Build EditorExtension as part of CI job

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

@@ -20,5 +20,13 @@ struct Build: ParsableCommand, BuildCommand {
   func run() throws {
     try buildTarget(packageDir: Paths.packageDir, targetName: "SwiftSyntax-all")
     try buildTarget(packageDir: Paths.examplesDir, targetName: "Examples-all")
+    try buildEditorExtension()
+  }
+
+  private func buildEditorExtension() throws {
+    #if os(macOS)
+    logSection("Building Editor Extension")
+    try invokeXcodeBuild(projectPath: Paths.editorExtensionProjectPath)
+    #endif
   }
 }

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

@@ -89,6 +89,27 @@ extension BuildCommand {
     return result
   }
 
+  @discardableResult
+  func invokeXcodeBuild(projectPath: URL) throws -> ProcessResult {
+    guard let xcodebuildExec = Paths.xcodebuildExec else {
+      throw ScriptExectutionError(
+        message: """
+          Error: Could not find xcodebuild.
+          Looking at '\(Paths.xcodebuildExec?.path ?? "N/A")'.
+          """
+      )
+    }
+    let processRunner = ProcessRunner(
+      executableURL: xcodebuildExec,
+      arguments: ["-project", projectPath.path],
+      additionalEnvironment: [:]
+    )
+
+    let result = try processRunner.run(verbose: arguments.verbose)
+
+    return result
+  }
+
   private func build(packageDir: URL, name: String, isProduct: Bool) throws {
     let args: [String]
 

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

@@ -37,6 +37,12 @@ enum Paths {
       .appendingPathComponent("CodeGeneration")
   }
 
+  static var editorExtensionProjectPath: URL {
+    packageDir
+      .appendingPathComponent("EditorExtension")
+      .appendingPathComponent("SwiftRefactorExtension.xcodeproj")
+  }
+
   static var workspaceDir: URL {
     packageDir
       .deletingLastPathComponent()
@@ -63,6 +69,10 @@ enum Paths {
     return lookupExecutable(for: "diff")
   }
 
+  static var xcodebuildExec: URL? {
+    return lookupExecutable(for: "xcodebuild")
+  }
+
   private static var envSearchPaths: [URL] {
     // Compute search paths from PATH variable.
     #if os(Windows)