Quarry cover prototype

local fuelfail = 0
local matfail = 0
local movefail = 0
local startfail = 1
local matstart = 1

local function collision()
print("I ran into something.")
error()
end

local function refuel()
if turtle.getFuelLevel() < 10 then
fuelfail = 0 else
turtle.select(15)
if not turtle.place() then
collision()
end
turtle.suck(5)
turtle.refuel()
turtle.dig()
turtle.select(1)
fuelfail = fuelfail+1
if fuelfail > 1 then
print("I ran out of fuel.")
error()
else
return refuel()
end
end
end

local function material()
turtle.select(1)
if turtle.compareTo(14) then
else
turtle.drop()
end
while turtle.getItemCount() == 0 do
turtle.select(16)
if not turtle.place() then
collision()
end
turtle.select(1)
turtle.suck()
turtle.select(16)
turtle.dig()
turtle.select(1)
if not turtle.compareTo(14) and matstart == 1 then
print("The material enderchest is not")
print("providing the right thing,")
print("please check it's position in the inventory.")
error()
else
matstart = 0
end
matfail = matfail+1
if matfail > 1 then
print("I ran out of material.")
error()
else
end
end
matfail = 0
end

local function advDig()
while turtle.detect() do
turtle.dig()
if turtle.detect() then
os.sleep(0.8)
end
end
end
while true do
advDig()
refuel()
material()
turtle.select(1)
if not turtle.forward() then
collision()
end
if turtle.detectDown() and startfail == 1 then
print("I think I started in the wrong spot, ")
print("please place me in a")
print("valid starting position.")
error()
end
if startfail == 1 then
startfail = 0
end
if turtle.detectDown() then
movefail = movefail+1
if movefail > 1 then
print("I think I am done.")
error()
else turtle.back()
turtle.turnRight()
end
else
movefail = 0
turtle.placeDown()
end
end