ItemUtils.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using Terraria;
using Terraria.ModLoader;

namespace Loot.Api.Ext
{
    public static class ItemUtils
    {
        public static bool IsModifierRollableItem(this Item item) => item.maxStack == 1 && item.IsWeapon() || item.IsAccessory() || item.IsArmor();
        public static bool IsWeapon(this Item item) => item.damage > 0;
        public static bool IsAccessory(this Item item) => item.accessory && !item.vanity;
        public static bool IsArmor(this Item item) => (item.headSlot >= 0 || item.bodySlot >= 0 || item.legSlot >= 0) && !item.vanity;

        public static IEnumerable<T> GetDistinctModItems<T>(this Item[] inventory) where T : ModItem
            => inventory
                .Where(x => !x.IsAir
                            && x.modItem is T)
                .GroupBy(x => x.type)
                .Select(g => (T)g.First().modItem);

        public static int CountModItemStack<T>(this Item[] inventory, bool includeMouseItem = false) where T : ModItem
            => CountItemStack(inventory, includeMouseItem, item => item.modItem is T);

        public static int CountItemStack(this Item[] inventory, int type, bool includeMouseItem = false)
            => CountItemStack(inventory, includeMouseItem, item => item.type == type);

        public static int CountItemStack(this Item[] inventory, bool includeMouseItem, Func<Item, bool> predicate)
        {
            int size = includeMouseItem ? 59 : 58;
            return Main.LocalPlayer.inventory.Take(size)
                .Where(predicate)
                .Select(x => x.stack)
                .Sum();
        }
    }
}