([k, v]) }.sort.each do |e|
-          r.concat(digest_strings(e))
+        digest.update "#{obj.class}"
+        for e in obj.map { |(k, v)| hexdigest([k, v]) }.sort
+          digest.update(e)
         end
-        r
       else
         raise TypeError, "can't convert #{obj.inspect} into String"
       end
+
+      digest.hexdigest
     end
   end
 end