ComputerCraft Floor Builder

--since I keep having to rewrite this code but can't find a way to pass and execute functions at runtime in lua, I will just make a template for it.
--this just repeats something in 3d, doing each row, layer, and column as efficiently as possible
--you need global variables that tell where the turtle's x y and z position is, usually relative to it's origin or home position.
--this assumes that it is starting in the bottom left corner. Can be adjusted.

--inventory functions
	--getnumber(id)                   --gets the number of items in the inventory. For most cases use anyleft instead as it doesn't usually need to perform an entire inventory update
	--getslot(id)                     --gets the first slot that the item can be found in
	--asignidorder(1, 2, 3, ...)      --assigns ids to each item in the order they occur in the inventory without knowing the actual slots they occur in. Spaces between items will stop the count
	--anyleft(id)					  --returns true if there are more than one of the item in the turtles inventory, else false (including if there are but it cannot identify them.)
	--updateinventory()				  --updates the inventory and tells where each item is located
		--sortinventory()
	--updateitem(id, number)          --tells the inventory that number of items was added
	--itemadded(morethanone)		  --tells the inventory that an item was added, but not what it was. argument is true if more than one item was added
	--fuel(id, id2, ...)              --asigns each item as a fuel useable by the turtle, in the order of priorty (reasigns priority if was used before)
	--notfuel(id) 					  --removes an item from the fuel list
	--refuel(level)					  --if level = 0 it will consume all fuels, otherwise consumes fuel until the turtles fuel level is up the the level specified
	--selectitem(id)				  --selects the first instance of item if not already selected. Does not update the stack or inventory unless it can not find any
	--selectempty()					  --selects an empty slot

function refuel()
	for i = 1, 16 do
		turtle.select(i)
		turtle.refuel()
	end
	slot = 1
	turtle.select(1)
end

function digforward(n)
	for i = 1, n do
		repeat
			if turtle.detect() then turtle.dig() end
		until turtle.forward()
	if direction == 1 then x = x + 1 end
	if direction == 2 then y = y + 1 end
	if direction == 3 then x = x - 1 end
	if direction == 4 then y = y - 1 end
	end

	--refueling and other functions should go here, as well as the up and down functions
end

function digdown(n)
	for i = 1, n do
		repeat
			if turtle.detectDown() then turtle.digDown() end
		until turtle.down()
		z = z - 1
	end
end

function digup(n)
	for i = 1, n do
		repeat
			if turtle.detectUp() then turtle.digUp() end
		until turtle.up()
		z = z + 1
	end
end

function turnright(n)
	for i = 1, n do
		turtle.turnRight()
		direction = direction + 1
		if direction > 4 then direction = 1 end
	end
end

function turnleft(n)
	for i = 1, n do
		turtle.turnLeft()
		direction = direction - 1
		if direction < 1 then direction = 4 end
	end
end

function turn(isright)
	if isright then turnright(1)
	else turnleft(1) end
end

function turncorner(isright)
	turn(isright)
	digforward(1)
	turn(isright)
end

function gotox(x)
	if gx > x then face(3)
	elseif gx < x then face(1)
	elseif gx == x then return end
	digforward(1)
	gotox(x)
end

function gotoy(y)
	if gy > y then face(4)
	elseif gy < y then face(2)
	elseif gy == y then return end
	digforward(1)
	gotoy(y)
end

function gotoz(z)
	if gz < z then digup(1) gotoz(z) end
	if gz > z then digdown(1) gotoz(z) end
end

function face(n)
	if direction == n then return end
	if direction < 3 then turnleft(1)
	else turnright(1) end
	face(n)
end

function iseven(n)
	if math.fmod(n, 2) == 0 then return true
	else return false end
end

function doblock()
	if turtle.detectDown() then turtle.digDown() end
	if turtle.getItemCount(slot) < 1 then
		slot = slot + 1
		if slot > 16 then print("Out of materials.\nRefill turtle and press Enter when ready.") io.read() slot = 1 end
		turtle.select(slot)
	end
	turtle.placeDown()
end

function dorow(fx)
	while true do
		doblock()
		if fx < 2 then break end
		digforward(1)
		fx = fx - 1
	end
end

function dolayer(fx, fy, isright)
	while true do
		dorow(fx)
		fy = fy - 1
		if fy < 2 then break end
		turncorner(isright)
		isright = not isright
	end
end

function fillfloor(fx, fy, fz)
	local isright = true
	while true do
		dolayer(fx, fy, isright)
		fz = fz - 1
		if fz < 2 then break end
		digup()
		turnright(2)
		if iseven(fy) then isright = not isright end
	end
end

function sethome()
	direction = 1
	x = 0
	y = 0
	z = 0
end


print("Enter forward dimension: ")
forward = tonumber(io.read())
print("Enter sidways dimension: ")
sideways = tonumber(io.read())
print("Fill turtle with fuel then press Enter.")
io.read()
refuel()
print("Fill full of building materials and press Enter when ready to begin.")
io.read()
sethome()
fillfloor(forward, sideways, 1)