-- This program creates a tunnel liner to facilitate mining via 5 x 5 tunnels
-- Pastebin code = "yqYhZdbF"; Pastebin name is "MDC_Tunnel_Liner"

-- Place the turtle down on the right-forward end of the tunnel cut.
-- Place coal into Turtle slot #14 to assure adequate fueling
-- Place stone into Turtle slot #15 and #16 to assure adequate placement resources
-- This program begins by asking you how many two-block sections you want to cut

local function mv_fwd() -- This function moves the turtle forward one block
	if turtle.detect() then turtle.dig(); turtle.forward() else turtle.forward() end
	end

local function mv_up() -- This function moves the turtle up one block
	if turtle.detectUp() then turtle.digUp(); turtle.up() else turtle.up() end
	end

local function mv_dwn() -- This function moves the turtle down one block
	if turtle.detectDown() then turtle.digDown(); turtle.down() else turtle.down() end
	end

local function sel_slot() -- This function selects the active slot for placing blocks
	turtle.select(15)
	if turtle.getItemCount() < 3 then turtle.select(16) end
	end

local function place_fwd() -- This function places a block if none is present in front of the turtle
	if not turtle.detect() then sel_slot(); turtle.place() end -- check forward and place
	end

local function place_up()
	if not turtle.detectUp() then sel_slot(); turtle.placeUp() end -- check up and place
	end

local function place_dwn()
	if not turtle.detectDown() then sel_slot(); turtle.placeDown() end -- check down and place
	end

if turtle.getFuelLevel() < 200 then
    print( "Your fuel level is less than 200; refueling with 240." )
    turtle.select(14); turtle.refuel(3)
    end

text_input = { ... } -- Obtain the number of two-block sections desired

print ( "Checking Data Entered." )

if ( tonumber( text_input[1] ) < 1 ) then
    print( "Error: You must respond with a positive number." )
	return
    end

desired_sets = tonumber( text_input[1] )
desired_height = 5
desired_width = 5

while desired_sets > 0 do

	for iter1 = 1, desired_sets do -- Cut a hallway for the desired length while filling sides

		mv_fwd(); turtle.turnRight() -- Position turtle for initial cutting and placing

		for iter2 = 1, ( desired_height + 1 ) do -- Cut and place blocks up right side
			place_fwd(); mv_up()
		end

		turtle.turnLeft(); turtle.turnLeft(); -- Position turtle for cutting and placing on top of tunnel
		mv_dwn(); mv_dwn()

		for iter3 = 1, ( desired_width + 1 ) do -- Cut and place blocks across the top
			place_up(); mv_fwd()
		end

		turtle.turnLeft(); turtle.turnLeft(); mv_fwd(); mv_fwd(); turtle.turnLeft(); turtle.turnLeft();

		for iter4 = 1, desired_height do -- Cut and place blocks down the left side
			if not ( iter4 == desired_height ) then place_fwd(); mv_dwn() else place_fwd() end
		end

		turtle.turnRight(); mv_fwd(); turtle.turnLeft()  -- Position turtle for cutting and placing up the left side

		for iter5 = 1, ( desired_height + 1 ) do -- Cut and place blocks up the 2nd left side
			place_fwd(); mv_up()
		end

		turtle.turnRight(); turtle.turnRight(); mv_dwn(); mv_dwn()

		for iter6 = 1, ( desired_width + 1 ) do -- Cut and place blocks back across the top
			place_up(); mv_fwd()
		end

		turtle.turnLeft(); turtle.turnLeft(); mv_fwd(); mv_fwd(); turtle.turnLeft(); turtle.turnLeft();

		for iter4 = 1, desired_height do -- Cut and place blocks down the right side
			if not ( iter4 == desired_height ) then place_fwd(); mv_dwn() else place_fwd() end
		end


		turtle.turnLeft(); desired_sets = ( desired_sets - 1 )

	end

end

print( "The program has ended successfully." )