Implemented the /expel command

src/main/java/dev/plex/extras/command/ExpelCommand.java

@@ -0,0 +1,100 @@
+package dev.plex.extras.command;
+
+import dev.plex.command.PlexCommand;
+import dev.plex.command.annotation.CommandParameters;
+import dev.plex.command.annotation.CommandPermissions;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import org.bukkit.Location;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.util.Vector;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+@CommandParameters(name = "expel", description = "Pushes away nearby players", usage = "/expel <radius> <strength>", aliases = "push")
+@CommandPermissions(permission = "plex.tfmextras.expel")
+public class ExpelCommand extends PlexCommand
+{
+    @Override
+    protected Component execute(@NotNull CommandSender sender, @Nullable Player player, @NotNull String[] args)
+    {
+        double radius = 20.0;
+        double strength = 5.0;
+
+        if (args.length > 0)
+        {
+            try
+            {
+                radius = Double.parseDouble(args[0]);
+            }
+            catch (NumberFormatException ignored)
+            {
+                return usage();
+            }
+        }
+
+        if (args.length > 1)
+        {
+            try
+            {
+                strength = Double.parseDouble(args[1]);
+            }
+            catch (NumberFormatException ignored)
+            {
+                return usage();
+            }
+        }
+
+        List<String> pushedPlayers = new ArrayList<>();
+
+        final Vector senderPos = player.getLocation().toVector();
+        final List<Player> players = player.getWorld().getPlayers();
+
+        for (final Player target : players)
+        {
+            if (target.equals(player))
+            {
+                continue;
+            }
+
+            final Location targetPos = target.getLocation();
+            final Vector targetPosVec = targetPos.toVector();
+
+            if (targetPosVec.distanceSquared(senderPos) < (radius * radius))
+            {
+                target.setFlying(false);
+
+                target.getWorld().createExplosion(targetPos, 0.0f, false);
+                target.setVelocity(targetPosVec.subtract(senderPos).normalize().multiply(strength));
+
+                pushedPlayers.add(target.getName());
+            }
+        }
+
+        if (!pushedPlayers.isEmpty())
+        {
+            return MiniMessage.miniMessage().deserialize("<gray>Pushed away players: <white><em>" + String.join("<reset><gray>, <white><em>", pushedPlayers));
+        }
+
+        return null;
+    }
+
+    @Override
+    public @NotNull List<String> smartTabComplete(@NotNull CommandSender sender, @NotNull String alias, @NotNull String[] args)
+    {
+        if (args.length == 1)
+        {
+            return Collections.singletonList("<radius>");
+        }
+        else if (args.length == 2)
+        {
+            return Collections.singletonList("<strength>");
+        }
+        return Collections.emptyList();
+    }
+}