Documented the AppArguments protocol and the Environment+Properties extension in the library target.

App/Sources/AppOptions.swift

@@ -11,10 +11,10 @@ extension App {
         var hostname: String = "127.0.0.1"
         
         @Option(name: .shortAndLong)
-        var port: Int = 8080
+        var logLevel: Logger.Level?
 
         @Option(name: .shortAndLong)
-        var logLevel: Logger.Level?
+        var port: Int = 8080
 
     }
 }

Library/Sources/Public/Extensions/Environment+Properties.swift

@@ -4,6 +4,7 @@ extension Environment {
     
     // MARK: Computed
     
+    /// The logging level set in the environment variables.
     public var logLevel: String? {
         self.get("LOG_LEVEL")
     }

Library/Sources/Public/Protocols/AppArguments.swift

@@ -1,11 +1,15 @@
 import Logging
 
+/// A type that defines the input arguments that the `Hummingbird`app receives.
 public protocol AppArguments {
     
     // MARK: Properties
     
+    /// A bind address for the app.
     var hostname: String { get }
+    /// A logging level to configure for the app.
     var logLevel: Logger.Level? { get }
+    /// A port for the app to use,
     var port: Int { get }
     
 }

Test/Sources/Helpers/TestArguments.swift

@@ -6,7 +6,7 @@ struct TestArguments: AppArguments {
     // MARK: Properties
     
     let hostname = "127.0.0.1"
-    let port = 0
     let logLevel: Logger.Level? = .trace
+    let port = 0
     
 }