Add Rubocop

.rubocop.yml

@@ -0,0 +1,4 @@
+AllCops:
+  TargetRubyVersion: 2.3
+  Exclude:
+    - 'spec/dummy/**/*'

Gemfile.lock

@@ -45,6 +45,7 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     arel (8.0.0)
+    ast (2.3.0)
     builder (3.2.3)
     coderay (1.1.2)
     concurrent-ruby (1.0.5)
@@ -67,6 +68,10 @@ GEM
     nio4r (2.1.0)
     nokogiri (1.8.1)
       mini_portile2 (~> 2.3.0)
+    parallel (1.12.1)
+    parser (2.4.0.2)
+      ast (~> 2.3)
+    powerpack (0.1.1)
     pry (0.9.12.6)
       coderay (~> 1.0)
       method_source (~> 0.8)
@@ -100,6 +105,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
+    rainbow (3.0.0)
     rake (12.3.0)
     rspec-core (3.7.0)
       rspec-support (~> 3.7.0)
@@ -118,6 +124,14 @@ GEM
       rspec-mocks (~> 3.7.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.0)
+    rubocop (0.52.1)
+      parallel (~> 1.10)
+      parser (>= 2.4.0.2, < 3.0)
+      powerpack (~> 0.1)
+      rainbow (>= 2.2.2, < 4.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (~> 1.0, >= 1.0.1)
+    ruby-progressbar (1.9.0)
     slop (3.6.0)
     sprockets (3.7.1)
       concurrent-ruby (~> 1.0)
@@ -131,6 +145,7 @@ GEM
     thread_safe (0.3.6)
     tzinfo (1.2.4)
       thread_safe (~> 0.1)
+    unicode-display_width (1.3.0)
     websocket-driver (0.6.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
@@ -144,7 +159,8 @@ DEPENDENCIES
   puma (~> 3.11.0)
   rake (~> 12.3.0)
   rspec-rails (~> 3.7.2)
+  rubocop (~> 0.52.1)
   sqlite3 (~> 1.3.13)
 
 BUNDLED WITH
-   1.16.0
+   1.16.1

calligraphy.gemspec

@@ -23,5 +23,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'puma', '~> 3.11.0'
   s.add_development_dependency 'rake', '~> 12.3.0'
   s.add_development_dependency 'rspec-rails', '~> 3.7.2'
+  s.add_development_dependency 'rubocop', '~> 0.52.1'
   s.add_development_dependency 'sqlite3', '~> 1.3.13'
 end