First version

.gitignore

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+.gradle/
+target/

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>

build.sh

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+#!/bin/bash
+mvn package

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>pw.kaboom</groupId>
+	<artifactId>Weapons</artifactId>
+	<version>1.0.0</version>
+
+	<properties>
+		<maven.compiler.source>7</maven.compiler.source>
+		<maven.compiler.target>7</maven.compiler.target>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>com.destroystokyo.paper</groupId>
+			<artifactId>paper-api</artifactId>
+			<version>1.12.2-R0.1-SNAPSHOT</version>
+			<scope>provided</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.spigotmc</groupId>
+			<artifactId>spigot</artifactId>
+			<version>1.12.2-R0.1-SNAPSHOT</version>
+		</dependency>
+	</dependencies>
+
+	<repositories>
+		<repository>
+			<id>destroystokyo-repo</id>
+			<url>https://repo.destroystokyo.com/repository/maven-public/</url>
+		</repository>
+	</repositories>
+
+	<build>
+		<finalName>${project.artifactId}</finalName>
+		<resources>
+			<resource>
+				<directory>src/main/resources</directory>
+				<filtering>true</filtering>
+			</resource>
+		</resources>
+	</build>
+</project>
+

src/main/java/pw/kaboom/weapons/Main.java

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+package pw.kaboom.weapons;
+
+import java.util.Set;
+
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.Sound;
+import org.bukkit.World;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.entity.Projectile;
+
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.player.PlayerInteractEvent;
+
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+
+import org.bukkit.material.MaterialData;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+
+public class Main extends JavaPlugin implements Listener {
+	public void onEnable() {
+		this.getCommand("weapons").setExecutor(new CommandWeapons());
+		this.getServer().getPluginManager().registerEvents(this, this);
+	}
+ 
+	@EventHandler
+	public void onInventoryClick(InventoryClickEvent event) {
+		Player player = (Player) event.getWhoClicked();
+		ItemStack clickedItem = event.getCurrentItem();
+		String name = clickedItem.getItemMeta().getDisplayName().toLowerCase();
+
+		if (event.getInventory().getName() == "Weapons") {
+			if (clickedItem != null) {
+				player.getInventory().addItem(clickedItem);
+				player.closeInventory();
+				player.sendMessage("You have received the " + name + "!");
+			}
+		}
+	}
+
+	@EventHandler
+	void onPlayerInteract(PlayerInteractEvent event) {
+		Action action = event.getAction();
+		Player player = event.getPlayer();
+		boolean hasName = event.getItem().getItemMeta().hasDisplayName();
+		Material item = event.getMaterial();
+		String name = event.getItem().getItemMeta().getDisplayName();
+		Location lookPos = player.getTargetBlock((Set<Material>) null, 100).getLocation();
+		Location playerPos = player.getLocation();
+		World world = player.getLocation().getWorld();
+
+		if (hasName == true) {
+			if (action == Action.LEFT_CLICK_AIR || action == Action.LEFT_CLICK_BLOCK) {
+				if (item == Material.ANVIL && name == "Anvil Dropper") {
+					for (int x = -2; x <= 2; x += 1) {
+						for (int z = -2; z <= 2; z += 1) {
+							Location blockPos = new Location(world, playerPos.getX() - x, playerPos.getY(), playerPos.getZ() - z);
+							MaterialData blockMaterial = new MaterialData(Material.ANVIL);
+							world.spawnFallingBlock(blockPos, blockMaterial);
+						}
+					}
+					event.setCancelled(true);
+				} else if (item == Material.STICK && name == "Lightning Stick") {
+					world.strikeLightning(lookPos);
+					event.setCancelled(true);
+				} else if (item == Material.BLAZE_ROD && name == "Nuker") {
+					Projectile projectile = (Projectile) world.spawnEntity(playerPos, EntityType.FIREBALL);
+					projectile.setShooter(player);
+					projectile.setVelocity(playerPos.getDirection().multiply(6));
+					world.createExplosion(lookPos, 6);
+					world.playSound(playerPos, Sound.ENTITY_GHAST_SHOOT, 0.9F, 1.5F);
+					world.playSound(playerPos, Sound.ENTITY_BAT_TAKEOFF, 0.8F, 2.0F);
+					event.setCancelled(true);
+				} else if (item == Material.IRON_BARDING && name == "Sniper") {
+					Location projectilePos = new Location(world, playerPos.getX(), playerPos.getY() + 1.5, playerPos.getZ());
+					Projectile projectile = (Projectile) world.spawnEntity(projectilePos, EntityType.SNOWBALL);
+					projectile.setShooter(player);
+					projectile.setVelocity(playerPos.getDirection().multiply(6));
+					world.playSound(playerPos, Sound.BLOCK_PISTON_CONTRACT, 1.0F, 63.0F);
+					event.setCancelled(true);
+				}
+			} else if (action == Action.RIGHT_CLICK_AIR || action == Action.RIGHT_CLICK_BLOCK) {
+				if (item == Material.IRON_BARDING && name == "Sniper") {
+					if (player.hasPotionEffect(PotionEffectType.SLOW)) {
+						player.removePotionEffect(PotionEffectType.SLOW);
+					} else {
+						PotionEffect effect = new PotionEffect(PotionEffectType.SLOW, 90000, 7);
+						player.addPotionEffect(effect);
+					}
+					event.setCancelled(true);
+				}
+			}
+		}
+	}
+}
+
+class CommandWeapons implements CommandExecutor {
+	private void addWeapon(Inventory inventory, Material material, String name) {
+		ItemStack item = new ItemStack​(material, 1);
+		ItemMeta itemMeta = item.getItemMeta();
+		itemMeta.setDisplayName(name);
+		item.setItemMeta(itemMeta);
+		inventory.addItem(item);
+	}
+
+	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
+		Player player = (Player)sender;
+		Inventory inventory = Bukkit.createInventory(null, 9, "Weapons");
+		addWeapon(inventory, Material.ANVIL, "Anvil Dropper");
+		addWeapon(inventory, Material.STICK, "Lightning Stick");
+		addWeapon(inventory, Material.BLAZE_ROD, "Nuker");
+		addWeapon(inventory, Material.IRON_BARDING, "Sniper");
+		player.openInventory(inventory);
+		return true;
+	}
+}

src/main/resources/plugin.yml

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+name: Weapons
+main: pw.kaboom.weapons.Main
+description: Plugin that adds weapons.
+version: ${project.version}
+
+commands:
+   weapons:
+      aliases: weapon
+      description: Gives you a weapon
+      usage: /weapons
+      permission: weapons.command