mastodon/.rubocop.yml

# Can be removed once all rules are addressed or moved to this file as documented overrides
inherit_from: .rubocop_todo.yml

# Used for merging with exclude lists with .rubocop_todo.yml
inherit_mode:
  merge:
    - Exclude

require:
  - rubocop-rails
  - rubocop-rspec
  - rubocop-performance
  - rubocop-capybara
  - ./lib/linter/rubocop_middle_dot

AllCops:
  TargetRubyVersion: 3.0 # Set to minimum supported version of CI
  DisplayCopNames: true
  DisplayStyleGuide: true
  ExtraDetails: true
  UseCache: true
  CacheRootDirectory: tmp
  NewCops: enable # Opt-in to newly added rules
  Exclude:
    - db/schema.rb
    - 'bin/*'
    - 'node_modules/**/*'
    - 'Vagrantfile'
    - 'vendor/**/*'
    - 'config/initializers/json_ld*' # Generated files
    - 'lib/mastodon/migration_helpers.rb' # Vendored from GitLab
    - 'lib/templates/**/*'

# Reason: Prefer Hashes without extreme indentation
# https://docs.rubocop.org/rubocop/cops_layout.html#layoutfirsthashelementindentation
Layout/FirstHashElementIndentation:
  EnforcedStyle: consistent

# Reason: Currently disabled in .rubocop_todo.yml
# https://docs.rubocop.org/rubocop/cops_layout.html#layoutlinelength
Layout/LineLength:
  Max: 320 # Default of 120 causes a duplicate entry in generated todo file

# Reason:
# https://docs.rubocop.org/rubocop/cops_lint.html#lintuselessaccessmodifier
Lint/UselessAccessModifier:
  ContextCreatingMethods:
    - class_methods

## Disable most Metrics/*Length cops
# Reason: those are often triggered and force significant refactors when this happend
#         but the team feel they are not really improving the code quality.

# https://docs.rubocop.org/rubocop/cops_metrics.html#metricsblocklength
Metrics/BlockLength:
  Enabled: false

# https://docs.rubocop.org/rubocop/cops_metrics.html#metricsclasslength
Metrics/ClassLength:
  Enabled: false

# https://docs.rubocop.org/rubocop/cops_metrics.html#metricsmethodlength
Metrics/MethodLength:
  Enabled: false

# https://docs.rubocop.org/rubocop/cops_metrics.html#metricsmodulelength
Metrics/ModuleLength:
  Enabled: false

## End Disable Metrics/*Length cops

# Reason: Currently disabled in .rubocop_todo.yml
# https://docs.rubocop.org/rubocop/cops_metrics.html#metricsabcsize
Metrics/AbcSize:
  Exclude:
    - 'lib/mastodon/cli/*.rb'

# Reason: Currently disabled in .rubocop_todo.yml
# https://docs.rubocop.org/rubocop/cops_metrics.html#metricscyclomaticcomplexity
Metrics/CyclomaticComplexity:
  Exclude:
    - lib/mastodon/cli/*.rb

# Reason:
# https://docs.rubocop.org/rubocop/cops_metrics.html#metricsparameterlists
Metrics/ParameterLists:
  CountKeywordArgs: false

# Reason: Prevailing style is argument file paths
# https://docs.rubocop.org/rubocop-rails/cops_rails.html#railsfilepath
Rails/FilePath:
  EnforcedStyle: arguments

# Reason: Prevailing style uses numeric status codes, matches RSpec/Rails/HttpStatus
# https://docs.rubocop.org/rubocop-rails/cops_rails.html#railshttpstatus
Rails/HttpStatus:
  EnforcedStyle: numeric

# Reason: Allowed in `tootctl` CLI code and in boot ENV checker
# https://docs.rubocop.org/rubocop-rails/cops_rails.html#railsexit
Rails/Exit:
  Exclude:
    - 'config/boot.rb'
    - 'lib/mastodon/cli/*.rb'

Rails/SkipsModelValidations:
  Exclude:
    - 'db/*migrate/**/*'

# Reason: We want to preserve the ability to migrate from arbitrary old versions,
# and cannot guarantee that every installation has run every migration as they upgrade.
# https://docs.rubocop.org/rubocop-rails/cops_rails.html#railsunusedignoredcolumns
Rails/UnusedIgnoredColumns:
  Enabled: false

# Reason: Prevailing style choice
# https://docs.rubocop.org/rubocop-rails/cops_rails.html#railsnegateinclude
Rails/NegateInclude:
  Enabled: false

# Reason: Deprecated cop, will be removed in 3.0, replaced by SpecFilePathFormat
# https://docs.rubocop.org/rubocop-rspec/cops_rspec.html#rspecfilepath
RSpec/FilePath:
  Enabled: false

# Reason:
# https://docs.rubocop.org/rubocop-rspec/cops_rspec.html#rspecnamedsubject
RSpec/NamedSubject:
  EnforcedStyle: named_only

# Reason: Prevailing style choice
# https://docs.rubocop.org/rubocop-rspec/cops_rspec.html#rspecnottonot
RSpec/NotToNot:
  EnforcedStyle: to_not

# Reason: Prevailing style uses numeric status codes, matches Rails/HttpStatus
# https://docs.rubocop.org/rubocop-rspec/cops_rspec_rails.html#rspecrailshttpstatus
RSpec/Rails/HttpStatus:
  EnforcedStyle: numeric

# Reason: Match overrides from Rspec/FilePath rule above
# https://docs.rubocop.org/rubocop-rspec/cops_rspec.html#rspecspecfilepathformat
RSpec/SpecFilePathFormat:
  CustomTransform:
    ActivityPub: activitypub
    DeepL: deepl
    FetchOEmbedService: fetch_oembed_service
    OEmbedController: oembed_controller
    OStatus: ostatus

# Reason:
# https://docs.rubocop.org/rubocop/cops_style.html#styleclassandmodulechildren
Style/ClassAndModuleChildren:
  Enabled: false

# Reason: Classes mostly self-document with their names
# https://docs.rubocop.org/rubocop/cops_style.html#styledocumentation
Style/Documentation:
  Enabled: false

# Reason: Enforce modern Ruby style
# https://docs.rubocop.org/rubocop/cops_style.html#stylehashsyntax
Style/HashSyntax:
  EnforcedStyle: ruby19_no_mixed_keys

# Reason:
# https://docs.rubocop.org/rubocop/cops_style.html#stylenumericliterals
Style/NumericLiterals:
  AllowedPatterns:
    - \d{4}_\d{2}_\d{2}_\d{6} # For DB migration date version number readability

# Reason:
# https://docs.rubocop.org/rubocop/cops_style.html#stylepercentliteraldelimiters
Style/PercentLiteralDelimiters:
  PreferredDelimiters:
    '%i': '()'
    '%w': '()'

# Reason: Prefer less indentation in conditional assignments
# https://docs.rubocop.org/rubocop/cops_style.html#styleredundantbegin
Style/RedundantBegin:
  Enabled: false

# Reason: Overridden to reduce implicit StandardError rescues
# https://docs.rubocop.org/rubocop/cops_style.html#stylerescuestandarderror
Style/RescueStandardError:
  EnforcedStyle: implicit

# Reason: Simplify some spec layouts
# https://docs.rubocop.org/rubocop/cops_style.html#stylesemicolon
Style/Semicolon:
  AllowAsExpressionSeparator: true

# Reason: Originally disabled for CodeClimate, and no config consensus has been found
# https://docs.rubocop.org/rubocop/cops_style.html#stylesymbolarray
Style/SymbolArray:
  Enabled: false

# Reason:
# https://docs.rubocop.org/rubocop/cops_style.html#styletrailingcommainarrayliteral
Style/TrailingCommaInArrayLiteral:
  EnforcedStyleForMultiline: 'comma'

# Reason:
# https://docs.rubocop.org/rubocop/cops_style.html#styletrailingcommainhashliteral
Style/TrailingCommaInHashLiteral:
  EnforcedStyleForMultiline: 'comma'

Style/MiddleDot:
  Enabled: true