miner.lua

function Done()
    print("Finished mining!")
end

function TurnBack()
    print("Turning back and going up...")
    turtle.turnRight()
    turtle.turnRight()
    if turtle.detectUp() then
        turtle.digUp()
    end
    while not turtle.up() do
        turtle.digUp()
    end
end

function DigLine(lineLength,lineHeight,layers)
    while CheckStorageFull() do
        DropItems()
    end
    print("Digging layer...")
    for e=1,lineHeight do
        for i=1,lineLength do
            while turtle.detect() do
                turtle.dig()
            end
            while not turtle.forward() do
                turtle.dig()
            end
        end
        TurnBack()
    end
end

function ResetHeight(height)
    print("Resetting height...")
    for i=1,height do
        turtle.down()
    end
end

function NextLine()
    print("Preparing for next layer...")
    turtle.turnLeft()
    if turtle.detect() then
        turtle.dig()
    end
    while not turtle.forward() do
        turtle.dig()
    end
    turtle.turnRight()
end

function CheckStorageFull()
    for i=2,16 do
        if turtle.getItemCount(i) > 0 then
            return true
        end
        return false
    end
end

function DropItems()
    for i=2,16 do
        turtle.select(i)
        turtle.dropDown()
    end
end

function Start()
    print("Miner started.")
    local area = RequestInput()
    for i=1,area[3] do
        DigLine(area[1],area[2], area[3])
        ResetHeight(area[2])
        NextLine()
    end
    Done()
end

function RequestInput()
    io.write("Enter length:")
    local length = io.read()
    io.write("Enter height:")
    local height = io.read()
    io.write("Enter how many rows should be mined:")
    local layers = io.read()

    local area = {tonumber(length),tonumber(height),tonumber(layers)}

    return area
end

Start()