Install rubocop && rubocop -a

.rubocop.yml

@@ -0,0 +1,62 @@
+AllCops:
+  Exclude:
+    - '**/**/*.pb.rb'
+    - "vendor/**/*"
+  DisplayCopNames: true
+  TargetRubyVersion: 2.4
+
+Style/AndOr:
+  EnforcedStyle: conditionals
+
+Style/AsciiComments:
+  Enabled: false
+
+Style/Documentation:
+  Enabled: false
+
+Style/DoubleNegation:
+  Enabled: false
+
+Style/EmptyElse:
+  EnforcedStyle: empty
+
+Style/FormatString:
+  EnforcedStyle: percent
+
+Style/IfUnlessModifier:
+  Enabled: false
+
+
+Style/PredicateName:
+  NamePrefixBlacklist:
+    - "is_"
+    - "have_"
+  NamePrefix:
+    - "is_"
+    - "have_"
+
+Style/SignalException:
+  EnforcedStyle: only_raise
+
+Style/SingleLineBlockParams:
+  Enabled: false
+
+Lint/UnderscorePrefixedVariableName:
+  Enabled: false
+
+##################### Metrics ##################################
+
+Metrics/AbcSize:
+  Max: 30
+
+Metrics/CyclomaticComplexity:
+  Max: 10
+
+Metrics/LineLength:
+  Max: 160
+
+Metrics/MethodLength:
+  Max: 20
+
+Metrics/PerceivedComplexity:
+  Max: 8

Gemfile

@@ -1,6 +1,8 @@
-source "https://rubygems.org"
+# frozen_string_literal: true
 
-git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+source 'https://rubygems.org'
+
+git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in grpc_kit.gemspec
 gemspec

Rakefile

@@ -1,6 +1,8 @@
-require "bundler/gem_tasks"
-require "rspec/core/rake_task"
+# frozen_string_literal: true
+
+require 'bundler/gem_tasks'
+require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new(:spec)
 
-task :default => :spec
+task default: :spec

bin/console

@@ -1,7 +1,8 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
-require "bundler/setup"
-require "grpc_kit"
+require 'bundler/setup'
+require 'grpc_kit'
 
 # You can add fixtures and/or initialization code here to make experimenting
 # with your gem easier. You can also use a different console, if you like.
@@ -10,5 +11,5 @@ require "grpc_kit"
 # require "pry"
 # Pry.start
 
-require "irb"
+require 'irb'
 IRB.start(__FILE__)

grpc_kit.gemspec

@@ -1,36 +1,38 @@
+# frozen_string_literal: true
 
-lib = File.expand_path("../lib", __FILE__)
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require "grpc_kit/version"
+require 'grpc_kit/version'
 
 Gem::Specification.new do |spec|
-  spec.name          = "grpc_kit"
+  spec.name          = 'grpc_kit'
   spec.version       = GrpcKit::VERSION
-  spec.authors       = ["ganmacs"]
-  spec.email         = ["ganmacs@gmail.com"]
+  spec.authors       = ['ganmacs']
+  spec.email         = ['ganmacs@gmail.com']
 
-  spec.summary       = "..."
-  spec.description   = "..."
-  spec.homepage      = "https://github.com/ganmacs/grpc_kit"
-  spec.license       = "MIT"
+  spec.summary       = '...'
+  spec.description   = '...'
+  spec.homepage      = 'https://github.com/ganmacs/grpc_kit'
+  spec.license       = 'MIT'
 
   # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
   # to allow pushing to a single host or delete this section to allow pushing to any host.
   if spec.respond_to?(:metadata)
-    spec.metadata["allowed_push_host"] = "TODO: Set to 'http://mygemserver.com'"
+    spec.metadata['allowed_push_host'] = "TODO: Set to 'http://mygemserver.com'"
   else
-    raise "RubyGems 2.0 or newer is required to protect against " \
-      "public gem pushes."
+    raise 'RubyGems 2.0 or newer is required to protect against ' \
+      'public gem pushes.'
   end
 
-  spec.files         = `git ls-files -z`.split("\x0").reject do |f|
+  spec.files = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})
   end
-  spec.bindir        = "exe"
+  spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
-  spec.require_paths = ["lib"]
+  spec.require_paths = ['lib']
 
-  spec.add_development_dependency "bundler", "~> 1.16"
-  spec.add_development_dependency "rake", "~> 10.0"
-  spec.add_development_dependency "rspec", "~> 3.0"
+  spec.add_development_dependency 'bundler', '~> 1.16'
+  spec.add_development_dependency 'rake', '~> 10.0'
+  spec.add_development_dependency 'rspec', '~> 3.0'
+  spec.add_development_dependency 'rubocop'
 end

lib/grpc_kit.rb

@@ -1,4 +1,6 @@
-require "grpc_kit/version"
+# frozen_string_literal: true
+
+require 'grpc_kit/version'
 
 module GrpcKit
   # Your code goes here...

lib/grpc_kit/version.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module GrpcKit
-  VERSION = "0.1.0"
+  VERSION = '0.1.0'
 end

spec/grpc_kit_spec.rb

@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 RSpec.describe GrpcKit do
-  it "has a version number" do
+  it 'has a version number' do
     expect(GrpcKit::VERSION).not_to be nil
   end
 
-  it "does something useful" do
+  it 'does something useful' do
     expect(false).to eq(true)
   end
 end

spec/spec_helper.rb

@@ -1,9 +1,11 @@
-require "bundler/setup"
-require "grpc_kit"
+# frozen_string_literal: true
+
+require 'bundler/setup'
+require 'grpc_kit'
 
 RSpec.configure do |config|
   # Enable flags like --only-failures and --next-failure
-  config.example_status_persistence_file_path = ".rspec_status"
+  config.example_status_persistence_file_path = '.rspec_status'
 
   # Disable RSpec exposing methods globally on `Module` and `main`
   config.disable_monkey_patching!