Grief Program by Taking1n1

-- GRIEF PROGRAM
-- by Taking1n1

-- // Slot definitions \\
-- 1: TNT blocks
-- 2: Redstone
-- 3: Any block, only used if there are holes

-- Goes forward and finds the building
steps = 0
goDown = 0
while true do

    turtle.forward()
    steps = steps + 1

    if not turtle.detectDown() then -- If there are no blocks below
        turtle.select(3)
        turtle.placeDown()
        turtle.select(1)
    end

    if turtle.detect() then
        break
    end

end

-- Found the building, prepare
turtle.back()
turtle.select(1)

-- Sets up TNT
while true do

    turtle.forward()

    if turtle.detect() then -- If there is a block in front of you

        turtle.back()
        turtle.place()

        if turtle.detectUp() then -- If there is a block above us
            break
        end

        turtle.up()
        goDown = goDown + 1

    else
        turtle.back()
        break
    end

    if turtle.getItemCount(1) == 0 then  -- If we've ran out of TNT
        break
    end

end

-- Goes back down
while goDown ~= 0 do
    turtle.down()
    goDown = goDown - 1
end

-- Offset the steps
steps = steps - 1

-- Gos back and places redstone along
turtle.select(2)
while steps ~= 0 do

    turtle.back()
    steps = steps - 1
    turtle.place()

    if turtle.getItemCount(2) == 0 then  -- If we've ran out of redstone
        redstone.setOutput("front", true)
        redstone.setOutput("front", false)
    end

end

-- Detonates the bomb
redstone.setOutput("front", true)
sleep(1)
redstone.setOutput("front", false)

-- We are finished
print("The deed is done.")