🐦 Introduce Swift and Add Swift OneofHelper Code Generation Support

cmd/protoc-gen-swift-oneof-helper/main.go

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+// cmd/protoc-gen-swift-oneof-helper/main.go
+package main
+
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+func main() {
+	// Get the directory of this executable
+	execPath, err := os.Executable()
+	if err != nil {
+		panic(err)
+	}
+
+	// Look for the Swift binary
+	swiftBinary := filepath.Join(filepath.Dir(execPath), "protoc-gen-swift-oneof-helper-swift")
+
+	// If Swift binary doesn't exist, try building it
+	if _, err := os.Stat(swiftBinary); os.IsNotExist(err) {
+		buildSwiftBinary(swiftBinary)
+	}
+
+	// Execute the Swift binary
+	cmd := exec.Command(swiftBinary)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	if err := cmd.Run(); err != nil {
+		os.Exit(1)
+	}
+}
+
+func buildSwiftBinary(outputPath string) {
+	cmd := exec.Command("swift", "build", "-c", "release", "--product", "protoc-gen-swift-oneof-helper")
+	if err := cmd.Run(); err != nil {
+		panic("Failed to build Swift binary: " + err.Error())
+	}
+
+	// Copy the built binary to the expected location
+	builtBinary := ".build/release/protoc-gen-swift-oneof-helper"
+	cmd = exec.Command("cp", builtBinary, outputPath)
+	cmd.Run()
+}

swift/.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

swift/.swiftpm/xcode/xcshareddata/xcschemes/SwiftSebuf.xcscheme

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+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1640"
+   version = "1.7">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES"
+      buildArchitectures = "Automatic">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "SwiftSebuf"
+               BuildableName = "SwiftSebuf"
+               BlueprintName = "SwiftSebuf"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      shouldAutocreateTestPlan = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "SwiftSebufTests"
+               BuildableName = "SwiftSebufTests"
+               BlueprintName = "SwiftSebufTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "SwiftSebuf"
+            BuildableName = "SwiftSebuf"
+            BlueprintName = "SwiftSebuf"
+            ReferencedContainer = "container:">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

swift/.swiftpm/xcode/xcshareddata/xcschemes/SwiftSebufTests.xcscheme

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1640"
+   version = "1.7">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES"
+      buildArchitectures = "Automatic">
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      shouldAutocreateTestPlan = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "SwiftSebufTests"
+               BuildableName = "SwiftSebufTests"
+               BlueprintName = "SwiftSebufTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

swift/Package.swift

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+// swift-tools-version: 6.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+@preconcurrency import PackageDescription
+
+let package = Package(
+	name: .name,
+	platforms: [.macOS(.v14)],
+    products: [
+        // Products define the executables and libraries a package produces, making them visible to other packages.
+        .swiftSebuf
+    ],
+	dependencies: [
+		.swiftArgumentParser,
+		.swiftProtobuf
+	],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .swiftSebuf,
+		.swiftSebufTest
+    ]
+)
+
+private extension String {
+
+	// MARK: Package Name
+	static let name: Self = "SwiftSebuf"
+
+	// MARK: Modules
+	static let swiftSebuf: Self = "SwiftSebuf"
+
+	// MARK: Packages
+	static let swiftArgumentParser: Self = "ArgumentParser"
+	static let swiftArgumentParserPackage: Self = "swift-argument-parser"
+	static let swiftProtobuf: Self = "SwiftProtobuf"
+	static let swiftProtobufPluginLibrary: Self = "SwiftProtobufPluginLibrary"
+	static let swiftProtobufPackage: Self = "swift-protobuf"
+
+	var test: Self {
+		"\(self)Tests"
+	}
+}
+
+private extension Product {
+
+	static let swiftSebuf: Product = library(name: .swiftSebuf, targets: [.swiftSebuf])
+}
+
+private extension Target {
+
+	static let swiftSebuf: Target = target(
+		name: .swiftSebuf,
+		dependencies: [
+			.swiftArgumentParser,
+			.swiftProtobuf,
+			.swiftProtobufPluginLibrary
+		]
+	)
+	static let swiftSebufTest: Target = testTarget(name: .swiftSebuf.test, dependencies: [.swiftSebuf])
+}
+
+private extension Target.Dependency {
+
+	// MARK: Modules
+	static let swiftSebuf: Self = byName(name: .swiftSebuf)
+
+	// MARK: Packages
+	static let swiftArgumentParser: Self = product(
+		name: .swiftArgumentParser,
+		package: .swiftArgumentParserPackage
+	)
+	static let swiftProtobuf: Self = product(name: .swiftProtobuf, package: .swiftProtobufPackage)
+	static let swiftProtobufPluginLibrary: Self = product(
+		name: .swiftProtobufPluginLibrary,
+		package: .swiftProtobufPackage
+	)
+}
+
+private extension Package.Dependency {
+
+	static let swiftArgumentParser: Package.Dependency = package(
+		url: "https://github.com/apple/swift-argument-parser.git",
+		exact: "1.6.1"
+	)
+	static let swiftProtobuf: Package.Dependency = package(
+		url: "https://github.com/apple/swift-protobuf.git",
+		exact: "1.31.0"
+	)
+}

swift/Sources/SwiftSebuf/Generator.swift

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+//
+//  Generator.swift
+//  SwiftSebuf
+//
+//  Created by Khaled Chehabeddine on 08/09/2025.
+//  Copyright © 2025 Sebuf. All rights reserved.
+//
+
+import Foundation
+import SwiftProtobuf
+import SwiftProtobufPluginLibrary
+
+protocol Generator {
+
+	init(descriptorSet: DescriptorSet)
+
+	func generate() -> CodeGeneratorResponse
+}

swift/Sources/SwiftSebuf/OneofHelper/OneofHelperCommand.swift

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+//
+//  OneofHelperCommand.swift
+//  SwiftSebuf
+//
+//  Created by Khaled Chehabeddine on 04/09/2025.
+//  Copyright © 2025 Sebuf. All rights reserved.
+//
+
+import ArgumentParser
+import Foundation
+import SwiftProtobuf
+import SwiftProtobufPluginLibrary
+
+@main
+struct OneofHelperCommand: SebufCommand {
+
+	typealias SebufCodeGenerator = OneofHelperGenerator
+
+	static let configuration: CommandConfiguration = .init(
+		commandName: "protoc-gen-swift-oneof-helper",
+		abstract: "Generate Swift oneof helper extensions for protobuf messages"
+	)
+}