enable frozen literals

lib/pygments.rb

@@ -1,3 +1,5 @@
+# coding: utf-8
+# frozen_string_literal: true
 require File.join(File.dirname(__FILE__), 'pygments/popen')
 require 'forwardable'
 

lib/pygments/lexer.rb

@@ -1,3 +1,5 @@
+# coding: utf-8
+# frozen_string_literal: true
 module Pygments
   class Lexer < Struct.new(:name, :aliases, :filenames, :mimetypes)
     @lexers          = []

lib/pygments/popen.rb

@@ -1,4 +1,6 @@
 # coding: utf-8
+# frozen_string_literal: true
+
 require 'open3'
 require 'multi_json'
 require 'timeout'
@@ -371,9 +373,7 @@ def handle_header_and_return(header, id)
     # id, with two padding also. This means we are sending over the 8 characters +
     # code + 8 characters.
     def add_ids(code, id)
-      code.freeze
-      code = id + "  #{code}  #{id}"
-      code
+      (id + "  #{code}  #{id}").freeze
     end
 
     # Write data to mentos, the Python process.

lib/pygments/version.rb

@@ -1,3 +1,5 @@
+# coding: utf-8
+# frozen_string_literal: true
 module Pygments
   VERSION = '1.1.0'
 end

test/test_pygments.rb

@@ -1,4 +1,5 @@
-#coding: utf-8
+# coding: utf-8
+# frozen_string_literal: true
 
 require 'test/unit'
 require File.join(File.dirname(__FILE__), '..', '/lib/pygments.rb')