Headless in Avalonia v2 (#448)

Launch the Ryujinx.exe, first argument --no-gui or nogui, and the rest of the arguments should be your normal headless script. You can include the new option --use-main-config which will provide any arguments that you don't, filled in from your main config made by the UI.

Input config is not inherited at this time.

src/Ryujinx/Headless/HeadlessDynamicTextInputHandler.cs

@@ -0,0 +1,48 @@
+using Ryujinx.HLE.UI;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Ryujinx.Headless
+{
+    /// <summary>
+    /// Headless text processing class, right now there is no way to forward the input to it.
+    /// </summary>
+    internal class HeadlessDynamicTextInputHandler : IDynamicTextInputHandler
+    {
+        private bool _canProcessInput;
+
+        public event DynamicTextChangedHandler TextChangedEvent;
+        public event KeyPressedHandler KeyPressedEvent { add { } remove { } }
+        public event KeyReleasedHandler KeyReleasedEvent { add { } remove { } }
+
+        public bool TextProcessingEnabled
+        {
+            get => Volatile.Read(ref _canProcessInput);
+
+            set
+            {
+                Volatile.Write(ref _canProcessInput, value);
+
+                // Launch a task to update the text.
+                Task.Run(() =>
+                {
+                    Thread.Sleep(100);
+                    TextChangedEvent?.Invoke("Ryujinx", 7, 7, false);
+                });
+            }
+        }
+
+        public HeadlessDynamicTextInputHandler()
+        {
+            // Start with input processing turned off so the text box won't accumulate text
+            // if the user is playing on the keyboard.
+            _canProcessInput = false;
+        }
+
+        public void SetText(string text, int cursorBegin) { }
+
+        public void SetText(string text, int cursorBegin, int cursorEnd) { }
+
+        public void Dispose() { }
+    }
+}