Reformat swift-format and enforce it on PRs.

.github/workflows/pull_request.yml

@@ -12,6 +12,5 @@ jobs:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
     with:
-      format_check_enabled: false
       license_header_check_enabled: false
       license_header_check_project_name: "Swift.org"

.swift-format

@@ -0,0 +1,18 @@
+{
+    "version": 1,
+    "lineLength": 120,
+    "indentation": {
+        "spaces": 2
+    },
+    "lineBreakBeforeEachArgument": true,
+    "indentConditionalCompilationBlocks": false,
+    "prioritizeKeepingFunctionOutputTogether": true,
+    "rules": {
+        "AlwaysUseLowerCamelCase": false,
+        "AmbiguousTrailingClosureOverload": false,
+        "NoBlockComments": false,
+        "OrderedImports": true,
+        "UseLetInEveryBoundCaseVariable": false,
+        "UseSynthesizedInitializer": false
+    }
+}

Package.swift

@@ -18,7 +18,7 @@ let package = Package(
   name: "swift-format",
   platforms: [
     .macOS("12.0"),
-    .iOS("13.0")
+    .iOS("13.0"),
   ],
   products: [
     .executable(
@@ -131,7 +131,7 @@ let package = Package(
         .product(name: "SwiftSyntax", package: "swift-syntax"),
         .product(name: "SwiftSyntaxBuilder", package: "swift-syntax"),
       ]
-    )
+    ),
   ]
 )
 
@@ -167,15 +167,12 @@ var dependencies: [Package.Dependency] {
   }
 }
 
-
-
 // MARK: - Compute custom build settings
 
-var swiftformatLinkSettings: [LinkerSetting]  {
+var swiftformatLinkSettings: [LinkerSetting] {
   if installAction {
     return [.unsafeFlags(["-no-toolchain-stdlib-rpath"], .when(platforms: [.linux, .android]))]
   } else {
     return []
   }
 }
-

Plugins/FormatPlugin/plugin.swift

@@ -1,28 +1,27 @@
-import PackagePlugin
 import Foundation
+import PackagePlugin
 
 @main
 struct FormatPlugin {
   func format(tool: PluginContext.Tool, targetDirectories: [String], configurationFilePath: String?) throws {
     let swiftFormatExec = URL(fileURLWithPath: tool.path.string)
-    
+
     var arguments: [String] = ["format"]
-    
+
     arguments.append(contentsOf: targetDirectories)
-    
+
     arguments.append(contentsOf: ["--recursive", "--parallel", "--in-place"])
-    
+
     if let configurationFilePath = configurationFilePath {
       arguments.append(contentsOf: ["--configuration", configurationFilePath])
     }
-    
+
     let process = try Process.run(swiftFormatExec, arguments: arguments)
     process.waitUntilExit()
-    
+
     if process.terminationReason == .exit && process.terminationStatus == 0 {
       print("Formatted the source code.")
-    }
-    else {
+    } else {
       let problem = "\(process.terminationReason):\(process.terminationStatus)"
       Diagnostics.error("swift-format invocation failed: \(problem)")
     }
@@ -35,15 +34,16 @@ extension FormatPlugin: CommandPlugin {
     arguments: [String]
   ) async throws {
     let swiftFormatTool = try context.tool(named: "swift-format")
-    
+
     var argExtractor = ArgumentExtractor(arguments)
     let targetNames = argExtractor.extractOption(named: "target")
-    let targetsToFormat = targetNames.isEmpty ? context.package.targets : try context.package.targets(named: targetNames)
-
+    let targetsToFormat =
+      targetNames.isEmpty ? context.package.targets : try context.package.targets(named: targetNames)
+
     let configurationFilePath = argExtractor.extractOption(named: "swift-format-configuration").first
-    
-    let sourceCodeTargets = targetsToFormat.compactMap{ $0 as? SourceModuleTarget }
-    
+
+    let sourceCodeTargets = targetsToFormat.compactMap { $0 as? SourceModuleTarget }
+
     try format(
       tool: swiftFormatTool,
       targetDirectories: sourceCodeTargets.map(\.directory.string),
@@ -58,10 +58,10 @@ import XcodeProjectPlugin
 extension FormatPlugin: XcodeCommandPlugin {
   func performCommand(context: XcodeProjectPlugin.XcodePluginContext, arguments: [String]) throws {
     let swiftFormatTool = try context.tool(named: "swift-format")
-    
+
     var argExtractor = ArgumentExtractor(arguments)
     let configurationFilePath = argExtractor.extractOption(named: "swift-format-configuration").first
-    
+
     try format(
       tool: swiftFormatTool,
       targetDirectories: [context.xcodeProject.directory.string],

Plugins/LintPlugin/plugin.swift

@@ -1,28 +1,27 @@
-import PackagePlugin
 import Foundation
+import PackagePlugin
 
 @main
 struct LintPlugin {
   func lint(tool: PluginContext.Tool, targetDirectories: [String], configurationFilePath: String?) throws {
     let swiftFormatExec = URL(fileURLWithPath: tool.path.string)
-    
+
     var arguments: [String] = ["lint"]
-    
+
     arguments.append(contentsOf: targetDirectories)
-    
+
     arguments.append(contentsOf: ["--recursive", "--parallel", "--strict"])
-    
+
     if let configurationFilePath = configurationFilePath {
       arguments.append(contentsOf: ["--configuration", configurationFilePath])
     }
-    
+
     let process = try Process.run(swiftFormatExec, arguments: arguments)
     process.waitUntilExit()
-    
+
     if process.terminationReason == .exit && process.terminationStatus == 0 {
       print("Linted the source code.")
-    }
-    else {
+    } else {
       let problem = "\(process.terminationReason):\(process.terminationStatus)"
       Diagnostics.error("swift-format invocation failed: \(problem)")
     }
@@ -35,16 +34,17 @@ extension LintPlugin: CommandPlugin {
     arguments: [String]
   ) async throws {
     let swiftFormatTool = try context.tool(named: "swift-format")
-    
+
     // Extract the arguments that specify what targets to format.
     var argExtractor = ArgumentExtractor(arguments)
     let targetNames = argExtractor.extractOption(named: "target")
-
-    let targetsToFormat = targetNames.isEmpty ? context.package.targets : try context.package.targets(named: targetNames)
+
+    let targetsToFormat =
+      targetNames.isEmpty ? context.package.targets : try context.package.targets(named: targetNames)
     let configurationFilePath = argExtractor.extractOption(named: "swift-format-configuration").first
-    
+
     let sourceCodeTargets = targetsToFormat.compactMap { $0 as? SourceModuleTarget }
-    
+
     try lint(
       tool: swiftFormatTool,
       targetDirectories: sourceCodeTargets.map(\.directory.string),
@@ -61,7 +61,7 @@ extension LintPlugin: XcodeCommandPlugin {
     let swiftFormatTool = try context.tool(named: "swift-format")
     var argExtractor = ArgumentExtractor(arguments)
     let configurationFilePath = argExtractor.extractOption(named: "swift-format-configuration").first
-    
+
     try lint(
       tool: swiftFormatTool,
       targetDirectories: [context.xcodeProject.directory.string],

Sources/SwiftFormat/API/Configuration.swift

@@ -278,9 +278,11 @@ public struct Configuration: Codable, Equatable {
     self.version = try container.decodeIfPresent(Int.self, forKey: .version) ?? 1
     guard version <= highestSupportedConfigurationVersion else {
       throw DecodingError.dataCorruptedError(
-        forKey: .version, in: container,
+        forKey: .version,
+        in: container,
         debugDescription:
-          "This version of the formatter does not support configuration version \(version).")
+          "This version of the formatter does not support configuration version \(version)."
+      )
     }
 
     // If we ever introduce a new version, this is where we should switch on the decoded version
@@ -328,30 +330,40 @@ public struct Configuration: Codable, Equatable {
       ?? defaults.prioritizeKeepingFunctionOutputTogether
     self.indentConditionalCompilationBlocks =
       try container.decodeIfPresent(Bool.self, forKey: .indentConditionalCompilationBlocks)
-    ?? defaults.indentConditionalCompilationBlocks
+      ?? defaults.indentConditionalCompilationBlocks
     self.lineBreakAroundMultilineExpressionChainComponents =
       try container.decodeIfPresent(
-        Bool.self, forKey: .lineBreakAroundMultilineExpressionChainComponents)
+        Bool.self,
+        forKey: .lineBreakAroundMultilineExpressionChainComponents
+      )
       ?? defaults.lineBreakAroundMultilineExpressionChainComponents
     self.spacesAroundRangeFormationOperators =
       try container.decodeIfPresent(
-        Bool.self, forKey: .spacesAroundRangeFormationOperators)
+        Bool.self,
+        forKey: .spacesAroundRangeFormationOperators
+      )
       ?? defaults.spacesAroundRangeFormationOperators
     self.fileScopedDeclarationPrivacy =
       try container.decodeIfPresent(
-        FileScopedDeclarationPrivacyConfiguration.self, forKey: .fileScopedDeclarationPrivacy)
+        FileScopedDeclarationPrivacyConfiguration.self,
+        forKey: .fileScopedDeclarationPrivacy
+      )
       ?? defaults.fileScopedDeclarationPrivacy
     self.indentSwitchCaseLabels =
       try container.decodeIfPresent(Bool.self, forKey: .indentSwitchCaseLabels)
-    ?? defaults.indentSwitchCaseLabels
+      ?? defaults.indentSwitchCaseLabels
     self.noAssignmentInExpressions =
       try container.decodeIfPresent(
-        NoAssignmentInExpressionsConfiguration.self, forKey: .noAssignmentInExpressions)
+        NoAssignmentInExpressionsConfiguration.self,
+        forKey: .noAssignmentInExpressions
+      )
       ?? defaults.noAssignmentInExpressions
     self.multiElementCollectionTrailingCommas =
       try container.decodeIfPresent(
-        Bool.self, forKey: .multiElementCollectionTrailingCommas)
-    ?? defaults.multiElementCollectionTrailingCommas
+        Bool.self,
+        forKey: .multiElementCollectionTrailingCommas
+      )
+      ?? defaults.multiElementCollectionTrailingCommas
 
     self.reflowMultilineStringLiterals =
       try container.decodeIfPresent(MultilineStringReflowBehavior.self, forKey: .reflowMultilineStringLiterals)
@@ -384,9 +396,12 @@ public struct Configuration: Codable, Equatable {
     try container.encode(lineBreakBetweenDeclarationAttributes, forKey: .lineBreakBetweenDeclarationAttributes)
     try container.encode(
       lineBreakAroundMultilineExpressionChainComponents,
-      forKey: .lineBreakAroundMultilineExpressionChainComponents)
+      forKey: .lineBreakAroundMultilineExpressionChainComponents
+    )
     try container.encode(
-      spacesAroundRangeFormationOperators, forKey: .spacesAroundRangeFormationOperators)
+      spacesAroundRangeFormationOperators,
+      forKey: .spacesAroundRangeFormationOperators
+    )
     try container.encode(fileScopedDeclarationPrivacy, forKey: .fileScopedDeclarationPrivacy)
     try container.encode(indentSwitchCaseLabels, forKey: .indentSwitchCaseLabels)
     try container.encode(noAssignmentInExpressions, forKey: .noAssignmentInExpressions)

Sources/SwiftFormat/API/Indent.swift

@@ -36,7 +36,9 @@ public enum Indent: Hashable, Codable {
       throw DecodingError.dataCorrupted(
         DecodingError.Context(
           codingPath: decoder.codingPath,
-          debugDescription: "Only one of \"tabs\" or \"spaces\" may be specified"))
+          debugDescription: "Only one of \"tabs\" or \"spaces\" may be specified"
+        )
+      )
     }
     if let spacesCount = spacesCount {
       self = .spaces(spacesCount)
@@ -50,7 +52,9 @@ public enum Indent: Hashable, Codable {
     throw DecodingError.dataCorrupted(
       DecodingError.Context(
         codingPath: decoder.codingPath,
-        debugDescription: "One of \"tabs\" or \"spaces\" must be specified"))
+        debugDescription: "One of \"tabs\" or \"spaces\" must be specified"
+      )
+    )
   }
 
   public func encode(to encoder: Encoder) throws {

Sources/SwiftFormat/API/Selection.swift

@@ -24,7 +24,7 @@ public enum Selection {
       self = .infinite
     } else {
       let ranges = offsetRanges.map {
-        AbsolutePosition(utf8Offset: $0.lowerBound) ..< AbsolutePosition(utf8Offset: $0.upperBound)
+        AbsolutePosition(utf8Offset: $0.lowerBound)..<AbsolutePosition(utf8Offset: $0.upperBound)
       }
       self = .ranges(ranges)
     }
@@ -49,7 +49,6 @@ public enum Selection {
   }
 }
 
-
 public extension Syntax {
   /// - Returns: `true` if the node is _completely_ inside any range in the selection
   func isInsideSelection(_ selection: Selection) -> Bool {

Sources/SwiftFormat/API/SwiftFormatter.swift

@@ -72,7 +72,8 @@ public final class SwiftFormatter {
       assumingFileURL: url,
       selection: .infinite,
       to: &outputStream,
-      parsingDiagnosticHandler: parsingDiagnosticHandler)
+      parsingDiagnosticHandler: parsingDiagnosticHandler
+    )
   }
 
   /// Formats the given Swift source code and writes the result to an output stream.
@@ -109,10 +110,16 @@ public final class SwiftFormatter {
       source: source,
       operatorTable: .standardOperators,
       assumingFileURL: url,
-      parsingDiagnosticHandler: parsingDiagnosticHandler)
+      parsingDiagnosticHandler: parsingDiagnosticHandler
+    )
     try format(
-      syntax: sourceFile, source: source, operatorTable: .standardOperators, assumingFileURL: url,
-      selection: selection, to: &outputStream)
+      syntax: sourceFile,
+      source: source,
+      operatorTable: .standardOperators,
+      assumingFileURL: url,
+      selection: selection,
+      to: &outputStream
+    )
   }
 
   /// Formats the given Swift syntax tree and writes the result to an output stream.
@@ -137,14 +144,24 @@ public final class SwiftFormatter {
   ///     be written.
   /// - Throws: If an unrecoverable error occurs when formatting the code.
   public func format<Output: TextOutputStream>(
-    syntax: SourceFileSyntax, source: String, operatorTable: OperatorTable,
-    assumingFileURL url: URL?, selection: Selection, to outputStream: inout Output
+    syntax: SourceFileSyntax,
+    source: String,
+    operatorTable: OperatorTable,
+    assumingFileURL url: URL?,
+    selection: Selection,
+    to outputStream: inout Output
   ) throws {
     let assumedURL = url ?? URL(fileURLWithPath: "source")
     let context = Context(
-      configuration: configuration, operatorTable: operatorTable, findingConsumer: findingConsumer,
-      fileURL: assumedURL, selection: selection, sourceFileSyntax: syntax, source: source,
-      ruleNameCache: ruleNameCache)
+      configuration: configuration,
+      operatorTable: operatorTable,
+      findingConsumer: findingConsumer,
+      fileURL: assumedURL,
+      selection: selection,
+      sourceFileSyntax: syntax,
+      source: source,
+      ruleNameCache: ruleNameCache
+    )
     let pipeline = FormatPipeline(context: context)
     let transformedSyntax = pipeline.rewrite(Syntax(syntax))
 
@@ -158,7 +175,8 @@ public final class SwiftFormatter {
       source: source,
       node: transformedSyntax,
       printTokenStream: debugOptions.contains(.dumpTokenStream),
-      whitespaceOnly: false)
+      whitespaceOnly: false
+    )
     outputStream.write(printer.prettyPrint())
   }
 }