.rubocop.yml

require:
  - rubocop-rspec

AllCops:
  TargetRubyVersion: 2.7
  # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
  # to ignore them, so only the ones explicitly set in this file are enabled.
  DisabledByDefault: true

# Prefer &&/|| over and/or.
Style/AndOr:
  Enabled: true

# Align `when` with `case`.
Layout/CaseIndentation:
  Enabled: true

Layout/ClosingHeredocIndentation:
  Enabled: true

# Align comments with method definitions.
Layout/CommentIndentation:
  Enabled: true

Layout/ElseAlignment:
  Enabled: true

# Align `end` with the matching keyword or starting expression except for
# assignments, where it should be aligned with the LHS.
Layout/EndAlignment:
  Enabled: true
  EnforcedStyleAlignWith: variable
  AutoCorrect: true

Layout/EmptyLineAfterMagicComment:
  Enabled: true

Layout/EmptyLineAfterMultilineCondition:
  Enabled: true

Layout/EmptyLinesAroundAccessModifier:
  Enabled: true
  EnforcedStyle: only_before

Layout/EmptyLinesAroundBlockBody:
  Enabled: true

# In a regular class definition, no empty lines around the body.
Layout/EmptyLinesAroundClassBody:
  Enabled: true

# In a regular method definition, no empty lines around the body.
Layout/EmptyLinesAroundMethodBody:
  Enabled: true

# In a regular module definition, no empty lines around the body.
Layout/EmptyLinesAroundModuleBody:
  Enabled: true

# Use Ruby >= 1.9 syntax for hashes. Prefer { a: :b } over { :a => :b }.
Style/HashSyntax:
  Enabled: true

Layout/FirstArgumentIndentation:
  Enabled: true

# Method definitions after `private` or `protected` isolated calls need one
# extra level of indentation.
Layout/IndentationConsistency:
  Enabled: true
  EnforcedStyle: indented_internal_methods

# Detect hard tabs, no hard tabs.
Layout/IndentationStyle:
  Enabled: true

# Two spaces, no tabs (for indentation).
Layout/IndentationWidth:
  Enabled: true

Layout/LeadingCommentSpace:
  Enabled: true

Layout/SpaceAfterColon:
  Enabled: true

Layout/SpaceAfterComma:
  Enabled: true

Layout/SpaceAfterSemicolon:
  Enabled: true

Layout/SpaceAroundEqualsInParameterDefault:
  Enabled: true

Layout/SpaceAroundKeyword:
  Enabled: true

Layout/SpaceBeforeComma:
  Enabled: true

Layout/SpaceBeforeComment:
  Enabled: true

Layout/SpaceBeforeFirstArg:
  Enabled: true

Style/ClassMethodsDefinitions:
  Enabled: true
  EnforcedStyle: def_self

Style/DefWithParentheses:
  Enabled: true

# Defining a method with parameters needs parentheses.
Style/MethodDefParentheses:
  Enabled: true

Style/MethodCallWithArgsParentheses:
  Enabled: true
  IgnoredMethods:
    # Gemfile, gemspec
    - source
    - add_dependency
    - add_development_dependency

    # include/require
    - require
    - require_relative
    - include

    # fundamental methods
    - raise
    - sleep

    # RSpec
    - describe
    - it
    - to
    - not_to
    - be
    - eq

    # async/await
    - define_async_method
    - await
    - future

    # utils
    - debug_print
    - debug_puts

Style/MethodCallWithoutArgsParentheses:
  Enabled: true

Style/RedundantFreeze:
  Enabled: true

Style/RedundantSelf:
  Enabled: true

Style/RedundantSelfAssignment:
  Enabled: true

# Use `foo {}` not `foo{}`.
Layout/SpaceBeforeBlockBraces:
  Enabled: true

# Use `foo { bar }` not `foo {bar}`.
Layout/SpaceInsideBlockBraces:
  Enabled: true
  EnforcedStyleForEmptyBraces: space

# Use `{ a: 1 }` not `{a:1}`.
Layout/SpaceInsideHashLiteralBraces:
  Enabled: true

Layout/SpaceInsideParens:
  Enabled: true

# Empty lines should not have any spaces.
Layout/TrailingEmptyLines:
  Enabled: true

# No trailing whitespace.
Layout/TrailingWhitespace:
  Enabled: true

# Use quotes for string literals when they are enough.
Style/RedundantPercentQ:
  Enabled: true

Lint/AmbiguousOperator:
  Enabled: true

Lint/AmbiguousRegexpLiteral:
  Enabled: true

Lint/BinaryOperatorWithIdenticalOperands:
  Enabled: true

Lint/DeprecatedClassMethods:
  Enabled: true

Lint/DuplicateRescueException:
  Enabled: true

Lint/ErbNewArguments:
  Enabled: true

Lint/EmptyConditionalBody:
  Enabled: true

Lint/FloatComparison:
  Enabled: true

Lint/OutOfRangeRegexpRef:
  Enabled: true

Lint/RedundantStringCoercion:
  Enabled: true

# Use my_method(my_arg) not my_method( my_arg ) or my_method my_arg.
Lint/RequireParentheses:
  Enabled: true

Lint/SelfAssignment:
  Enabled: true

Lint/ShadowingOuterLocalVariable:
  Enabled: true

Lint/TopLevelReturnWithArgument:
  Enabled: true

Lint/UnreachableLoop:
  Enabled: true

Lint/UriEscapeUnescape:
  Enabled: true

Lint/UselessAssignment:
  Enabled: true

Style/ParenthesesAroundCondition:
  Enabled: true

Style/ExplicitBlockArgument:
  Enabled: true

Style/FrozenStringLiteralComment:
  Enabled: false

Style/GlobalStdStream:
  Enabled: true

Style/HashEachMethods:
  Enabled: true

Style/HashTransformKeys:
  Enabled: true

Style/HashTransformValues:
  Enabled: true

Style/RaiseArgs:
  Enabled: true
  EnforcedStyle: compact

Style/RedundantBegin:
  Enabled: true

Style/RedundantReturn:
  Enabled: true
  AllowMultipleReturnValues: true

Style/Semicolon:
  Enabled: true
  AllowAsExpressionSeparator: true

Style/StringConcatenation:
  Enabled: true

# Prefer Foo.method over Foo::method
Style/ColonMethodCall:
  Enabled: true

Style/TrivialAccessors:
  Enabled: false

Style/AccessModifierDeclarations:
  Enabled: true
  EnforcedStyle: inline

Style/ClassAndModuleChildren:
  EnforcedStyle: compact

Style/TrailingCommaInArguments:
  Enabled: true
  EnforcedStyleForMultiline: comma

Style/TrailingCommaInArrayLiteral:
  Enabled: true
  EnforcedStyleForMultiline: comma

Style/TrailingCommaInHashLiteral:
  Enabled: true
  EnforcedStyleForMultiline: comma

# rubocop-rspec

RSpec/EmptyLineAfterExampleGroup:
  Enabled: true

RSpec/EmptyLineAfterHook:
  Enabled: true

# bad: expect("success").to eq(result)
# good: expect(result).to eq("success")
RSpec/ExpectActual:
  Enabled: true

# bad: expect{ subject }.to change(Hoge, :count).by(1)
# good: expect{ subject }.to change{ Hoge.count }.by(1)
RSpec/ExpectChange:
  Enabled: true
  EnforcedStyle: block

RSpec/ExpectInHook:
  Enabled: true

RSpec/ImplicitBlockExpectation:
  Enabled: true

RSpec/InstanceVariable:
  Enabled: true

# bad: it_should_behave_like
# good: it_behaves_like
RSpec/ItBehavesLike:
  Enabled: true

RSpec/LeakyConstantDeclaration:
  Enabled: false

RSpec/LetSetup:
  Enabled: true

RSpec/MultipleSubjects:
  Enabled: true

RSpec/NestedGroups:
  Enabled: true
  Max: 4

RSpec/NotToNot:
  Enabled: true

RSpec/PredicateMatcher:
  Enabled: true

RSpec/ReceiveCounts:
  Enabled: true

RSpec/ReceiveNever:
  Enabled: true

RSpec/ReturnFromStub:
  Enabled: true
  EnforcedStyle: and_return

RSpec/SharedContext:
  Enabled: true

RSpec/SharedExamples:
  Enabled: true

RSpec/SingleArgumentMessageChain:
  Enabled: true

RSpec/VoidExpect:
  Enabled: true

RSpec/Yield:
  Enabled: true