Simplify the configuration property's implementation across all commands

Author: Matejkob

SwiftSyntaxDevUtils/Sources/swift-syntax-dev-utils/SwiftSyntaxDevUtils.swift

@@ -15,7 +15,7 @@ import ArgumentParser
 @main
 struct SwiftSyntaxDevUtils: ParsableCommand {
 
-  static var configuration: CommandConfiguration = CommandConfiguration(
+  static let configuration = CommandConfiguration(
     abstract: """
       Build and test script for SwiftSyntax.
 

SwiftSyntaxDevUtils/Sources/swift-syntax-dev-utils/commands/Build.swift

@@ -14,11 +14,9 @@ import ArgumentParser
 import Foundation
 
 struct Build: ParsableCommand, BuildCommand {
-  static var configuration: CommandConfiguration {
-    return CommandConfiguration(
-      abstract: "Build swift-syntax."
-    )
-  }
+  static let configuration = CommandConfiguration(
+    abstract: "Build swift-syntax."
+  )
 
   @OptionGroup
   var arguments: BuildArguments

SwiftSyntaxDevUtils/Sources/swift-syntax-dev-utils/commands/Format.swift

@@ -24,17 +24,15 @@ fileprivate let directoriesToExclude = [
 ]
 
 struct Format: ParsableCommand {
-  static var configuration: CommandConfiguration {
-    return CommandConfiguration(
-      abstract: "Format files in SwiftSyntax using swift-format.",
-      discussion: """
-        This command automatically builds the '\(Self.swiftFormatBranch)' branch \
-        of swift-format in the '\(Paths.swiftFormatBuildDir.lastPathComponent)' \
-        directory of this repository and uses the build to format the swift-syntax \
-        sources.
-        """
-    )
-  }
+  static let configuration = CommandConfiguration(
+    abstract: "Format files in SwiftSyntax using swift-format.",
+    discussion: """
+      This command automatically builds the '\(Self.swiftFormatBranch)' branch \
+      of swift-format in the '\(Paths.swiftFormatBuildDir.lastPathComponent)' \
+      directory of this repository and uses the build to format the swift-syntax \
+      sources.
+      """
+  )
 
   @Flag(help: "Update the sources of swift-format and rebuild swift-format")
   var update: Bool = false

SwiftSyntaxDevUtils/Sources/swift-syntax-dev-utils/commands/GenerateSourceCode.swift

@@ -14,11 +14,9 @@ import ArgumentParser
 import Foundation
 
 struct GenerateSourceCode: ParsableCommand, SourceCodeGeneratorCommand {
-  static var configuration: CommandConfiguration {
-    return CommandConfiguration(
-      abstract: "Generate swift-syntax sources."
-    )
-  }
+  static let configuration = CommandConfiguration(
+    abstract: "Generate swift-syntax sources."
+  )
 
   @OptionGroup
   var arguments: SourceCodeGeneratorArguments

SwiftSyntaxDevUtils/Sources/swift-syntax-dev-utils/commands/Test.swift

@@ -14,11 +14,9 @@ import ArgumentParser
 import Foundation
 
 struct Test: ParsableCommand, BuildCommand {
-  static var configuration: CommandConfiguration {
-    return CommandConfiguration(
-      abstract: "Run swift-syntax tests."
-    )
-  }
+  static let configuration = CommandConfiguration(
+    abstract: "Run swift-syntax tests."
+  )
 
   @OptionGroup
   var arguments: BuildArguments

SwiftSyntaxDevUtils/Sources/swift-syntax-dev-utils/commands/VerifySourceCode.swift

@@ -18,11 +18,9 @@ fileprivate var modules: [String] {
 }
 
 struct VerifySourceCode: ParsableCommand, SourceCodeGeneratorCommand {
-  static var configuration: CommandConfiguration {
-    return CommandConfiguration(
-      abstract: "Verify that the generated sources match the ones checked into the repository."
-    )
-  }
+  static let configuration = CommandConfiguration(
+    abstract: "Verify that the generated sources match the ones checked into the repository."
+  )
 
   @OptionGroup
   var arguments: SourceCodeGeneratorArguments