testThomasMiner

-- functions
function thomasTunneler(width, height, depth)

    if width < 1 or height < 1 or depth < 1 then
        return -- invalid parameter inputs
    end

    -- mine the first row
    mineRow(height)

    -- For every width
    for w = 1, width, 1 do
        -- for every depth
        for d = 2, depth, 1 do
            mineRow(height)
        end

        -- prepare for next slice
        if not w == width then
            prepareNextSlice(w, height)
        end

    end
end

function prepareNextSlice(currentWidth, height)
    turn(currentWidth) -- rotate 90 degree
    mineRow(height) -- mine the first row
    turn(currentWidth) -- rotate 90 degree again
end

function turn(currentWidth)
    if (currentWidth % 2) == 1 then
        turtle.turnRight()
    else
        turtle.turnLeft()
    end
end

function mineRow(height)
    turtle.dig("left") -- mine forward
    turtle.forward() -- move forward

    -- mine the row
    for h = 2, height, 1 do
        turtle.digUp("left")
        turtle.up()
    end

    -- move down to the ground again
    for h = 1, height, 1 do
        turtle.down()
    end
end
-- functions end

-- program
local width, height, depth = ...

thomasTunneler(width, height, depth)
-- program end