tool_level_enchanting/init.lua

local path = minetest.get_modpath('tool_level_enchanting')
local S = minetest.get_translator("tool_level_enchanting")

tool_level_enchanting = {}

-- List of ores that work with fortune
tool_level_enchanting.registered_ores = {
    ['default:stone_with_coal'] = true,
    ['default:stone_with_copper'] = true,
    ['default:stone_with_diamond'] = true,
    ['default:stone_with_gold'] = true,
    ['default:stone_with_iron'] = true,
    ['default:stone_with_mese'] = true,
    ['default:stone_with_tin'] = true,
}

-- List of enchantments and max levels
tool_level_enchanting.registered_enchantments = {
    ['unbreaking'] = 10,
    ['efficiency'] = 5,
    ['silk_touch'] = 10,
    ['fortune'] = 10,
    ['auto_repair'] = 10,
    ['sharpness'] = 5
}

dofile(path .. '/enchants.lua')
level_divide_by = tonumber(minetest.settings:get("tool_level_enchanting_level_divide_by")) or 50

-- function to calculate levels
function tool_level_enchanting.get_level(uses)
    --local uses_number = tonumber(uses) or 0
    if uses < 50 then
        return 1
      else
        return math.floor((25 + math.sqrt(625 + 100 * uses))/level_divide_by)
    end
end

function tool_level_enchanting.create_description(name, uses, itemstack)
    local enchantment_string = 'Enchants:'
    if itemstack then 
        local itemmeta = itemstack:get_meta()
        local unbreaking  = tonumber(itemmeta:get_string("unbreaking")) or 0
        local fortune     = tonumber(itemmeta:get_string("fortune")) or 0
        local silk_touch  = tonumber(itemmeta:get_string("silk_touch")) or 0
        local auto_repair = tonumber(itemmeta:get_string("auto_repair")) or 0
        if unbreaking > 0 then
            enchantment_string = S(
                '@1\n    Unbreaking @2',
                enchantment_string,
                unbreaking
            )
        end
        if fortune > 0 then
            enchantment_string = S(
                '@1\n    Fortune @2',
                enchantment_string,
                fortune
            )
        end
        if silk_touch > 0 then
            enchantment_string = S(
                '@1\n    Silk Touch @2',
                enchantment_string,
                silk_touch
            )
        end
        if auto_repair > 0 then
            enchantment_string = S(
                '@1\n    Auto Repair @2',
                enchantment_string,
                auto_repair
            )
        end
    end
    local level = tool_level_enchanting.get_level(tonumber(uses) or 0)
    local newdesc = S(
        '@1\nLevel @2\nUses: @3\n@4',
        name,
        level,
        (type(uses) == "number" and uses or 0),
        enchantment_string
    )
    return newdesc
end

function tool_level_enchanting.on_use(itemstack, user, node, digparams)
    local itemmeta = itemstack:get_meta()
    local itemdef  = itemstack:get_definition()
    local itemdesc = itemdef.original_description or ""
    local dugnodes = tonumber(itemmeta:get_string("dug")) or 0
    local pname    = user:get_player_name()
    -- Enchant Variables
    local unbreaking  = tonumber(itemmeta:get_string("unbreaking")) or 0
    local fortune     = tonumber(itemmeta:get_string("fortune")) or 0
    local silk_touch  = tonumber(itemmeta:get_string("silk_touch")) or 0
    local auto_repair = tonumber(itemmeta:get_string("auto_repair")) or 0
    
    -- Make sure play exists
    if not pname then return itemstack end 

    -- 
    if digparams.wear > 0 then
        if tool_level_enchanting.fortune_use_double(fortune) then
            dugnodes = dugnodes + 1
        else
            dugnodes = dugnodes + 2
        end
        itemmeta:set_string("dug", dugnodes)
    end

    if itemstack:get_wear() > 60135 then --FIXME: Make this proc earlier?
        minetest.chat_send_player(user:get_player_name(), S("Your tool is about to break!"))
    end

    itemmeta:set_string("description", tool_level_enchanting.create_description(itemdesc, dugnodes, itemstack))
    --FIXME: Add Unbreaking here? idk
    if tool_level_enchanting.unbreaking_proc(unbreaking) then
        itemstack:add_wear(digparams.wear)
    end
    return itemstack
end

function tool_level_enchanting.add_tool(name)
    local desc = ItemStack(name):get_definition().description
    minetest.override_item(name, {
        original_description = desc,
        description = tool_level_enchanting.create_description(desc),
        after_use = tool_level_enchanting.on_use
    })
end

tool_level_enchanting.add_tool("default:pick_wood")
tool_level_enchanting.add_tool("default:pick_stone")
tool_level_enchanting.add_tool("default:pick_steel")
tool_level_enchanting.add_tool("default:pick_bronze")
tool_level_enchanting.add_tool("default:pick_mese")
tool_level_enchanting.add_tool("default:pick_diamond")