From a4601581315bdbd06770c5569ba5e2e817ded301 Mon Sep 17 00:00:00 2001
From: rushiiMachine <33725716+rushiiMachine@users.noreply.github.com>
Date: Sun, 24 Mar 2024 10:14:07 -0700
Subject: [PATCH] feat: PatchEnableOptionsWhilePlaying

---
 .../Patches/PatchEnableOptionsWhilePlaying.cs | 55 +++++++++++++++++++
 Osu.Stubs/Options.cs                          | 37 +++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 Osu.Patcher.Hook/Patches/PatchEnableOptionsWhilePlaying.cs
 create mode 100644 Osu.Stubs/Options.cs

diff --git a/Osu.Patcher.Hook/Patches/PatchEnableOptionsWhilePlaying.cs b/Osu.Patcher.Hook/Patches/PatchEnableOptionsWhilePlaying.cs
new file mode 100644
index 0000000..d1d6f69
--- /dev/null
+++ b/Osu.Patcher.Hook/Patches/PatchEnableOptionsWhilePlaying.cs
@@ -0,0 +1,55 @@
+using System.Collections.Generic;
+using System.Reflection;
+using HarmonyLib;
+using JetBrains.Annotations;
+using Osu.Stubs;
+using static System.Reflection.Emit.OpCodes;
+
+namespace Osu.Patcher.Hook.Patches;
+
+/// <summary>
+///     Allows the options screen to be expanded (with Ctrl-O) while in a Play state.
+///     Changes the following code in <c>osu.GameModes.Options.Options:get_CanExpand()</c>:
+///     <br /><br />
+///     From:
+///     <code><![CDATA[
+///         case OsuModes.Play:
+///             return ModManager.CheckActive(Mods.Autoplay);
+///     ]]></code>
+///     To:
+///     <code><![CDATA[
+///         case OsuModes.Play:
+///             ModManager.CheckActive(Mods.Autoplay);
+///             return true;
+///     ]]></code>
+/// </summary>
+[HarmonyPatch]
+[UsedImplicitly]
+public class PatchEnableOptionsWhilePlaying : BasePatch
+{
+    [UsedImplicitly]
+    [HarmonyTargetMethod]
+    private static MethodBase Target() => Options.GetCanExpand.Reference;
+
+    [UsedImplicitly]
+    [HarmonyTranspiler]
+    private static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions) =>
+        InsertAfterSignature(
+            instructions,
+            new[]
+            {
+                Ldloc_2,
+                Ldloc_3,
+                And,
+                Ldc_I4_0,
+                Cgt,
+                // -- Inject right here to replace the result of Cgt --
+                // Ret,
+            },
+            new CodeInstruction[]
+            {
+                new(Pop),
+                new(Ldc_I4_1), // Push "true" onto stack
+            }
+        );
+}
\ No newline at end of file
diff --git a/Osu.Stubs/Options.cs b/Osu.Stubs/Options.cs
new file mode 100644
index 0000000..1d2ab65
--- /dev/null
+++ b/Osu.Stubs/Options.cs
@@ -0,0 +1,37 @@
+using JetBrains.Annotations;
+using Osu.Stubs.Opcode;
+using static System.Reflection.Emit.OpCodes;
+
+namespace Osu.Stubs;
+
+/// <summary>
+///     Original: <c>osu.GameModes.Options.Options</c>
+///     b20240123: <c>#=zIP$6zD_IcaL0ugvXAFTvJYG2gFLx</c>
+/// </summary>
+[UsedImplicitly]
+public class Options
+{
+    /// <summary>
+    ///     Original: <c>CanExpand</c> (property getter)
+    ///     b20240123: <c>#=zxcgzxWXF$WLr</c>
+    /// </summary>
+    [UsedImplicitly]
+    public static readonly LazyMethod<bool> GetCanExpand = new(
+        "Options#get_CanExpand",
+        new[]
+        {
+            Ldc_I4,
+            Stloc_1,
+            Ldsfld,
+            Ldloc_1,
+            Stloc_3,
+            Stloc_2,
+            Ldloc_2,
+            Ldloc_3,
+            And,
+            Ldc_I4_0,
+            Cgt,
+            Ret,
+        }
+    );
+}
\ No newline at end of file