TF-EssentialsX/Essentials/src/com/earth2me/essentials/commands/Commandsell.java

package com.earth2me.essentials.commands;

import org.bukkit.Server;
import com.earth2me.essentials.Essentials;
import com.earth2me.essentials.InventoryWorkaround;
import com.earth2me.essentials.ItemDb;
import com.earth2me.essentials.User;
import org.bukkit.Material;
import org.bukkit.inventory.ItemStack;


public class Commandsell extends EssentialsCommand
{
	public Commandsell()
	{
		super("sell");
	}

	@Override
	public void run(Server server, Essentials parent, User user, String commandLabel, String[] args) throws Exception
	{
		if (args.length < 1) {
			user.sendMessage("§cUsage: /sell <itemname> [amount]");
			return;
		}
		ItemStack is = ItemDb.get(args[0]);
		if(is.getType() == Material.AIR) {
			throw new Exception("You really tried to sell Air? Put an item in your hand.");
		}

		int id = is.getTypeId();
		int amount = 0;
		if (args.length > 1) {
			amount = Integer.parseInt(args[0].replaceAll("[^0-9]", ""));
		}
		double worth = Essentials.getWorth().getPrice(is);
		boolean stack = args.length > 1 && args[1].endsWith("s");
		boolean requireStack = parent.getConfiguration().getBoolean("trade-in-stacks-" + id, false);

		if (worth < 1) {
			throw new Exception("That item cannot be sold to the server.");
		}
		if (requireStack && !stack) {
			throw new Exception("Item must be traded in stacks. A quantity of 2s would be two stacks, etc.");
		}

		int max = 0;
		for (ItemStack s : user.getInventory().getContents())
		{
			if (s.getTypeId() != is.getTypeId()) {
				continue;
			}
			if (s.getDurability() != is.getDurability()) {
				continue;
			}
			max += s.getAmount();
		}

		if (stack) {
			amount *= 64;
		}
		if (amount < 1) {
			amount += max;
		}

		if (requireStack)
		{
			amount -= amount % 64;
		}
		
		if (amount > max || amount < 1)
		{
			user.sendMessage("§cYou do not have enough of that item to sell.");
			user.sendMessage("§7If you meant to sell all of your items of that type, use /sell without parameters.");
			user.sendMessage("§7/sell -1 will sell all but one item, etc.");
			return;
		}

		user.charge(this);
		InventoryWorkaround.removeItem(user.getInventory(), true, new ItemStack(is.getType(), amount, is.getDurability()));
		user.updateInventory();
		user.giveMoney(worth * amount);
		user.sendMessage("§7Sold for §c$" + (worth * amount) + "§7 (" + amount + " items at $" + worth + " each)");
	}
}