gem: adopt frozen string literals

.rubocop.yml

@@ -53,9 +53,6 @@ Style/Documentation:
 Style/FormatStringToken:
   Enabled: false
 
-Style/FrozenStringLiteralComment:
-  Enabled: false
-
 Style/GuardClause:
   Enabled: false
 

CHANGELOG.md

@@ -5,6 +5,7 @@
 IMPROVEMENTS:
 
 - Refactor gemspec based on [recommendations](https://piotrmurach.com/articles/writing-a-ruby-gem-specification/) so tests are now excluded from gem and binaries move to `./exe` directory
+- Adopt Ruby 2.3 frozen string literals for source code potentially reducing memory consumption
 
 ## 2.1.1 (March 1, 2020)
 

Gemfile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gemspec

Rakefile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 require 'rubocop/rake_task'

dyndnsd.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 require_relative 'lib/dyndnsd/version'
 

exe/dyndnsd

@@ -1,3 +1,5 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'dyndnsd'
 

lib/dyndnsd.rb

@@ -1,4 +1,4 @@
-#!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require 'etc'
 require 'logger'

lib/dyndnsd/database.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 require 'forwardable'
 

lib/dyndnsd/generator/bind.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 module Dyndnsd
   module Generator

lib/dyndnsd/helper.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 require 'ipaddr'
 

lib/dyndnsd/responder/dyndns_style.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 module Dyndnsd
   module Responder

lib/dyndnsd/responder/rest_style.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 module Dyndnsd
   module Responder

lib/dyndnsd/textfile_reporter.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 # Adapted from https://github.com/eric/metriks-graphite/blob/master/lib/metriks/reporter/graphite.rb
 

lib/dyndnsd/updater/command_with_bind_zone.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 module Dyndnsd
   module Updater

lib/dyndnsd/version.rb

@@ -1,4 +1,5 @@
+# frozen_string_literal: true
 
 module Dyndnsd
-  VERSION = '2.1.1'.freeze
+  VERSION = '2.1.1'
 end

spec/daemon_spec.rb

@@ -1,4 +1,6 @@
-require 'spec_helper'
+# frozen_string_literal: true
+
+require_relative 'spec_helper'
 
 describe Dyndnsd::Daemon do
   include Rack::Test::Methods

spec/spec_helper.rb

@@ -1,8 +1,10 @@
+# frozen_string_literal: true
 
 require 'rubygems'
 require 'bundler/setup'
 require 'rack/test'
 
 require 'dyndnsd'
-require 'support/dummy_database'
-require 'support/dummy_updater'
+
+require_relative 'support/dummy_database'
+require_relative 'support/dummy_updater'

spec/support/dummy_database.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 require 'forwardable'
 

spec/support/dummy_updater.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 module Dyndnsd
   module Updater