v0.59.1

Compare Source

Breaking

• Remove opaque_over_existential opt-in rule as it causes too many false positives
  that can even lead to wrong-compilable code when any is required by a protocol the
  type conforms to. In this case, using some can be totally valid even though the
  protocol requirement is not reimplemented for the type causing behavioral changes.
  SimplyDanny

Experimental

• None.

Enhancements

• Add new allowed_numbers option to the no_magic_numbers rule.
  Martin Redington

Bug Fixes

• None.

v0.59.0

Compare Source

Breaking

• Remove tracking of correction positions. Print the number of corrections applied instead.
  SimplyDanny

Experimental

• Introduce swiftlint-dev command line tool that's intended to help to develop SwiftLint by encapsulating repetitive
  tasks. It can already be used to generate templates for new rules including optional configurations and tests. Run
  swift run swiftlint-dev rules template -h to get an overview of the command's usage and the available customization
  options. To register new rules, run swift run swiftlint-dev rules register.
  SimplyDanny

Enhancements

• Add new option ignores_multiline_strings to line_length rule. It allows to ignore too long
  lines inside of multiline strings.
  thisIsTheFoxe
  #​2689

• Ignore UIColor initializers in no_magic_numbers rule.
  suojae
  hyeffie
  #​5183

• Exclude types with a @Suite attribute and functions annotated with @Test from no_magic_numbers rule.
  Also treat a type as a @Suite if it contains @Test functions.
  SimplyDanny
  #​5964

• Add new opaque_over_existential opt-in rule that triggers when the existential any type of a
  function parameter can be replaced with an opaque some type.
  SimplyDanny

• Add a new rationale property to rule descriptions, providing a more expansive
  description of the motivation behind each rule.
  Martin Redington
  #​5681

• Add new allowed_types option to legacy_objc_type rule to ignore certain types.
  kapitoshka438
  #​3723

• Add excluded_methods configuration option to unneeded_override to opt out checking methods with a given name.
  For example, this helps avoid a conflict with balanced_xctest_lifecycle where one of setUp/tearDown
  is empty but the other is not.
  jaredgrubb

Bug Fixes

• Fix issue referencing the Tests package from another Bazel workspace.
  jszumski

• Fix crash when a disable command is preceded by a unicode character.
  SimplyDanny
  #​5945

• Allow severity of duplicate_imports rule to be configurable.
  SimplyDanny
  #​5978

• Silence no_magic_numbers rule in conditions of #if directives.
  SimplyDanny
  #​6000

• Consider types restricting a protocol to classes in composed inherited types in class_delegate_protocol rule.
  SimplyDanny
  #​5982

• Rewrite type_contents_order rule with SwiftSyntax fixing an issue with experimental availability macros.
  SimplyDanny
  #​5999

• Update file_name rule to consider macro types.
  fraioli
  #​6026

v0.58.2

Compare Source

Breaking

• None.

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Fix version being reported by the binary consumed from the Docker image.
  SimplyDanny
  #​5966

v0.58.1

Compare Source

Breaking

• If you are referring to the swiftlint binary from an Artifact Bundle consumed via Swift Package Manager
  in an Xcode Run Script Build Phase, make sure to update the path from

  "$SWIFT_PACKAGE_DIR"/swiftlintplugins/SwiftLintBinary/SwiftLintBinary.artifactbundle/swiftlint-*/bin/swiftlint

  to

  "$SWIFT_PACKAGE_DIR"/swiftlintplugins/SwiftLintBinary/SwiftLintBinary.artifactbundle/swiftlint-*-macos/bin/swiftlint

  in order to make Xcode use the binary built for macOS.
  SimplyDanny
  #​5954

• Revert changes to improve performance when exclude patterns resolve to a large set of files. While resolving files
  indeed got much faster in certain setups, it leads to missed exclusions for nested configurations and when the linted
  folder is not the current folder.
  SimplyDanny
  #​5953

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Fix redundant_sendable correction by removing a remaining trailing comma as well when Sendable was last.
  SimplyDanny
  #​5952

• Remove lints for redundant_sendable on protocols, where Sendable is not redundant.
  riley-williams
  #​5958

• Add ib_segue_action to default configuration of type_contents_order rule on the same level as ib_action to
  define and document a standard position.
  SimplyDanny
  #​5524

v0.58.0

Compare Source

Breaking

• The command plugin now requires write permissions so that it works with the --fix option without an error.
  SimplyDanny

• The artifact bundle name has changed. SwiftLintBinary-macos.artifactbundle.zip is now called
  SwiftLintBinary.artifactbundle.zip. It now includes an AMD64 Linux binary.
  Bradley Mackey
  #​5514

• The inert_defer and unused_capture_list rules have completely been removed after being deprecated for 2 years.
  SimplyDanny

• SwiftLint now requires a Swift 5.10 or higher compiler to build.
  The Swift Package Manager plugins continue to work with
  Swift 5.9.
  SimplyDanny

• The private_unit_test rule's deprecated regex configuration option has been removed after 2 years.
  Martin Redington
  #​5912

Experimental

• None.

Enhancements

• Add Xcode command plugin allowing to run SwiftLint from within Xcode.
  SimplyDanny

• Add new async_without_await opt-in rule that checks if an async declaration contains at least one await.
  Jan Kolarik
  #​5082

• Support replacing identity expressions with \.self in prefer_key_path rule from Swift 6 on.
  SimplyDanny

• Support linting only provided file paths with command plugins.
  DanSkeel

• Add new category for @IBSegueAction to type_contents_order rule.
  dk-talks
  SimplyDanny

• Add option to disable redundant_discardable_let rule in SwiftUI view bodies.
  SimplyDanny
  #​3855

• Add new redundant_sendable rule that triggers on Sendable conformances of
  types that are implicitly already Sendable due to being actor-isolated. It
  is enabled by default.
  SimplyDanny

• Improve performance when exclude patterns resolve to a large set of files.
  SimplyDanny
  #​5018

Bug Fixes

• Ignore TipKit's #Rule macro in empty_count rule.
  Ueeek
  #​5883

• Ignore super calls with trailing closures in unneeded_override rule.
  SimplyDanny
  #​5886

• If violations are detected by lint or analyze, still perform an update
  check for new versions of SwiftLint if requested.
  Martin Redington
  #​5904

v0.57.1

Compare Source

Breaking

• None.

Experimental

• None.

Enhancements

• Suggest failable String(bytes:encoding:) initializer in
  optional_data_string_conversion rule as it accepts all Sequence
  types.
  Jordan Rose
  SimplyDanny

• Support reading files to lint from Input File Lists provided
  by Run Script Build Phases in Xcode using the command-line
  argument --use-script-input-file-lists.
  BlueVirusX

• Adds a lenient configuration file setting, equivalent to the --lenient
  command line option.
  Martin Redington
  #​5801

• Support type casting on configuration option values defined by environment variables.
  Without a cast, these values would always be treated as strings leading to a potentially
  invalid configuration.
  SimplyDanny
  #​5774

• Add new option max_number_of_single_line_parameters that allows only the specified maximum
  number of parameters to be on one line when allows_single_line = true. If the limit is
  exceeded, the rule will still trigger. Confusing option combinations like allows_single_line = false
  together with max_number_of_single_line_parameters > 1 will be reported.
  kimdv
  SimplyDanny
  #​5781

• The redundant_type_annotation rule gains a new option,
  ignore_properties, that skips enforcement on members in a
  type declaration (like a struct). This helps the rule coexist with
  the explicit_type_interface rule that requires such redundancy.
  jaredgrubb
  #​3750

• Allow inherited isolation parameter to be first in function signatures
  depending on the new option ignore_first_isolation_inheritance_parameter
  which is true by default.
  SimplyDanny
  #​5793

Bug Fixes

• Run command plugin in whole package if no targets are defined in the
  package manifest.
  SimplyDanny
  #​5787

• Silence superfluous_else rule on if expressions with only a single
  availability condition.
  SimplyDanny
  #​5833

• Stop triggering the control_statement rule on closures being directly
  called as conditions.
  SimplyDanny
  #​5846

• Do not trigger self_in_property_initialization rule on self in
  key paths expressions.
  SimplyDanny
  #​5835

• Allow to specify transitive modules to be taken into account by
  unused_import rule. This avoids that required imports are removed.
  Paul Taykalo
  SimplyDanny
  #​5167

• Only pass cache path and directory paths to commands that accept these arguments
  in the command plugin.
  SimplyDanny
  #​5848

• Do not throw deprecation warning if deprecated property is not
  presented in configuration.
  chipp
  #​5791

• The prefer_type_checking rule will no longer trigger for non-optional
  type casting (as), or for comparisons to optional types.
  Martin Redington
  #​5802

• Fixes an issue where the superfluous_disable_command rule could generate
  false positives for nested disable commands for custom rules.
  Martin Redington
  #​5788

• Fixes the --only-rule command line option, when a default .swiftlint.yml
  is absent. Additionally rules specified with --only-rule on the command
  line can now be disabled in a child configuration, to allow specific
  directories to be excluded from the rule (or from being auto-corrected by
  the rule), and --only-rule can now be specified multiple times
  to run multiple rules.
  Martin Redington
  #​5711

• Fixes file_name rule to match fully-qualified names of nested types.
  Additionally adds a require_fully_qualified_names boolean option to enforce
  that file names match nested types only using their fully-qualified name.
  fraioli
  #​5840

• Fixes an issue where the vertical_whitespace_between_cases rule does not
  recognize @unknown default.
  Jared Grubb
  #​5788

v0.57.0

Compare Source

Breaking

• The deprecated anyobject_protocol rule has now been removed.
  Martin Redington
  #​5769

• Revert the part of the non_optional_string_data_conversion
  rule that enforces non-failable conversions of Data to UTF-8
  String. This is due to the fact that the data to be converted
  can be arbitrary and especially doesn't need to represent a valid
  UTF-8-encoded string.
  Sam Rayner
  #​5263

Experimental

• None.

Enhancements

• Add ignore_multiline_type_headers and ignore_multiline_statement_conditions
  options to opening_brace rule to allow opening braces to be on a new line after
  multiline type headers or statement conditions. Rename allow_multiline_func to
  ignore_multiline_function_signatures.
  leonardosrodrigues0
  #​3720

• Add new optional_data_string_conversion rule to enforce
  failable conversions of Data to UTF-8 String.
  Sam Rayner
  #​5263

• The no_magic_numbers rule will now ignore violations in
  SwiftUI's Preview macro.
  Martin Redington
  #​5778

Bug Fixes

• superfluous_disable_command violations are now triggered for
  custom rules.
  Marcelo Fabri
  Martin Redington
  SimplyDanny
  #​4754

• Trailing comments are now preserved by the opening_brace rule when
  rewriting.
  Martin Redington
  #​5751

v0.56.2

Compare Source

Breaking

• None.

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Ignore initializers with attributes in unneeded_synthesized_initializer rule.
  SimplyDanny
  #​5153

• Silence prefer_key_path rule on macro expansion expressions.
  SimplyDanny
  #​5744

• Check if expressions nested arbitrarily deep in contrasted_opening_brace rule.
  SimplyDanny
  #​5752

• Align left closure brace with associated parent function call in contrasted_opening_brace rule.
  SimplyDanny
  #​5752

• Align left brace of additional trailing closures with right brace of previous trailing closure
  in contrasted_opening_brace rule.
  SimplyDanny
  #​5752

• Trigger on empty closure blocks in no_empty_block rule.
  SimplyDanny
  #​5762

• Silence unneeded_override rule on methods and initializers with attributes.
  SimplyDanny
  #​5753

v0.56.1

Compare Source

Breaking

• None.

Experimental

• None.

Enhancements

• None.

Bug Fixes

• Let contrasted_opening_brace be an opt-in rule.
  SimplyDanny

v0.56.0

Compare Source

Breaking

• The deprecated --path and --in-process-sourcekit arguments have now been
  removed completely.
  Martin Redington
  SimplyDanny
  #​5614

• When SwiftLint corrects violations automatically (swiftlint lint --fix)
  it doesn't report the exact location of the fix any longer. The new format
  is <file-path>: Correcting <rule-name> without line and column numbers.
  Reason: Correction positions are likely just incorrect, especially when
  multiple rules apply their rewrites. Fixing that is not trivial and likely
  not worth the effort also considering that there haven't been any bug
  reports about wrong correction positions so far.
  SimplyDanny

Experimental

• None.

Enhancements

• Add new attribute_name_spacing rule to enforce no trailing whitespace between
  attribute names and parentheses, ensuring compatibility with Swift 6, where this spacing
  causes compilation errors.
  aryamansharda
  #​5667

• Linting got up to 30% faster due to the praisworthy performance
  improvements done in the SwiftSyntax
  library.

• Rewrite the following rules with SwiftSyntax:

  • missing_docs

  woxtu
  SimplyDanny

• Add new prefer_key_path rule that triggers when a trailing closure on a standard
  function call is only hosting a (chained) member access expression since the closure
  can be replaced with a key path argument. Likewise, it triggers on closure arguments.
  SimplyDanny

• Adds baseline and write_baseline configuration file settings, equivalent
  to the --baseline and --write-baseline command line options.
  Martin Redington
  #​5552

• Add no_empty_block opt-in rule to validate that code blocks are not empty.
  They should at least contain a comment.
  Ueeek
  #​5615

• Add new contrasted_opening_brace rule that enforces opening
  braces to be on a separate line after the preceding declaration.
  SimplyDanny

• Add new unused_parameter rule that triggers on function/initializer/subscript
  parameters that are not used inside of the function/initializer/subscript.
  SimplyDanny
  #​2120

• Support --target paths being passed to command plugin by Xcode.
  SimplyDanny
  #​5603

• Add modified configurations to examples in rule documentation.
  SimplyDanny

• Add new option evaluate_effective_access_control_level to missing_docs
  rule. Setting it to true stops the rule from triggering on declarations
  inside of types with lower visibility. These declarations effectively
  have at most the same access level.
  SimplyDanny

• Add new --check-for-updates command line option for the lint, analyze,
  and version subcommands to check for new versions of SwiftLint, and an
  equivalent check_for_updates configuration file setting.
  Martin Redington
  SimplyDanny
  Ian Leitch
  #​5613

• Add new --only-rule command line option for the lint and analyze,
  subcommands that overrides configuration file rule enablement and
  disablement, in particular to facilitate running --fix for single rules
  without having to temporarily edit the configuration file.
  Martin Redington
  #​5666

Bug Fixes

• Fix a few false positives and negatives by updating the parser to support
  Swift 6 with all its new language constructs.
  SimplyDanny

• Stop triggering mark rule on "mark" comments in the middle of another
  comment.
  SimplyDanny
  #​5592

• Don't consider specialized imports with attributes as duplicates in
  duplicate_imports rule.
  SimplyDanny
  #​5716

• Use correct types and relative paths in SARIF reporter output. Generally
  avoid escaping slashes in JSON output as well.
  SimplyDanny
  #​5598
  #​5599

• Keep initializers with attributed parameters in
  unneeded_synthesized_initializer rule.
  SimplyDanny
  #​5153

• Make vertical_whitespace_between_cases rule work for
  cases ending with a string literal.
  ilendemli
  #​5612

• Ignore access level modifiers restricted to value setting in
  extension_access_modifier rule.
  SimplyDanny
  #​5623

• Fix baseline compare incorrectly reporting some violations
  as new, and also now sorts the violations from baseline compare
  deterministically.
  Martin Redington
  #​5606

• Fix rewriting for implicit_return rule when violations are
  nested within each other.
  Martin Redington
  #​5660

• Fix opening_brace correction and make sure that disable commands
  are taken into account before applying a fix.
  swiftty
  SimplyDanny
  #​5598

• Violations of the typesafe_array_init rule will now be correctly
  reported as such, instead of as violations of the array_init
  rule.
  Martin Redington
  #​5709

v0.55.1

Compare Source

Breaking

• None.

Experimental

• None.

Enhancements

• Clarify wording of static_over_final_class rule's violation message.
  SimplyDanny
  #​5570

Bug Fixes

• Fix Bazel build when bzlmod is not in use by adding transitive dependencies
  explicitly.
  SimplyDanny
  #​5568

• Treat condionally activatable variable declarations and initializer as if
  they were always active in unneeded_synthesized_initializer rule to avoid
  compilation issues when unexpected items are there after all.
  SimplyDanny
  #​5574

• Silence unused_enumerated rule when $0 in a closure is explicitly unpacked.
  SimplyDanny
  #​5573

• Remove redundant initializers in unneeded_override rule only when checking
  initializers is actually enabled in the configuration.
  SimplyDanny
  #​5571

• Respect comments before opening brace in opening_brace rule when there is
  one space before the brace after the comment. Everything else is still a
  violation, yet the rewriter will not remove the comment anymore.
  SimplyDanny
  #​5578

v0.55.0

Compare Source

Breaking

• Rewrite SwiftLintBuildToolPlugin using BUILD_WORKSPACE_DIRECTORY without relying
  on the --config option.
  Garric Nahapetian

• Introduce SwiftLintCommandPlugin.
  Rename SwiftLintBuildToolPlugin.
  Add Swift Package Manager installation instructions.
  garricn

• Fix Code Climate reporter output by having lower case severity
  values to comply with the Code Climate specification.
  waitButY

• The superfluous_disable_command rule will now be enabled for the analyze
  command, unless it has been disabled, and will warn about superfluous
  disablement of analyzer rules.
  Martin Redington
  #​4792

• With the introduction of the consider_default_literal_types_redundant
  option to the redundant_type_annotation rule, Bool literals will no
  longer be considered redundant by default. Set this option to true to
  preserve the previous behavior.
  Garric Nahapetian

Experimental

• Add two new options to the lint and analyze commands: --write-baseline
  to save a baseline to disk, and --baseline to read a saved baseline and
  use it to filter out detected pre-existing violations. A new baseline
  command uses the reporters to print the violations in a baseline.
  Martin Redington
  #​5475
  #​3421

Enhancements

• Add a reporter that outputs violations in the Static
  Analysis Results Interchange Format (SARIF).
  waitButY

• Ignore absence of a non-initial local config instead of
  falling back to default.
  kohtenko

• Add new option ignore_typealiases_and_associatedtypes to
  nesting rule. It excludes typealias and associatedtype
  declarations from the analysis.
  marunomi
  #​3183

• Prevent from compiling SwiftLint target when only using SwiftLintPlugin on macOS.
  Julien Baillon
  #​5372

• Allow to set the severity of rules (if they have one) in the short form
  rule_name: warning|error provided that no other attributes need to be
  configured.
  SimplyDanny

• Add new ignore_one_liners option to switch_case_alignment
  rule to ignore switch statements written in a single line.
  tonell-m
  #​5373

• Add new shorthand_argument rule that triggers on shorthand arguments
  like $0, $1, etc. in closures if they are too far away from the
  beginning of the closure. Options allow further cases to always trigger.
  SimplyDanny
  #​70

• Warn when --fix comes together with --strict or --lenient as only --fix
  takes effect then.
  SimplyDanny
  #​5387

• Add new one_declaration_per_file rule that allows only a
  single class/struct/enum/protocol declaration per file.
  Extensions are an exception; more than one is allowed.
  Muhammad Zeeshan
  #​2802

• Add new ignore_attributes option to redundant_type_annotation rule
  that allows disabling the rule for properties that are marked with at least
  one of the configured attributes.
  tonell-m
  #​5366

• Rewrite the following rules with SwiftSyntax:

  • explicit_acl
  • extension_access_modifier
  • identifier_name
  • let_var_whitespace
  • mark
  • multiline_literal_brackets
  • nesting
  • nimble_operator
  • opening_brace
  • orphaned_doc_comment
  • redundant_type_annotation
  • trailing_closure
  • void_return

  SimplyDanny
  kishikawakatsumi
  Marcelo Fabri
  swiftty
  KS1019
  tonell-m

• Print invalid keys when configuration parsing fails.
  SimplyDanny
  #​5347

• Add new final_test_case rule that triggers on non-final test classes.
  SimplyDanny

• Make superfluous_else rule auto-correctable.
  SimplyDanny

• Support other scope-exiting statements continue, break and throw in
  superfluous_else rule.
  SimplyDanny

• Trigger on -> () return signatures in return_value_from_void_function
  rule. Moreover, support automatic fixes for obvious cases.
  SimplyDanny

• Refine violation position of trailing_closure rule.
  SimplyDanny

• Trigger on the declaration keyword (i.e. let, var, func, subscript)
  instead of the static or class keywords in the explicit_acl rule.
  SimplyDanny

• Allow to configure more operators in identifier_name rule. The new option
  is named additional_operators. Use it to add more operators to the list
  of default operators known to the rule.
  SimplyDanny
  #​1762

• Stop triggering no_magic_numbers rule on literals used in range
  expressions assigned to variables.
  SimplyDanny
  #​5430

• Add affect_initializers option to allow unneeded_override rule
  to affect initializers.
  leonardosrodrigues0
  #​5265

• Respect scattered disable commands in auto-correction of duplicate_imports
  rule.
  SimplyDanny
  #​5418

• Add new non_optional_string_data_conversion rule to enforce
  non-failable conversions of UTF-8 String <-> Data.
  Ben P
  #​5263

• Refine violation position of superfluous_else rule.
  SimplyDanny

• Make sorted_enum_cases rule's comparison case-insensitive to
  avoid unexpected ordering.
  Oleg Kokhtenko

• Add excluded_lines_patterns to line_length to avoid linting lines
  that contain one of the patterns.
  kasrababaei

• Make empty_count auto-correctable.
  KS1019

• Make private_swiftui_state auto-correctable.
  mt00chikin

• Make trailing_closure correctable.
  KS1019

• Add new static_over_final_class rule to prefer static over
  final class declaration.
  phlippieb
  #​5471

• Extends unused_enumerated rule to cover closure parameters, to
  detect cases like list.enumerated().map { idx, _ in idx } and
  list.enumerated().map { $1 }.
  Martin Redington
  #​5470

• Include Double, Int and String to the exiting redundant type validation
  check of Bool in the redundant_type_annotation rule. Add
  consider_default_literal_types_redundant option supporting Bool,
  Double, Int and String. Setting this option to true lets the rule
  consider said types in declarations like let i: Int = 1 or
  let s: String = "" as redundant.
  Garric Nahapetian

• Add new prefer_type_checking rule to prefer a is X over a as? X != nil.
  ikelax
  mildm8nnered
  #​5295

Bug Fixes

• Invalid keys in a configuration don't lead to the default configuration being
  used anymore. The invalid key will just be reported but otherwise ignored.
  SimplyDanny
  #​5565

• Fix version comparison algorithm which caused some version-dependent rules to
  misbehave with Swift 5.10.
  chandlerwall
  #​5517

• Silence discarded_notification_center_observer rule in closures. Furthermore,
  handle get and set accessors correctly and consider implicit returns.
  SimplyDanny
  #​4801

• Fix some false positives in let_var_whitespace rule that would happen
  when attributes attached to declarations were spread over multiple lines.
  SimplyDanny
  #​4801

• Support private_over_fileprivate rule for actors.
  SimplyDanny
  #​5489

• Ensure that declarations referenced only as extended types do not count as
  used by means of the unused_declaration rule.
  SimplyDanny
  #​5550

• Fix some false positives in multiline_literal_brackets rule that would
  happen when comments are present.
  Marcelo Fabri

• Fix some false positives in the opening_brace rule.
  kishikawakatsumi
  SimplyDanny
  #​4610
  #​5114
  #​3470
  #​3574
  #​2632
  #​3476
  #​3756
  #​3690

• Ignore overridden functions with default parameters in the unneeded_override
  rule as they might change behavior.
  SimplyDanny
  #​5355

• Trigger nsobject_prefer_isequal and redundant_self_in_closure even in case
  the surrounding declaration is nested in an extension.
  SimplyDanny

• Fixed false positives for the no_magic_numbers rule, when they
  are defined in a tuple like let (a, b) = (5, 10) or let a = (2, 3).
  Martin Redington
  #​5305

• Take array and nested types into account in redundant_type_annotation rule.
  SimplyDanny
  #​3141
  #​3146

• Silence pattern_matching_keywords rule when an identifier is referenced
  in the argument list of a matching enum case.
  SimplyDanny
  #​3852

• Don't trigger the return_value_from_void_function warning from initializers.
  mrbkap

• Fixes superfluous warnings about configurations for rules that were not
  enabled, when the rules were enabled in a parent configuration.
  Martin Redington
  #​4858

• Add all pseudo-rule for analyzer_rules - enables all analyzer rules
  that are not listed in disabled_rules.
  woxtu
  Martin Redington
  #​4999

• Updates the reasons provided by violations of the blanket_disable_command
  to omit language about the end of the file, and to direct users to
  re-enable the rule as soon as possible.
  Martin Redington
  #​5450

• Add a --working-directory command line option, for users who cannot
  otherwise control which directory SwiftLint is run from.
  Martin Redington
  #​5424