Configure rubocops for linting

.rubocop.yml

@@ -0,0 +1,56 @@
+require:
+  - rubocop-minitest
+  - rubocop-packaging
+
+AllCops:
+  NewCops: enable
+  StyleGuideBaseURL: https://rubystyle.guide
+
+Bundler/OrderedGems: { Include: ['*.gemspec'] }
+
+# Documentation
+Style/Documentation:
+  Enabled: false
+
+# Allow more flexibility with string literals
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: single_quotes
+
+# Enforce dots on the next line for multi-line method calls
+Layout/DotPosition:
+  EnforcedStyle: trailing
+
+Layout/LineLength:
+  Max: 120
+
+# Enforce comma after the last item of a multiline array or hash
+Style/TrailingCommaInArrayLiteral:
+  EnforcedStyleForMultiline: comma
+
+Style/TrailingCommaInHashLiteral:
+  EnforcedStyleForMultiline: comma
+
+# Encourage the use of method call with args parentheses
+Style/MethodCallWithArgsParentheses:
+  Enabled: true
+  EnforcedStyle: require_parentheses
+
+# Allow guard clauses
+Style/GuardClause:
+  Enabled: true
+
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+Layout/EmptyLineAfterMagicComment:
+  Enabled: true
+
+# Exclude test files from BlockComments check
+Style/BlockComments:
+  Exclude:
+    - 'test/**/*'
+
+# Naming conventions
+Naming/PredicateName:
+  Enabled: true

ffi-icu.gemspec

@@ -17,20 +17,22 @@ Gem::Specification.new do |spec|
   spec.metadata["source_code_uri"] = spec.homepage
   spec.metadata["changelog_uri"] = "#{spec.homepage}/blob/master/CHANGELOG.md"
 
-  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        = "bin"
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
   spec.extra_rdoc_files = ["LICENSE", "README.md"]
-  spec.rdoc_options    = ["--charset=UTF-8"]
+  spec.rdoc_options = ["--charset=UTF-8"]
 
   spec.add_runtime_dependency "ffi", "~> 1.0", ">= 1.0.9"
   spec.add_runtime_dependency "bigdecimal", "~> 3.1"
 
   spec.add_development_dependency "rspec", "~> 3.9"
   spec.add_development_dependency "rake", ">= 12.3.3"
   spec.add_development_dependency "rubocop", "~> 1.60"
+  spec.add_development_dependency "rubocop-minitest", "~> 0.34.5"
+  spec.add_development_dependency "rubocop-packaging", "~> 0.5.2"
 end