domainexpansion.lua

DESIGNATED_BLOCK = "minecraft:stone"
DESIGNATED_FUEL = "minecraft:coal"
INVENTORY_SIZE = 16

local function log(message)
    print(">-- "..message)
end

local function get_slot_with_item_in_inventory(item)
    for i = 1, INVENTORY_SIZE, 1 do
        if turtle.getItemDetail(i) then
            if turtle.getItemDetail().name == item then
                return i
            end
        end
    end
    log("Couldn't find item with name: "..item)
    return nil
end

local function wait_for_item_in_inventory_and_get_slot(item)
    while true do
        for i = 1, INVENTORY_SIZE, 1 do
            if turtle.getItemDetail(i) then
                if turtle.getItemDetail().name == item then
                    return i
                end
            end
        end
        os.sleep(0.5)
        log("Cannot find item with name: "..item)
    end
end

local function placeBlock()
    if turtle.getItemDetail() then
        if turtle.getItemDetail().name ~= DESIGNATED_BLOCK then
            turtle.select(wait_for_item_in_inventory_and_get_slot(DESIGNATED_BLOCK))
        end
    else
        turtle.select(wait_for_item_in_inventory_and_get_slot(DESIGNATED_BLOCK))
    end

    if not turtle.compareDown() then
        turtle.digDown()
        turtle.placeDown()
    end
end

local function proceedForward()
    if turtle.detect() then
        turtle.dig()
    end
    turtle.forward()
end

local function proceedLeft()
    placeBlock()
    turtle.turnLeft()
    if turtle.detect() then
        turtle.dig()
    end
    turtle.forward()
    turtle.turnLeft()
end

local function proceedRight()
    placeBlock()
    turtle.turnRight()
    if turtle.detect() then
        turtle.dig()
    end
    turtle.forward()
    turtle.turnRight()
end

local function refuel(wait)
    repeat
        for i = 1, INVENTORY_SIZE, 1 do
            turtle.select(i)
            if turtle.refuel() then
                log("Succesfully refueled")
                return
            end
        end
        if wait then
            log("Could find fuel, waiting for fuel in inventory")
            os.sleep(0.5)
        else
            log("Could find fuel, proceeding...")
        end
    until not wait
end

--Main

local function main()
    term.write("Width: ")
    local target_width = io.read()

    term.write("Height: ")
    local target_height = io.read()

    print(target_width, target_height)

    for width = 1, target_width, 1 do
        for height = 1, target_height - 1, 1 do
            if turtle.getFuelLevel() < 100 then
                log("Low on fuel")
                refuel(false)
            elseif turtle.getFuelLevel() < 10 then
                log("Fuel level critical, waiting for fuel")
                refuel(true)
            end
            placeBlock()
            proceedForward()
            log(width.." "..height)
        end
        if width % 2 == 1 then
            proceedRight()
        else
            proceedLeft()
        end
    end
end


main()