gems: add Rubocop gem.

.rubocop.yml

@@ -2,7 +2,7 @@ require:
   - rubocop-rails
 
 AllCops:
-  TargetRubyVersion: 2.6.5
+  TargetRubyVersion: 2.7.0
   Exclude:
     - "bin/*"
     - "node_modules/**/*"
@@ -46,9 +46,6 @@ Naming/MethodParameterName:
 Style/AsciiComments:
   Enabled: false
 
-Style/BracesAroundHashParameters:
-  EnforcedStyle: context_dependent
-
 Style/CommentAnnotation:
   Enabled: false
 

Gemfile

@@ -60,6 +60,8 @@ group :production do
 end
 
 group :development do
+  gem 'rubocop'
+  gem 'rubocop-rails'
   gem 'sinatra'
   gem 'meta_request'
   gem 'rack-mini-profiler'

Gemfile.lock

@@ -74,6 +74,7 @@ GEM
       public_suffix (>= 2.0.2, < 5.0)
     airbrussh (1.4.0)
       sshkit (>= 1.6.1, != 1.7.0)
+    ast (2.4.0)
     aws-eventstream (1.1.0)
     aws-partitions (1.308.0)
     aws-sdk-core (3.94.0)
@@ -171,6 +172,7 @@ GEM
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     ipaddress (0.8.3)
+    jaro_winkler (1.5.4)
     jmespath (1.4.0)
     jquery-rails (4.3.5)
       rails-dom-testing (>= 1, < 3)
@@ -245,6 +247,9 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
+    parallel (1.19.1)
+    parser (2.7.1.2)
+      ast (~> 2.4.0)
     pg (1.2.3)
     pg (1.2.3-x64-mingw32)
     pry (0.13.1)
@@ -297,6 +302,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.20.3, < 2.0)
+    rainbow (3.0.0)
     raindrops (0.19.1)
     rake (13.0.1)
     rakismet (1.5.4)
@@ -313,6 +319,20 @@ GEM
       actionpack (>= 5.0)
       railties (>= 5.0)
     retriable (3.1.2)
+    rexml (3.2.4)
+    rubocop (0.82.0)
+      jaro_winkler (~> 1.5.1)
+      parallel (~> 1.10)
+      parser (>= 2.7.0.1)
+      rainbow (>= 2.2.2, < 4.0)
+      rexml
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 2.0)
+    rubocop-rails (2.5.2)
+      activesupport
+      rack (>= 1.1)
+      rubocop (>= 0.72.0)
+    ruby-progressbar (1.10.1)
     ruby-vips (2.0.17)
       ffi (~> 1.9)
     ruby2_keywords (0.0.2)
@@ -367,6 +387,7 @@ GEM
       unf_ext
     unf_ext (0.0.7.7)
     unf_ext (0.0.7.7-x64-mingw32)
+    unicode-display_width (1.7.0)
     unicorn (5.5.5)
       kgio (~> 2.6)
       raindrops (~> 0.7)
@@ -449,6 +470,8 @@ DEPENDENCIES
   request_store
   responders
   retriable
+  rubocop
+  rubocop-rails
   ruby-vips
   rubyzip
   sanitize

bin/rubocop

@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'rubocop' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("../bundle", __FILE__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rubocop", "rubocop")