.rubocop.yml

require: rubocop-rspec

AllCops:
  TargetRubyVersion: 2.1
  # Cop names are not displayed in offense messages by default. Change behavior
  # by overriding DisplayCopNames, or by giving the -D/--display-cop-names
  # option.
  DisplayCopNames: true
  # Style guide URLs are not displayed in offense messages by default. Change
  # behavior by overriding DisplayStyleGuide, or by giving the
  # -S/--display-style-guide option.
  DisplayStyleGuide: false
  # Exclude some GitLab files
  Exclude:
    - 'vendor/**/*'
    - 'db/**/*'
    - 'tmp/**/*'
    - 'bin/**/*'
    - 'lib/backup/**/*'
    - 'lib/ci/backup/**/*'
    - 'lib/tasks/**/*'
    - 'lib/ci/migrate/**/*'
    - 'lib/email_validator.rb'
    - 'lib/gitlab/upgrader.rb'
    - 'lib/gitlab/seeder.rb'
    - 'generator_templates/**/*'


##################### Style ##################################

# Check indentation of private/protected visibility modifiers.
Style/AccessModifierIndentation:
  Enabled: true

# Check the naming of accessor methods for get_/set_.
Style/AccessorMethodName:
  Enabled: false

# Use alias_method instead of alias.
Style/Alias:
  EnforcedStyle: prefer_alias_method
  Enabled: true

# Align the elements of an array literal if they span more than one line.
Style/AlignArray:
  Enabled: true

# Align the elements of a hash literal if they span more than one line.
Style/AlignHash:
  Enabled: true

# Align the parameters of a method call if they span more than one line.
Style/AlignParameters:
  Enabled: false

# Use &&/|| instead of and/or.
Style/AndOr:
  Enabled: false

# Use `Array#join` instead of `Array#*`.
Style/ArrayJoin:
  Enabled: false

# Use only ascii symbols in comments.
Style/AsciiComments:
  Enabled: true

# Use only ascii symbols in identifiers.
Style/AsciiIdentifiers:
  Enabled: true

# Checks for uses of Module#attr.
Style/Attr:
  Enabled: false

# Avoid the use of BEGIN blocks.
Style/BeginBlock:
  Enabled: true

# Checks if usage of %() or %Q() matches configuration.
Style/BarePercentLiterals:
  Enabled: false

# Do not use block comments.
Style/BlockComments:
  Enabled: false

# Put end statement of multiline block on its own line.
Style/BlockEndNewline:
  Enabled: true

# Avoid using {...} for multi-line blocks (multiline chaining is # always
# ugly). Prefer {...} over do...end for single-line blocks.
Style/BlockDelimiters:
  Enabled: true

# Enforce braces style around hash parameters.
Style/BracesAroundHashParameters:
  Enabled: false

# Avoid explicit use of the case equality operator(===).
Style/CaseEquality:
  Enabled: false

# Indentation of when in a case/when/[else/]end.
Style/CaseIndentation:
  Enabled: true

# Checks for uses of character literals.
Style/CharacterLiteral:
  Enabled: true

# Use CamelCase for classes and modules.'
Style/ClassAndModuleCamelCase:
  Enabled: true

# Checks style of children classes and modules.
Style/ClassAndModuleChildren:
  Enabled: false

# Enforces consistent use of `Object#is_a?` or `Object#kind_of?`.
Style/ClassCheck:
  Enabled: false

# Use self when defining module/class methods.
Style/ClassMethods:
  Enabled: false

# Avoid the use of class variables.
Style/ClassVars:
  Enabled: true

# Do not use :: for method call.
Style/ColonMethodCall:
  Enabled: false

# Checks formatting of special comments (TODO, FIXME, OPTIMIZE, HACK, REVIEW).
Style/CommentAnnotation:
  Enabled: false

# Indentation of comments.
Style/CommentIndentation:
  Enabled: true

# Use the return value of `if` and `case` statements for assignment to a
# variable and variable comparison instead of assigning that variable
# inside of each branch.
Style/ConditionalAssignment:
  Enabled: false

# Constants should use SCREAMING_SNAKE_CASE.
Style/ConstantName:
  Enabled: true

# Use def with parentheses when there are arguments.
Style/DefWithParentheses:
  Enabled: true

# Checks for use of deprecated Hash methods.
Style/DeprecatedHashMethods:
  Enabled: false

# Document classes and non-namespace modules.
Style/Documentation:
  Enabled: false

# Checks the position of the dot in multi-line method calls.
Style/DotPosition:
  Enabled: false

# Checks for uses of double negation (!!).
Style/DoubleNegation:
  Enabled: false

# Prefer `each_with_object` over `inject` or `reduce`.
Style/EachWithObject:
  Enabled: false

# Align elses and elsifs correctly.
Style/ElseAlignment:
  Enabled: true

# Avoid empty else-clauses.
Style/EmptyElse:
  Enabled: false

# Use empty lines between defs.
Style/EmptyLineBetweenDefs:
  Enabled: false

# Don't use several empty lines in a row.
Style/EmptyLines:
  Enabled: false

# Keep blank lines around access modifiers.
Style/EmptyLinesAroundAccessModifier:
  Enabled: false

# Keeps track of empty lines around block bodies.
Style/EmptyLinesAroundBlockBody:
  Enabled: false

# Keeps track of empty lines around class bodies.
Style/EmptyLinesAroundClassBody:
  Enabled: false

# Keeps track of empty lines around module bodies.
Style/EmptyLinesAroundModuleBody:
  Enabled: false

# Keeps track of empty lines around method bodies.
Style/EmptyLinesAroundMethodBody:
  Enabled: false

# Prefer literals to Array.new/Hash.new/String.new.
Style/EmptyLiteral:
  Enabled: false

# Avoid the use of END blocks.
Style/EndBlock:
  Enabled: false

# Use Unix-style line endings.
Style/EndOfLine:
  Enabled: false

# Favor the use of Fixnum#even? && Fixnum#odd?
Style/EvenOdd:
  Enabled: false

# Do not use unnecessary spacing.
Style/ExtraSpacing:
  Enabled: false

# Use snake_case for source file names.
Style/FileName:
  Enabled: false

# Checks for flip flops.
Style/FlipFlop:
  Enabled: false

# Checks use of for or each in multiline loops.
Style/For:
  Enabled: false

# Enforce the use of Kernel#sprintf, Kernel#format or String#%.
Style/FormatString:
  Enabled: false

# Do not introduce global variables.
Style/GlobalVars:
  Enabled: false

# Check for conditionals that can be replaced with guard clauses.
Style/GuardClause:
  Enabled: false

# Prefer Ruby 1.9 hash syntax `{ a: 1, b: 2 }`
# over 1.8 syntax `{ :a => 1, :b => 2 }`.
Style/HashSyntax:
  Enabled: true

# Finds if nodes inside else, which can be converted to elsif.
Style/IfInsideElse:
  Enabled: false

# Favor modifier if/unless usage when you have a single-line body.
Style/IfUnlessModifier:
  Enabled: false

# Do not use if x; .... Use the ternary operator instead.
Style/IfWithSemicolon:
  Enabled: false

# Checks that conditional statements do not have an identical line at the
# end of each branch, which can validly be moved out of the conditional.
Style/IdenticalConditionalBranches:
  Enabled: false

# Checks the indentation of the first line of the right-hand-side of a
# multi-line assignment.
Style/IndentAssignment:
  Enabled: false

# Keep indentation straight.
Style/IndentationConsistency:
  Enabled: true

# Use 2 spaces for indentation.
Style/IndentationWidth:
  Enabled: true

# Checks the indentation of the first element in an array literal.
Style/IndentArray:
  Enabled: false

# Checks the indentation of the first key in a hash literal.
Style/IndentHash:
  Enabled: false

# Use Kernel#loop for infinite loops.
Style/InfiniteLoop:
  Enabled: true

# Use the new lambda literal syntax for single-line blocks.
Style/Lambda:
  Enabled: false

# Use lambda.call(...) instead of lambda.(...).
Style/LambdaCall:
  Enabled: false

# Comments should start with a space.
Style/LeadingCommentSpace:
  Enabled: false

# Use \ instead of + or << to concatenate two string literals at line end.
Style/LineEndConcatenation:
  Enabled: false

# Do not use parentheses for method calls with no arguments.
Style/MethodCallParentheses:
  Enabled: false

# Checks if the method definitions have or don't have parentheses.
Style/MethodDefParentheses:
  Enabled: false

# Use the configured style when naming methods.
Style/MethodName:
  Enabled: false

# Checks for usage of `extend self` in modules.
Style/ModuleFunction:
  Enabled: false

# Checks that the closing brace in an array literal is either on the same line
# as the last array element, or a new line.
Style/MultilineArrayBraceLayout:
  Enabled: false
  EnforcedStyle: symmetrical

# Avoid multi-line chains of blocks.
Style/MultilineBlockChain:
  Enabled: false

# Ensures newlines after multiline block do statements.
Style/MultilineBlockLayout:
  Enabled: true

# Checks that the closing brace in a hash literal is either on the same line as
# the last hash element, or a new line.
Style/MultilineHashBraceLayout:
  Enabled: false
  EnforcedStyle: symmetrical

# Do not use then for multi-line if/unless.
Style/MultilineIfThen:
  Enabled: false

# Checks that the closing brace in a method call is either on the same line as
# the last method argument, or a new line.
Style/MultilineMethodCallBraceLayout:
  Enabled: false
  EnforcedStyle: symmetrical

# Checks indentation of method calls with the dot operator that span more than
# one line.
Style/MultilineMethodCallIndentation:
  Enabled: false

# Checks indentation of binary operations that span more than one line.
Style/MultilineOperationIndentation:
  Enabled: false

# Avoid multi-line `? :` (the ternary operator), use if/unless instead.
Style/MultilineTernaryOperator:
  Enabled: false

# Do not assign mutable objects to constants.
Style/MutableConstant:
  Enabled: false

# Favor unless over if for negative conditions (or control flow or).
Style/NegatedIf:
  Enabled: false

# Favor until over while for negative conditions.
Style/NegatedWhile:
  Enabled: false

# Avoid using nested modifiers.
Style/NestedModifier:
  Enabled: false

# Parenthesize method calls which are nested inside the argument list of
# another parenthesized method call.
Style/NestedParenthesizedCalls:
  Enabled: false

# Use one expression per branch in a ternary operator.
Style/NestedTernaryOperator:
  Enabled: true

# Use `next` to skip iteration instead of a condition at the end.
Style/Next:
  Enabled: false

# Prefer x.nil? to x == nil.
Style/NilComparison:
  Enabled: true

# Checks for redundant nil checks.
Style/NonNilCheck:
  Enabled: true

# Use ! instead of not.
Style/Not:
  Enabled: true

# Add underscores to large numeric literals to improve their readability.
Style/NumericLiterals:
  Enabled: false

# Favor the ternary operator(?:) over if/then/else/end constructs.
Style/OneLineConditional:
  Enabled: true

# When defining binary operators, name the argument other.
Style/OpMethod:
  Enabled: false

# Check for simple usages of parallel assignment. It will only warn when
# the number of variables matches on both sides of the assignment.
Style/ParallelAssignment:
  Enabled: false

# Don't use parentheses around the condition of an if/unless/while.
Style/ParenthesesAroundCondition:
  Enabled: true

# Use `%`-literal delimiters consistently.
Style/PercentLiteralDelimiters:
  Enabled: false

# Checks if uses of %Q/%q match the configured preference.
Style/PercentQLiterals:
  Enabled: false

# Avoid Perl-style regex back references.
Style/PerlBackrefs:
  Enabled: false

# Check the names of predicate methods.
Style/PredicateName:
  Enabled: false

# Use proc instead of Proc.new.
Style/Proc:
  Enabled: false

# Checks the arguments passed to raise/fail.
Style/RaiseArgs:
  Enabled: false

# Don't use begin blocks when they are not needed.
Style/RedundantBegin:
  Enabled: false

# Checks for an obsolete RuntimeException argument in raise/fail.
Style/RedundantException:
  Enabled: false

# Checks usages of Object#freeze on immutable objects.
Style/RedundantFreeze:
  Enabled: false

# TODO: Enable RedundantParentheses Cop.
# Checks for parentheses that seem not to serve any purpose.
Style/RedundantParentheses:
  Enabled: false

# Don't use return where it's not required.
Style/RedundantReturn:
  Enabled: true

# Don't use self where it's not needed.
Style/RedundantSelf:
  Enabled: false

# Use %r for regular expressions matching more than `MaxSlashes` '/'
# characters. Use %r only for regular expressions matching more
# than `MaxSlashes` '/' character.
Style/RegexpLiteral:
  Enabled: false

# Avoid using rescue in its modifier form.
Style/RescueModifier:
  Enabled: false

# Checks for places where self-assignment shorthand should have been used.
Style/SelfAssignment:
  Enabled: false

# Don't use semicolons to terminate expressions.
Style/Semicolon:
  Enabled: false

# Checks for proper usage of fail and raise.
Style/SignalException:
  Enabled: false

# Enforces the names of some block params.
Style/SingleLineBlockParams:
  Enabled: false

# Avoid single-line methods.
Style/SingleLineMethods:
  Enabled: false

# Use spaces after colons.
Style/SpaceAfterColon:
  Enabled: false

# Use spaces after commas.
Style/SpaceAfterComma:
  Enabled: false

# Do not put a space between a method name and the opening parenthesis in a
# method definition.
Style/SpaceAfterMethodName:
  Enabled: false

# Tracks redundant space after the ! operator.
Style/SpaceAfterNot:
  Enabled: false

# Use spaces after semicolons.
Style/SpaceAfterSemicolon:
  Enabled: false

# Checks that the equals signs in parameter default assignments have or don't
# have surrounding space depending on configuration.
Style/SpaceAroundEqualsInParameterDefault:
  Enabled: false

# Use a space around keywords if appropriate.
Style/SpaceAroundKeyword:
  Enabled: true

# Use a single space around operators.
Style/SpaceAroundOperators:
  Enabled: true

# Checks that the left block brace has or doesn't have space before it.
Style/SpaceBeforeBlockBraces:
  Enabled: false

# No spaces before commas.
Style/SpaceBeforeComma:
  Enabled: false

# Checks for missing space between code and a comment on the same line.
Style/SpaceBeforeComment:
  Enabled: false

# Checks that exactly one space is used between a method name and the first
# argument for method calls without parentheses.
Style/SpaceBeforeFirstArg:
  Enabled: false

# No spaces before semicolons.
Style/SpaceBeforeSemicolon:
  Enabled: false

# Checks that block braces have or don't have surrounding space.
# For blocks taking parameters, checks that the left brace has or doesn't
# have trailing space.
Style/SpaceInsideBlockBraces:
  Enabled: false

# No spaces after [ or before ].
Style/SpaceInsideBrackets:
  Enabled: false

# Use spaces inside hash literal braces - or don't.
Style/SpaceInsideHashLiteralBraces:
  Enabled: true

# No spaces after ( or before ).
Style/SpaceInsideParens:
  Enabled: false

# No spaces inside range literals.
Style/SpaceInsideRangeLiteral:
  Enabled: false

# Checks for padding/surrounding spaces inside string interpolation.
Style/SpaceInsideStringInterpolation:
  Enabled: false

# Avoid Perl-style global variables.
Style/SpecialGlobalVars:
  Enabled: false

# Check for the usage of parentheses around stabby lambda arguments.
Style/StabbyLambdaParentheses:
  Enabled: false

# Checks if uses of quotes match the configured preference.
Style/StringLiterals:
  Enabled: false

# Checks if uses of quotes inside expressions in interpolated strings match the
# configured preference.
Style/StringLiteralsInInterpolation:
  Enabled: false

# Checks if configured preferred methods are used over non-preferred.
Style/StringMethods:
  Enabled: false

# Use %i or %I for arrays of symbols.
Style/SymbolArray:
  Enabled: false

# Use symbols as procs instead of blocks when possible.
Style/SymbolProc:
  Enabled: false

# No hard tabs.
Style/Tab:
  Enabled: true

# Checks trailing blank lines and final newline.
Style/TrailingBlankLines:
  Enabled: true

# Checks for trailing comma in array and hash literals.
Style/TrailingCommaInLiteral:
  Enabled: false

# Checks for trailing comma in argument lists.
Style/TrailingCommaInArguments:
  Enabled: false

# Avoid trailing whitespace.
Style/TrailingWhitespace:
  Enabled: false

# Checks for the usage of unneeded trailing underscores at the end of
# parallel variable assignment.
Style/TrailingUnderscoreVariable:
  Enabled: false

# Prefer attr_* methods to trivial readers/writers.
Style/TrivialAccessors:
  Enabled: false

# Do not use unless with else. Rewrite these with the positive case first.
Style/UnlessElse:
  Enabled: false

# Checks for %W when interpolation is not needed.
Style/UnneededCapitalW:
  Enabled: false

# TODO: Enable UnneededInterpolation Cop.
# Checks for strings that are just an interpolated expression.
Style/UnneededInterpolation:
  Enabled: false

# Checks for %q/%Q when single quotes or double quotes would do.
Style/UnneededPercentQ:
  Enabled: false

# Don't interpolate global, instance and class variables directly in strings.
Style/VariableInterpolation:
  Enabled: false

# Use the configured style when naming variables.
Style/VariableName:
  Enabled: false

# Use when x then ... for one-line cases.
Style/WhenThen:
  Enabled: false

# Checks for redundant do after while or until.
Style/WhileUntilDo:
  Enabled: false

# Favor modifier while/until usage when you have a single-line body.
Style/WhileUntilModifier:
  Enabled: false

# Use %w or %W for arrays of words.
Style/WordArray:
  Enabled: false

# TODO: Enable ZeroLengthPredicate Cop.
# Use #empty? when testing for objects of length 0.
Style/ZeroLengthPredicate:
  Enabled: false


#################### Metrics ################################

# A calculated magnitude based on number of assignments,
# branches, and conditions.
Metrics/AbcSize:
  Enabled: true
  Max: 60

# Avoid excessive block nesting.
Metrics/BlockNesting:
  Enabled: true
  Max: 4

# Avoid classes longer than 100 lines of code.
Metrics/ClassLength:
  Enabled: false

# A complexity metric that is strongly correlated to the number
# of test cases needed to validate a method.
Metrics/CyclomaticComplexity:
  Enabled: true
  Max: 17

# Limit lines to 80 characters.
Metrics/LineLength:
  Enabled: false

# Avoid methods longer than 10 lines of code.
Metrics/MethodLength:
  Enabled: false

# Avoid modules longer than 100 lines of code.
Metrics/ModuleLength:
  Enabled: false

# Avoid parameter lists longer than three or four parameters.
Metrics/ParameterLists:
  Enabled: true
  Max: 8

# A complexity metric geared towards measuring complexity for a human reader.
Metrics/PerceivedComplexity:
  Enabled: true
  Max: 18


#################### Lint ################################

# Checks for ambiguous operators in the first argument of a method invocation
# without parentheses.
Lint/AmbiguousOperator:
  Enabled: false

# Checks for ambiguous regexp literals in the first argument of a method
# invocation without parentheses.
Lint/AmbiguousRegexpLiteral:
  Enabled: false

# Don't use assignment in conditions.
Lint/AssignmentInCondition:
  Enabled: false

# Align block ends correctly.
Lint/BlockAlignment:
  Enabled: false

# Default values in optional keyword arguments and optional ordinal arguments
# should not refer back to the name of the argument.
Lint/CircularArgumentReference:
  Enabled: true

# Checks for condition placed in a confusing position relative to the keyword.
Lint/ConditionPosition:
  Enabled: true

# Check for debugger calls.
Lint/Debugger:
  Enabled: true

# Align ends corresponding to defs correctly.
Lint/DefEndAlignment:
  Enabled: true

# Check for deprecated class method calls.
Lint/DeprecatedClassMethods:
  Enabled: true

# Check for duplicate method definitions.
Lint/DuplicateMethods:
  Enabled: false

# Check for duplicate keys in hash literals.
Lint/DuplicatedKey:
  Enabled: false

# Check for immutable argument given to each_with_object.
Lint/EachWithObjectArgument:
  Enabled: true

# Check for odd code arrangement in an else block.
Lint/ElseLayout:
  Enabled: true

# Checks for empty ensure block.
Lint/EmptyEnsure:
  Enabled: true

# Checks for empty string interpolation.
Lint/EmptyInterpolation:
  Enabled: false

# Align ends correctly.
Lint/EndAlignment:
  Enabled: true

# END blocks should not be placed inside method definitions.
Lint/EndInMethod:
  Enabled: true

# Do not use return in an ensure block.
Lint/EnsureReturn:
  Enabled: true

# The use of eval represents a serious security risk.
Lint/Eval:
  Enabled: true

# Catches floating-point literals too large or small for Ruby to represent.
Lint/FloatOutOfRange:
  Enabled: true

# The number of parameters to format/sprint must match the fields.
Lint/FormatParameterMismatch:
  Enabled: true

# Don't suppress exception.
Lint/HandleExceptions:
  Enabled: false

# Checks for adjacent string literals on the same line, which could better be
# represented as a single string literal.
Lint/ImplicitStringConcatenation:
  Enabled: true

# TODO: Enable IneffectiveAccessModifier Cop.
# Checks for attempts to use `private` or `protected` to set the visibility
# of a class method, which does not work.
Lint/IneffectiveAccessModifier:
  Enabled: false

# Checks for invalid character literals with a non-escaped whitespace
# character.
Lint/InvalidCharacterLiteral:
  Enabled: true

# Checks of literals used in conditions.
Lint/LiteralInCondition:
  Enabled: false

# Checks for literals used in interpolation.
Lint/LiteralInInterpolation:
  Enabled: true

# Use Kernel#loop with break rather than begin/end/until or begin/end/while
# for post-loop tests.
Lint/Loop:
  Enabled: false

# Do not use nested method definitions.
Lint/NestedMethodDefinition:
  Enabled: true

# Do not omit the accumulator when calling `next` in a `reduce`/`inject` block.
Lint/NextWithoutAccumulator:
  Enabled: true

# Checks for method calls with a space before the opening parenthesis.
Lint/ParenthesesAsGroupedExpression:
  Enabled: true

# Checks for `rand(1)` calls. Such calls always return `0` and most likely
# a mistake.
Lint/RandOne:
  Enabled: true

# Use parentheses in the method call to avoid confusion about precedence.
Lint/RequireParentheses:
  Enabled: true

# Avoid rescuing the Exception class.
Lint/RescueException:
  Enabled: true

# Do not use the same name as outer local variable for block arguments
# or block local variables.
Lint/ShadowingOuterLocalVariable:
  Enabled: false

# 'Checks for Object#to_s usage in string interpolation.
Lint/StringConversionInInterpolation:
  Enabled: false

# Do not use prefix `_` for a variable that is used.
Lint/UnderscorePrefixedVariableName:
  Enabled: true

# Checks for rubocop:disable comments that can be removed.
# Note: this cop is not disabled when disabling all cops.
# It must be explicitly disabled.
Lint/UnneededDisable:
  Enabled: false

# Checks for unused block arguments.
Lint/UnusedBlockArgument:
  Enabled: false

# Checks for unused method arguments.
Lint/UnusedMethodArgument:
  Enabled: false

# Unreachable code.
Lint/UnreachableCode:
  Enabled: true

# Checks for useless access modifiers.
Lint/UselessAccessModifier:
  Enabled: false

# Checks for useless assignment to a local variable.
Lint/UselessAssignment:
  Enabled: true

# Checks for comparison of something with itself.
Lint/UselessComparison:
  Enabled: true

# Checks for useless `else` in `begin..end` without `rescue`.
Lint/UselessElseWithoutRescue:
  Enabled: true

# Checks for useless setter call to a local variable.
Lint/UselessSetterCall:
  Enabled: true

# Possible use of operator/literal/variable in void context.
Lint/Void:
  Enabled: true


##################### Performance ############################

# Use `casecmp` rather than `downcase ==`.
Performance/Casecmp:
  Enabled: true

# Use `str.{start,end}_with?(x, ..., y, ...)` instead of
# `str.{start,end}_with?(x, ...) || str.{start,end}_with?(y, ...)`.
Performance/DoubleStartEndWith:
  Enabled: true

# TODO: Enable EndWith Cop.
# Use `end_with?` instead of a regex match anchored to the end of a string.
Performance/EndWith:
  Enabled: false

# Use `strip` instead of `lstrip.rstrip`.
Performance/LstripRstrip:
  Enabled: true

# Use `Range#cover?` instead of `Range#include?`.
Performance/RangeInclude:
  Enabled: true

# TODO: Enable RedundantBlockCall Cop.
# Use `yield` instead of `block.call`.
Performance/RedundantBlockCall:
  Enabled: false

# TODO: Enable RedundantMatch Cop.
# Use `=~` instead of `String#match` or `Regexp#match` in a context where the
# returned `MatchData` is not needed.
Performance/RedundantMatch:
  Enabled: false

# TODO: Enable RedundantMerge Cop.
# Use `Hash#[]=`, rather than `Hash#merge!` with a single key-value pair.
Performance/RedundantMerge:
  # Max number of key-value pairs to consider an offense
  MaxKeyValuePairs: 2
  Enabled: false

# Use `sort` instead of `sort_by { |x| x }`.
Performance/RedundantSortBy:
  Enabled: true

# Use `start_with?` instead of a regex match anchored to the beginning of a
# string.
Performance/StartWith:
  Enabled: true

# Use `tr` instead of `gsub` when you are replacing the same number of
# characters. Use `delete` instead of `gsub` when you are deleting
# characters.
Performance/StringReplacement:
  Enabled: true

# TODO: Enable TimesMap Cop.
# Checks for `.times.map` calls.
Performance/TimesMap:
  Enabled: false


##################### Rails ##################################

# Enables Rails cops.
Rails:
  Enabled: true

# Enforces consistent use of action filter methods.
Rails/ActionFilter:
  Enabled: true
  EnforcedStyle: action

# Checks the correct usage of date aware methods, such as `Date.today`,
# `Date.current`, etc.
Rails/Date:
  Enabled: false

# Prefer delegate method for delegations.
Rails/Delegate:
  Enabled: false

# Prefer `find_by` over `where.first`.
Rails/FindBy:
  Enabled: true

# Prefer `all.find_each` over `all.find`.
Rails/FindEach:
  Enabled: true

# Prefer has_many :through to has_and_belongs_to_many.
Rails/HasAndBelongsToMany:
  Enabled: true

# Checks for calls to puts, print, etc.
Rails/Output:
  Enabled: true

# Checks for incorrect grammar when using methods like `3.day.ago`.
Rails/PluralizationGrammar:
  Enabled: true

# Checks for `read_attribute(:attr)` and `write_attribute(:attr, val)`.
Rails/ReadWriteAttribute:
  Enabled: false

# Checks the arguments of ActiveRecord scopes.
Rails/ScopeArgs:
  Enabled: true

# Checks the correct usage of time zone aware methods.
# http://danilenko.org/2012/7/6/rails_timezones
Rails/TimeZone:
  Enabled: false

# Use validates :attribute, hash of validations.
Rails/Validation:
  Enabled: false

##################### RSpec ##################################

# Check that instances are not being stubbed globally.
RSpec/AnyInstance:
  Enabled: false

# Check that the first argument to the top level describe is the tested class or
# module.
RSpec/DescribeClass:
  Enabled: false

# Use `described_class` for tested class / module.
RSpec/DescribeMethod:
  Enabled: false

# Checks that the second argument to top level describe is the tested method
# name.
RSpec/DescribedClass:
  Enabled: false

# Checks for long example.
RSpec/ExampleLength:
  Enabled: false
  Max: 5

# Do not use should when describing your tests.
RSpec/ExampleWording:
  Enabled: false
  CustomTransform:
    be: is
    have: has
    not: does not
  IgnoredWords: []

# Checks the file and folder naming of the spec file.
RSpec/FilePath:
  Enabled: false
  CustomTransform:
    RuboCop: rubocop
    RSpec: rspec

# Checks if there are focused specs.
RSpec/Focus:
  Enabled: true

# Checks for the usage of instance variables.
RSpec/InstanceVariable:
  Enabled: false

# Checks for multiple top-level describes.
RSpec/MultipleDescribes:
  Enabled: false

# Enforces the usage of the same method on all negative message expectations.
RSpec/NotToNot:
  EnforcedStyle: not_to
  Enabled: false

# Prefer using verifying doubles over normal doubles.
RSpec/VerifiedDoubles:
  Enabled: false