Help with Clean-up of code for a little turtle OS with building templates

choice=fs.list('')
newTable=fs.list('')
hidden={'startup','rom','KeyNumb'}
function hideValues(array,hidden)
for i,v in ipairs(array) do
  for i2,v2 in ipairs(hidden) do
   if v==v2 then
	table.remove(array, i)
	return hideValues(array,hidden)
   end
  end
end
end
function lineClear()
x,y=term.getCursorPos()
term.clearLine()
term.setCursorPos(1,y)
end
function printCentered(str)
x,y=term.getSize()
x2,y2=term.getCursorPos()
newX=math.ceil(x/2)-math.ceil(string.len(str)/2)
term.setCursorPos(newX,y2)
print(str)
end
function replaceDelim(str, delim)
result=''
for i in string.gmatch(str, '%a+') do
  result=result..i..delim
end
return result
end
function spacifyTable(array)
for i,v in ipairs(array) do
  array[i]=replaceDelim(v,' ')
end
end
function getArraySize(array)
count=0
for _ in ipairs(array) do
  count=count+1
end
return count
end
function multipleChoice(choices, initial)
size=getArraySize(choices)
if not initial then
  sel=1
else
  sel=initial
end
while true do
  header()
  for i,v in ipairs(choices) do
   if i==sel then
	printCentered('[ '..v..']')
   else
	printCentered('  '..v..' ')
   end
  end
  event,key=os.pullEvent('key')
  if (key==208 or key==31) and sel<=size then sel=sel+1 end
  if (key==208 or key==31) and sel==size+1 then sel=1 end
  if (key==200 or key==17) and sel>0 then sel=sel-1 end
  if (key==200 or key==17) and sel==0 then sel=size end
  if key==28 or key==57 then break end
  sleep(0.01)
end
return sel
end
function header()
term.clear()
term.setCursorPos(1,1)
print("HimCo Industries' Turtley 2.0")
print()
printCentered('Select a template:')
print()
end
hideValues(choice,hidden)
spacifyTable(choice)
file=multipleChoice(choice)
hideValues(newTable,hidden)
shell.run(newTable[file])

--args={...}
--local width=tonumber(args[1])
--local height=tonumber(args[2])
term.clear()
term.setCursorPos(1,1)
function lineClear()
local x,y=term.getCursorPos()
term.setCursorPos(1,y)
term.clearLine()
end
function dichotomy(a,B)/>/>/>
sel=true
while true do
  if sel then
   write("--> "..a.."	 "..B)/>/>/>
  else
   write("	"..a.." --> "..B)/>/>/>
  end
  event,key=os.pullEvent()
  if event=="key" and key==203 then sel=not sel end
  if event=="key" and key==205 then sel=not sel end
  if event=="key" and key==28 then break end
  sleep(0.01)
  lineClear()
end
print()
return sel
end
function numbersOnly(pre)
local x,y=term.getCursorPos()
if pre then write(pre) end
local num=read()
if not tonumber(num) then
  term.setCursorPos(x,y)
  term.clearLine()
  write('Please insert a number only')
  sleep(1.5)
  term.setCursorPos(x,y)
  term.clearLine()
  return numbersOnly(pre)
end
return tonumber(num)
end
function returnToBase(height)
turtle.turnRight()
turtle.turnRight()
turtle.forward()
for i=1, height+1 do
  turtle.down()
end
end
function getDimensions()
term.clear()
term.setCursorPos(1,1)
print('Give the values for the dimensions of the tower.')
print()
width=numbersOnly('Please give a value for the width: ')
height=numbersOnly('Please give a value for the height: ')
if width<0 or height<0 or height>256 then
  print()
  print('Check your numbers. The dimensions must be greater than 0, and the height cannot be greater than world heigh. (256)')
  sleep(2)
  return getDimensions()
end
return width,height
end
function tower(width, height)
for i1=1, height do
  turtle.up()
  for i2=1, 4 do
   for i3=1, width-1 do
	turtle.forward()
	if not selectResource() then
	 print()
	 print('There are no available resources.')
	 print('Please add more to continue.')
	 while not selectResource() do
	  sleep(3)
	 end
	 term.clear()
	 term.setCursorPos(1,1)
	 print('Construction will continue')
	end
	turtle.placeDown()
   end
   turtle.turnRight()
  end
end
print('Build Complete')
if toBase then
  returnToBase(height)
end
end
function calculateBlocks(width, height)
local shell=(width^2*height)-((width-2)^2*height)
local stacks=(shell-(shell%64))/64
local extra=shell%64

term.clear()
term.setCursorPos(1,1)
print('Would you like the turtle to return to the tower base when finished?')
if dichotomy('Yes','No') then
  toBase=true
else toBase=false
end
term.clear()
term.setCursorPos(1,1)

print('You will need 64x'..tostring(stacks)..'+'..tostring(extra)..' blocks for this tower.')
print()
print('When the turtle has depleted one slot, it will select the next available resource regardless of the type.')
print()
print('Add the required amount to the turtle, then select continue to proceed')
if dichotomy('Continue','Quit') then
  print()
  print('Construction will begin')
  sleep(1.5)
  term.clear()
  term.setCursorPos(1,1)
else
  os.reboot()
end

if countResources()<shell then
  term.clear()
  term.setCursorPos(1,1)
  print('You still do not have enough resources to complete this build.')
  print()
  print('If the turtle runs out, it will stall until more are added.')
  print()
  print('Continue anyway?')
  if dichotomy('Continue','Quit') then
   print('Construction will begin')
   sleep(1.5)
   term.clear()
   term.setCursorPos(1,1)
  else
   os.reboot()
  end
end
return shell
end
function countResources()
local count=0
for i4=1, 16 do
  count=count+turtle.getItemCount(i4)
end
return count
end
function selectResource()
for i5=1, 16 do
  if turtle.getItemCount(i5)>0 then
   turtle.select(i5)
   return true
  end
end
return false
end
width,height=getDimensions()
calculateBlocks(width,height)
tower(width,height)
os.reboot()

diggingMode=false
function lineClear()
x,y=term.getCursorPos()
term.clearLine()
term.setCursorPos(1,y)
end
function dichotomy(a,B)/>/>/>
sel=true
while true do
  if sel then
   write("--> "..a.."	 "..B)/>/>/>
  else
   write("	"..a.." --> "..B)/>/>/>
  end
  event,key=os.pullEvent()
  if event=="key" and key==203 then sel=not sel end
  if event=="key" and key==205 then sel=not sel end
  if event=="key" and key==28 then break end
  sleep(0.01)
  lineClear()
end
print()
return sel
end
function enableDiggingMode()
print('Do you wish to enable digging mode?')
print('If you do so, the turtle will clear a 3x3x3 area for the casing.')
print('Turtle with digging tool required. (Obviously)')
print()
print('Enable digging mode?')
if dichotomy('Yes','No') then
  diggingMode=true
else
  diggingMode=false
end
end
function placeSlot(side,slot)
if turtle.getItemCount(slot)==0 then
  print('Insufficient resources to complete build. Please place an item in slot '..tostring(slot))
  while turtle.getItemCount(slot)==0 do
   sleep(0.01)
  end
end
turtle.select(slot)
placeSide(side)
end
function placeSide(side)
if not side then
  turtle.place()
elseif side=='up' then
  turtle.placeUp()
elseif side=='down' then
  turtle.placeDown()
elseif side=='left' then
  turtle.turnLeft()
  turtle.place()
  turtle.turnRight()
elseif side=='right' then
  turtle.turnRight()
  turtle.place()
  turtle.turnLeft()
elseif side=='front' then
  turtle.place()
elseif side=='back' then
  turtle.turnRight()
  turtle.turnRight()
  turtle.place()
  turtle.turnRight()
  turtle.turnRight()
end
end
function caveLayers(final)
layer1Reverse=false
for i=1, 3 do
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  if not layer1Reverse and i~=3 then
   turtle.turnRight()
   turtle.dig()
   turtle.forward()
   turtle.digUp()
   turtle.turnRight()
  elseif layer1Reverse and i~=3 then
   turtle.turnLeft()
   turtle.dig()
   turtle.forward()
   turtle.digUp()
   turtle.turnLeft()
  end
  layer1Reverse=not layer1Reverse
end
if not final then
  turtle.digUp()
  turtle.up()
  turtle.turnRight()
  turtle.turnRight()
  turtle.digUp()
else
  turtle.turnRight()
  turtle.turnRight()
end
end

function layer1()
if not diggingMode then
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
  turtle.up()
  turtle.forward()
end
placeSlot('down',1)
for i2=1, 4 do
  for i3=1, 2 do
   turtle.forward()
   placeSlot('down',1)
  end
  turtle.turnRight()
end
turtle.forward()
turtle.turnRight()
turtle.forward()
placeSlot('down',1)
turtle.forward()
turtle.turnLeft()
turtle.forward()
turtle.turnRight()
turtle.turnRight()
end
function layer2()
turtle.up()
for i2=1, 4 do
  for i3=1, 2 do
   turtle.forward()
   placeSlot('down',2)
  end
  turtle.turnRight()
end
turtle.forward()
turtle.turnRight()
turtle.forward()
placeSlot('down',3)
turtle.forward()
turtle.turnLeft()
turtle.forward()
turtle.turnRight()
turtle.turnRight()
end
function layer3()
turtleInvert=false
turtle.forward()
for i2=1, 3 do
  placeSlot('front',1)
  for i=1, 2 do
   if not turtleInvert then turtle.turnRight() else turtle.turnLeft() end
   turtle.forward()
   if not turtleInvert then turtle.turnLeft() else turtle.turnRight() end
   placeSlot('front',1)
  end
  turtleInvert=not turtleInvert
  if i2~=3 then
   turtle.turnLeft()
   turtle.turnLeft()
   turtle.forward()
   turtle.turnRight()
   turtle.turnRight()
  else
   turtle.turnLeft()
   turtle.forward()
   turtle.turnLeft()
   turtle.forward()
   turtle.down()
   placeSlot('back',4)
   turtle.down()
   turtle.turnRight()
   turtle.turnRight()
   turtle.forward()
   turtle.turnRight()
   turtle.turnRight()
  end
end
end
function info()
term.clear()
term.setCursorPos(1,1)
enableDiggingMode()
term.clear()
term.setCursorPos(1,1)

print('Please place 18 standard machine casings in slot 1, 8 reinforced casings in slot 2, water in slot 3, and an industrial grinder in slot 4.')
print()
print('Add the required materials to the turtle, then select continue to proceed')
if dichotomy('Continue','Quit') then
  print()
  print('Construction will begin')
  sleep(1.5)
  term.clear()
  term.setCursorPos(1,1)
else
  os.reboot()
end

if countResources()<28 then
  term.clear()
  term.setCursorPos(1,1)
  print('There is a discrepency in the number of required materials.')
  print()
  print('If the turtle runs out, it will stall until more are added.')
  print()
  print('Continue anyway?')
  if dichotomy('Continue','Quit') then
   print('Construction will begin')
   sleep(1.5)
   term.clear()
   term.setCursorPos(1,1)
  else
   os.reboot()
  end
end
end
function countResources()
local count=0
for i4=1, 16 do
  count=count+turtle.getItemCount(i4)
end
return count
end
info()
if diggingMode then
turtle.turnLeft()
turtle.forward()
turtle.turnRight()
turtle.dig()
turtle.forward()
turtle.digUp()
caveLayers()
caveLayers(true)
end
layer1()
layer2()
layer3()
os.reboot()