Allow confirm-and-save of the Experimental Settings warning. (#7275)

src/main/java/net/minecraftforge/client/ForgeHooksClient.java

@@ -12,6 +12,8 @@ import com.mojang.blaze3d.systems.RenderSystem;
 import com.mojang.blaze3d.vertex.*;
 import com.mojang.datafixers.util.Either;
 import net.minecraft.client.gui.chat.NarratorChatListener;
+import net.minecraft.client.gui.components.toasts.SystemToast;
+import net.minecraft.client.gui.screens.ConfirmScreen;
 import net.minecraft.client.gui.screens.inventory.tooltip.ClientTooltipComponent;
 import net.minecraft.client.gui.screens.multiplayer.JoinMultiplayerScreen;
 import net.minecraft.client.model.Model;
@@ -25,9 +27,9 @@ import net.minecraft.client.player.AbstractClientPlayer;
 import net.minecraft.client.player.LocalPlayer;
 import net.minecraft.locale.Language;
 import net.minecraft.network.Connection;
-import net.minecraft.network.chat.FormattedText;
-import net.minecraft.network.chat.TextComponent;
+import net.minecraft.network.chat.*;
 import net.minecraft.network.protocol.status.ServerStatus;
+import net.minecraft.server.WorldStem;
 import net.minecraft.world.effect.MobEffectInstance;
 import net.minecraft.world.entity.HumanoidArm;
 import net.minecraft.world.inventory.tooltip.TooltipComponent;
@@ -74,6 +76,8 @@ import net.minecraft.world.InteractionHand;
 import net.minecraft.client.player.Input;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.storage.LevelStorageSource;
+import net.minecraft.world.level.storage.PrimaryLevelData;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.EntityHitResult;
 import net.minecraft.world.phys.HitResult;
@@ -81,9 +85,7 @@ import com.mojang.math.Matrix3f;
 import com.mojang.math.Matrix4f;
 import com.mojang.math.Transformation;
 import com.mojang.math.Vector3f;
-import net.minecraft.network.chat.Component;
 import net.minecraft.ChatFormatting;
-import net.minecraft.network.chat.TranslatableComponent;
 import net.minecraft.world.level.GameType;
 import net.minecraft.world.level.BlockAndTintGetter;
 import net.minecraft.world.level.Level;
@@ -1096,4 +1098,46 @@ public class ForgeHooksClient
     {
         return ItemBlockRenderTypes.canRenderInLayer(state, RenderType.solid());
     }
+
+    public static void createWorldConfirmationScreen(
+            LevelStorageSource save, String worldName, boolean creatingWorld,
+            Function<LevelStorageSource.LevelStorageAccess, WorldStem.WorldDataSupplier> worldData,
+            Function<Function<LevelStorageSource.LevelStorageAccess, WorldStem.WorldDataSupplier>, Runnable> runAfter)
+    {
+        Component title = new TranslatableComponent("selectWorld.backupQuestion.experimental");
+        Component msg = new TranslatableComponent("selectWorld.backupWarning.experimental")
+                .append("\n\n")
+                .append(new TranslatableComponent("forge.selectWorld.backupWarning.experimental.additional"));
+
+        Screen screen = new ConfirmScreen(confirmed ->
+        {
+            if (confirmed)
+            {
+                //The WorldData is re-created when re-running the runnable,
+                // so make sure to be setting the field to true on the right instance.
+                runAfter.apply(worldData.andThen(wds -> (rm, dpc) ->
+                        wds.get(rm, dpc).mapFirst(wd -> wd instanceof PrimaryLevelData pld ? pld.withConfirmedWarning(true) : wd))
+                ).run();
+            }
+            else
+            {
+                Minecraft.getInstance().setScreen(null);
+
+                if (creatingWorld) // delete save when cancelling creation.
+                {
+                    try (LevelStorageSource.LevelStorageAccess levelSave = save.createAccess(worldName))
+                    {
+                        levelSave.deleteLevel();
+                    }
+                    catch (IOException e)
+                    {
+                        SystemToast.onWorldDeleteFailure(Minecraft.getInstance(), worldName);
+                        LOGGER.error("Failed to delete world {}", worldName, e);
+                    }
+                }
+            }
+        }, title, msg, CommonComponents.GUI_PROCEED, CommonComponents.GUI_CANCEL);
+
+        Minecraft.getInstance().setScreen(screen);
+    }
 }

src/main/java/net/minecraftforge/common/ForgeHooks.java

@@ -1405,6 +1405,28 @@ public class ForgeHooks
         }
     }
 
+    public static String encodeLifecycle(Lifecycle lifecycle)
+    {
+        if (lifecycle == Lifecycle.stable())
+            return "stable";
+        if (lifecycle == Lifecycle.experimental())
+            return "experimental";
+        if (lifecycle instanceof Lifecycle.Deprecated dep)
+            return "deprecated=" + dep.since();
+        throw new IllegalArgumentException("Unknown lifecycle.");
+    }
+
+    public static Lifecycle parseLifecycle(String lifecycle)
+    {
+        if (lifecycle.equals("stable"))
+            return Lifecycle.stable();
+        if (lifecycle.equals("experimental"))
+            return Lifecycle.experimental();
+        if (lifecycle.startsWith("deprecated="))
+            return Lifecycle.deprecated(Integer.parseInt(lifecycle.substring(lifecycle.indexOf('=') + 1)));
+        throw new IllegalArgumentException("Unknown lifecycle.");
+    }
+  
     public static void saveMobEffect(CompoundTag nbt, String key, MobEffect effect)
     {
         var registryName = effect.getRegistryName();