14-door Villager Housing

--A simple NPC Village expanding program. It requires a crafty turtle with the following in its inventory:
--Slot 1: a full stack (64) of building materials (cobblestone, etc)
--Slot 2: a half stack (32) of the same building materials as Slot 1
--*Note* not all of the materials will be used, but full and half stacks are easier to work with in my opinion.
--My coding skills are relatively weak after several years away from it, and having a full stack in Slot 2 will
--cause problems, so please stick to a half stack. All other inventory slots may have excess.
--Slot 4: 9 torches
--Slots 5, 6, 9, 10, 13, and 14: 14 wood planks (used to craft the doors)
--Slot 16: adequate coal or charcoal (3-5 is sufficient)
--The house built will be 11x3x5 with 14 doors with adequate interior and exterior lighting to prevent monster
--spawns. This program currently cannot account for obstructions, so ensure the area being used for construction
--is clear out to 15x5x9 to include tall grass and flowers, which prevent a turtle from moving. The turtle should be
--placed on the ground with a chest directly behind it (similar to the excavate setup). The lower-left block of the
--house's short face will be the block directly in front of the turtle.

local step = 1 --used in buildFrame() to track construction stages

--basic refueling function
function fuel()
  if turtle.getFuelLevel() < 10 then
	turtle.select(16)
	turtle.refuel(1)
  end
end

--assorted functions to shorten/tidy my actual code
function left(reps)
  for x=1,reps do
	turtle.turnLeft()
  end
end

function right(reps)
  for x=1,reps do
	turtle.turnRight()
  end
end

function back(reps)
  for x=1,reps do
	fuel()
	turtle.back()
  end
end

function forward(reps)
  for x=1,reps do
	fuel()
	turtle.forward()
  end
end

function up(reps)
  for x=1,reps do
	fuel()
	turtle.up()
  end
end

function down(reps)
  for x=1,reps do
	fuel()
	turtle.down()
  end
end

function pDown()
  turtle.placeDown()
end

function pUp()
  turtle.placeUp()
end

function place()
  turtle.place()
end

function torch()
  turtle.select(4)
  turtle.place()
end

function wTorch()
  right(1)
  turtle.select(4)
  place()
  left(1)
end

function dTorch()
  turtle.select(4)
  pDown()
end

function corner()
  forward(4)
  right(1)
  forward(4)
end

--used to build the walls/door frames of the house
function buildFrame()
  turtle.select(1)
  if step == 1 then
	pUp()
	pDown()
	back(1)
	step = 2
  else
	pUp()
	place()
	back(1)
	step = 1
  end
end

--used to craft and place the doors
function buildDoor()
  turtle.select(1)
  turtle.craft()
  place()
  right(1)
  forward(2)
  left(1)
end

--used in conjunction with buildDoor() to navigate the corners of the house
function orientDoor()
  forward(2)
  left(1)
end

--Turtle moves away from the chest and orients itself for the construction
forward(1)
up(1)
right(2)

--Turtle builds the house frame
for x=1,2 do
  for y=1,10 do
	buildFrame()
  end
  right(1)
  for z=1,4 do
	buildFrame()
  end
  right(1)
end

--Turtle places interior torch and prepares its inventory for crafting by depositing all additional building materials
back(5)
left(1)
down(1)
torch()
left(1)
back(7)
left(1)
turtle.select(1)
turtle.drop()
turtle.select(2)
turtle.drop()
turtle.select(4)
turtle.drop()
turtle.select(16)

--Turtle ensures it has enough fuel for the door placement since it must have an empty inventory for turtle.craft() to return "true" and moves into position
if turtle.getFuelLevel() < 40 then
  turtle.refuel(1)
end
turtle.drop()
right(1)
forward(1)

--Turtle crafts and places the doors
for x=1,2 do
  for y=1,2 do
	buildDoor()
  end
  orientDoor()
  for z=1,5 do
	buildDoor()
  end
  orientDoor()
end

--Turtle retrieves its supplies to finish house construction
back(1)
left(1)
turtle.select(1)
turtle.suck()
turtle.select(4)
turtle.suck()
turtle.select(16)
turtle.suck()
right(1)
forward(1)
up(3)
forward(2)

--Turtle builds the roof
for x=1,3 do
  for y=1,8 do
	turtle.select(1)
	pDown()
	forward(1)
  end
  turtle.select(1)
  pDown()
  if step == 1 then
	right(1)
	forward(1)
	right(1)
	step = 2
  else
	left(1)
	forward(1)
	left(1)
	step = 1
  end
end

--Turtle places all exterior torches
forward(1)
right(1)
back(2)
down(1)
torch()
left(1)
forward(6)
wTorch()
corner()
wTorch()
corner()
wTorch()
forward(6)
wTorch()
corner()
right(1)
torch()
up(2)
forward(4)
dTorch()
forward(6)
dTorch()
forward(4)
down(4)