miner_v2.lua

function start()
    -- 1 = Height | 2 = Length | 3 = Rows | 4 = Rows before dump
    local input = get_input()
    local next_dump = input[4]
    local current_row = 1

    for r = 1, input[3] do
        term.clear()
        print("Digging line " .. r .. "...")
        dig_line(input[2], input[1])
        if r < input[3] then
            next_row(input[1])
        end
        if r == next_dump and r ~= input[3] then
            next_dump = next_dump + input[4]

            term.clear()
            print("Dumping storage...")
            reset_row(r)
            dump_storage()
            return_to_row(r)
        end

        current_row = r
    end
    reset_row(current_row - 1)
    dump_storage()
end

function dump_storage()
    turtle.turnLeft()
    turtle.turnLeft()
    for i = 1, 16 do
        turtle.select(i)
        turtle.drop()
    end
    turtle.turnLeft()
    turtle.turnLeft()
end

function return_to_row(rows)
    turtle.turnLeft()
    for r = 1, rows do
        while not turtle.forward() do
            turtle.dig()
        end
    end
    turtle.turnRight()
end

function reset_row(current_row)
    turtle.turnRight()
    for r = 1, current_row do
        while not turtle.forward() do
            turtle.dig()
        end
    end
    turtle.turnLeft()
end

function get_input()
    term.clear()
    io.write("Line starts on the next block from the turtle.")
    io.write("Chest needs to be behind the turtle.")
    io.write("The turtle mines from right to left.")
    io.write("Enter to continue...")
    io.read()
    term.clear()

    io.write("Enter height: ")
    local height = tonumber(io.read())
    term.clear()
    io.write("Enter length: ")
    local length = tonumber(io.read())
    term.clear()
    io.write("Enter rows: ")
    local rows = tonumber(io.read())
    term.clear()
    io.write("Enter storage dumped (rows): ")
    local rows_before_dump = tonumber(io.read())
    term.clear()

    return { height, length, rows, rows_before_dump }
end

function dig_line(length, height)
    -- Start next line.
    for l = 1, length do
        while not turtle.forward() do
            turtle.dig()
        end
        -- Dig up till max. height.
        for h = 1, height do
            while not turtle.up() do
                turtle.digUp()
            end
        end
        -- reset height.
        for h = 1, height do
            while not turtle.down() do
                turtle.digDown()
            end
        end
    end
    reset_length(length)
end

function reset_length(length)
    turtle.turnLeft()
    turtle.turnLeft()
    for l = 1, length do
        while not turtle.forward() do
            turtle.dig()
        end
    end
    turtle.turnLeft()
    turtle.turnLeft()
end

function next_row(height)
    turtle.turnLeft()
    while not turtle.forward() do
        turtle.dig()
    end
    -- Dig up till max. height.
    for h = 1, height do
        while not turtle.up() do
            turtle.digUp()
        end
    end
    -- reset height.
    for h = 1, height do
        while not turtle.down() do
            turtle.digDown()
        end
    end
    turtle.turnRight()
end


start()