Fix for MC-177381

src/main/java/carpetfixes/CFSettings.java

@@ -1248,6 +1248,10 @@ public class CFSettings {
     )
     public static boolean structuresIgnorePassengersFix = false;
 
+    @Rule(
+            categories = {BUGFIX, RECOMMENDED}
+    )
+    public static boolean locateCommandDistanceFix = false;
 
     /*
 

src/main/java/carpetfixes/mixins/commandFixes/LocateCommand_distanceFixMixin.java

@@ -0,0 +1,25 @@
+package carpetfixes.mixins.commandFixes;
+
+import carpetfixes.CFSettings;
+import net.minecraft.server.command.LocateCommand;
+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;
+
+/**
+ * Fixes the LocateCommand distance calculation when the structure is more than 46340 blocks away.
+ */
+
+@Mixin(LocateCommand.class)
+public class LocateCommand_distanceFixMixin {
+
+    @Inject(at = @At("TAIL"), method = "getDistance", cancellable = true)
+    private static void getDistance(int x1, int y1, int x2, int y2, CallbackInfoReturnable<Float> cir) {
+        if (CFSettings.locateCommandDistanceFix) {
+            double d = x2 - x1;
+            double e = y2 - y1;
+            cir.setReturnValue((float) Math.hypot(d, e));
+        }
+    }
+}

src/main/resources/assets/carpet-fixes/lang/en_us.json

@@ -221,6 +221,7 @@
 	"carpet-fixes.rule.lecternBlockDupeFix.desc": "Fixes a lectern block dupe, it just dupes the lectern block",
 	"carpet-fixes.rule.lightningKillsDropsFix.desc": "Fixes Lightning killing the items that drop from entities it kills",
 	"carpet-fixes.rule.lightningKillsDropsFix.extra": "[MC-206922](https://bugs.mojang.com/browse/MC-206922)",
+	"carpet-fixes.rule.locateCommandDistanceFix.desc": "[MC-177381](https://bugs.mojang.com/browse/MC-177381), fixes the locate command reporting wrong distances",
 	"carpet-fixes.rule.markerArmorStandsCreateBubblesFix.desc": "Fixes marker armor stands creating bubbles in water",
 	"carpet-fixes.rule.markerArmorStandsCreateBubblesFix.extra": "[MC-78314](https://bugs.mojang.com/browse/MC-78314)",
 	"carpet-fixes.rule.markerArmorStandsTriggerBlocksFix.desc": "Fixes marker armor stands being able to trigger traps such as pressure plates, and string",

src/main/resources/carpet-fixes.mixins.json

@@ -99,6 +99,7 @@
     "blockUpdates.TreeDirtMissingUpdates.TrunkPlacer_logMixin",
     "brainFixes.FrogBrain_frictionMixin",
     "brainFixes.GoatBrain_frictionMixin",
+    "commandFixes.LocateCommand_distanceFixMixin",
     "conversionFixes.MobEntity_conversionMixin",
     "conversionFixes.MooshroomEntity_conversionMixin",
     "conversionFixes.SlimeEntity_conversionMixin",