ComputerCraft Mining Turtle - Wall/Bottom

function digU()
  while turtle.detectUp() do
    turtle.digUp()
  end
end

function digF()
  while turtle.detect() do
    turtle.dig()
  end
end

function digD()
  while turtle.detectDown() do
    turtle.digDown()
  end
end

function goU()
  repeat
    digU()
    proofFuel()
  until turtle.up()
end

function goF()
  repeat
    digF()
    proofFuel()
  until turtle.forward()
end

function goD()
  repeat
    digD()
    proofFuel()
  until turtle.down()
end

function status()
  term.clear()
  term.setCursorPos(1,1)
  print("Build wall:")
  print("")
  if wall then
    print("H:"..other.." L:"..length)
  else
    print("W:"..other.." L:"..length)
  end
  print("")
  print(set.."/"..blocks.." set, "..(blocks-set).." left.")
end

function proofFuel()
  if turtle.getFuelLevel()==0 then
    turtle.select(16)
    while turtle.refuel(1)==false do
      term.clear()
      term.setCursorPos(1,1)
      print("Build wall:")
      print("")
      print("Put coal on slot 16.")
      os.sleep(4)
      turtle.select(16)
    end
    turtle.select(1)
  end
end

function place()
  local showFillMsg=true
  while true do
    digF()
    if turtle.getItemCount(1)>1 then
      if turtle.place() then
        return
      end
    else
      for i=2,15 do
        if turtle.compareTo(i) then
          turtle.select(i)
          if turtle.place() then
            turtle.select(1)
            return
          end
          break
        end
      end
    end
    if showFillMsg then
      term.clear()
      term.setCursorPos(1,1)
      print("Build wall:")
      print("")
      print("Put building blocks on slot 1.")
      print("Fill turtle with more of them.")
      showFillMsg=false
    end
    os.sleep(4)
  end
end

turtle.select(1)
term.clear()
term.setCursorPos(1,1)
print("Build wall:")
print("")
print("Put building blocks on slot 1")
print("Fill turtle with more of them.")
print("Put coal on slot 16.")
print("Wall/Bottom (w/b):")
term.setCursorPos(20,6)
if read()=="w" then
  term.setCursorPos(20,6)
  print("Wall")
  wall=true
else
  term.setCursorPos(20,6)
  print("Bottom")
  wall=false
end
term.setCursorPos(1,7)
if wall then
  print("Height:")
  repeat
    term.setCursorPos(9,7)
    print("          ")
    term.setCursorPos(9,7)
    other=tonumber(read())
  until other>0
else
  print("Width:")
  repeat
    term.setCursorPos(8,7)
    print("          ")
    term.setCursorPos(8,7)
    other=tonumber(read())
  until other>0
end
term.setCursorPos(1,8)
print("Length:")
repeat
  term.setCursorPos(9,8)
  print("          ")
  term.setCursorPos(9,8)
  length=tonumber(read())
until length>0
blocks=length*other
set=0
pos=0
for i=2,length do
  goF()
end
for iL=1,length do
  place()
  set=set+1
  status()
  for iO=2,other do
    if wall then
      if pos==0 then
        goU()
      else
        goD()
      end
    else
      if pos==0 then
        turtle.turnRight()
        goF()
        turtle.turnLeft()
      else
        turtle.turnLeft()
        goF()
        turtle.turnRight()
      end
    end
    place()
    set=set+1
    status()
  end
  if iL~=length then
    turtle.turnLeft()
    turtle.turnLeft()
    goF()
    turtle.turnLeft()
    turtle.turnLeft()
  end
  pos=(pos*-1)+1
end
if other>1 then
  if pos==1 then
    if wall then
      for i=2,other do
        goD()
      end
    else
      turtle.turnLeft()
      for i=2,other  do
        goF()
      end
      turtle.turnRight()
    end
  end
end