SimpleTurtleMiner

function Refuel()
    textutils.slowPrint("Refueling...")
    local i_lavaFuel = 1000
    local i_coalFuel = 80
    local i_coalBlockFuel = 800

    local travelable = 0

    for i = 1,16 do
        turtle.select(i)
        if turtle.refuel(0) then
            local item = turtle.getItemDetail()
            if item.name == "minecraft:lava_bucket" then
                travelable = travelable + (item.count * i_lavaFuel)
            elseif item.name == "minecraft:coal" or item.name == "minecraft:charcoal" then
                travelable = travelable + (item.count * i_coalFuel)
            elseif item.name == "minecraft:coal_block" or item.name == "minecraft:charcoal_block" then
                travelable = travelable + (item.count * i_coalBlockFuel)
            else
                travelable = travelable + 1
            end
        end
        turtle.refuel()
    end
turtle.select(1)
print("Refueled for: " .. travelable)
end

function CalculateFuelUsage(required)
    if turtle.getFuelLevel() >= required then
        textutils.slowPrint("Mining...\nPlease wait!")
        return true
    end
    print("Need " .. (required-turtle.getFuelLevel()) .. "fuel!")
    return false
end

function MineFORWARD_Move()
    while turtle.detect() do
        turtle.dig()
    end
    turtle.forward()
end

function MineUP()
    while turtle.detectUp() do
        turtle.digUp()
    end
end

function MineLEFT_Move()
    turtle.turnLeft()
    MineUF_Move()
end

function MineRIGHT_Move()
    turtle.turnRight()
    MineUF_Move()
end

function MineUF_Move()
    MineUP()
    MineFORWARD_Move()
end

function SimpleMineL(forward, sideways)
    Refuel()
    if CalculateFuelUsage(((2 * 3) + (2 * forward) * sideways) + 3 * sideways) then
        turtle.turnLeft()
        for i=1,sideways do
            for j=1,3 do
                MineUF_Move()
            end
            for k=1,2 do
                turtle.turnRight()
                for l=1,forward do
                    MineUF_Move()
                end
                turtle.turnRight()
                for m=1,3 do
                MineUF_Move()
                end
            end
        end
        turtle.turnLeft()
        turtle.turnLeft()
        for i=1,(sideways * 3) do
            turtle.forward()
        end
        turtle.turnLeft()
    else
        print("Not enough fuel in inventory!")
    end
end

function SimpleMineR(forward, sideways)
    Refuel()
    if CalculateFuelUsage(turtle.getFuelLevel(),((2 * 3) + (2 * forward) * sideways) + 3 * sideways) then
        turtle.turnRight()
        for i=1,sideways do
            for j=1,3 do
                MineUF_Move()
            end
            for k=1,2 do
                turtle.turnLeft()
                for l=1,forward do
                    MineUF_Move()
                end
                turtle.turnLeft()
                for m=1,3 do
                MineUF_Move()
                end
            end
        end
        turtle.turnRight()
        turtle.turnRight()
        for i=1,(sideways * 3) do
            turtle.forward()
        end
        turtle.turnRight()
    else
        print("Not enough fuel in inventory!")
    end
end

print("forward | :")
f = read()
print("sideways - :")
s = read()
SimpleMineL(f,s)
SimpleMineR(f,s)