Transfer from local Git

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+
+indent_size = 4
+indent_style = space
+
+insert_final_newline = true
+trim_trailing_whitespace = true

.gitignore

@@ -0,0 +1,12 @@
+.vscode
+.idea
+.gradle
+.settings
+.project
+.classpath
+gradle
+gradlew
+gradlew*
+bin
+run
+build

LICENSE

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+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
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+    REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
+    PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
+    THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
+    HEREUNDER.
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
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+
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+limitation commercial, advertising or promotional purposes (the
+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+    surrendered, licensed or otherwise affected by this document.
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+ c. Affirmer disclaims responsibility for clearing rights of other persons
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+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.

README.md

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+# Fabric Example Mod
+
+## Setup
+
+For setup instructions please see the [fabric wiki page](https://fabricmc.net/wiki/tutorial:setup) that relates to the IDE that you are using.
+
+## License
+
+This template is available under the CC0 license. Feel free to learn from it and incorporate it in your own projects.

build.gradle

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+plugins {
+	id 'fabric-loom' version '1.1-SNAPSHOT'
+	id 'maven-publish'
+}
+
+sourceCompatibility = JavaVersion.VERSION_17
+targetCompatibility = JavaVersion.VERSION_17
+
+archivesBaseName = project.archives_base_name
+version = project.mod_version
+group = project.maven_group
+
+repositories {
+	// Add repositories to retrieve artifacts from in here.
+	// You should only use this when depending on other mods because
+	// Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
+	// See https://docs.gradle.org/current/userguide/declaring_repositories.html
+	// for more information about repositories.
+}
+
+dependencies {
+	// To change the versions see the gradle.properties file
+	minecraft "com.mojang:minecraft:${project.minecraft_version}"
+	mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
+	modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+
+	// Fabric API. This is technically optional, but you probably want it anyway.
+	modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
+
+	// Uncomment the following line to enable the deprecated Fabric API modules. 
+	// These are included in the Fabric API production distribution and allow you to update your mod to the latest modules at a later more convenient time.
+
+	// modImplementation "net.fabricmc.fabric-api:fabric-api-deprecated:${project.fabric_version}"
+}
+
+processResources {
+	inputs.property "version", project.version
+
+	filesMatching("fabric.mod.json") {
+		expand "version": project.version
+	}
+}
+
+tasks.withType(JavaCompile).configureEach {
+	// Minecraft 1.18 (1.18-pre2) upwards uses Java 17.
+	it.options.release = 17
+}
+
+java {
+	// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
+	// if it is present.
+	// If you remove this line, sources will not be generated.
+	withSourcesJar()
+}
+
+jar {
+	from("LICENSE") {
+		rename { "${it}_${project.archivesBaseName}"}
+	}
+}
+
+// configure the maven publication
+publishing {
+	publications {
+		mavenJava(MavenPublication) {
+			from components.java
+		}
+	}
+
+	// See https://docs.gradle.org/current/userguide/publishing_maven.html for information on how to set up publishing.
+	repositories {
+		// Add repositories to publish to here.
+		// Notice: This block does NOT have the same function as the block in the top level.
+		// The repositories here will be used for publishing your artifact, not for
+		// retrieving dependencies.
+	}
+}

gradle.properties

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+# Done to increase the memory available to gradle.
+org.gradle.jvmargs=-Xmx1G
+org.gradle.parallel=true
+
+# Fabric Properties
+	# check these on https://fabricmc.net/develop
+	minecraft_version=1.19.3
+	yarn_mappings=1.19.3+build.5
+	loader_version=0.14.14
+
+# Mod Properties
+	mod_version = 1.0.0
+	maven_group = com.example
+	archives_base_name = fabric-example-mod
+
+# Dependencies
+	fabric_version=0.74.0+1.19.3

settings.gradle

@@ -0,0 +1,10 @@
+pluginManagement {
+    repositories {
+        maven {
+            name = 'Fabric'
+            url = 'https://maven.fabricmc.net/'
+        }
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}

src/main/java/me/pog5/leashmod/LeashImpl.java

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+package me.pog5.leashmod;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.Hand;
+
+public interface LeashImpl {
+    ActionResult leashplayers$interact(PlayerEntity player, Hand hand);
+}

src/main/java/me/pog5/leashmod/LeashPlayers.java

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+package me.pog5.leashmod;
+
+import net.fabricmc.api.ModInitializer;
+import net.fabricmc.fabric.api.gamerule.v1.GameRuleFactory;
+import net.fabricmc.fabric.api.gamerule.v1.GameRuleRegistry;
+import net.fabricmc.fabric.api.gamerule.v1.rule.DoubleRule;
+import net.minecraft.world.GameRules;
+import net.minecraft.world.World;
+
+public final class LeashPlayers implements ModInitializer {
+    private static GameRules.Key<GameRules.BooleanRule> ruleEnabled;
+    private static GameRules.Key<DoubleRule> ruleDistanceMin;
+    private static GameRules.Key<DoubleRule> ruleDistanceMax;
+
+    public static LeashSettings getSettings(World world) {
+        return new LeashSettings() {
+            private GameRules getGameRules() {
+                return world.getGameRules();
+            }
+
+            @Override
+            public boolean isEnabled() {
+                return getGameRules().getBoolean(ruleEnabled);
+            }
+
+            @Override
+            public double getDistanceMin() {
+                return getGameRules().get(ruleDistanceMin).get();
+            }
+
+            @Override
+            public double getDistanceMax() {
+                return getGameRules().get(ruleDistanceMax).get();
+            }
+        };
+    }
+
+    @Override
+    public void onInitialize() {
+        ruleEnabled = GameRuleRegistry.register("leashPlayersEnabled", GameRules.Category.PLAYER, GameRuleFactory.createBooleanRule(true));
+        ruleDistanceMin = GameRuleRegistry.register("leashPlayersDistanceMin", GameRules.Category.PLAYER, GameRuleFactory.createDoubleRule(4.0D));
+        ruleDistanceMax = GameRuleRegistry.register("leashPlayersDistanceMax", GameRules.Category.PLAYER, GameRuleFactory.createDoubleRule(10.0D));
+    }
+}

src/main/java/me/pog5/leashmod/LeashProxyEntity.java

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+package me.pog5.leashmod;
+
+import net.minecraft.entity.*;
+import net.minecraft.entity.passive.TurtleEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.scoreboard.AbstractTeam;
+import net.minecraft.scoreboard.ServerScoreboard;
+import net.minecraft.scoreboard.Team;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.util.math.Vec3d;
+
+import java.util.Objects;
+
+public final class LeashProxyEntity extends TurtleEntity {
+    private final LivingEntity target;
+
+    private boolean proxyUpdate() {
+        if (proxyIsRemoved()) return false;
+
+        if (target == null) return true;
+        if (target.world != world || !target.isAlive()) return true;
+
+        Vec3d posActual = getPos();
+        Vec3d posTarget = target.getPos().add(0.0D, 1.3D, -0.15D);
+
+        if (!Objects.equals(posActual, posTarget)) {
+            setRotation(0.0F, 0.0F);
+            setPos(posTarget.getX(), posTarget.getY(), posTarget.getZ());
+            setBoundingBox(getDimensions(EntityPose.DYING).getBoxAt(posTarget));
+        }
+
+        updateLeash();
+
+        return false;
+    }
+
+    @Override
+    public void tick() {
+        if (world.isClient) return;
+        if (proxyUpdate() && !proxyIsRemoved()) {
+            proxyRemove();
+        }
+    }
+
+    public boolean proxyIsRemoved() {
+        return this.isRemoved();
+    }
+
+    public void proxyRemove() {
+        super.remove(RemovalReason.DISCARDED);
+    }
+
+    @Override
+    public void remove(RemovalReason reason) {
+    }
+
+    public static final String TEAM_NAME = "leashplayersimpl";
+
+    public LeashProxyEntity(LivingEntity target) {
+        super(EntityType.TURTLE, target.world);
+
+        this.target = target;
+
+        setHealth(1.0F);
+        setInvulnerable(true);
+
+        setBaby(true);
+        setInvisible(true);
+        noClip = true;
+
+        MinecraftServer server = getServer();
+        if (server != null) {
+            ServerScoreboard scoreboard = server.getScoreboard();
+
+            Team team = scoreboard.getTeam(TEAM_NAME);
+            if (team == null) {
+                team = scoreboard.addTeam(TEAM_NAME);
+            }
+            if (team.getCollisionRule() != AbstractTeam.CollisionRule.NEVER) {
+                team.setCollisionRule(AbstractTeam.CollisionRule.NEVER);
+            }
+
+            scoreboard.addPlayerToTeam(getEntityName(), team);
+        }
+    }
+
+    @Override
+    public float getHealth() {
+        return 1.0F;
+    }
+
+    @Override
+    public void detachLeash(boolean sendPacket, boolean dropItem) {
+    }
+
+    @Override
+    public boolean canBeLeashedBy(PlayerEntity player) {
+        return false;
+    }
+
+    @Override
+    protected void initGoals() {
+    }
+
+    @Override
+    protected void pushAway(Entity entity) {
+    }
+
+    @Override
+    public void pushAwayFrom(Entity entity) {
+    }
+
+    @Override
+    public void onPlayerCollision(PlayerEntity player) {
+    }
+}

src/main/java/me/pog5/leashmod/LeashSettings.java

@@ -0,0 +1,7 @@
+package me.pog5.leashmod;
+
+public interface LeashSettings {
+    boolean isEnabled();
+    double getDistanceMin();
+    double getDistanceMax();
+}

src/main/java/me/pog5/leashmod/mixin/MixinPlayerEntity.java

@@ -0,0 +1,26 @@
+package me.pog5.leashmod.mixin;
+
+import me.pog5.leashmod.LeashImpl;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.Hand;
+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(PlayerEntity.class)
+public abstract class MixinPlayerEntity {
+    @Inject(method = "interact(Lnet/minecraft/entity/Entity;Lnet/minecraft/util/Hand;)Lnet/minecraft/util/ActionResult;", at = @At("RETURN"), cancellable = true)
+    private void leashplayers$onInteract(Entity entity, Hand hand, CallbackInfoReturnable<ActionResult> info) {
+        if (info.getReturnValue() != ActionResult.PASS) return;
+        if ((Object) this instanceof ServerPlayerEntity && entity instanceof LeashImpl) {
+            ServerPlayerEntity player = (ServerPlayerEntity) (Object) this;
+            LeashImpl impl = (LeashImpl) entity;
+            info.setReturnValue(impl.leashplayers$interact(player, hand));
+            info.cancel();
+        }
+    }
+}

src/main/java/me/pog5/leashmod/mixin/MixinServerPlayerEntity.java

@@ -0,0 +1,157 @@
+package me.pog5.leashmod.mixin;
+
+import me.pog5.leashmod.LeashImpl;
+import me.pog5.leashmod.LeashPlayers;
+import me.pog5.leashmod.LeashProxyEntity;
+import me.pog5.leashmod.LeashSettings;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.network.packet.s2c.play.EntityVelocityUpdateS2CPacket;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.Hand;
+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.CallbackInfo;
+
+@Mixin(ServerPlayerEntity.class)
+public abstract class MixinServerPlayerEntity implements LeashImpl {
+    private final ServerPlayerEntity leashplayers$self = (ServerPlayerEntity) (Object) this;
+    private final LeashSettings leashplayers$settings = LeashPlayers.getSettings(leashplayers$self.world);
+
+    private LeashProxyEntity leashplayers$proxy;
+    private Entity leashplayers$holder;
+
+    private int leashplayers$lastage;
+
+    private boolean leashplayers$disabled() {
+        return !leashplayers$settings.isEnabled();
+    }
+
+    private void leashplayers$update() {
+        if (
+            leashplayers$holder != null && (
+                leashplayers$disabled()
+                || !leashplayers$holder.isAlive()
+                || !leashplayers$self.isAlive()
+                || leashplayers$self.hasVehicle()
+            )
+        ) {
+            leashplayers$detach();
+            leashplayers$drop();
+        }
+
+        if (leashplayers$proxy != null) {
+            if (leashplayers$proxy.proxyIsRemoved()) {
+                leashplayers$proxy = null;
+            }
+            else {
+                Entity holderActual = leashplayers$holder;
+                Entity holderTarget = leashplayers$proxy.getHoldingEntity();
+
+                if (holderTarget == null && holderActual != null) {
+                    leashplayers$detach();
+                    leashplayers$drop();
+                }
+                else if (holderTarget != holderActual) {
+                    leashplayers$attach(holderTarget);
+                }
+            }
+        }
+
+        leashplayers$apply();
+    }
+
+    private void leashplayers$apply() {
+        ServerPlayerEntity player = leashplayers$self;
+        Entity holder = leashplayers$holder;
+        if (holder == null) return;
+        if (holder.world != player.world) return;
+
+        float distance = player.distanceTo(holder);
+        if (distance < leashplayers$settings.getDistanceMin()) {
+            return;
+        }
+        if (distance > leashplayers$settings.getDistanceMax()) {
+            leashplayers$detach();
+            leashplayers$drop();
+            return;
+        }
+
+        double dx = (holder.getX() - player.getX()) / (double) distance;
+        double dy = (holder.getY() - player.getY()) / (double) distance;
+        double dz = (holder.getZ() - player.getZ()) / (double) distance;
+
+        player.addVelocity(
+            Math.copySign(dx * dx * 0.4D, dx),
+            Math.copySign(dy * dy * 0.4D, dy),
+            Math.copySign(dz * dz * 0.4D, dz)
+        );
+
+        player.networkHandler.sendPacket(new EntityVelocityUpdateS2CPacket(player));
+        player.velocityDirty = false;
+    }
+
+    private void leashplayers$attach(Entity entity) {
+        leashplayers$holder = entity;
+
+        if (leashplayers$proxy == null) {
+            leashplayers$proxy = new LeashProxyEntity(leashplayers$self);
+            leashplayers$self.world.spawnEntity(leashplayers$proxy);
+        }
+        leashplayers$proxy.attachLeash(leashplayers$holder, true);
+
+        if (leashplayers$self.hasVehicle()) {
+            leashplayers$self.stopRiding();
+        }
+
+        leashplayers$lastage = leashplayers$self.age;
+    }
+
+    private void leashplayers$detach() {
+        leashplayers$holder = null;
+
+        if (leashplayers$proxy != null) {
+            if (leashplayers$proxy.isAlive() || !leashplayers$proxy.proxyIsRemoved()) {
+                leashplayers$proxy.proxyRemove();
+            }
+            leashplayers$proxy = null;
+        }
+    }
+
+    private void leashplayers$drop() {
+        leashplayers$self.dropItem(Items.LEAD);
+    }
+
+    @Inject(method = "tick()V", at = @At("TAIL"))
+    private void leashplayers$tick(CallbackInfo info) {
+        leashplayers$update();
+    }
+
+    @Override
+    public ActionResult leashplayers$interact(PlayerEntity player, Hand hand) {
+        if (leashplayers$disabled()) return ActionResult.PASS;
+
+        ItemStack stack = player.getStackInHand(hand);
+        if (stack.getItem() == Items.LEAD && leashplayers$holder == null) {
+            if (!player.isCreative()) {
+                stack.decrement(1);
+            }
+            leashplayers$attach(player);
+            return ActionResult.SUCCESS;
+        }
+
+        if (leashplayers$holder == player && leashplayers$lastage + 20 < leashplayers$self.age) {
+            if (!player.isCreative()) {
+                leashplayers$drop();
+            }
+            leashplayers$detach();
+            return ActionResult.SUCCESS;
+        }
+
+        return ActionResult.PASS;
+    }
+}

src/main/java/me/pog5/leashmod/mixin/MixinServerWorld.java

@@ -0,0 +1,20 @@
+package me.pog5.leashmod.mixin;
+
+import me.pog5.leashmod.LeashProxyEntity;
+import net.minecraft.entity.Entity;
+import net.minecraft.server.world.ServerWorld;
+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(ServerWorld.class)
+public abstract class MixinServerWorld {
+    @Inject(method = "shouldCancelSpawn(Lnet/minecraft/entity/Entity;)Z", at = @At("HEAD"), cancellable = true, require = 0)
+    private void leashplayers$onShouldCancelSpawn(Entity entity, CallbackInfoReturnable<Boolean> info) {
+        if (entity instanceof LeashProxyEntity) {
+            info.setReturnValue(false);
+            info.cancel();
+        }
+    }
+}

src/main/java/me/pog5/leashmod/mixin/MixinTurtleEntity.java

@@ -0,0 +1,29 @@
+package me.pog5.leashmod.mixin;
+
+import me.pog5.leashmod.LeashProxyEntity;
+import net.minecraft.entity.passive.TurtleEntity;
+import net.minecraft.scoreboard.Team;
+import net.minecraft.server.MinecraftServer;
+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.CallbackInfo;
+
+import java.util.Objects;
+
+@Mixin(TurtleEntity.class)
+public abstract class MixinTurtleEntity {
+    @Inject(method = "readCustomDataFromNbt(Lnet/minecraft/nbt/NbtCompound;)V", at = @At("RETURN"))
+    private void leashplayers$onReadCustomDataFromNbt(CallbackInfo info) {
+        TurtleEntity self = (TurtleEntity) (Object) this;
+
+        MinecraftServer server = self.getServer();
+        if (server == null) return;
+
+        Team team = server.getScoreboard().getPlayerTeam(self.getEntityName());
+        if (team != null && Objects.equals(team.getName(), LeashProxyEntity.TEAM_NAME)) {
+            self.setInvulnerable(false);
+            self.setHealth(0.0F);
+        }
+    }
+}

src/main/resources/assets/leashplayers/lang/en_us.json

@@ -0,0 +1,5 @@
+{
+    "gamerule.leashPlayersEnabled": "Enable players leading other players",
+    "gamerule.leashPlayersDistanceMin": "Minimum player lead length before applying knockback",
+    "gamerule.leashPlayersDistanceMax": "Maximum player lead length before breaking"
+}

src/main/resources/fabric.mod.json

@@ -0,0 +1,38 @@
+{
+  "schemaVersion": 1,
+  "id": "leashmod",
+  "version": "${version}",
+
+  "name": "Pog5's Leashable Players",
+  "description": "A simple mod that let's you leash players.",
+  "authors": [
+    "Me!"
+  ],
+  "contact": {
+    "homepage": "https://fabricmc.net/",
+    "sources": "https://github.com/FabricMC/fabric-example-mod"
+  },
+
+  "license": "CC0-1.0",
+  "icon": "assets/modid/icon.png",
+
+  "environment": "*",
+  "entrypoints": {
+    "main": [
+      "me.pog5.leashmod.LeashPlayers"
+    ]
+  },
+  "mixins": [
+    "leashplayers.mixins.json"
+  ],
+
+  "depends": {
+    "fabricloader": ">=0.14.14",
+    "fabric-api": "*",
+    "minecraft": "~1.19.3",
+    "java": ">=17"
+  },
+  "suggests": {
+    "another-mod": "*"
+  }
+}

src/main/resources/leashplayers.mixins.json

@@ -0,0 +1,15 @@
+{
+    "minVersion": "0.8",
+    "compatibilityLevel": "JAVA_17",
+    "package": "me.pog5.leashmod.mixin",
+    "required": true,
+    "injectors": {
+        "defaultRequire": 1
+    },
+    "mixins": [
+        "MixinPlayerEntity",
+        "MixinServerPlayerEntity",
+        "MixinServerWorld",
+        "MixinTurtleEntity"
+    ]
+}