CHANGELOG.md

Main

Breaking

• SwiftLint now requires Swift 5.7 or higher to build.
  JP Simard

• Exclude weak_delegate rule from autocorrection due to behavioral changes leading to potential undefined behavior or bugs.
  SimplyDanny #3577

• The anyobject_protocol rule is now deprecated and will be completely removed in a future release because it is now handled by the Swift compiler.
  JP Simard

Experimental

• None.

Enhancements

• SwiftSyntax libraries have been updated from the previous 5.6 release and now use the new parser written in Swift. Swift 5.7+ features should now be parsed more accurately. We've also measured an improvement in lint times of up to 15%. This should also fix some deployment issues where the exact version of the internal SwiftSyntax parser needed to be available. If you notice any unexpected changes to lint results, please file an issue on the SwiftLint issue tracker. We can look into it and if it's a SwiftSyntax parser regression we can re-file it upstream.
  JP Simard #4031

• Add ability to filter rules for generate-docs subcommand.
  kattouf

• Add new excludes_trivial_init configuration for missing_docs rule to exclude initializers without any parameters.
  Marcelo Fabri #4107

• Rewrite some rules with SwiftSyntax, fixing some false positives and catching more violations:

  • anonymous_argument_in_multiline_closure
  • array_init
  • attributes
  • block_based_kvo
  • class_delegate_protocol
  • closing_brace
  • closure_parameter_position
  • computed_accessors_order
  • contains_over_filter_count
  • contains_over_filter_is_empty
  • contains_over_range_nil_comparison
  • deployment_target
  • discouraged_object_literal
  • discouraged_optional_boolean
  • duplicate_enum_cases
  • dynamic_inline
  • empty_collection_literal
  • empty_enum_arguments
  • empty_parameters
  • empty_parentheses_with_trailing_closure
  • empty_string
  • explicit_init
  • fallthrough
  • flatmap_over_map_reduce
  • force_try
  • force_unwrapping
  • generic_type_name
  • ibinspectable_in_extension
  • implicit_getter
  • inert_defer
  • large_tuple
  • legacy_cggeometry_functions
  • legacy_constant
  • legacy_nsgeometry_functions
  • multiple_closures_with_trailing_closure
  • no_extension_access_modifier
  • no_fallthrough_only
  • no_space_in_method_call
  • nsobject_prefer_isequal
  • private_action
  • private_outlet
  • private_unit_test
  • protocol_property_accessors_order
  • redundant_discardable_let
  • redundant_nil_coalescing
  • redundant_string_enum_value
  • strong_iboutlet
  • switch_case_on_newline
  • toggle_bool
  • trailing_semicolon
  • unneeded_break_in_switch
  • unneeded_parentheses_in_closure_argument
  • unowned_variable_capture
  • untyped_error_in_catch
  • xctfail_message
    Marcelo Fabri SimplyDanny JP Simard #2915

• Add accessibility_trait_for_button rule to warn if a SwiftUI View has a tap gesture added to it without having the button or link accessibility trait.
  Ryan Cole

• Add methods from SE-0348 to UnusedDeclarationRule.
  JP Simard

• Include the configured bind_identifier in self_binding violation messages.
  JP Simard

• Add library_content_provider file type to file_types_order rule to allow LibraryContentProvider to be ordered independent from main_type.
  dahlborn

• Add test_parent_classes option to test_case_accessibility rule, which allows detection in subclasses of XCTestCase.
  Martin Redington #4200

• Add a new if_let_shadowing opt-in rule that triggers in Swift 5.7 when a shadowing optional binding is created in an if- or guard-statement.
  SimplyDanny #4202

• Use SwiftSyntax instead of SourceKit to determine if a file has parser errors before applying corrections. This speeds up corrections significantly when none of the rules use SourceKit.
  JP Simard

• Add Swift Package Build Tool Plugin with support for Swift Packages and Xcode projects.
  Johannes Ebeling #3679 #3840

• Make private_unit_test rule correctable.
  SimplyDanny

• Disregard whitespace differences in identical_operands rule. That is, the rule now also triggers if the left-hand side and the right-hand side of an operation only differ in trivia.
  SimplyDanny

• Print violations in realtime if --progress and --output are both set.
  JP Simard

Bug Fixes

• Respect validates_start_with_lowercase option when linting function names.
  Chris Brakebill #2708

• Do not report variables annotated with @NSApplicationDelegateAdaptor and @WKExtensionDelegateAdaptor in weak_delegate rule.
  Till Hainbach #3598 #3611

• Fix false-positives related to the willMove lifecycle method in type_contents_order rule.
  SimplyDanny #3478

• Do no longer autocorrect usage of NSIntersectionRect in legacy_nsgeometry_functions rule.
  SimplyDanny #3703

• Fix Analyzer rules in Xcode 14.
  SimplyDanny #4208

• Add column for SourceKit usage to rules command.
  JP Simard

• Make nsobject_prefer_isequal rule work for nested @objc classes. Also consider the @objcMembers annotation.
  SimplyDanny

• Print fixed content at most once to STDOUT.
  SimplyDanny #4211

• Fix fatal error when content given via STDIN is corrected in the trailing_newline rule.
  SimplyDanny #4234

0.49.1: Buanderie Principale

Note: The default branch for the SwiftLint git repository was renamed from master to main on September 1st. Please update any code or automation accordingly.

Breaking

• None.

Experimental

• None.

Enhancements

• Add new self_binding opt-in rule to enforce that self identifiers are consistently re-bound to a common identifier name. Configure bind_identifier to the name you want to use. Defaults to self.
  JP Simard #2495

• Add --output option to lint and analyze commands to write to a file instead of to stdout.
  JP Simard #4048

• Add --progress flag to lint and analyze commands to show a live-updating progress bar instead of each file being processed.
  JP Simard

• --fix now works with --use-stdin, printing the output to to STDOUT instead of crashing.
  SimplyDanny #4127

Bug Fixes

• Migrate empty_xctest_method rule to SwiftSyntax fixing some false positives.
  SimplyDanny #3647 #3691

• Fix false positives in redundant_discardable_let when using async let.
  Martin Hosna #4142

• Consistently print error/info messages to stderr instead of stdout, which wasn't being done for errors regarding remote configurations.
  JP Simard

0.49.0: Asynchronous Defuzzer

Note: The default branch for the SwiftLint git repository will be renamed from master to main on September 1st. Please update any code or automation accordingly.

Breaking

• SwiftLint now requires Swift 5.6 or higher to build, and macOS 12 or higher to run.
  JP Simard

• Code Climate reports now use SHA256 strings as the issue fingerprint values.
  JP Simard

• Make comma_inheritance an opt-in rule.
  Steve Madsen #4027

• The autocorrect command that was deprecated in 0.43.0 has now been completely removed. Use --fix instead.
  JP Simard

• Remove the AutomaticTestableRule protocol. All examples listed in rules are now tested automatically to make sure they are correct.
  SimplyDanny

• Deprecate the --in-process-sourcekit command line flag. SwiftLint now always uses an in-process SourceKit.
  JP Simard

Experimental

• None.

Enhancements

• Make duplicate_imports rule correctable. Fix duplicate_imports rule reporting redundant violations when more than one duplicate is present.
  Timofey Solonin

• Support for building SwiftLint with bazel.
  JP Simard

• Support for writing custom private native rules when building with bazel.
  JP Simard Keith Smiley #3516

• Make comma rule about 10x faster, finding some previously missed cases and fixing some previously wrong corrections.
  JP Simard

• Make colon rule about 7x faster, finding some previously missed cases.
  JP Simard

• Make closure_spacing rule about 9x faster, finding some previously missed cases and fixing some previously wrong corrections.
  JP Simard SimplyDanny #4090

• Introduce new configuration option include_compiler_directives (true by default) for the indentation_width rule that allows to ignore compiler directives in the indentation analysis. This is especially useful if one (or a formatter) prefers to have compiler directives always at the very beginning of a line.
  SimplyDanny #4030

• Enable (recursive) globs in included file paths.
  sarastro-nl

• Custom rules are now broken down per rule instead of in aggregate in --benchmark.
  JP Simard

• The version command now has an optional --verbose flag that prints out the full version info, notably the build ID, which can be used to determine if two swiftlint executables are identical.
  JP Simard

• Update documentation for multiline_arguments_brackets and multiline_literal_brackets to make it immediately obvious that common examples will trigger.
  chrisjf #4060

• The --compile-commands argument can now parse SwiftPM yaml files produced when running swift build at .build/{debug,release}.yaml.
  JP Simard

• Add new configuration option allowed_no_space_operators to operator_usage_whitespace rule. It allows to specify custom operators which shall not be considered by the rule.
  imben123

• Add new protocols to remove some boilerplate involved in writing SwiftSyntax-based rules.
  JP Simard

Bug Fixes

• Fix false positive in self_in_property_initialization rule when using closures inside didSet and other accessors.
  Marcelo Fabri #4041

• Fix false positive in Duplicated Key in Dictionary Literal Violation rule when using keys that are generated at runtime with the same source code.
  OrEliyahu #4012

• Fix false positive in yoda_condition rule by basing it on SwiftSyntax.
  SimplyDanny #4081

• Fix false negatives in first_where rule when filtering array of dictionaries with String keys.
  KS1019

• Fix broken correction for explicit_init rule.
  KS1019

0.48.0: Rechargeable Defuzzer

This is the last release to support building with Swift 5.5.x and running on macOS < 12.

Breaking

• Deprecate the --path options for lint/analyze commands. Prefer the positional paths that can be added last to both commands.
  SimplyDanny

Experimental

• None.

Enhancements

• Support iOSApplicationExtension, macOSApplicationExtension, watchOSApplicationExtension, and tvOSApplicationExtension identifiers in the deployment_target rule. To configure the rule for these identifiers, you need to use the keys iOSApplicationExtension_deployment_target, macOSApplicationExtension_deployment_target, watchOSApplicationExtension_deployment_target, and tvOSApplicationExtension_deployment_target. Extentions default to their counterparts unless they are explicitly defined.
  tahabebek #4004

• Rewrite operator_usage_whitespace rule using SwiftSyntax, fixing false positives and false negatives.
  Note that this rule doesn't catch violations around return arrows (->) anymore - they are already handled by return_arrow_whitespace.
  Marcelo Fabri #3965 #3668 #2728

• Support arrays for the included and excluded options when defining a custom rule.
  Marcelo Fabri

• Add back void_function_in_ternary opt-in rule to warn against using a ternary operator to call Void functions.
  Marcelo Fabri

• Support UIEdgeInsets type in prefer_zero_over_explicit_init rule.
  KokiHirokawa #3986

Bug Fixes

• Ignore array types in syntactic_sugar rule if their associated Index is accessed.
  SimplyDanny #3502

• Prevent crash for private types named _ in type_name rules. sinoru #3971

• Make for_where rule implementation independent of order in structure dictionary. This fixes the rule in Xcode 13.3 where some violation were no longer reported.
  SimplyDanny #3975

• Update result builder methods in unused_declaration rule fixing some false-positives.
  SimplyDanny

• Look for call expressions which are not wrapped into an argument when checking for nested (possibly multiline) arguments fixing some false-negatives in (at least) Xcode 13.2.
  SimplyDanny #3975

• Make sure that include paths prefixed with the name of the original path are included in the analysis.
  SimplyDanny #3705

• Do not trigger unavailable_condition rule if other #(un)available checks are involved.
  SimplyDanny #3985

• Update nimble_operator to support the operators for beNil().
  CraigSiemens

• Avoid false-positive in let_var_whitespace rule by allowing custom attributes on lines directly before let/var declarations.
  SimplyDanny #2980

0.47.1: Smarter Appliance

Breaking

• None.

Experimental

• None.

Enhancements

• Add new option only_enforce_before_trivial_lines to vertical_whitespace_closing_braces rule. It restricts the rule to apply only before trivial lines (containing only closing braces, brackets and parentheses). This allows empty lines before non-trivial lines of code (e.g. if-else-statements).
  benjamin-kramer #3940

• Add type-checked analyzer rule version of ArrayInitRule named TypesafeArrayInitRule with identifier typesafe_array_init that avoids the false positives present in the lint rule.
  SimplyDanny #3749

• Add the --in-process-sourcekit command line flag to lint and analyze commands, which has the same effect as setting the IN_PROCESS_SOURCEKIT environment variable.
  Juozas Valancius

• Add a new artifactbundle release asset containing swiftlint binaries for x86 & arm64 macOS.
  Juozas Valancius #3840

• Add back return_value_from_void_function opt-in rule to warn against using return <expression> in a function that returns Void.
  Marcelo Fabri

• Don't skip autocorrect on files that have parser warnings. Only files with errors reported by the Swift parser will be skipped.
  Marcelo Fabri #3343

• Add accessibility_label_for_image rule to warn if a SwiftUI Image does not have an accessibility label and is not hidden from accessibility.
  Ryan Cole

• Add unavailable_condition rule to prefer using if #unavailable instead of if #available with an empty body and an else condition when using Swift 5.6 or later.
  Marcelo Fabri #3897

• Add comma_inheritance rule to validate that inheritance clauses use commas instead of &.
  Marcelo Fabri #3950

Bug Fixes

• Fix false positives in unused_closure_parameter when using parameters with backticks.
  JP Simard #3628

• Improved the syntactic_sugar rule's detection accuracy and fixed some corrections leading to invalid code.
  Paul Taykalo #3866

• Fix analyzer rules with Xcode 13.3 / Swift 5.6. Note that we've measured performance regressions compared to Swift 5.5 on the order of about 2x.
  JP Simard #3920

• Error by default on bad expiring todo date formatting.
  Christopher Hale #3636

• Lint/analyze all files listed in the command even if the --path option is used.
  coffmark

0.47.0: Smart Appliance

Breaking

• SwiftLint now requires Swift 5.5 or higher to build.
  JP Simard

• The SwiftLintFramework podspec has been removed. To our knowledge, this was completely unused by other projects and was not worth the complexity needed to justify its continued maintenance, especially in light of the integration of SwiftSyntax. The SwiftLint podspec is still supported.
  JP Simard

• SwiftLint now requires at least Swift 5.0 installed in order to lint files.
  Marcelo Fabri

Experimental

• The force_cast rule and the comment command parsing mechanism have been updated to use SwiftSyntax instead of SourceKit. Please report any problems you encounter by opening a GitHub issue. If this is successful, more rules may use Swift Syntax in the future.
  JP Simard

Enhancements

• Empty files no longer trigger any violations.
  JP Simard #3854

• Support recursive globs.
  funzin JP Simard #3789 #3891

• The legacy_random rule is now enabled by default.
  Marcelo Fabri

• The deployment_target rule now supports the #unavailable syntax added in Swift 5.6.
  Marcelo Fabri #3896

• Set the IN_PROCESS_SOURCEKIT environment variable, which will use the in-process version of sourcekitd on macOS when Xcode 13 or later is selected. This avoids the use of XPC, which is prohibited in some sandboxed environments, such as in Swift Package Manager plugins.
  Juozas Valancius

• Add ability to run only one (focused) example.
  PaulTaykalo #3911

Bug Fixes

• Extend class_delegate_protocol to correctly identify cases with the protocol body opening brace on a new line.
  Tobisaninfo

• Fix SwiftLint.pkg installer installing multiple copies of SwiftLint.
  JP Simard #3815 #3887

0.46.5: Laundry Studio

Breaking

• None.

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Fix empty_parentheses_with_trailing_closure rule when using Swift 5.6.
  Marcelo Fabri #3846

• Fix false negatives in closure_parameter_position rule with Swift 5.6.
  Marcelo Fabri #3845

• Fix regression in last_where rule when using Swift 5.6.
  Marcelo Fabri #3847

• Fix regression in unused_import rule when using Swift 5.6.
  JP Simard #3849

• Fix regression in trailing_closure rule when using Swift 5.6.
  Marcelo Fabri #3848

0.46.4: Detergent Tray

Breaking

• None.

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Ignore meta class types in prefer_self_in_static_references rule.
  SimplyDanny #3804

• Ignore MARK in multiline comment, fixing cases that would previously crash or produce invalid results when correcting.
  goranche #1749 #3841

• Fix false positive in EmptyEnumArgumentsRule rule when using Swift 5.6.
  Marcelo Fabri #3850

0.46.3: Detergent Spill

Breaking

• None.

Experimental

• None.

Enhancements

• Change fingerprint generation in CodeClimateReporter.swift to use the relative file path to better support CI/CD on multiple machines.
  HA Pors

Bug Fixes

• Fix crash in the closure_end_indentation rule when linting with Swift 5.6.
  JP Simard #3830

• Fix default rules section in documentation.
  Natan Rolnik #3857

0.46.2: Detergent Package

Breaking

• None.

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Fix SwiftLint.pkg installer on macOS 11 or later.
  JP Simard #3815

• Ignore prefer_self_in_static_references rule in extensions generally.
  SimplyDanny #3775

• Fix class_delegate_protocol false positives when using where clause.
  Steven Magdy

0.46.1: Detergent Container

Breaking

• The weak_delegate rule has been opt-in due to its high false positive rate.
  JP Simard #2786

Experimental

• None.

Enhancements

• Official Docker images are now available. See the Docker section of the README for usage instructions.
  Francisco Javier Trujillo Mata

• Allow unused_setter_value for overrides.
  Adrian Debbeler #2585

Bug Fixes

• Fix convenience_type false positives when using actors.
  JP Simard #3770

• Fix false positives in the prefer_self_in_static_references rule.
  SimplyDanny #3768

• Fix the regex for expiring TODO comments.
  Sergei Shirokov #3767

• Fix crash when parsing multi-line attributes with the attributes rule.
  JP Simard #3761

• Fix false positives in unused_closure_parameter when using list element bindings in SwiftUI.
  Paul Williamson #3790

• Fix the cache path not being properly set when using nested configurations.
  Andrés Cecilia Luque

0.45.1: Clothes Drying Hooks

Breaking

• None.

Experimental

• None.

Enhancements

• Update Rule list documentation to distinguish between opt-in and on-by-default rules.
  Benny Wong

• Add opt-in prefer_self_in_static_references rule to warn if the type name is used to reference static members the same type. Prefer using Self instead which is not affected by renamings.
  SimplyDanny

• Add support for running SwiftLint as a pre-commit hook.
  Jesse Crocker Hannes Ljungberg

Bug Fixes

• Fix unused_import rule incorrectly considering SwiftShims as a used import.
  JP Simard

• Fix false positives on large_tuple rule when using async closures.
  Kaitlin Mahar #3753

• Fix false positive on legacy_objc_type rule when using types with names that start with a legacy type name.
  Isaac Ressler #3555

0.45.0: Effectful Apparel

Breaking

• SwiftLint now requires Swift 5.4 or higher to build.
  JP Simard

Experimental

• None.

Enhancements

• Add self_in_property_initialization rule to catch uses of self inside an inline closure used for initializing a variable. In this case, self refers to the NSObject.self method and likely won't be what you expect. You can make the variable lazy to be able to refer to the current instance with self or use MyClass.self if you really want to reference the method.
  Marcelo Fabri

• Exclude id from identifier_name by default.
  Artem Garmash #3651

• Handle get async and get throws (introduced in Swift 5.5) in the implicit_getter rule.
  Marcelo Fabri #3684

• Speed up explicit type interface rule.
  PaulTaykalo #3745

• Speed up analyzer rules.
  PaulTaykalo #3747

Bug Fixes

• Fix a bug with the missing_docs rule where excludes_inherited_types would not be set.
  Ben Fox

• Fix redundant_optional_initialization autocorrect broken in case observer's brace exists. Naruki Chigira #3718

• Fix a false positive in the unneeded_break_in_switch rule when using do/catch.
  Marcelo Fabri #3724

• Speed up Computed Accessors Order rule. PaulTaykalo #3727

• [Colon Rule] Fix case when comment is used in function call. PaulTaykalo #3740

0.44.0: Travel Size Lint Roller

Breaking

• SwiftLint now requires Swift 5.3 or higher to build.
  JP Simard

Experimental

• None.

Enhancements

• Add configuration options to missing_docs rule:

  • excludes_extensions defaults to true to skip reporting violations for extensions with missing documentation comments.
  • excludes_inherited_types defaults to true to skip reporting violations for inherited declarations, like subclass overrides.
    Ben Fox

• Fix false negative on redundant_optional_initialization rule when variable has observers.
  Isaac Ressler #3621

• Make test_case_accessibility rule identify invalid test functions with parameters.
  Keith Smiley #3612

• Add duplicated_key_in_dictionary_literal rule to warn against duplicated keys in dictionary literals.
  Marcelo Fabri

• Fix the rule name from "Colon" to "Colon Spacing" to improve phrasing.
  Radu #3587

• Add discouraged_none_name opt-in rule to discourage naming cases and static/class members "none", which can conflict with Swift's Optional<T>.none when checking equality.
  Kane Cheshire #3624

• Improve language and positioning of file_length warnings when ignore_comment_only_lines: true.
  Steven Grosmark #3654

• Add anonymous_argument_in_multiline_closure opt-in rule to validate that named arguments are used in closures that span multiple lines.
  Marcelo Fabri

Bug Fixes

• Fix false positives in empty_enum_arguments rule when comparing values with a static member (e.g. if number == .zero).
  Marcelo Fabri #3562

• Fix the regex for expiring-todos.
  namolnad #3597

• Fix type_contents_order initializer detection.
  StevenMagdy

• Fix autocorrect when there's no space between the tuple the in keyword on unneeded_parentheses_in_closure_argument rule.
  p-x9 #3633

• Fix unused_capture_list, empty_enum_arguments, implicit_return and explicit_type_interface rules when using Swift 5.4.
  Marcelo Fabri #3615 #3685

• Fix Xcode build logs with spaces in paths preventing analyze from running.
  adamawolf

0.43.1: Laundroformat

Breaking

• None.

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Fix the File Length rule name.
  onato #3560

• Re-add --format flag to reformat Swift files using SourceKit. Only applied with --fix/--autocorrect.
  JP Simard #3571

0.43.0: Clothes Line Interface

Breaking

• The command line syntax has slightly changed due to migrating from the Commandant command line parsing library to swift-argument-parser. For the most part the breaking changes are all to make the syntax more unix compliant and intuitive to use. For example, commands such as swiftlint --help or swiftlint -h now work as expected. The help output from various commands has greatly improved as well. Notably: swiftlint autocorrect was removed in favor of swiftlint --fix. Previous commands should continue to work temporarily to help with the transition. Please let us know if there's a command that no longer works and we'll attempt to add a bridge to help with its transition.
  JP Simard

• Configuration files now consistently have their included/excluded relative file paths applied relative to their location in the file system. Previously the root configuration file applied these relative to the current working directory, but nested configurations applied these to their location in the file system.
  Frederick Pietschmann JP Simard

• The discarded_notification_center_observer is now opt-in due to some difficult to resolve false positives, such as #3498.
  JP Simard

Experimental

• None.

Enhancements

• Added allows_single_line option in multiline_parameters rule configuration. Defaults to true. This enforces parameters in a method with multiple parameters to always be in different lines.
  Otavio Cordeiro

• Support relative paths in compilation databases for SwiftLint analyzer rules.
  JP Simard

• Add opt-in rule discouraged_assert to encourage the use of assertionFailure() and/or preconditionFailure() over assert(false).
  Otavio Cordeiro

• Adds balanced_xctest_lifecycle opt-in rule to enforce balanced setUp and tearDown methods in a test class.
  Otavio Cordeiro #3452

• Tweak the auto-correction result console output for clarity.
  mokagio #3522

• Allow configuring related USRs to skip in UnusedDeclarationRule by specifying a list of USRs in the related_usrs_to_skip key. For example you might have custom source tooling that does something with types conforming to a procotol even if that type is never explicitly referenced by other code.
  JP Simard

• Make strong_iboutlet rule correctable.
  MaxHaertwig

• Add legacy_objc_type opt-in rule to warn against using bridged Objective-C reference types instead of Swift value types.
  Blake #2758

• Support Swift Playground control comments in the comment_spacing rule.
  Thomas Goyne

• [Internal] Integrate OS Signposts to help profile SwiftLint performance.
  jpsim

• Update CodeClimateReporter to produce relative paths.
  bmwalters

• Add Bool violation reporting in redundant_type_annotation.
  Artem Garmash #3423

• Add a new capture_variable analyzer rule to warn about listing a non-constant (var) variable in a closure's capture list. This captures the variable's value at closure creation time instead of closure call time, which may be unexpected.
  Laszlo Kustra

• Log references to a specified module when running the unused_import by setting the SWIFTLINT_LOG_MODULE_USAGE=<module-name> environment variable when running analyze.
  jpsim

• Add opt-in rule private_subject rule which warns against public Combine subjects.
  Otavio Cordeiro

Bug Fixes

• Fix custom_rules merging when the parent configuration is based on only_rules.
  Frederick Pietschmann #3468

• Fix misleading warnings about rules defined in the custom_rules not being available (when using multiple configurations).
  Frederick Pietschmann #3472

• Fix bug that prevented the reconfiguration of a custom rule in a child config.
  Frederick Pietschmann #3477

• Fix typos in configuration options for file_name rule.
  advantis

• Fix issue that prevented the inclusion of a configuration file from a parent folder.
  Frederick Pietschmann #3485

• Fix violation location and misplaced corrections for some function references in explicit_self rule.
  JP Simard

• Fix false positives with result builders in unused_declaration.
  JP Simard

• Find more unused declarations in unused_declaration.
  JP Simard

• Fix parsing xcode logs for analyzer rules for target names with spaces.
  JP Simard #3021

0.42.0: He Chutes, He Scores

Breaking

• SwiftLint now requires Swift 5.2 or higher to build.
  JP Simard

• SwiftLintFramework can no longer be integrated as a Carthage dependency.
  JP Simard #3412

• SwiftLint.xcworkspace and SwiftLint.xcproject have been completely removed. You can still use Xcode to develop SwiftLint by opening it as a Swift Package by typing xed . or xed Package.swift from your shell.
  JP Simard #3412

• Renamed statement_level to function_level in nesting rule configuration.
  Skoti

• Separated type_level and function_level counting in nesting rule.
  Skoti #1151

• function_level in nesting rule defaults to 2 levels.
  Skoti

• Added check_nesting_in_closures_and_statements in nesting rule to search for nested types and functions within closures and statements. Defaults to true.
  Skoti

• Renamed OverridenSuperCallConfiguration to OverriddenSuperCallConfiguration.
  Bryan Ricker #3426

Experimental

• None.

Enhancements

• Don't report @UIApplicationDelegateAdaptor statements in weak-delegate rule. Richard Turton #3286

• Don't report unavailable_function violations for functions returning Never.
  Artem Garmash #3286

• Added always_allow_one_type_in_functions option in nesting rule configuration. Defaults to false. This allows to nest one type within a function even if breaking the maximum type_level.
  Skoti #1151

• Add option to specify a child_config / parent_config file (local or remote) in any SwiftLint configuration file. Allow passing multiple configuration files via the command line. Improve documentation for multiple configuration files.
  Frederick Pietschmann #1352

• Add an always_keep_imports configuration option for the unused_import rule.
  Keith Smiley

• Add comment_spacing rule.
  Noah Gilmore #3233

• Add codeclimate reporter to generate JSON reports in codeclimate format. Could be used for GitLab Code Quality MR Widget.
  jkroepke #3424

• Add an override_allowed_terms configuration parameter to the inclusive_language rule, with a default value of mastercard.
  Dalton Claybrook #3415

Bug Fixes

• Remove @IBOutlet and @IBInspectable from UnusedDeclarationRule.
  Keith Smiley #3184

0.41.0: World’s Cleanest Voting Booth

Breaking

• Changed behavior of strict option on lint and analyze to treat all warnings as errors instead of only changing the exit code.
  Jeehut #3312

• Removed the unneeded_notification_center_removal rule because it was based on an incorrect premise.
  JP Simard #3338

• The whitelist_rules configuration key has been renamed to only_rules.
  Dalton Claybrook

Experimental

• None.

Enhancements

• Add use-alternative-excluding option to speed up linting in cases described in #3325. This option yields different exclusion behavior.
  JohnReeze #3304

• Add test_case_accessibility rule.
  Keith Smiley #3376

• Add more details to CONTRIBUTING.md.
  mknabbe #1280

• Remove @IBOutlet and @IBInspectable from UnusedDeclarationRule.
  Keith Smiley #3184

• Add allow_multiline_func configuration option to opening_brace rule, to allow placing { on new line in case of multiline function. Defaults to false.
  Zsolt Kovács #1921

• Update the nslocalizedstring_key rule to validate the comment argument in addition to the key argument.
  Dalton Claybrook #3334

• Add inclusive_language rule to encourage the use of inclusive language that avoids discrimination against groups of people.
  Dalton Claybrook

• Add prefer_nimble opt-in rule to encourage using Nimble matchers over the XCTest ones.
  Marcelo Fabri #3293

• unused_closure_parameter rule now validates closures outside of function calls.
  Marcelo Fabri #1082

• Improve documentation for running SwiftLint as Xcode build phase.
  Christian Mitteldorf #3169

• Add skip_aligned_constants (defaults to true) and lines_look_around (defaults to 2) configuration parameters to the operator_usage_whitespace rule.
  Paul Taykalo #3388

Bug Fixes

• Fix parsing of Xcode 12 compiler logs for analyzer rules.
  JP Simard #3365

• Fix some SwiftUI unused declaration rule false positives.
  JP Simard #3365

• Fix some false positives in rule explicit_self.
  Sven Münnich

• Fix incorrect autocorrection in prefer_zero_over_explicit_init rule.
  Paul Taykalo

• Rule unused_capture_list should not be triggered by unowned self keyword.
  hank121314 #3389

• Fix severity configuration for indentation_width.
  Samasaur1 #3346

• Fix DuplicateImportsRule's support for import attributes.
  Keith Smiley #3402

• Allow "allowed symbols" as first character in identifier_name.
  JP Simard #3306

• Fix false positives with parameterized attributes in attributes.
  JP Simard #3316

• Fix some missed cases in rule unavailable_function.
  Quinn Taylor #3374

• Fix incorrect violation message for line length violations.
  JP Simard #3333

• Fix inconsistency in operator_usage_whitespace rule.
  Paul Taykalo #3321

• Fix false positives in convenience_type rule for types that cannot be converted to enums.
  ZevEisenberg #3033

• Fix finding a nested config when a single file path is passed.
  Seth Friedman

• Fix incorrect calculation of the root path when a directory in the tree is passed in as a path argument.
  Seth Friedman #3383

• Fix rare false positive in toggle_bool rule.
  Marcelo Fabri #3398

0.40.3: Greased Up Drum Bearings

Breaking

• None.

Experimental

• None.

Enhancements

• Make the unused_declaration rule run 3-5 times faster, and enable it to detect more occurrences of unused declarations.
  JP Simard

• Remove unneeded internal locking overhead, leading to increased performance in multithreaded operations.
  JP Simard

• Skip correcting file if the swift parser reports a warning or an error.
  JP Simard #3343

Bug Fixes

• Rule unused_capture_list should not be triggered by self keyword.
  hank121314 #2367

• Rule multiple_closures_with_trailing_closure no longer triggers when Swift 5.3's 'multiple trailing closures' feature is used. Jumhyn #3295

0.40.2: Demo Unit

Breaking

• None.

Experimental

• None.

Enhancements

• Improve description for empty_enum_arguments.
  Lukas Schmidt

• Add support for excluded_match_kinds custom rule config parameter.
  Ryan Demo

Bug Fixes

• None.

0.40.1: A Baffling Response

Breaking

• None.

Experimental

• None.

Enhancements

• Add support for params files for file paths.
  keith

Bug Fixes

• Fix .swift-version to use Swift 5.1.
  cfiken #3297

• Fix test testDetectSwiftVersion for Swift 5.2.5.
  cfiken #3299

0.40.0: Washable Mask

Breaking

• SwiftLint now requires Swift 5.1 or higher to build.
  JP Simard

• Improve compile commands json file validation. If you previously provided invalid files or arguments, the command will now abort.
  Keith Smiley

Experimental

• None.

Enhancements

• JUnit reporter for GitLab artifact:report:junit with better representation of found issues.
  krin-san #3177

• Add opt-in ibinspectable_in_extension rule to lint against @IBInspectable properties in extensions.
  Keith Smiley

• Add computed_accessors_order rule to validate the order of get and set accessors in computed properties and subscripts.
  Marcelo Fabri #3158

• Extend empty_enum_arguments rule to support if case and guard case.
  Zsolt Kovács #3103

• Add prefer_zero_over_explicit_init opt-in rule to enforce using .zero instead of calling constructor with zero arguments (e.g. CGPoint(x: 0, y: 0)) when using CoreGraphics types.
  Anton Nazarov #3190

• Add swiftlint docs command to easily open online documentation.
  417-72KI

• Add unneeded_notification_center_removal rule to warn against using NotificationCenter.removeObserver(self) in deinit since it's not required after iOS 9/macOS 10.11.
  Amzd #2755

Bug Fixes

• Fix UnusedImportRule breaking transitive imports.
  keith

• Fix severity level configuration for duplicate_imports.
  Yusuke Goto

• Fixes false positives for multiline_parameters_brackets and multiline_arguments_brackets.
  Noah Gilmore #3167

• Fix conflict of 'opening_brace' with 'implicit_return' for functions implicitly returning a closure.
  SimplyDanny #3034

• Fix false positive on switch_case_on_newline rule with do/catch statements when using Swift 5.3.
  Marcelo Fabri #3253

• Fix false positive uppercase enum case in raw_value_for_camel_cased_codable_enum rule.
  Teameh

• Fix false positive in no_space_in_method_call rule with multiple trailing closures (Swift 5.3).
  Marcelo Fabri #3259

• Fix false negative in explicit_acl rule when using extension with Swift 5.2+.
  Marcelo Fabri #3186

• closure_parameter_position now triggers in closures that are not inside a function call and also validates captured variables.
  Marcelo Fabri #3225

• Fix some cases where the output would be incomplete when running SwiftLint on Linux.
  Marcelo Fabri #3214

• compiler_protocol_init now triggers on IndexSet(arrayLiteral:).
  Janak Shah #3284

• Fix false positives in extension_access_modifier rule when using Swift 5.2.
  Marcelo Fabri #3150

0.39.2: Stay Home

This is the last release to support building with Swift 5.0.x.

Breaking

• None.

Experimental

• None.

Enhancements

• Add configuration options to the unused_import rule to require explicit import statements for each module referenced in a source file (require_explicit_imports). When this setting is enabled, an allowed_transitive_imports setting may also be specified to allow a mapping of modules to transitively imported modules. See PR for details: realm#3123
  JP Simard #3116

Bug Fixes

• Fix more false positives in implicit_getter rule in extensions when using Swift 5.2.
  Marcelo Fabri #3149

• Fix false positives in redundant_objc_attribute rule in extensions when using Swift 5.2.
  Marcelo Fabri

• Fix false positives in attributes rule when using rethrows using Swift 5.2.
  JP Simard

• Fix false positives in valid_ibinspectable rule when defining inspectable properties in class extensions with computed properties using Swift 5.2.
  JP Simard

0.39.1: The Laundromat has a Rotating Door

Breaking

• The new rules introduced in 0.39.0 that depend on SwiftSyntax have been temporarily removed as we work out release packaging issues.
  • prohibited_nan_comparison
  • return_value_from_void_function
  • tuple_pattern
  • void_function_in_ternary
    JP Simard #3105

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Fix unused_import rule reported locations and corrections when multiple @testable imports are involved.
  JP Simard

0.39.0: A Visitor in the Laundromat

Breaking

• Replace all uses of Int/Int64/NSRange representing byte offsets to use newly introduced ByteCount and ByteRange values instead. This will minimize the risk of accidentally using a byte-based offset in character-based contexts.
  Paul Taykalo JP Simard

• SwiftLint now imports SwiftSyntax and requires Xcode 11.0 to build.
  Marcelo Fabri

Experimental

• None.

Enhancements

• Add option to pass successfully if no files passed to SwiftLint are lintable.
  thedavidharris #2608i

• Add deinitializer type content to type_contents_order rule instead of grouping it with initializers.
  Steven Magdy

• Inline test failure messages to make development of SwiftLint easier. Test failures in triggering and non-triggering examples will appear inline in their respective files so you can immediately see which cases are working and which are not.
  ZevEisenberg #3040

• Introduce a new SyntaxRule that enables writing rules using SwiftSyntax.
  Marcelo Fabri

• Add tuple_pattern opt-in rule to warn against using assigning variables through a tuple pattern when the left side of the assignment contains labels.
  Marcelo Fabri #2203

• Add return_value_from_void_function opt-in rule to warn against using return <expression> in a function that is Void.
  Marcelo Fabri

• Add void_function_in_ternary opt-in rule to warn against using a ternary operator to call Void functions.
  Marcelo Fabri #2358

• Add only_after_dot configuration option to empty_count rule. With the option enabled, empty_count rule will ignore variables named count. By default, this option is disabled.
  Zsolt Kovács #827

• Add prohibited_nan_comparison opt-in rule to validate using isNaN instead of comparing values to the .nan constant.
  Marcelo Fabri #2086

• Add case preview_provider to the order list of file_types_order to fix an issue with false positives for PreviewProvider subclasses in SwiftUI.
  Cihat Gündüz #2860

Bug Fixes

• Fix false positive in attributes rule with @autoclosure parameters when using Swift 5.2.
  Mateusz Matrejek #3079

• Fix discarded_notification_center_observer false positives when capturing observers into an array.
  Petteri Huusko

• Fix crash when non-closed #if was present in file.
  PaulTaykalo

• Fix false positives when line ends with carriage return + line feed.
  John Mueller #3060

• Implicit_return description now reports current config correctly. John Buckley

• Fix false positive in implicit_getter rule in extensions when using Swift 5.2.
  Marcelo Fabri #3074

• Do not trigger optional_enum_case_matching rule on _? as the ? might be required in some situations.
  Marcelo Fabri #3057

• Fix false positive in attributes rule with @escaping parameters when using Swift 5.2.
  Marcelo Fabri #3079

• Fix false positive in empty_string rule when using multiline string literals.
  Marcelo Fabri #3100

0.38.2: Machine Repair Manual

Breaking

• None.

Experimental

• None.

Enhancements

• Add option to configure which kinds of expressions should omit their return keyword by introducing an included configuration for the implicit_return rule. Supported values are closure, function and getter. Defaults to all three.
  Sven Münnich #2870

• Add --correctable and --verbose arguments to the rules command to allow displaying only correctable rules, and to always print the full configuration details regardless of your terminal width.
  Optional Endeavors

• Add capture_group option to custom_rules for more fine-grained placement of the location marker for violating code.
  pyrtsa

• Add orphaned_doc_comment rule to catch doc comments that are not attached to any declarations.
  Marcelo Fabri #2989

• Add new indentation opt-in rule (indentation_width) checking for super-basic additive indentation pattern.
  Frederick Pietschmann #227

• Catch previously missed violations in the optional_enum_case_matching rule when case expressions involved tuples.
  JP Simard

• API docs for SwiftLintFramework are now available at realm.github.io/SwiftLint. Rules.md now redirects to the rules directory in the API docs here. Contributors no longer need to update rule documentation in PRs as this is now done automatically. The rule documentation now includes the default configuration.
  JP Simard #1653 #1704 #2808 #2933 #2961

Bug Fixes

• Fix issues in unused_import rule when correcting violations in files containing @testable imports where more than the unused imports would be removed.
  JP Simard

0.38.1: Extra Shiny Pulsator Cap

Breaking

• None.

Experimental

• None.

Enhancements

• Make weak_delegate rule correctable.
  MaxHaertwig

• Allow SubstitutionCorrectableRule to return nil instead of a correction to indicate that a suitable correction couldn't be found for a specific case.
  MaxHaertwig

• Add enum_case_associated_value_count opt-in rule.
  lakpa #2997

• Add optional_enum_case_matching opt-in rule to validate that optional enum cases are matched without using ? when using Swift 5.1 or above. See SR-7799 for more details.
  Marcelo Fabri

• Add prefer_self_type_over_type_of_self opt-in rule to enforce using Self instead of type(of: self) when using Swift 5.1 or above.
  Marcelo Fabri #3003

Bug Fixes

• Fix crash in unused_import rule when unused imports have trailing comments.
  JP Simard #2990

• Handle @_exported imports in unused_import rule.
  JP Simard #2877

• Fix false positives from the unused_declaration rule involving functions in protocol extensions.
  JP Simard

• Fix parsing of SwiftLint commands containing a URL in their trailing comment.
  Sven Münnich

• Added missing parameters to FileNameConfiguration.consoleDescription.
  timcmiller #3009

• Fix crash when SourceKit returns out of bounds string byte offsets.
  JP Simard

0.38.0: Toroidal Agitation

Breaking

• Replace the SyntaxToken and SyntaxMap structures used in public SwiftLintFramework APIs with a new SwiftLintSyntaxToken and SwiftlintSyntaxMap wrappers over structures returned from SourceKitten.
  PaulTaykalo #2955

Experimental

• None.

Enhancements

• Make control_statement rule correctable.
  MaxHaertwig

• Add expiring_todo opt-in rule to allow developers to mark their todos with an expiration date.
  Dan Loman #727

• Support compilation databases for swiftlint analayze.
  kastiglione #2962

Bug Fixes

• Fix false positive for LetVarWhitespaceRule.
  PaulTaykalo #2956

• Fix for false-positive identical operands rule.
  PaulTaykalo #2953

• Fixed false positive in opening_brace rule on anonymous closure.
  Andrey Uryadov #2879

0.37.0: Double Load

Breaking

• Replace the [String: SourceKittenRepresentable] dictionaries used in public SwiftLintFramework APIs with a new SourceKittenDictionary wrapper over dictionaries returned from SourceKitten.
  PaulTaykalo #2922

• Update Commandant dependency to version 0.17.0, removing the antitypical/Result dependency in favor of the Swift standard library's Result type.
  JP Simard

Experimental

• None.

Enhancements

• Speed up many operations by using SwiftLintFile wrapper over File from SourceKitten, caching most members derived from the File.
  PaulTaykalo #2929

• Speed up Swiftlint by using swift enums instead of raw values for dictionary lookups.
  PaulTaykalo #2924

• Speed up Identical Operands rule by using syntaxmap instead of regular expressions.
  PaulTaykalo #2918

• Speed up syntax token lookups, which can improve performance when linting large files.
  PaulTaykalo
  #2916

• Use faster comparison in 'file_types_order' rule.
  PaulTaykalo #2949

• Speed up recursively executed rules (all AST rules and some others) by avoiding the creation of many intermediate collections when accumulating results.
  PaulTaykalo #2951

• Add GitHub Actions Logging reporter (github-actions-logging).
  Norio Nomura

Bug Fixes

• None.

0.36.0: 👕👚👗

Breaking

• SwiftLint now requires Swift 5.0 or higher to build.
  JP Simard

Experimental

• None.

Enhancements

• Add contains_over_range_nil_comparison opt-in rule to prefer using contains over comparison of range(of:) to nil.
  Colton Schlosser #2776

• Make contains_over_first_not_nil rule also match first(where:) == nil.
  Colton Schlosser

• Add two new cases to the Mark rule to detect a Mark using three slashes.
  nvanfleet #2866

• Add flatmap_over_map_reduce opt-in rule to prefer using flatMap over map { ... }.reduce([], +).
  Marcelo Fabri #2883

• Add autocorrection to syntactic_sugar.
  Ivan Vavilov

• Make toggle_bool rule substitution correctable.
  MaxHaertwig

• Optimize the performance of redundant_void_return rule.
  Marcelo Fabri

• Support building with Swift 5.1 on Linux.
  Marcelo Fabri #2874

• Add raw_value_for_camel_cased_codable_enum opt-in rule to enforce raw values for camel cased Codable String enum cases.
  Marko Pejovic #2888

• Speedup LetVarWhiteSpacesRule.
  PaulTaykalo #2901

Bug Fixes

• Fix running analyzer rules on the output of builds performed with Xcode 11 or later.
  JP Simard

0.35.0: Secondary Lint Trap

This is the last release to support building with Swift 4.2.x.

Breaking

• None.

Experimental

• None.

Enhancements

• Type name rules considers SwiftUI template code.
  atfelix #2791

• Add no_space_in_method_call rule to validate that there're no spaces between the method name and parentheses in a method call.
  Marcelo Fabri

• Add contains_over_filter_count opt-in rule to warn against using expressions like filter(where:).count > 0 instead of contains(where:).
  Marcelo Fabri #2803

• Add contains_over_filter_is_empty opt-in rule to warn against using expressions like filter(where:).isEmpty instead of contains(where:).
  Marcelo Fabri

• Add empty_collection_literal opt-in rule to prefer using isEmpty to comparison to [] or [:].
  Colton Schlosser #2807

Bug Fixes

• Fixed false positive in colon rule inside guard and ternary operator.
  Andrey Uryadov #2806

• Release memory created for sourcekitd requests.
  Colton Schlosser #2812

• Fix swiftlint rules output table formatting.
  JP Simard #2787

• Don't trigger missing_docs violations when implementing deinit.
  Marcelo Fabri #2690

• Fix unused_import rule false positive when only operators from the module are used.
  Timofey Solonin #2737

• Avoid triggering redundant_type_annotation rule when declaring IBInspectable properties.
  Marcelo Fabri #2842

• Don't trigger missing_docs violations on extensions.
  Marcelo Fabri #2851

0.34.0: Anti-Static Wool Dryer Balls

Breaking

• To enable collecting rules, many breaking changes to SwiftLintFramework's public API were made the Linter type was significantely changed, and a new CollectedLinter type was introduced. Many public SwiftLintFramework APIs that interacted with Linter have also been affected. More new types and protocols were added such as RuleStorage, AnyCollectingRule, CollectingRule, CollectingCorrectableRule. We are not aware of any significant users of the SwiftLintFramework library, so if you are affected by this, please reach out to SwiftLint contributors by filing a GitHub issue about your use case.
  Elliott Williams JP Simard

Experimental

• Add a two-stage CollectingRule protocol to support rules that collect data from all files before validating. Collecting rules implement a collect method which is called once for every file, before any file is checked for violations. By collecting, rules can be written which validate across multiple files for things like unused declarations.
  Elliott Williams #2431

• Add a new unused_declaration analyzer rule to lint for unused declarations. By default, detects unused fileprivate, private and internal declarations. Configure the rule with include_public_and_open: true to also detect unused public and open declarations.
  JP Simard

• Completely remove the unused_private_declaration rule. Please use unused_declaration instead.
  JP Simard

Enhancements

• Added 'file_name_no_space' opt-in rule.
  timcmiller #3007

Bug Fixes

• None.

0.33.1: Coin-Operated Property Wrapper

Breaking

• None.

Experimental

• None.

Enhancements

• Significantly improve performance when running with a large number of cached configurations or when running with many cached results. This was done by splitting each configuration to have its own cache and by encoding the cache as a binary property list instead of json.
  Colton Schlosser JP Simard

• Several public types in SwiftLintFramework have added Codable conformance: Location, RuleDescription, RuleKind, StyleViolation, SwiftVersion, ViolationSeverity.
  JP Simard

• Print full relative path to file in log output when it matches the file name of another path being linted.
  Keith Smiley

Bug Fixes

• Don't trigger vertical_parameter_alignment violations when using parameters with attributes such as @ViewBuilder in function declarations.
  Marcelo Fabri #2792

• Fix false positive in function_default_parameter_at_end rule when using a closure parameter with default value.
  Marcelo Fabri #2788

0.33.0: Worldwide Dryers Conference

Breaking

• Remove the weak_computed_property rule. Please see linked issue for discussion and rationale.
  JP Simard #2712

Experimental

• None.

Enhancements

• Add " - " delimiter to allow commenting SwiftLint commands without triggering superfluous_disable_command.
  Kevin Randrup

• Make testSimulateHomebrewTest() test opt-in because it may fail on unknown condition. Set SWIFTLINT_FRAMEWORK_TEST_ENABLE_SIMULATE_HOMEBREW_TEST environment variable to test like:

  $ SWIFTLINT_FRAMEWORK_TEST_ENABLE_SIMULATE_HOMEBREW_TEST=1 \
  swift test --filter testSimulateHomebrewTest

  Norio Nomura

• Add option to configure how nested types should be separated in file names by introducting nested_type_separator configuration for the file_name rule.
  Frederick Pietschmann #2717

• Add unowned_variable_capture opt-in rule to warn against unowned captures in closures when using Swift 5.
  Marcelo Fabri #2097

• Don't trigger a no_fallthrough_only violation if next case is an @unknown default.
  Marcelo Fabri #2696

• Add duplicate_enum_cases rule to validate that an enum doesn't contain duplicated cases, as it's impossible to switch on it (see SR-10077 for details).
  Marcelo Fabri #2676

• Add legacy_multiple opt-in rule to warn against using the remainder operator (%) checking for a remainder of zero when using Swift 5.
  Marcelo Fabri #2612

Bug Fixes

• Don't trigger redundant_void_return violations when using subscript as the return type is required.
  Marcelo Fabri

• Skip module import if cursor info is missing module info.
  alvarhansen #2746

• Don't trigger file_types_order violations in files only containing extensions.
  Sam Rayner #2749

• Force-unwrapping self should trigger a violation of the force_unwrapping rule.
  Dalton Claybrook #2759

0.32.0: Wash-N-Fold-N-Reduce

Breaking

• None.

Experimental

• None.

Enhancements

• Add reduce_boolean rule to prefer simpler constructs over reduce(Boolean).
  Xavier Lowmiller #2675

• Add nsobject_prefer_isequal rule to warn against implementing == on an NSObject subclass as calling isEqual (i.e. when using the class from Objective-C) will not use the defined == method.
  Matthew Healy #2663

• Add reduce_into opt-in rule to encourage the use of reduce(into:_:) instead of reduce(_:_:) which is less performant.
  Dalton Claybrook #2658

• Remove @ mark to fix invalid link in Rules.md.
  Hiroki Nagasawa #2669

• Add new opt-in rule file_types_order to specify how the types in a file should be sorted.
  Cihat Gündüz #2294

• Add new opt-in rule type_contents_order to specify the order of subtypes, properties, methods & more within a type.
  Cihat Gündüz #2294

• Add nslocalizedstring_require_bundle rule to ensure calls to NSLocalizedString specify the bundle where the strings file is located.
  Matthew Healy #2595

• contains_over_first_not_nil rule now also checks for firstIndex(where:).
  Marcelo Fabri #2678

• Add unused_capture_list rule to ensure that all references in a closure capture list are used.
  Dalton Claybrook #2715

• SwiftLint can now be compiled using Xcode 10.2.
  Marcelo Fabri Norio Nomura #2693

Bug Fixes

• Fix bug where SwiftLint ignores excluded files list in a nested configuration file.
  Dylan Bruschi #2447

• colon rule now catches violations when declaring generic types with inheritance or protocol conformance.
  Marcelo Fabri #2628

• discarded_notification_center_observer rule now checks if the observer is added to any collection or passed to a function before triggering the violation.
  jsloop42 #2684

• Fix false positives on number_separator when the number is wrapped in parentheses.
  Dalton Claybrook #2683

• Fix false positives on sorted_first_last when calling firstIndex and lastIndex method. Taiki Komaba #2700

• Fix crash when running on Linux with Swift 5 without specifying a --path value or specifying an empty string.
  Keith Smiley #2703

• Fix false positives on explicit_acl and explicit_top_level_acl rules when declaring extensions that add protocol conformances with Swift 5.
  Marcelo Fabri #2705

• Let disable all command override superfluous_disable_command rule.
  Frederick Pietschmann #2670

• Fix issues in explict_acl, redundant_set_access_control and explicit_top_level_acl rules when using Swift 5.
  Marcelo Fabri #2694

0.31.0: Busy Laundromat

Breaking

• None.

Experimental

• None.

Enhancements

• Add deployment_target rule to validate that @availability attributes and #available conditions are not using a version that is satisfied by the deployment target. Since SwiftLint can't read an Xcode project, you need to configure this rule with these keys: iOS_deployment_target, macOS_deployment_target, watchOS_deployment_target and tvOS_deployment_target. By default, these values are configured with the minimum versions supported by Swift.
  Marcelo Fabri #2589

• Add weak_computed_property rule to warn against using weak in a computed property as it has no effect.
  Marcelo Fabri #2596

• Add SwiftVersion.five and automatically detect it when computing SwiftVersion.current.
  JP Simard

• Make redundant_objc_attribute rule autocorrectable.
  Daniel Metzing

• Add required_deinit opt-in rule to ensure that all classes have a deinit method. The purpose of this is to make memory leak debugging easier so all classes have a place to set a breakpoint to track deallocation.
  Ben Staveley-Taylor #2620

• nimble_operator now warns about beTrue() and beFalse().
  Igor-Palaguta #2613

• Warn if a configured rule is not enabled.
  Marcelo Fabri #1350

• Add exclude_ranges option to number_separator for exclusion.
  Cihat Gündüz #2637

Bug Fixes

• Fix false positives on no_grouping_extension rule when using where clause.
  Almaz Ibragimov

• Fix explicit_type_interface when used in statements.
  Daniel Metzing #2154

• Fix lower_acl_than_parent when linting with Swift 5.
  JP Simard #2607

• Fix let_var_whitespace with #warning.
  Igor-Palaguta #2544

• Fix excessive superfluous_disable_command violations being reported when using an invalid rule identifier in a disable command.
  Marcelo Fabri #2623

• Fix explicit_type_interface with allow_redundancy when assigning type references to variables.
  Cihat Gündüz #2636

• Fix unused_closure_parameter when argument is named self.
  Cihat Gündüz #2437

• Fix first_where for some calls on Realm collection types.
  Cihat Gündüz #1930

0.30.1: Localized Stain Remover

Breaking

• None.

Experimental

• Silence CodingKeys violations in unused_private_declaration since these should always be intentional violations.
  Kim de Vos #2573

Enhancements

• Add nslocalizedstring_key opt-in rule to validate that keys used in NSLocalizedString calls are static strings, so genstrings will be able to find them.
  Marcelo Fabri

Bug Fixes

• Fix false positives on trailing_closure rule when using anonymous closure calls.
  Marcelo Fabri #2159

• Fix false positives on array_init rule when using prefix operators.
  Marcelo Fabri #1877

• Exclude files defined in the excluded value of SwiftLint's configuration when --use-script-input-files and --force-exclude are specified.
  Luis Valdés #591

0.30.0: A New Washer and Dryer Set

Breaking

• None.

Experimental

• None.

Enhancements

• Add duplicate_imports rule to prevent importing the same module twice.
  Samuel Susla #1881

• Add unused_setter_value rule to validate that setter arguments are used in properties.
  Marcelo Fabri #1136

• Add only_single_muted_parameter configuration on trailing_closure rule to only enforce using trailing closure on functions that take one single muted parameter.
  Marcelo Fabri

Bug Fixes

• Fix false positives on identical_operands rule when the right side of the operand has a chained optional.
  JP Simard #2564

0.29.4: In-Unit Operands

Breaking

• None.

Experimental

• Fix unused_import correction deleting unrelated ranges when there are multiple violations in a single file.
  JP Simard #2561

Enhancements

• Add strong_iboutlet opt-in rule to enforce that @IBOutlets are not declared as weak.
  Marcelo Fabri #2433

Bug Fixes

• Fix inaccessible custom rules in nested configurations.
  Timofey Solonin #1815 #2441

• Improve superfluous_disable_command to warn against disabling non-existent rules.
  Kim de Vos #2348

• Fix false positives on identical_operands rule when the right side of the operand does not terminate.
  Xavier Lowmiller #2467

0.29.3: Entangled Agitator

Breaking

• None.

Experimental

• Skip @IBInspectable and deinit declarations in unused_private_declaration.
  JP Simard

Enhancements

• Allow configuring discouraged_object_literal rule to only discourage one kind of object literal.
  Marcelo Fabri #2439

• Adds xct_specific_matcher opt-in rule to enforce specific matchers over XCTAssertEqual and XCTAssertNotEqual.
  Ornithologist Coder #1874

• Add last_where opt-in rule that warns against using .filter { /* ... */ }.last in collections, as .last(where: { /* ... */ }) is more efficient.
  Marcelo Fabri

• Add unused_control_flow_label rule to validate that control flow labels are used.
  Marcelo Fabri #2227

Bug Fixes

• Fix false positives on first_where rule when calling filter without a closure parameter (for example on a Realm collection).
  Marcelo Fabri

• Fix false positives on sorted_first_last rule when calling sorted with a different argument than by: (e.g. on a Realm collection).
  Marcelo Fabri #2533

• Fix false positives on redundant_objc_attribute rule when using nested types.
  Marcelo Fabri #2539

• Fix false positives on vertical_whitespace_between_cases rule when a blank line is present but it contains trailing whitespace.
  Ben Staveley-Taylor #2538

0.29.2: Washateria

Breaking

• None.

Experimental

• None.

Enhancements

• Add new opt-in rule vertical_whitespace_opening_braces to warn against empty lines after opening braces.
  Cihat Gündüz #1518

• Add new opt-in rule vertical_whitespace_closing_braces to warn against empty lines before closing braces.
  Cihat Gündüz #1518

• Improve performance for unused_private_declaration and unused_import rules for large files.
  Niil Öhlin

• Add new legacy_hashing rule to encourage the use of Swift 4.2's new hashing interface.
  Kim de Vos #2108

• Improve private_unit_test rule to allow private classes with @objc attribute.
  Kim de Vos #2282

• Support glob patterns without the star.
  Maksym Grebenets

• Make modifier_order rule autocorrectable.
  Timofey Solonin #2353

Bug Fixes

• Fix false positives in redundant_objc_attribute for private declarations under @objcMembers.
  Daniel Metzing #2499

• Fix an error when pulling SwiftLint as a dependency using Carthage.
  JP Simard

• Non-string values specified in swiftlint_version now fail the lint if it doesn't match the version.
  JP Simard #2518

0.29.1: There’s Always More Laundry

Breaking

• None.

Experimental

• None.

Enhancements

• Add redundant_objc_attribute to warn against already implied @objc attribute.
  Daniel Metzing #2193

• Add vertical_whitespace_between_cases opt-in rule to enforce a single empty line between switch cases.
  Cihat Gündüz #1517

• Add multiline_arguments_brackets opt-in rule to warn against multiline function call arguments with surrounding brackets without newline.
  Cihat Gündüz #2306

• Add multiline_literal_brackets opt-in rule to warn against multiline literal arrays & dictionaries with surrounding brackets without newline.
  Cihat Gündüz #2306

• Add multiline_parameters_brackets opt-in rule to warn against multiline function definition parameters with surrounding brackets without newline.
  Cihat Gündüz #2306

• Ignore unspecified modifiers in modifier_order.
  Timofey Solonin #2435

• The lint command now exits with a code of 2 when not using pinned version defined as swiftlint_version in the configuration file.
  Kim de Vos #2074

Bug Fixes

• Fix false positive in nimble_operator rule.
  Marcelo Fabri #2489

• Fix false positives on explicit_type_interface rule when configured with option allowRedundancy set to true.
  Cihat Gündüz #2425

• Only mark custom rules as 'enabled in your config' in the output of the rules command when there are one or more configured custom rules.
  jhildensperger

• Fix wrong correction when removing testable imports with the unused_import rule.
  JP Simard

• Fix false positive with the unused_import rule when importing Foundation when there are attributes in that file requiring Foundation.
  JP Simard

0.29.0: A Laundry List of Changes

Breaking

• SwiftLint now requires Swift 4.2 or higher to build.
  JP Simard

Experimental

• None.

Enhancements

• Improve the performance of saving or reading cached lint results on platforms with CommonCrypto.
  JP Simard

• Add markdown reporter which outputs markdown-formatted tables, ideal for rendering in GitLab or GitHub.
  Dani Vela

• Add testSimulateHomebrewTest() to IntegrationTests that simulates test in homebrew-core/Formula/swiftlint.rb within sandbox.
  Norio Nomura

Bug Fixes

• Fix compiler warnings when building with Swift 4.2 introduced in the last release.
  JP Simard

• Fix false positive in explicit_init rule.
  Dominic Freeston

• Fix toggle_bool false positive violation when comparing object parameter to an equally named variable.
  Timofey Solonin #2471

• Fix false positive on file_name rule with specific patterns.
  Cihat Gündüz #2417

• Fix crash in no_fallthrough_only and potentially other rules when linting files with unicode characters in certain locations.
  JP Simard #2276

• Fix violations with no character/column location not being reported in xcpretty. Now violations with no column location default to a column value of 1 indicating the start of the line.
  JP Simard #2267

0.28.2: EnviroBoost Plus

Breaking

• None.

Experimental

• None.

Enhancements

• Add SWIFTLINT_DISABLE_SOURCEKIT environment variable to allow running SwiftLint without connecting to SourceKit. This will run a subset of rules that don't require SourceKit, which is useful when running in a sandboxed setting such as in Homebrew's CI.
  Norio Nomura

Bug Fixes

• None.

0.28.1: EnviroBoost

This is the last release to support building with Swift 4.0 and Swift 4.1.

Breaking

• None.

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Improve the performance of collecting which files to lint by up to 3.5x.
  JP Simard

• Improve the performance of looking up cached lint results by up to 10x for complex configurations.
  JP Simard

0.28.0: EcoBoost

Breaking

• Completely remove the --use-tabs option of the autocorrect command that was deprecated in 0.24.1. In its place, define an indentation key in your configuration files.
  JP Simard

Experimental

• Add a new swiftlint analyze command which can lint Swift files using the full type-checked AST. Rules of the AnalyzerRule type will be added over time. The compiler log path containing the clean swiftc build command invocation (incremental builds will fail) must be passed to analyze via the --compiler-log-path flag. e.g. --compiler-log-path /path/to/xcodebuild.log
  JP Simard

• Add an explicit_self analyzer rule to enforce the use of explicit references to self. when accessing instance variables or functions.
  JP Simard #321

• Add an unused_import analyzer rule to lint for unnecessary imports.
  JP Simard #2248

• Add an unused_private_declaration analyzer rule to lint for unused private declarations.
  JP Simard

Enhancements

• Add legacy_random opt-in rule to encourage the use of .random(in:) instead of arc4random, arc4random_uniform, and drand48.
  Joshua Kaplan

• Improve performance of line_length and multiple_closures_with_trailing_closure rules.
  Marcelo Fabri

• Add closure_body_length opt-in rule to enforce the maximum number of lines a closure should have. Requires Swift 4.2.
  Ornithologist Coder #52

• Add SonarQube reporter.
  Yusuke Ohashi #2350

• Add prohibited_interface_builder opt-in rule to validate that @IBOutlets and @IBActions are not used.
  Marcelo Fabri #2365

• Add inert_defer rule to validate that defer is not used at the end of a scope.
  Marcelo Fabri #2123

• Add toggle_bool opt-in rule which suggests using someBool.toggle() over someBool = !someBool. Requires Swift 4.2.
  Dalton Claybrook #2369

• Add identical_operands opt-in rule to validate that operands are different expressions in comparisons.
  Marcelo Fabri #1371

• Add collection_alignment opt-in rule to validate that all elements in a collection literal are aligned vertically.
  Dalton Claybrook #2326

• Add static_operator opt-in rule to enforce that operators are declared as static functions instead of free functions.
  Marcelo Fabri #2395

• Specify what type of compiler protocol initializer violated the compiler_protocol_init rule.
  Timofey Solonin #2422

Bug Fixes

• Fix comma rule false positives on object literals (for example, images).
  Marcelo Fabri #2345

• Fix false positive on file_name rule when using nested types.
  Marcelo Fabri #2325

• Fix crash on multiline_function_chains rule when using some special characters inside the function calls.
  Marcelo Fabri #2360

• Change autocorrect --format to run format before autocorrect, fixing conflicts between default indentation and rules which modify indentation (i.e. closure_end_indentation).
  Ornithologist Coder #2374

• Fix false positive on empty_count rule when assessing binary, octal and hexadecimal integer literals.
  Timofey Solonin #2423

0.27.0: Heavy Duty

Breaking

• None.

Enhancements

• Append modifier_order description with failure reason.
  Daniel Metzing #2269

• Decrease default severity of superfluous_disable_command to warning.
  Frederick Pietschmann #2250

• Don't touch files when running autocorrect --format if the contents haven't changed.
  Marcelo Fabri #2249

• Add only_enforce_after_first_closure_on_first_line configuration to multiline_arguments
  Mike Ciesielka #1896

• Add anyobject_protocol opt-in rule which suggests using AnyObject over class for class-only protocols.
  Ornithologist Coder #2283

• Add options prefix_pattern and suffix_pattern to rule file_name.
  Cihat Gündüz #2309

• Add new bool config option if_only to rule conditional_returns_on_newline to specify that the rule should only be applied to if statements.
  Cihat Gündüz #2307

• Add support for globs in excluded file paths.
  Keith Smiley #2316

• Add only_private configuration to prefixed_toplevel_constant rule.
  Keith Smiley #2315

• Make rule explicit_type_interface compatible with rule redundant_type_annotation via new option allow_redundancy.
  Cihat Gündüz #2312

• Add missing_docs rule to warn against undocumented declarations.
  Nef10 Andrés Cecilia Luque #1652

Bug Fixes

• Fix an issue with control_statement where commas in clauses prevented the rule from applying.
  Allen Wu

• Fix explicit_enum_raw_value, generic_type_name, implicit_return, required_enum_case, quick_discouraged_call, array_init, closure_parameter_position and unused_closure_parameter rules when linting with Swift 4.2.
  Marcelo Fabri

• Fix identifier_name rule false positives with enum when linting using Swift 4.2.
  Marcelo Fabri Jacob Greenfield #2231

• Fix a crash when running with Swift 4.2.
  Norio Nomura SR-7954

• Fix false positive on attributes rule when linting a line that is below a line with a declaration that has attributes.
  Marcelo Fabri #2297

• redundant_optional_initialization rule now lints local variables.
  Marcelo Fabri #2233

• Fix autocorrection for redundant_type_annotation rule.
  Marcelo Fabri #2314

0.26.0: Maytagged Pointers

Breaking

• SwiftLint now requires Swift 4.0 or higher to build.
  JP Simard

• The fallthrough rule is now opt-in.
  Marcelo Fabri #1892

Enhancements

• Add optional filename verification to the file_header rule. All occurrences in the pattern of the SWIFTLINT_CURRENT_FILENAME placeholder are replaced by the name of the validated file.
  Anders Hasselqvist #1079

• Updates the untyped_error_in_catch rule to support autocorrection.
  Daniel Metzing

• Add no_fallthrough_only rule to check that case statements do not contain only a fallthrough.
  Austin Belknap

• Add indented_cases support to switch_case_alignment rule.
  Shai Mishali #2119

• Add opt-in modifier_order to enforce the order of declaration modifiers. Requires Swift 4.1 or later.
  Jose Cheyo Jimenez Daniel Metzing #1472 #1585

• Validate implicit subscript getter in implicit_getter rule when using Swift 4.1 or later.
  Marcelo Fabri #898

• Add unavailable_function opt-in rule to validate that functions that are currently unimplemented (using a placeholder fatalError) are marked with @available(*, unavailable).
  Marcelo Fabri #2127

• Updates the closure_end_indentation rule to support autocorrection.
  Eric Horacek

• Updates the literal_expression_end_indentation rule to support autocorrection.
  Eric Horacek

• Add a new multiline_function_chains rule to validate that chained function calls start either on the same line or one per line.
  Eric Horacek #2214

• Improves the mark rule's autocorrection.
  Eric Horacek

• Add redundant_set_access_control rule to warn against using redundant setter ACLs on variable declarations.
  Marcelo Fabri #1869

• Add a new ignores_interpolated_strings config parameter to the line_length rule to ignore lines that include interpolated strings from this rule.
  Michael Gray #2100

• Add a new ignores_default_parameters config parameter to the function_parameter_count rule to ignore default parameter when calculating parameter count. True by default.
  Varun P M #2171

• Add empty_xctest_method opt-in rule which warns against empty XCTest methods.
  Ornithologist Coder #2190

• Add function_default_parameter_at_end opt-in rule to validate that parameters with defaults are located toward the end of the parameter list in a function declaration.
  Marcelo Fabri #2176

• Add file_name opt-in rule validating that file names contain the name of a type or extension declared in the file (if any).
  JP Simard #1420

• Add redundant_type_annotation opt-in rule which warns against unnecessary type annotations for variables.
  Šimon Javora #2239

• Add convenience_type opt-in rule to validate that types hosting only static members should be enums to avoid instantiation.
  Marcelo Fabri #1871

• Support for passing multiple path arguments.
  Ben Asher #810

Bug Fixes

• Update LowerACLThanParent rule to not lint extensions.
  Keith Smiley #2164

• Fix operator usage spacing nested generics false positive.
  Eric Horacek #1341 #1897

• Fix autocorrection for several rules (empty_parentheses_with_trailing_closure, explicit_init, joined_default_parameter, redundant_optional_initialization and unused_closure_parameter ) when used with preprocessor macros.
  John Szumski Marcelo Fabri

• Fix unneeded_parentheses_in_closure_argument false negatives when multiple violations are nested.
  Marcelo Fabri #2188

• Fix false negatives in implicit_return rule when using closures as function arguments.
  Marcelo Fabri #2187

• Fix false positives in attributes rule when @testable is used.
  Marcelo Fabri #2211

• Fix false positives in prohibited_super_call rule.
  Marcelo Fabri #2212

• Fix a false positive in unused_closure_parameter rule when a parameter is used in a string interpolation.
  Marcelo Fabri #2062

• Fixes a case where the closure_end_indentation rule wouldn't lint the end indentation of non-trailing closure parameters.
  Eric Horacek #2121

0.25.1: Lid Locked

This is the last release to support building with Swift 3.2 and Swift 3.3. The next release will require Swift 4.0 or higher to build.

Breaking

• None.

Enhancements

• Add LowerACLThanParent rule.
  Keith Smiley #2136

• Add UIOffsetMake to legacy_constructor rule.
  Nealon Young #2126

• Add a new excluded config parameter to the explicit_type_interface rule to exempt certain types of variables from the rule.
  Rounak Jain #2028

• Add empty_string opt-in rule to validate against comparing strings to "" instead of using .isEmpty.
  Davide Sibilio

• Add untyped_error_in_catch opt-in rule to warn against declaring errors without an explicit type in catch statements instead of using the implicit error variable.
  Daniel Metzing #2045

• Add all keyword for use in disable / enable statement: // swiftlint:disable all. It allows disabling SwiftLint entirely, in-code, for a particular section.
  fredpi #2071

• Adds --force-exclude option to lint and autocorrect commands, which will force SwiftLint to exclude files specified in the config excluded even if they are explicitly specified with --path.
  Ash Furrow #2051

• Adds discouraged_optional_collection opt-in rule to encourage the use of empty collections instead of optional collections.
  Ornithologist Coder #1885

• Add 4.1.0, 4.1.1 and 4.2.0 to Swift version detection.
  Norio Nomura #2143

• Support building with Swift 4.1.
  Norio Nomura #2038

Bug Fixes

• Fixes an issue with the yoda_condition rule where the severity would always display as a warning, and the reason would display as the severity type.
  Twig

• Fix TODOs lint message to state that TODOs should be resolved instead of avoided.
  Adonis Peralta #150

• Fix some cases where colon rule wouldn't autocorrect dictionary literals.
  Marcelo Fabri #2050

• Fix linux crash on sources with surrogate pair emojis as variable names.
  Cyril Lashkevich

• Make legacy_constructor rule more reliable, especially for autocorrecting.
  Marcelo Fabri #2098

• Fix colon rule autocorrect when preprocessor macros are present.
  Marcelo Fabri #2099

• Fix crash when saving cache if there're entries referring to the same path but with different capitalization.
  Marcelo Fabri #2032

• Fix several rules (empty_enum_arguments, explicit_init empty_parentheses_with_trailing_closure, joined_default_parameter, redundant_optional_initialization, redundant_void_return and unused_closure_parameter) rules autocorrection inside functions or other declarations.
  Marcelo Fabri

• Fix redundant_void_return rule autocorrect when preprocessor macros are present.
  John Szumski #2115

• Fix issue where the autocorrect done message used the plural form of "files" even if only 1 file changed.
  John Szumski

• Fix false positives in attributes rule when using Swift 4.1.
  Marcelo Fabri #2125 #2141

0.25.0: Cleaning the Lint Filter

Breaking

• None.

Enhancements

• Adds discouraged_optional_boolean opt-in rule to discourage the use of optional booleans.
  Ornithologist Coder #2011

Bug Fixes

• Fix some cases where colon rule wouldn't be autocorrected.
  Manabu Nakazawa

• Fix false positives in explicit_acl rule when declaring functions and properties in protocols or implementing deinit.
  Marcelo Fabri #2014

• Fix false negatives in unneeded_parentheses_in_closure_argument rule when using _ as one of the closure arguments.
  Marcelo Fabri #2017

• Fix several rules that use attributes when linting with a Swift 4.1 toolchain.
  Marcelo Fabri #2019

• Don't trigger violations in let_var_whitespace rule when using local variables when linting with a Swift 4.1 toolchain.
  Marcelo Fabri #2021

• Improve type_name rule violations to be positioned on the type name.
  Marcelo Fabri #2021

• Use SourceKit to validate associatedtype and typealias in type_name rule when linting with Swift 4.1.
  Marcelo Fabri #2021

• Fix some cases where violations would still be triggered when using the  ignores_function_declarations configuration of line_length rule.
   Manabu Nakazawa

• Fix false positive in empty_enum_arguments rule when using closures.
  Marcelo Fabri #2041

• Fix false positives in force_unwrapping rule when declaring functions that return implicitly unwrapped collections (for example [Int]! or [AnyHashable: Any]!).
  Marcelo Fabri #2042

• Fix directories with a .swift suffix being treated as files.
  Jamie Edge #1948

0.24.2: Dented Tumbler

Breaking

• None.

Enhancements

• None.

Bug Fixes

• No longer log if the indentation key isn't set in the configuration file.
  JP Simard #1998

0.24.1: Dented Tumbler

Breaking

• None.

Enhancements

• Invalidate cache when Swift patch version changes.
  Norio Nomura

• Add private_action opt-in rule which warns against public @IBAction methods.
  Ornithologist Coder #1931

• Add yoda_condition opt-in rule which warns when Yoda conditions are used. That is, when the constant portion of the expression is on the left side of a conditional statement.
  Daniel Metzing #1924

• Indentation can now be specified via a configuration file.
  Noah McCann RubenSandwich #319

• Add required_enum_case opt-in rule which allows enums that conform to protocols to require one or more cases. Useful for result enums.
  Donald Ritter

• Add discouraged_object_literal opt-in rule which encourages initializers over object literals.
  Ornithologist Coder #1987

• Adds prefixed_toplevel_constant opt-in rule which encourages top-level constants to be prefixed by k.
  Ornithologist Coder #1907

• Added explicit_acl opt-in rule to enforce explicit access control levels.
  Josep Rodriguez #1822

Bug Fixes

• Fix false positives in control_statement rule when methods with keyword names are used.
  Marcelo Fabri #1946

• Fix false positives in for_where rule when pattern matching (if case) is used.
  Marcelo Fabri #1968

• Fix false positives in unused_closure_parameter rule when closure is wrapped in parentheses.
  JP Simard #1979

0.24.0: Timed Dry

Breaking

• SwiftLint now requires Xcode 9 and Swift 3.2+ to build.
  Marcelo Fabri

• Remove SwiftExpressionKind.other.
  Marcelo Fabri

Enhancements

• Add sorted_first_last opt-in rule to encourage using min() or max() over sorted().first or sorted().last.
  Tom Quist #1932

• Add quick_discouraged_focused_test opt-in rule which warns against focused tests in Quick tests.
  Ornithologist Coder #1905

• Add override_in_extension opt-in rule that warns against overriding declarations in an extension.
  Marcelo Fabri #1884

• Add [f,x]{describe, context, itBehavesLike} to quick_discouraged_call rule.
  Ornithologist Coder #1903

• Add quick_discouraged_pending_test opt-in rule which warns against pending tests in Quick tests.
  Ornithologist Coder #1909

• Speed up equality tests for [Rule] and Configuration values.
  JP Simard

• Make Configuration conform to Hashable.
  JP Simard

• Speed up reading cached results by about 200%.
  JP Simard

• Add catch to the statements checked by the control_statement rule.
  JP Simard

• Make sorted_imports correctable.
  Samuel Susla JP Simard #1822

• Make sorted_imports only validate within "groups" of imports on directly adjacent lines.
  Samuel Susla JP Simard #1822

Bug Fixes

• Extend first_where and contains_over_first_not_nil rules to also detect cases where calls to filter and first are parenthesized.
  Tom Quist

• Correct equality tests for Configuration values. They previously didn't account for warningThreshold or cachePath.
  JP Simard

• Fix false positive in multiline_parameters rule when parameter is a closure with default value.
  Ornithologist Coder #1912

• Fix caching on Linux.
  JP Simard

• Fix crashes due to races.
  JP Simard

• Fix String.characters deprecation warnings when compiling with Swift 4.0.2.
  JP Simard

0.23.1: Rewash: Forgotten Load Edition

Breaking

• None.

Enhancements

• None.

Bug Fixes

• Fix false positive in array_init rule when using a map that doesn't take a closure.
  Marcelo Fabri #1878

• superfluous_disable_command rule can now be disabled as expected when using // swiftlint:disable superfluous_disable_command.
  Marcelo Fabri #1890

0.23.0: Permanent Press Cycle

Breaking

• None.

Enhancements

• Fix csv reporter to output records with new lines.
  atetlaw

• Add contains_over_first_not_nil rule to encourage using contains over first(where:) != nil.
  Samuel Susla #1514

• Add fallthrough rule that flags usage of fallthrough.
  Marcelo Fabri #1834

• Improve colon rule to catch violations in dictionary types (e.g. [String: Int]), when using Any and on function calls.
  Marcelo Fabri #1074 #1389

• Add switch_case_alignment rule to validate that case and default statements are vertically aligned with their enclosing switch statement.
  Austin Lu

• Add array_init opt-in rule to validate that Array(foo) should be preferred over foo.map({ $0 }).
  Marcelo Fabri #1271

• Truncate long configuration console descriptions to fit in the console window when running swiftlint rules.
  JP Simard #1002

• Add multiline_arguments opt-in rule that warns to either keep all the arguments of a function call on the same line, or one per line.
  Marcel Jackwerth

• Add unneeded_break_in_switch rule to validate that no extra breaks are added in switch statements.
  Marcelo Fabri #1870

• Add literal_expression_end_indentation opt-in rule to validate that array and dictionary literals ends have the same indentation as the line that started them.
  Marcelo Fabri #1435

Bug Fixes

• Improve how opening_brace rule reports violations locations.
  Marcelo Fabri #1811

• Fix false negatives in unneeded_parentheses_in_closure_argument rule when using capture lists.
  Marcelo Fabri #1817

• Fix handling of attributes (lazy, objc, etc.) for the let_var_whitespace rule.
  David Catmull #1770 #1812

• Fix false positives in for_where rule when using if var inside for.
  Marcelo Fabri #1838

• Fix false positive in class_delegate_protocol rule when using Swift 4.0.1.
  Marcelo Fabri #1856

• Print multi-line configuration values in a single line when running swiftlint rules to avoid breaking the table format.
  JP Simard #1002

• Ignore SwiftLint commands (swiftlint:(disable|enable)) in file_header rule, making it work better with superfluous_disable_command rule.
  Marcelo Fabri #1810

• Fix false negatives in generic_type_name, identifier_name and type_name rules when using allowed_symbols.
  Marcelo Fabri

0.22.0: Wrinkle-free

Breaking

• Nested configurations will now be merged with parent configurations rather than replace them outright.
  Stéphane Copin JP Simard #676

Enhancements

• Add is_disjoint rule to encourage using Set.isDisjoint(with:) over Set.intersection(_:).isEmpty.
  JP Simard

• Add xctfail_message rule to enforce XCTFail calls to include a description of the assertion.
  Ornithologist Coder #1370

• Add joined_default_parameter correctable opt-in rule to discourage explicit usage of the default separator.
  Ornithologist Coder #1093 #1757

• Files with extensions other than .swift can now be used as arguments to --file when linting or autocorrecting.
  Marcelo Fabri #1721

• Allow ()?, Void?, ()!, and Void! as return types in redundant_void_return rule.
  Ryan Booker #1761

• Add single_test_class opt-in rule to validate that test files only contain a single QuickSpec or XCTestCase subclass.
  Ornithologist Coder #1779

• Produce an error when a // swiftlint:disable command does not silence any violations.
  JP Simard #1102

• Add quick_discouraged_call opt-in rule to discourage calls and object initialization inside 'describe' and 'context' block in Quick tests.
  Ornithologist Coder #1781

• Invalidate cache when Swift version changes.
  Marcelo Fabri

• Add pattern_matching_keywords opt-in rule to enforce moving let and var keywords outside tuples in a switch.
  Marcelo Fabri #202

• Add explicit_enum_raw_value opt-in rule to allow refactoring the Swift API without breaking the API contract.
  Mazyod #1778

• Add no_grouping_extension opt-in rule to disallow the use of extensions for code grouping purposes within the same file.
  Mazyod #1767

• Improve syntactic_sugar violation message to be type-specific.
  Marcelo Fabri #1803

• Add multiple_closures_with_trailing_closure rule that disallows trailing closure syntax when passing more than one closure argument to a function.
  Erik Strottmann #1801

Bug Fixes

• Fix false positive on force_unwrapping rule when declaring local variable with implicity unwrapped type.
  Otávio Lima #1710

• Fix the warning message and autocorrection of vertical_whitespace rule to display the maximum empty lines allowed if max_empty_lines is greater than 1.
  Hossam Ghareeb #1763

• Fix for the wrong configuration being used when using --path and a configuration exists in a parent directory.
  Marcelo Fabri #1744

• Fix false positive on unused_enumerated rule with complex variable bindings.
  Marcelo Fabri #1787

• Fix incorrect violations and autocorrections on unneeded_parentheses_in_closure_argument rule that were generated in some cases (mainly when using chained method calls with closures).
  Marcelo Fabri

0.21.0: Vintage Washboard

Breaking

• Xcode 8.3 or later and Swift 3.1 or later are required to build.
  Norio Nomura

Enhancements

• Rules are now categorized as lint, idiomatic, style, metrics or performance. Currently this is just used for documentation purposes when you run swiftlint rules or swiftlint generate-docs.
  Marcelo Fabri

• Add rules documentation generation.
  Marcelo Fabri #1078

• Add private_over_fileprivate correctable rule to check for top-level usages of fileprivate and recommend private instead. This is in line with SE-0169's goal "for fileprivate to be used rarely". There is a also a new strict_fileprivate opt-in rule that will mark every fileprivate as a violation (especially useful with Swift 4).
  Jose Cheyo Jimenez Marcelo Fabri #1469 #1058

• Add let_var_whitespace opt-in rule to enforce that let/var declarations should be separated from other statements by a single blank line.
  Uncommon #1461

• Improve performance when linting and correcting on Linux, matching macOS behavior.
  JP Simard #1577

• Don't trigger implicit_getter violations when attributes (such as mutating or @inline) are present.
  Marcelo Fabri #1309 #1589

• Add --use-tabs option to AutoCorrectOptions, enabling formatting using tabs over spaces.
  Cody Winton #1327

• Improve autocorrect performance by running it in parallel.
  Marcelo Fabri #1578

• Support building with Xcode 9 beta 3 in Swift 3.2 mode.
  JP Simard

• Add support for optional error severity level configuration.
  Jamie Edge Marcelo Fabri #1647

• Add unneeded_parentheses_in_closure_argument opt-in correctable rule that warns against using parentheses around argument declarations in closures.
  Marcelo Fabri #1483

• Add --disabled flag to swiftlint rules to print only rules that are not enabled in the configuration.
  Marcelo Fabri

• Add ignore_comment_only_lines boolean configuration option to file_length rule. With the option enabled, file_length will ignore lines which have only comments.
  Samuel Susla #1165

• Improve file_header rule description.
  Marcelo Fabri #1492

• Add trailing_closure opt-in rule that validates that trailing closure syntax should be used whenever possible.
  Marcelo Fabri #54

• Shebang (#!) in the beginning of a file is now ignored by all rules.
  Marcelo Fabri #1294

• Add block_based_kvo rule that enforces the usage of the new block based KVO API added when linting with Swift 3.2 or later.
  Marcelo Fabri #1714

• Make file_header rule ignore doc comments.
  Marcelo Fabri #1719

• Allow using environment variables in a configuration file in the form of ${SOME_VARIABLE}. The variables will be expanded when the configuration is first loaded.
  Marcelo Fabri #1512

• Treat yes, no, on and off as strings (and not booleans) when loading configuration files.
  Marcelo Fabri #1424

• Add discouraged_direct_init rule that discourages direct initialization of certain types.
  Ornithologist Coder #1306

Bug Fixes

• Fix false positive on redundant_discardable_let rule when using while statements.
  Marcelo Fabri #1669

• Fix all custom rules not being applied when any rule is configured incorrectly.
  Jamie Edge #1586

• Fix crash when using --config with a relative path and --path with a file.
  Marcelo Fabri #1694

• Fix mark rule corrections generating invalid code in some cases.
  Marcelo Fabri #1029

• Fix false positive in empty_enum_arguments rule when using wildcards and where clauses.
  Marcelo Fabri #1722

• Fix false positive in large_tuple rule when using throwing closure.
  Liquidsoul

• Make vertical_parameter_alignment more robust, fixing false positives and detecting previously missed violations.
  JP Simard #1488

0.20.1: More Liquid Fabric Softener

Breaking

• None.

Enhancements

• None.

Bug Fixes

• Fix typo in FatalErrorMessageRule.
  Alexander Lash

• Don't trigger an extension_access_modifier violation when all extension members are open, as open extension is not supported by Swift.
  Marcelo Fabri #1629

• Don't trigger a vertical_parameter_alignment_on_call violation when trailing closures are used.
  Marcelo Fabri #1635

• Make vertical_parameter_alignment_on_call more flexible when multiline parameters are used.
  Marcelo Fabri #1630 #1643

• Use the directory's .swiftlint.yml when --path is used.
  Marcelo Fabri #1631

0.20.0: Liquid Fabric Softener

Breaking

• None.

Enhancements

• Detect more violations of force_unwrapping when using subscripts.
  Otávio Lima

• Match (Void) as return type in the void_return rule.
  Anders Hasselqvist

• Add multiline_parameters opt-in rule that warns to either keep all the parameters of a method or function on the same line, or one per line.
  Ornithologist Coder

• Update function_parameter_count rule to ignore overridden methods.
  Markus Gasser #1562

• Skip files with valid cache & no violations when auto correcting.
  Marcelo Fabri #1554

• Don't trigger violations from the private_unit_test rule when a method has parameters.
  Marcelo Fabri #1532

• Don't trigger violations from the discarded_notification_center_observer rule when the observer is being returned from a function that is not marked as @discardableResult.
  Marcelo Fabri #1525

• Add extension_access_modifier opt-in rule validating that if all the declarations in a given extension have the same Access Control Level, the ACL keyword should be applied to the top-level extension.
  Marcelo Fabri #1546

• Add vertical_parameter_alignment_on_call opt-in rule that validates that parameters are vertically aligned on a method call.
  Marcelo Fabri #1037

• Add code_literal and image_literal boolean configuration options to object_literal rule. They allow to only check for one or the other literal type instead of both together.
  Cihat Gündüz #1587

Bug Fixes

• Fix false positive in empty_enum_arguments rule when calling methods.
  Marcelo Fabri #1597

• Fix crash in unused_closure_parameter rule when using unicode identifiers.
  Woo-Sik Byun Marcelo Fabri

• Fix two false positives in force_unwrapping rule.
  Otávio Lima #614 #977 #1614

• Fix custom rules not working correctly with comment commands.
  JP Simard #1558

• Fix incorrectly using configuration files named .swiftlint.yml when they are located in the same directory as a differently-named, user-provided custom configuration file.
  JP Simard #1531

• Fix empty_count rule false positive in words that include "count".
  Marcelo Fabri #1622

• Use validates_start_with_lowercase key when decoding configurations for generic_type_name, identifier_name and type_name rules. This key was used on the docs, but internally validates_start_lowercase was used.
  Marcelo Fabri #1626

0.19.0: Coin-Operated Machine

Breaking

• Remove support for Swift 2.
  Marcelo Fabri #1453

• Remove missing_docs and valid_docs rules since they were already disabled.
  Marcelo Fabri #1453

• Add modificationDate(forFileAtPath:) function requirement to LintableFileManager protocol.
  Victor Pimentel

• Several breaking changes to LinterCache.
  Victor Pimentel JP Simard

• Remove Configuration.hash property.
  Victor Pimentel

• Rename ConditionalReturnsOnNewline struct to ConditionalReturnsOnNewlineRule to match rule naming conventions.
  JP Simard

Enhancements

• Cache linter results for files unmodified since the previous linter run.
  Victor Pimentel JP Simard Marcelo Fabri #1184 #1550

• Add opt-in configurations to generic_type_name, identifier_name and type_name rules to allow excluding non-alphanumeric characters and names that start with uppercase.
  Javier Hernández #541

• Adds support for excluded in custom rules to exclude files.
  Nigel Flack #1437

• Make trailing_comma rule autocorrectable.
  Samuel Susla Jeremy David Giesbrecht #1326

• Added no_extension_access_modifier opt-in rule to disallow access modifiers completely, à la SE-0119.
  Jose Cheyo Jimenez #1457

• Add lowercase and missing colon checks to the mark rule.
  Jason Moore

• Improve violation reason wording in function_body_length, large_type, and type_body_length rules.   ultimatedbz

• Add explicit_top_level_acl opt-in rule that validates that all top level declarations should explicitly be marked with an Access Control Level (private, fileprivate, internal, public or open).
  J. Cheyo Jimenez Marcelo Fabri #58

• Add implicit_return opt-in rule that warns against using the return keyword when it can be omitted inside closures.
  Marcelo Fabri #1194

• Add option to unused_optional_binding rule to ignore try? in guard statements.
  Sega-Zero #1432

• Add empty_enum_arguments correctable rule that warns against using silent associated values inside a case.
  Marcelo Fabri #1425 #1549

• Remove file.zip from the Pods directory when installing SwiftLint via CocoaPods.
  Hesham Salman #1507

• Add protocol_property_accessors_order correctable rule that validates that the order of accessors is get set when declaring variables in protocols.
  Marcelo Fabri #1504

• Make Region & Command structs conform to Equatable.
  JP Simard

• Make closure_spacing a CorrectableRule.
  J. Cheyo Jimenez

Bug Fixes

• emoji and checkstyle reporter output report sorted by file name.
  norio-nomura #1429

• Prevent false positive in shorthand_operator rule.
  sammy-SC #1254

• Fix typo in DiscardedNotificationCenterObserverRule.
  Spencer Kaiser

• Fix empty_parameters rule with Swift 3.
  Marcelo Fabri #1460

• Prevent triggering redundant_optional_initialization rule on a lazy var since it needs initialization.
  Marcelo Fabri #1334

• Fix ignores_case_statements key in cyclomatic_complexity description.
  Jeff Blagdon #1434

• Fall back to reporting violations on line 1 if no line was provided for the violation's location, ensuring Xcode always displays the warning or error.
  rjhodge JP Simard #1520

• Fix crash or incorrect violation location with strings including multi-byte unicode characters.
  Marcelo Fabri #1006

• Fix false positive in syntactic_sugar rule when using nested types named Optional, ImplicitlyUnwrappedOptional, Array or Dictionary.
  Marcelo Fabri #1508

• Fix false positives in prohibited_super_call & overridden_super_call rules where calls to super were done in nested scopes such as defer blocks.
  JP Simard #1301

• Fix non-root configurations logging configuration warnings more than once.
  JP Simard #949

• Fix some overlapping // swiftlint commands not being applied.
  JP Simard #1388

0.18.1: Misaligned Drum

Breaking

• None.

Enhancements

• None.

Bug Fixes

• Compile releases in the 'Release' configuration rather than 'Debug'.

0.18.0: Misaligned Drum

Breaking

• Replace YamlSwift with Yams. SwiftLint no longer includes YamlSwift. If your project implicitly depends on YamlSwift, you need to modify it to depend on YamlSwift explicitly.
  norio-nomura #1412

• Yams interprets YAML more strictly than YamlSwift, so if your YAML configurations previously worked with SwiftLint but didn't fully conform to the YAML 1.2 standard, you'll need to fix those validation errors. For example:

  custom_rules:
    wrong_regex:
      name: "wrong regex"
      regex: "((assert|precondition)\(false)" # '\' in "" means escape sequence
    strict_regex:
      name: "strict regex"
      regex: '((assert|precondition)\(false)' # Use single quotes

Enhancements

• Support compiling with Xcode 8.3 and Swift 3.1.
  Keith Smiley

• Fix false positives on for_where rule and skip violation on complex conditions.
  Marcelo Fabri #1387

• Print YAML configuration errors in locatable format compatible with Xcode's Issue Navigator.
  

Bug Fixes

• Fix --lenient enforcement not being applied to all violations.
  aaroncrespo #1391

• Fix false positives in unused_optional_binding rule.
  Daniel Rodríguez Troitiño #1376

• Fix false positives in redundant_discardable_let rule.
  Jeremy David Giesbrecht #1415

0.17.0: Extra Rinse Cycle

Breaking

• variable_name rule (VariableNameRule) is now identifier_name (IdentifierNameRule) as it validates other identifiers as well.
  Marcelo Fabri #663

• Fix sorted_imports rule to sort ignoring case.
  Keith Smiley #1185

• Temporarily disable cache when linting. This will be re-enabled in a future version after important cache-related issues have been addressed.
  Marcelo Fabri

Enhancements

• Add implicitly_unwrapped_optional opt-in rule that warns against using implicitly unwrapped optionals, except cases when this IUO is an IBOutlet.
  Siarhei Fedartsou #56

• Performance improvements to generic_type_name, redundant_nil_coalescing, mark, first_where and vertical_whitespace rules.
  Marcelo Fabri

• Add discarded_notification_center_observer rule that warns when the result of NotificationCenter.addObserver(forName:object:queue:using:) is not stored so it can be removed later.
  Marcelo Fabri #1062

• Add notification_center_detachment rule that warns against an object removing itself from NotificationCenter in an unsafe location.
  Marcelo Fabri #1061

• Accept AnyObject and NSObjectProtocol in class_delegate_protocol.
  Jon Shier #1261

• Add ignores_function_declarations and ignores_comments as options to LineLengthRule.
  Michael L. Welles #598 #975

• Add for_where rule that validates that where is used in a for loop instead of a single if expression inside the loop.
  Marcelo Fabri #1228

• unused_enumerated rule now warns when only the index is being used. You should use .indices instead of .enumerated() in this case.
  Marcelo Fabri #1278

• Add ignores_case_statements as option to CyclomaticComplexityRule.
  Michael L. Welles #1298

• Add correctable redundant_discardable_let rule that warns when let _ = foo() is used to discard a result from a function instead of _ = foo().
  Marcelo Fabri #1232

• Accept global and local variables in implicit_getter rule.
  Marcelo Fabri

• Add --enabled (or -e) switch to the rules CLI command, to only display enabled rules.
  Natan Rolnik #1270

• Now nesting rule can be configured with a type and statement level.
  Hayashi Tatsuya #1318

• Add explicit_type_interface opt-in rule that validates that the properties have an explicit type interface.
  Kim de Vos

• Add --lenient CLI option to lint command. Facilitates running a lint task that doesn't fail a pipeline of other tasks.
  aaroncrespo #1322

• Add fatal_error_message opt-in rule that validates that fatalError() calls have a message.
  Kim de Vos #1348

Bug Fixes

• Fix crashes when accessing cached regular expressions when linting in parallel.
  JP Simard #1344

• Fix a false positive on large_tuple rule when using closures.
  Marcelo Fabri #1234

• Fix force_unwrap false positive for bool negation.
  Aaron McTavish #918

• Fix false positive and wrong correction on number_separator rule.
  Marcelo Fabri #1242

• Retain closure parameter types when they are specified during autocorrect.
  Allen Zeng #1175

• Fix redundant_void_return matches if return type starts with Void~.
  Hayashi Tatsuya

• Ignore unused_closure_parameter rule on closures that are called inline.
  Marcelo Fabri #1161

• Disable valid_docs and missing_docs rules when running in Swift 2.3 or later as they have not been updated to work with those versions of Swift. Both rules are now opt-in because of this.
  JP Simard #728

• Fix false positive on large_tuple rule when using generics inside a tuple.
  Marcelo Fabri #1257

• Make ASTRule default implementation to navigate through the substructure even if its children are from a different kind. This fixes some violations not being reported in some contexts.
  Marcelo Fabri #1237

• Reimplement switch_case_on_newline rule to be an ASTRule and be more reliable, fixing some false negatives and false positives.
  Marcelo Fabri #1268

• Fix closure_end_indentation rule false positive when using single-line closures.
  Marcelo Fabri #1216

• Fix todo rule messages when the comment is not on a new line.
  Marcelo Fabri #1304

• Fix false negative on unused_closure_parameter rule.
  Hayashi Tatsuya

• Fix checkstyle report format.
  Yuki Oya

0.16.1: Commutative Fabric Sheets

Breaking

• None.

Enhancements

• Improve unused_optional_binding rule on tuples check.
  Rafael Machado

• Update variable_name to ignore overrides.
  Aaron McTavish #1169

• Update number_separator rule to allow for specifying minimum length of fraction.
  Bjarke Søndergaard #1200

• Update legacy_constant rule to support CGFloat.pi and Float.pi.
  Aaron McTavish #1198

Bug Fixes

• Fix false positives on shorthand_operator rule.
  Marcelo Fabri #1156 #1163

• Fix false positive on redundant_optional_initialization rule.
  Marcelo Fabri #1159

• Fix false positive on operator_usage_whitespace rule with decimal literals in exponent format.
  Marcelo Fabri #1153

• Fix excluded configuration not excluding files.
  Marcelo Fabri #1166

• Disable commutative operations on shorthand_operator rule.
  Marcelo Fabri #1182 #1183 #1211

• Fix crash when running in a Sandboxed environment, which also fixes Homebrew distribution. Set the SWIFTLINT_SWIFT_VERSION environment variable to either 2 or 3 to force that operation mode, bypassing the Swift version determined from SourceKit.
  JP Simard

0.16.0: Maximum Energy Efficiency Setting

Breaking

• Several API breaking changes were made to conform to the Swift 3 API Design Guidelines. We apologize for any inconvenience this may have caused.

Enhancements

• Speed up linting by caching linter results across invocations.
  Marcelo Fabri #868

• Speed up linting by processing multiple files and rules concurrently.
  JP Simard #1077

• Make many operations in SwiftLintFramework safe to call in multithreaded scenarios, including accessing Linter.styleViolations.
  JP Simard #1077

• Permit unsigned and explicitly-sized integer types in valid_ibinspectable
  Daniel Duan

• Make nimble_operator rule correctable.
  Vojta Stavik

• Add vertical_parameter_alignment rule that checks if parameters are vertically aligned for multi-line function declarations.
  Marcelo Fabri #1033

• Add more helpful reason strings to TrailingCommaRule.
  Matt Rubin

• Add class_delegate_protocol rule that warns against protocol declarations that aren't marked as : class or @objc.
  Marcelo Fabri #1039

• Add correctable redundant_optional_initialization rule that warns against initializing optional variables with nil.
  Marcelo Fabri #1052

• redundant_nil_coalescing rule is now correctable.
  Marcelo Fabri

• Make number_separator rule correctable.
  Marcelo Fabri

• empty_parentheses_with_trailing_closure rule is now correctable.
  Marcelo Fabri

• Add correctable redundant_void_return rule that warns against explicitly adding -> Void to functions.
  Marcelo Fabri #1066

• Add an opt-in rule that enforces alphabetical sorting of imports.
  Scott Berrevoets #900

• type_name rule forces enum values to be UpperCamelCase again when used with Swift 2.3.
  Marcelo Fabri #1090

• Make weak_delegate rule ignore computed properties.
  Rafael Machado #1089

• Add object_literal opt-in rule that warns against using image and color inits that can be replaced for #imageLiteral or #colorLiteral in Swift 3.
  Marcelo Fabri #1060

• Now number_separator rule can be configured with a minimum length.
  Marcelo Fabri #1109

• Add compiler_protocol_init rule that flags usage of initializers declared in protocols used by the compiler such as ExpressibleByArrayLiteral that shouldn't be called directly. Instead, you should use a literal anywhere a concrete type conforming to the protocol is expected by the context.
  Marcelo Fabri #1096

• Add large_tuple configurable rule that validates that tuples shouldn't have too many members.
  Marcelo Fabri #1065

• Add generic_type_name rule that validates generic constraint type names.
  Marcelo Fabri #51

• Update vertical_whitespace rule to allow configuration of the number of consecutive empty lines before a violation using max_empty_lines. The default value is still 1 line.
  Aaron McTavish #769

• Add check to ignore urls in line_length rule when ignores_urls configuration is enabled.
  Javier Hernández #384

• Add shorthand_operator rule that validates that shorthand operators should be used when possible.
  Marcelo Fabri #902

• Allow specifying a swiftlint_version configuration key which will log a warning if the current running version of SwiftLint is different than this value.
  JP Simard #221

• Add internal support for deprecated rule aliases.
  Marcelo Fabri #973

• Add unused_optional_binding rule that will check for optional bindings not being used.
  Rafael Machado #1116

Bug Fixes

• Ignore close parentheses on vertical_parameter_alignment rule.
  Marcelo Fabri #1042

• syntactic_sugar rule now doesn't flag declarations that can't be fixed.
  Marcelo Fabri #928

• Fix false positives on closure_parameter_position and unused_closure_parameter rules with Swift 2.3.
  Marcelo Fabri #1019

• Fix crash on trailing_comma rule with Swift 2.3.
  Marcelo Fabri #921

• Fix out of range exception in AttributesRule.
  JP Simard #1105

• Fix variable_name and type_name rules on Linux.
  Marcelo Fabri

• Fix linting directories with names ending with .swift.
  JP Simard

• Fix running swiftlint version when building with Swift Package Manager.
  Marcelo Fabri #1045

• Fix false positive on vertical_parameter_alignment rule when breaking line in a default parameter declaration.
  Marcelo Fabri #1129

0.15.0: Hand Washable Holiday Linens 🎄

Breaking

• line_length rule now has a default value of 120 for warnings.
  Marcelo Fabri #1008

Enhancements

• Add closure_end_indentation opt-in rule that validates closure closing braces according to these rules:

  • If the method call has chained breaking lines on each method (. is on a new line), the closing brace should be vertically aligned with the ..
  • Otherwise, the closing brace should be vertically aligned with the beginning of the statement in the first line.

  Marcelo Fabri #326

• operator_usage_whitespace rule is now correctable.
  Marcelo Fabri

• implicit_getter and mark rule performance improvements.
  Marcelo Fabri

• HTML reports now display a relative path to files.
  Jamie Edge

• colon rule now validates colon position in dictionaries too. You can disable this new validation with the apply_to_dictionaries configuration.
  Marcelo Fabri #603

• Add first_where opt-in rule that warns against using .filter { /* ... */ }.first in collections, as .first(where: { /* ... */ }) is often more efficient.
  Marcelo Fabri #1005

Bug Fixes

• FunctionParameterCountRule also ignores generic initializers.
  Mauricio Hanika

• Grammar checks.
  Michael Helmbrecht

• Fix the validity and styling of the HTML reporter.
  Jamie Edge

• Fix false positive in empty_parentheses_with_trailing_closure rule.
  Marcelo Fabri #1021

• Fix false positive in switch_case_on_newline when switching over a selector.
  Marcelo Fabri #1020

• Fix crash in closure_parameter_position rule.
  Marcelo Fabri #1026

• Fix false positive in operator_usage_whitespace rule when using image literals.
  Marcelo Fabri #1028

0.14.0: Super Awesome Retractable Drying Rack

Breaking

• SwiftLint now requires Xcode 8.x and Swift 3.x to build. APIs have not yet been adapted to conform to the Swift 3 API Design Guidelines but will shortly.
  JP Simard Norio Nomura

Enhancements

• Now builds and passes most tests on Linux using the Swift Package Manager with Swift 3. This requires libsourcekitdInProc.so to be built and located in /usr/lib, or in another location specified by the LINUX_SOURCEKIT_LIB_PATH environment variable. A preconfigured Docker image is available on Docker Hub by the ID of norionomura/sourcekit:302.
  JP Simard Norio Nomura #732

• Add dynamic_inline rule to discourage combination of @inline(__always) and dynamic function attributes.
  Daniel Duan

• Add number_separator opt-in rule that enforces that underscores are used as thousand separators in large numbers.
  Marcelo Fabri #924

• Add file_header opt-in rule that warns when a file contains a copyright comment header, such as the one Xcode adds by default.
  Marcelo Fabri #844

• FunctionParameterCountRule now ignores initializers.
  Denis Lebedev #544

• Add EmojiReporter: a human friendly reporter.
  Michał Kałużny

• Add redundant_string_enum_value rule that warns against String enums with redundant value assignments.
  Marcelo Fabri #946

• Add attributes opt-in rule which validates if an attribute (@objc, @IBOutlet, @discardableResult, etc) is in the right position:

  • If the attribute is @IBAction or @NSManaged, it should always be on the same line as the declaration
  • If the attribute has parameters, it should always be on the line above the declaration
  • Otherwise:
    • if the attribute is applied to a variable, it should be on the same line
    • if it's applied to a type or function, it should be on the line above
    • if it's applied to an import (the only option is @testable import), it should be on the same line. You can also configure what attributes should be always on a new line or on the same line as the declaration with the always_on_same_line and always_on_line_above keys.

  Marcelo Fabri #846

• Add empty_parentheses_with_trailing_closure rule that checks for empty parentheses after method call when using trailing closures.
  Marcelo Fabri #885

• Add closure_parameter_position rule that validates that closure parameters are in the same line as the opening brace.
  Marcelo Fabri #931

• type_name rule now validates typealias and associatedtype too.
  Marcelo Fabri #49 #956

• Add ProhibitedSuperRule opt-in rule that warns about methods calling to super that should not, for example UIViewController.loadView().
  Aaron McTavish #970

• Add correctable void_return rule to validate usage of -> Void over -> ().
  Marcelo Fabri JP Simard #964

• Add correctable empty_parameters rule to validate usage of () -> over Void -> .
  Marcelo Fabri #573

• Add operator_usage_whitespace opt-in rule to validate that operators are surrounded by a single whitespace when they are being used.
  Marcelo Fabri #626

• Add unused_closure_parameter correctable rule that validates if all closure parameters are being used. If a parameter is unused, it should be replaced by _.
  Marcelo Fabri JP Simard #982

• Add unused_enumerated rule that warns against unused indexes when using .enumerated() on a for loop, e.g. for (_, foo) in bar.enumerated().
  Marcelo Fabri #619

Bug Fixes

• Fix weak_delegate rule reporting a violation for variables containing but not ending in delegate.
  Phil Webster

• Fix weak_delegate rule reporting a violation for variables in protocol declarations.
  Marcelo Fabri #934

• Fix trailing_comma rule reporting a violation for commas in comments.
  Marcelo Fabri #940

• Fix XML reporters not escaping characters.
  Fabian Ehrentraud #968

• Fix specifying multiple rule identifiers in comment commands.
  JP Simard #976

• Fix invalid CSS in HTML reporter template.
  Aaron McTavish #981

• Fix crash when correcting statement_position rule when there are multi-byte characters in the file.
  Marcelo Fabri

0.13.2: Light Cycle

Breaking

• None.

Enhancements

• TrailingCommaRule now only triggers when a declaration is multi-line when using mandatory_comma: true.
  Marcelo Fabri #910 #911

Bug Fixes

• Fix MarkRule reporting a violation for // MARK: -, which is valid.
  JP Simard #778

0.13.1: Heavy Cycle

Breaking

• None.

Enhancements

• Add ImplicitGetterRule to warn against using get on computed read-only properties.
  Marcelo Fabri #57

• Add WeakDelegateRule rule to enforce delegate instance variables to be marked as weak.
  Olivier Halligon

• Add SyntacticSugar rule that enforces that shorthanded syntax should be used when possible, for example [Int] instead of Array<Int>.
  Marcelo Fabri #319

• Allow specifying multiple rule identifiers in comment commands. For example, // swiftlint:disable:next force_cast force_try. Works with all command types (disable/enable) and modifiers (next, this, previous or blank).
  JP Simard #861

• Add NimbleOperatorRule opt-in rule that enforces using operator overloads instead of free matcher functions when using Nimble.
  Marcelo Fabri #881

• closure_spacing rule now accepts empty bodies with a space.
  Marcelo Fabri #875

• Add TrailingCommaRule to enforce/forbid trailing commas in arrays and dictionaries. The default is to forbid them, but this can be changed with the mandatory_comma configuration.
  Marcelo Fabri #883

• Add support for fileprivate in PrivateOutletRule and PrivateUnitTestRule.
  Marcelo Fabri #781 #831

• Make MarkRule correctable.
  kohtenko

Bug Fixes

• Rule out a few invalid @IBInspectable cases in valid_ibinspectable.
  Daniel Duan

• Fix a few edge cases where malformed MARK: comments wouldn't trigger a violation.
  JP Simard #805

• Now lints single files passed to --path even if this file is excluded from the configuration file (.swiftlint.yml).
  JP Simard

• Fixed error severity configuration in colon rule.
  Marcelo Fabri #863

• switch_case_on_newline rule should ignore trailing comments.
  Marcelo Fabri #874

• switch_case_on_newline rule shouldn't trigger on enums.
  Marcelo Fabri #878

• Fix regex bug in Comma Rule causing some violations to not be triggered when there were consecutive violations in the same expression.
  Savio Figueiredo #872

0.13.0: MakeYourClothesCleanAgain

Breaking

• None.

Enhancements

• Add ignores_comment configuration for trailing_whitespace rule.
  Javier Hernández #576

• Added HTML reporter, identifier is html.
  Johnykutty Mathew

• Add SuperCallRule opt-in rule that warns about methods not calling to super.
  Angel G. Olloqui #803

• Add RedundantNilCoalesingRule opt-in rule that warns against ?? nil.
  Daniel Beard #764

• Added opt-in rule to makes closure expressions spacing consistent.
  J. Cheyo Jimenez #770

• Adds allow_private_set configuration for the private_outlet rule.
  Rohan Dhaimade

• Swift 2.3 support.
  Norio Nomura, Syo Ikeda

• Color literals count as single characters to avoid unintentional line length violations.
  Jonas #742

• Add SwitchCaseOnNewlineRule opt-in rule that enforces a newline after case pattern: in a switch.
  Marcelo Fabri #681

• Add ValidIBInspectableRule rule that checks if @IBInspectable declarations are valid. An @IBInspectable is valid if:

  • It's declared as a var (not let)
  • Its type is explicit (not inferred)
  • Its type is one of the supported types

  Marcelo Fabri #756

• Add ExplicitInitRule opt-in rule to discourage calling init directly.
  Matt Taube #715

Bug Fixes

• Fixed whitespace being added to TODO messages.
  W. Bagdon #792

• Fixed regex bug in Vertical Whitespace Rule by using SourceKitten instead. The rule now enabled by default again (no longer opt-in).
  J. Cheyo Jimenez #772

• Correctable rules no longer apply corrections if the rule is locally disabled.
  J. Cheyo Jimenez
  #601

• Fixed regex bug in Mark Rule where MARK could not be used with only a hyphen but no descriptive text: // MARK: -.
  Ruotger Deecke #778

• Fixed: Private unit test rule not scoped to test classes.
  Fixed: Private unit test rule config is ignored if regex is missing.
  Cristian Filipov #786

• Fixed: ConditionalReturnsOnNewline now respects severity configuration.
  Rohan Dhaimade #783

• Fixed: ConditionalReturnsOnNewline now checks if return is a keyword, avoiding false positives.
  Marcelo Fabri #784

• ForceUnwrappingRule did not recognize force unwraps in return statements using subscript.
  Norio Nomura #813

0.12.0: Vertical Laundry

Breaking

• Fixed: SwiftLint assumes paths in the YAML config file are relative to the current directory even when --path is passed as an argument.
  Cristian Filipov

Enhancements

• Add --enable-all-rules CLI option to lint command to facilitate running all rules, even opt-in and disabled ones, ignoring whitelist_rules.
  JP Simard #1170

Bug Fixes

• Made Vertical Whitespace Rule added in 0.11.2 opt-in due to performance issues.
  JP Simard #772

0.11.2: Communal Clothesline

This release has seen a phenomenal uptake in community contributions!

Breaking

• None.

Enhancements

• Add MarkRule rule to enforce // MARK syntax.
  Krzysztof Rodak #749

• Add PrivateOutletRule opt-in rule to enforce @IBOutlet instance variables to be private.
  Olivier Halligon

• Add content of the todo statement to message.
  J. Cheyo Jimenez #478

• Add LegacyNSGeometryFunctionsRule rule. Add NSSize, NSPoint, and NSRect constants and constructors to existing rules.
  David Rönnqvist

• Added Vertical Whitespace Rule.
  J. Cheyo Jimenez #548

• Removed ConditionalBindingCascadeRule.
  J. Cheyo Jimenez #701

• Allow setting flexible_right_spacing configuration for the colon rule.
  Shai Mishali #730

• Add Junit reporter.
  Matthew Ellis

• LeadingWhitespaceRule is now auto correctable.
  masters3d

• Add included regex for custom rules to control what files are processed.
  bootstraponline #689

• Add rule to check for private unit tests (private unit tests don't get run by XCTest).
  Cristian Filipov

• Add configuration for setting a warning threshold.
  woodhamgh 696

• Adds 'ConditionalReturnsOnNewLineRule' rule.
  Rohan Dhaimade

• Made - returns: doc optional for initializers.
  Mohpor #557

Bug Fixes

• Fixed CustomRule Regex.
  J. Cheyo Jimenez #717 #726

• Allow disabling custom rules in code.
  J. Cheyo Jimenez #515

• Fix LegacyConstructorRule when using variables instead of numbers.
  Sarr Blaise #646

• Fix force_unwrapping false positive inside strings.
  Daniel Beard #721

0.11.1: Cuddles... Or Else!

Breaking

• None.

Enhancements

• Added statement_mode configuration to the statement_position rule. The
  default mode keeps the current SwiftLint behavior of keeping else and catch statements on the same line as the closing brace before them. The uncuddled_elseconfiguration requires the else and catch to be on a new line with the same leading whitespace as the brace.
  Mike Skiba #651

Bug Fixes

• Remove extraneous argument label added in LegacyCGGeometryFunctionsRule autocorrect.
  Sarr Blaise 643

0.11.0: Laundromat Format

Breaking

• Now type_name allows lowercase enum values to match the Swift API Design Guidelines.
  Jorge Bernal #654

• Embedding frameworks needed by swiftlint was moved from SwiftLintFramework Xcode target to the swiftlint target. The SwiftLintFramework.framework product built by the SwiftLintFramework target no longer contains unnecessary frameworks or multiple copies of the Swift libraries.
  Norio Nomura

Enhancements

• Add --format option to autocorrect command which re-indents Swift files much like pasting into Xcode would. This option isn't currently configurable, but that can change if users request it.
  JP Simard

• Improve error messages for invalid configuration files.
  Brian Hardy

• Added the user-configurable option ignores_empty_lines to the trailing_whitespace rule. It can be used to control whether the TrailingWhitespaceRule should report and correct whitespace-indented empty lines. Defaults to false. Added unit tests.
  Reimar Twelker

Bug Fixes

• Fix false positive in conditional binding cascade violation.
  Norio Nomura #642

• Another conditional binding fix, this time for enum that has two parameters or an if statement with two case tests.
  Andrew Rahn #667

• Fix regression in CommaRule ignoring violations when the comma is followed by a comment.
  Norio Nomura #683

0.10.0: laundry-select edition

Breaking

• None.

Enhancements

• Now libclang.dylib and sourcekitd.framework are dynamically loaded at runtime by SourceKittenFramework to use the versions included in the Xcode version specified by xcode-select -p or custom toolchains.
  Norio Nomura #167

• Add LegacyCGGeometryFunctionsRule rule.
  Sarr Blaise #625

• SwiftLint no longer crashes when SourceKitService crashes.
  Norio Nomura

• Rewrite conditional_binding_cascade rule.
  Norio Nomura #617

• Add autocorrect for ReturnArrowWhitespaceRule.
  Craig Siemens

Bug Fixes

• Failed to launch swiftlint when Xcode.app was placed at non standard path.
  Norio Nomura #593

• ClosingBraceRule no longer triggers across line breaks.
  Josh Friend #592

• LegacyConstantRule and LegacyConstructorRule failed to autocorrect.
  Norio Nomura #623

0.9.2: Multiple Exhaust Codes

Breaking

• None.

Enhancements

• Return different exit codes to distinguish between types of errors:

  • 0: No errors, maybe warnings in non-strict mode
  • 1: Usage or system error
  • 2: Style violations of severity "Error"
  • 3: No style violations of severity "Error", but violations of severity "warning" with --strict
    JP Simard #166

• VariableNameRule now accepts symbols starting with more than one uppercase letter to allow for names like XMLString or MIMEType.
  Erik Aigner #566

Bug Fixes

• Avoid overwriting files whose contents have not changed.
  Neil Gall #574

• Fix CommaRule mismatch between violations and corrections.
  Norio Nomura #466

• Fix more false positives in ForceUnwrappingRule.
  Norio Nomura #546 #547

0.9.1: Air Duct Cleaning

Breaking

• None.

Enhancements

• None.

Bug Fixes

• Fix force unwrap rule missed cases with quotes.
  Norio Nomura #535

• Fix issues with nested .swiftlint.yml file resolution.
  Norio Nomura #543

0.9.0: Appliance Maintenance

Breaking

• Linter.reporter has been removed and Configuration.reporterFromString(_:) has been renamed to a free function: reporterFromString(_:).
  JP Simard

• _ConfigProviderRule & ConfigurableRule have been removed and their requirements have been moved to Rule.
  JP Simard

• Configuration(path:optional:silent) has been changed to Configuration(path:rootPath:optional:quiet:).
  JP Simard

• The static function Configuration.rulesFromDict(_:ruleList:) has been moved to an instance method: RuleList.configuredRulesWithDictionary(_:).
  JP Simard

• The rules parameter in the Configuration initializer has been renamed to configuredRules.
  JP Simard

• Removed a large number of declarations from the public SwiftLintFramework API. This is being done to minimize the API surface area in preparation of a 1.0 release. See #507 for a complete record of this change.
  JP Simard #479

• All instances of the abbreviation "config" in the API have been expanded to "configuration". The --config command line parameter and use_nested_configs configuration key are unaffected.
  JP Simard

• The use_nested_configs configuration key has been deprecated and its value is now ignored. Nested configuration files are now always considered.
  JP Simard

Enhancements

• swiftlint lint now accepts an optional --reporter parameter which overrides existing reporter values in the configuration file. Choose between xcode (default), json, csv or checkstyle.
  JP Simard #440

• swiftlint rules now shows a configuration description for all rules.
  JP Simard

• lint and autocorrect commands now accept a --quiet flag that prevents status messages like 'Linting ' & 'Done linting' from being logged.
  JP Simard #386

• All top-level keys in a configuration file that accept an array now also accept a single value.
  e.g. included: Source is equivalent to included:\n - Source.
  JP Simard #120

• Improve performance of FunctionParameterCountRule.
  Norio Nomura

• Improve performance of ColonRule.
  Norio Nomura

Bug Fixes

• Fix case sensitivity of keywords for valid_docs.
  Ankit Aggarwal #298

• Fixed inconsistencies between violations & corrections in StatementPositionRule.
  JP Simard #466

• A warning will now be logged when invalid top-level keys are included in the configuration file.
  JP Simard #120

• Fixed LegacyConstructorRule from correcting legacy constructors in string literals.
  JP Simard #466

• Fixed an issue where variable_name or type_name would always report a violation when configured with only a warning value on either min_length or max_length.
  JP Simard #522

0.8.0: High Heat

Breaking

• Setting only warning on SeverityLevelsConfig rules now disables the error value.
  Robin Kunde #409

• enabled_rules has been renamed to opt_in_rules.
  Daniel Beard

Enhancements

• Add whitelist_rules rule whitelists in config files.
  Daniel Beard #256

• Improve performance of ColonRule, LineLengthRule & syntaxKindsByLine.
  Norio Nomura

• Add command to display rule description: swiftlint rules <rule identifier>.
  Tony Li #392

• Add FunctionParameterCountRule.
  Denis Lebedev #415

• Measure complexity of nested functions separately in CyclomaticComplexityRule.
  Denis Lebedev #424

• Added exception for multi-line if/guard/while conditions to allow opening brace to be on a new line in OpeningBraceRule.
  Scott Hoyt #355

• The rules command now prints a table containing values for: identifier, opt-in, correctable, enabled in your config & configuration.
  JP Simard #392

• Reduce maximum memory usage.
  Norio Nomura

Bug Fixes

• Fix more false positives in ValidDocsRule.
  diogoguimaraes #451

• Fix trailing_newline autocorrect to handle more than one violation per line.
  Daniel Beard #465

• Fix complexity measurement for switch statements in CyclomaticComplexityRule.
  Denis Lebedev #461

0.7.2: Appliance Manual

Breaking

• None.

Enhancements

• None.

Bug Fixes

• Fix several false positives in ValidDocsRule.
  diogoguimaraes #375

0.7.1: Delicate Cycle

Breaking

• None.

Enhancements

• Improve performance of MissingDocsRule.
  Norio Nomura

• Added CustomRules.
  Scott Hoyt
  #123

• Added opt-in ForceUnwrappingRule to issue warnings for all forced unwrappings.
  Benjamin Otto #55

Bug Fixes

• Fix several false positives in ValidDocsRule.
  diogoguimaraes #375

0.7.0: Automatic Permanent Press

Breaking

• Replaced all uses of XPCDictionary with [String: SourceKitRepresentable].
  JP Simard

• VariableNameMinLengthRule and VariableNameMaxLengthRule have been removed. VariableNameRule now has this functionality.
  Scott Hoyt

• ViolationLevelRule has been removed. This functionality is now provided by ConfigProviderRule and SeverityLevelsConfig.
  Scott Hoyt

Enhancements

• TypeBodyLengthRule now does not count comment or whitespace lines.
  Marcelo Fabri #369

• FunctionBodyLengthRule now does not count comment or whitespace lines.
  Marcelo Fabri #258

• All Rules are now configurable in at least their severity: SeverityConfig.
  Scott Hoyt #371 #130 #268

• TypeNameRule and VariableNameRule conform to ConfigProviderRule using NameConfig to support min_length, max_length, and excluded names.
  Scott Hoyt #388 #259 #191

• Add CyclomaticComplexityRule.
  Denis Lebedev

Bug Fixes

• Fix crash caused by infinite recursion when using nested config files.
  JP Simard #368

• Fix crash when file contains NULL character.
  Norio Nomura #379

0.6.0: Steam Cycle

Breaking

• ParameterizedRule is removed. Use ConfigurableRule instead.
  Scott Hoyt #353

• To activate a Rule, it must be added to the global masterRuleList.
  Scott Hoyt

Enhancements

• ConfigurableRule protocol allows for improved rule configuration. See CONTRIBUTING for more details.
  Scott Hoyt #303

• VariableNameMinLengthRule now supports excluding certain variable names (e.g. "id").
  Scott Hoyt #231

• ViolationLevelRule provides default ConfigurableRule implementation for rules that only need integer error and warning levels.
  Scott Hoyt

• Add AutoCorrect for StatementPositionRule.
  Raphael Randschau

• Add AutoCorrect for CommaRule.
  Raphael Randschau

• Add AutoCorrect for LegacyConstructorRule.
  Raphael Randschau

• Improve performance of LineLengthRule.
  Norio Nomura

• Add ConditionalBindingCascadeRule.
  Aaron McTavish #202

• Opt-in rules are now supported.
  JP Simard #256

• Add LegacyConstantRule.
  Aaron McTavish #319

• Add opt-in rule to encourage checking isEmpty over comparing count to zero.
  JP Simard #202

• Add opt-in "Missing Docs" rule to detect undocumented public declarations.
  JP Simard

Bug Fixes

• None.

0.5.6: Bug FixLint

Breaking

• None.

Enhancements

• Improve performance by reducing calls to SourceKit.
  Norio Nomura

Bug Fixes

• Fix homebrew deployment issues.
  Norio Nomura

• AutoCorrect for TrailingNewlineRule only removes at most one line.
  John Estropia

• valid_docs did not detect tuple as return value.
  Norio Nomura #324

• Escape strings when using CSV reporter.
  JP Simard

0.5.5: Magic Drying Fluff Balls™

http://www.amazon.com/Magic-Drying-Fluff-Balls-Softening/dp/B001EIW1SG

Breaking

• None.

Enhancements

• None.

Bug Fixes

• Always fail if a YAML configuration file was found but could not be parsed.
  JP Simard #310

• Make commands with modifiers work for violations with line-only locations.
  JP Simard #316

0.5.4: Bounce™

Breaking

• Remove Location.init(file:offset:) in favor of the more explicit Location.init(file:byteOffset:) & Location.init(file:characterOffset:).
  JP Simard

Enhancements

• Add checkstyle reporter to generate XML reports in the Checkstyle 4.3 format.
  JP Simard #277

• Support command comment modifiers (previous, this & next) to limit the command's scope to a single line.
  JP Simard #222

• Add nested .swiftlint.yml configuration support.
  Scott Hoyt #299

Bug Fixes

• Fix multibyte handling in many rules.
  JP Simard #279

• Fix an NSRangeException crash.
  Norio Nomura #294

• The valid_docs rule now handles multibyte characters.
  Norio Nomura #295

0.5.3: Mountain Scent

Breaking

• None.

Enhancements

• Improve autocorrect for OpeningBraceRule.
  Yasuhiro Inami

• Add autocorrect for ColonRule.
  Brian Partridge

• Add ClosingBraceRule.
  Yasuhiro Inami

Bug Fixes

• Fix false positives in ValidDocsRule.
  JP Simard #267

0.5.2: Snuggle™

Breaking

• None.

Enhancements

• Performance improvements & unicode fixes (via SourceKitten).
  Norio Nomura

Bug Fixes

• Fix ValidDocsRule false positive when documenting functions with closure parameters.
  diogoguimaraes #267

0.5.1: Lint Tray Malfunction

Breaking

• None.

Enhancements

• None.

Bug Fixes

• Make linting faster than 0.5.0, but slower than 0.4.0
  Norio Nomura #119

• Re-introduce --use-script-input-files option for lint & autocorrect commands. Should also fix some issues when running SwiftLint from an Xcode build phase.
  JP Simard #264

0.5.0: Downy™

Breaking

• init() is no longer a member of the Rule protocol.

Enhancements

• Add legacy constructor rule.
  Marcelo Fabri #202

• The VariableNameRule now allows variable names when the entire name is capitalized. This allows stylistic usage common in cases like URL and other acronyms.
  Marcelo Fabri #161

• Add autocorrect command to automatically correct certain violations (currently only trailing_newline, trailing_semicolon & trailing_whitespace).
  JP Simard #5

• Allow to exclude files from included directory with excluded.
  Michal Laskowski

Bug Fixes

• Statement position rule no longer triggers for non-keyword uses of catch and else.
  JP Simard #237

• Fix issues with multi-byte characters.
  JP Simard #234

0.4.0: Wrinkle Release

Breaking

• API: Rename RuleExample to RuleDescription, remove StyleViolationType and combine Rule().identifier and Rule().example into Rule.description.
  JP Simard #183

Enhancements

• The VariableNameRule now allows capitalized variable names when they are declared static. This allows stylistic usage common in cases like OptionSetType subclasses.
  Will Fleming

• Add VariableNameMaxLengthRule and VariableNameMinLengthRule parameter rules. Remove length checks on VariableNameRule.
  Mickael Morier

• Add trailing semicolon rule.
  JP Simard

• Add force try rule.
  JP Simard

• Support linting from Input Files provided by Run Script Phase of Xcode with --use-script-input-files.
  Norio Nomura #193

Bug Fixes

• All rules now print their identifiers in reports.
  JP Simard #180

• ControlStatementRule now detects all violations.
  Mickael Morier #187

• ControlStatementRule no longer triggers a violation for acceptable use of parentheses.
  Mickael Morier #189

• Nesting rule no longer triggers a violation for enums nested one level deep.
  JP Simard #190

• ColonRule now triggers a violation even if equal operator is collapse to type and value.
  Mickael Morier #135

• Fix an issue where logs would be printed asynchronously over each other.
  JP Simard #200

0.3.0: Wrinkly Rules

Breaking

• swiftlint rules now just prints a list of all available rules and their identifiers.

Enhancements

• Support for Swift 2.1.
  JP Simard

• Added StatementPositionRule to make sure that catch, else if and else statements are on the same line as closing brace preceding them and after one space.
  Alex Culeva

• Added Comma Rule to ensure there is a single space after a comma.
  Alex Culeva

• Add rule identifier to all linter reports.
  zippy1978

• Add OpeningBraceRule to make sure there is exactly a space before opening brace and it is on the same line as declaration.
  Alex Culeva

• Print to stderr for all informational logs. Only reporter outputs is logged to stdout.
  JP Simard

• JSON and CSV reporters now only print at the very end of the linting process.
  JP Simard

• Add support for guard statements to ControlStatementRule.
  David Potter

• Lint parameter variables.
  JP Simard

Bug Fixes

• Custom reporters are now supported even when not running with --use-stdin.
  JP Simard #151

• Deduplicate files in the current directory.
  JP Simard #154

0.2.0: Tumble Dry

Breaking

• SwiftLint now exclusively supports Swift 2.0.
  JP Simard #77

• ViolationSeverity now has an associated type of String and two members: .Warning and .Error.
  JP Simard #113

Enhancements

• Configure SwiftLint via a YAML file: Supports disabled_rules, included, excluded and passing parameters to parameterized rules. Pass a configuration file path to --config, defaults to .swiftlint.yml.
  JP Simard #1 #3 #20 #26

• Updated TypeNameRule and VariableNameRule to allow private type & variable names to start with an underscore.
  JP Simard

• Disable and re-enable rules from within source code comments using // swiftlint:disable $IDENTIFIER and // swiftlint:enable $IDENTIFIER.
  JP Simard #4

• Add --strict lint flag which makes the lint fail if there are any warnings.
  Keith Smiley

• Violations are now printed to stderr.
  Keith Smiley

• Custom reporters are now supported. Specify a value for the reporter: key in your configuration file. Available reporters are xcode (default), json, csv.
  JP Simard #42

Bug Fixes

• Improve performance of TrailingWhitespaceRule.
  Keith Smiley

• Allow newlines in function return arrow.
  JP Simard

0.1.2: FabricSoftenerRule

Breaking

• None.

Enhancements

• Added OperatorFunctionWhitespaceRule to make sure that you use whitespace around operators when defining them.
  Akira Hirakawa #60

• Added ReturnArrowWhitespaceRule to make sure that you have 1 space before return arrow and return type.
  Akira Hirakawa

• Support linting from standard input (use --use-stdin).
  JP Simard #78

• Improve performance of TrailingNewlineRule.
  Keith Smiley

• Lint parentheses around switch statements.
  Keith Smiley

Bug Fixes

• None.

0.1.1: Top Loading

Breaking

• The Rule and ASTRule protocol members are now non-static.
  aarondaub

• Split Rule into Rule and ParameterizedRule protocols.
  aarondaub #21

Enhancements

• Added a command line option --path to specify a path to lint.
  Lars Lockefeer #16

• swiftlint now returns a non-zero error code when a warning of high-severity or above is found in the source files being linted.
  Pat Wallace #30

• Added rules command to display which rules are currently applied along with examples.
  Chris Eidhof

• Cache parsing to reduce execution time by more than 50%.
  Nikolaj Schumacher

• Added ControlStatementRule to make sure that if/for/while/do statements do not wrap their conditionals in parentheses.
  Andrea Mazzini

• Character position is now included in violation location where appropriate.
  JP Simard #62

• The following rules now conform to ASTRule: FunctionBodyLength, Nesting, TypeBodyLength, TypeName, VariableName.
  JP Simard

Bug Fixes

• Trailing newline and file length violations are now displayed in Xcode.
  JP Simard #43

0.1.0: Fresh Out Of The Dryer

First Version!