feat: add experimental minecartMaxSpeedMultiplier rule

src/main/java/de/rubixdev/rug/RugSettings.java

@@ -876,6 +876,26 @@ public String description() {
 
     @Rule(categories = {CREATIVE, RUG})
     public static boolean waterInNether = false;
+
+    public static class validatorMinecartMaxSpeedMultiplier extends Validator<Double> {
+        @Override
+        public Double validate(
+                ServerCommandSource source, CarpetRule<Double> currentRule, Double newValue, String string) {
+            return newValue >= 0.25 && newValue <= 4 ? newValue : null;
+        }
+
+        @Override
+        public String description() {
+            return "You must choose a value between 0.25 and 4.0";
+        }
+    }
+
+    @Rule(
+            categories = {EXPERIMENTAL, RUG},
+            strict = false,
+            options = {"0.5", "1.0", "2.0", "4.0"},
+            validators = validatorMinecartMaxSpeedMultiplier.class)
+    public static double minecartMaxSpeedMultiplier = 1.0;
 }
 
 // BUGFIX

src/main/java/de/rubixdev/rug/mixins/AbstractMinecartEntityMixin.java

@@ -0,0 +1,18 @@
+package de.rubixdev.rug.mixins;
+
+import de.rubixdev.rug.RugSettings;
+import net.minecraft.entity.vehicle.AbstractMinecartEntity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(AbstractMinecartEntity.class)
+public class AbstractMinecartEntityMixin {
+    @Inject(method = "getMaxSpeed", at = @At("RETURN"), cancellable = true)
+    private void applyMultiplier(CallbackInfoReturnable<Double> cir) {
+        if (RugSettings.minecartMaxSpeedMultiplier != 1.0) {
+            cir.setReturnValue(cir.getReturnValueD() * RugSettings.minecartMaxSpeedMultiplier);
+        }
+    }
+}

src/main/java/de/rubixdev/rug/mixins/FurnaceMinecartEntityMixin.java

@@ -0,0 +1,18 @@
+package de.rubixdev.rug.mixins;
+
+import de.rubixdev.rug.RugSettings;
+import net.minecraft.entity.vehicle.FurnaceMinecartEntity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(FurnaceMinecartEntity.class)
+public class FurnaceMinecartEntityMixin {
+    @Inject(method = "getMaxSpeed", at = @At("RETURN"), cancellable = true)
+    private void applyMultiplier(CallbackInfoReturnable<Double> cir) {
+        if (RugSettings.minecartMaxSpeedMultiplier != 1.0) {
+            cir.setReturnValue(cir.getReturnValueD() * RugSettings.minecartMaxSpeedMultiplier);
+        }
+    }
+}

src/main/resources/assets/rug/lang/en_us.json5

@@ -149,6 +149,8 @@
   "carpet.rule.maxBannerLayers.desc": "Maximum number of layers, that can be applied to a banner",
   "carpet.rule.maxBannerLayers.extra.0": "This only works for clients with this mod installed and the Banner tooltips never show more than 6 layers",
   "carpet.rule.maxBannerLayers.additional": "[Idea from SouthernPixel](https://github.com/gnembon/carpet-extra/issues/111)",
+  // minecartMaxSpeedMultiplier
+  "carpet.rule.minecartMaxSpeedMultiplier.desc": "Maximum minecart speed multiplier",
   // missingCobbleRecipes
   "carpet.rule.missingCobbleRecipes.desc": "Adds missing recipes for allowing blackstone and cobbled deepslate in place of cobblestone",
   "carpet.rule.missingCobbleRecipes.extra.0": "Expect a lag spike when changing the value",

src/main/resources/rug.mixins.json

@@ -9,6 +9,7 @@
     "AbstractBlockMixin",
     "AbstractCauldronBlockMixin",
     "AbstractFurnaceBlockEntityMixin",
+    "AbstractMinecartEntityMixin",
     "AbstractPlantStemBlockMixin",
     "AbstractPressurePlateBlockMixin",
     "AbstractRedstoneGateBlockMixin",
@@ -32,6 +33,7 @@
     "FallingBlockMixin",
     "FishingBobberEntityMixin",
     "FluidBlockMixin",
+    "FurnaceMinecartEntityMixin",
     "GhastEntityMixin",
     "HungerManagerMixin",
     "IceBlockMixin",