Examples: Adopt ArgumentParser

Author: euanh

Examples/HelloWorldWithResources/Package.swift

@@ -22,11 +22,15 @@ let package = Package(
     dependencies: [
         .package(url: "https://github.com/hummingbird-project/hummingbird.git", from: "2.1.0"),
         .package(url: "https://github.com/apple/swift-container-plugin", from: "0.5.0"),
+        .package(url: "https://github.com/apple/swift-argument-parser", from: "1.3.0"),
     ],
     targets: [
         .executableTarget(
             name: "hello-world",
-            dependencies: [.product(name: "Hummingbird", package: "hummingbird")],
+            dependencies: [
+                .product(name: "Hummingbird", package: "hummingbird"),
+                .product(name: "ArgumentParser", package: "swift-argument-parser"),
+            ],
             resources: [.process("resources")]
         )
     ]

Examples/HelloWorldWithResources/Sources/App.swift

@@ -12,12 +12,17 @@
 //
 //===----------------------------------------------------------------------===//
 
+import ArgumentParser
+
 @main
-struct Hello {
-    static let hostname = "0.0.0.0"
-    static let port = 8080
+struct Hello: AsyncParsableCommand {
+    @Option(name: .shortAndLong)
+    var hostname: String = "0.0.0.0"
+
+    @Option(name: .shortAndLong)
+    var port: Int = 8080
 
-    static func main() async throws {
+    func run() async throws {
         let app = buildApplication(
             configuration: .init(
                 address: .hostname(hostname, port: port),