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src/main/java/pw/kaboom/extras/commands/CommandBroadcastRainbow.java

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+package pw.kaboom.extras.commands;
+
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import javax.annotation.Nonnull;
+
+public final class CommandBroadcastRainbow implements CommandExecutor {
+    private static final MiniMessage MINI_MESSAGE = MiniMessage.miniMessage();
+
+    public boolean onCommand(final @Nonnull CommandSender sender,
+                             final @Nonnull Command command,
+                             final @Nonnull String label,
+                             final String[] args) {
+        if (args.length == 0) {
+            sender.sendMessage(Component
+                    .text("Usage: /" + label + " <message ..>",
+                            NamedTextColor.RED));
+            return true;
+        }
+        final String strippedTags = MINI_MESSAGE.stripTags(String.join(" ", args));
+        final Component component = MINI_MESSAGE.deserialize("<rainbow>" + strippedTags);
+        Bukkit.getServer().broadcast(component);
+        return true;
+    }
+}