KSP Collapsed PAW Inventories HarmonyPatch

KSPCollapsedPAWInventoriesHarmonyPatch.cs

	// Add a collapsed by default PAW group to all ModuleInventoryPart :
	[HarmonyPatch(typeof(ModuleInventoryPart))]
	[HarmonyPatch("OnStart")]
	class ModuleInventoryPart_OnStart
	{
		static void Postfix(ModuleInventoryPart __instance)
		{
			__instance.Fields["InventorySlots"].group = new BasePAWGroup("Inventory", "Inventory", true);
		}

	}

	// Kerbal inventories are already in a PAW group, use a transpiler to make it collapsed by default :
	[HarmonyPatch(typeof(UIPartActionWindow))]
	[HarmonyPatch("AddCrewInventory")]
	[HarmonyPatch(new Type[] { typeof(ProtoCrewMember)})]
	class UIPartActionWindow_AddCrewInventory
	{
		static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions)
		{
			List<CodeInstruction> code = new List<CodeInstruction>(instructions);

			MethodInfo addGroup = AccessTools.Method(typeof(UIPartActionWindow), "AddGroup", new[] {typeof(UnityEngine.Transform), typeof(string), typeof(bool)});

			for (int i = 0; i < code.Count - 1; i++) // -1 since we will be checking i + 1
			{
				// We want to set startCollapsed to true :

				// AddGroup(uIPartActionFieldItem.transform, displayName, startCollapsed: false);
				// IL_00c5: ldarg.0
				// IL_00c6: ldloc.3
				// IL_00c7: callvirt instance class [UnityEngine.CoreModule]
				// UnityEngine.Transform[UnityEngine.CoreModule] UnityEngine.Component::get_transform()
				// IL_00cc: ldloc.s 4
				// IL_00ce: ldc.i4.0
				// IL_00cf: call instance void UIPartActionWindow::AddGroup(class [UnityEngine.CoreModule] UnityEngine.Transform, string, bool)

				if (code[i].opcode == OpCodes.Ldc_I4_0 && code[i + 1].opcode == OpCodes.Call && (MethodInfo)code[i + 1].operand == addGroup)
				{
					code[i].opcode = OpCodes.Ldc_I4_1;
					break;
				}
			}

			return code;
		}
	}