[Lua] ~ [Error] ~ [Question] ~ 'then' expected

Intro of Awesomosity

Alright… So I noticed I needed 8 diamonds to make a quarry and I heard my friend talking about this mod called 'ComputerCraft' to make automated farms and such. I gave it a try and was overwhelmed by the possibilities…

I got the hang of lua pretty quick, so I decided to make a program for a quarry. It's now exactly 12 hours ago since I've discovered ComputerCraft, so you'll probably notice that the code isn't… optimal.


I begin by creating some variables:
x is vertical movement in the flat plane of minecraft
z is horizontal movement in the plane
y is up and down (lower is higher y values, sorry if you're confused ;)/>/> after all, this is ask the pros… :P/>/> )
c is the direction the turtle is aiming (1 being towards the positive x-axis, 2 the positive y- axis and so on to 4)
h is used to select the slots one after another, don't bother, I haven't implemented something that activates it yet.

i used alot of functions so I could repeat them as much as possible:

start(a, :(/>/> : used to start the quarry
noord() : this means 'north' in my language. i use it to move the turtle to the 'north' (positive x-axis)
zuid() : this means 'south', same use as 'north', only inversed.
dlinks() : makes the turtle turn left after going south.
drechts: makes the turtle turn right after going north.
save() : saves the current location, so the bot can return to where it was. not in use right now.
home () : makes the turtle go back to (1,0,1) (x,y,z)
drop() : drops the stuff. no use for now.
back() : returns after going home to the previous location. not in use right now.
west,up,down,south,east () : moves the turtle in that direction to the edge.
draai: turns the turtle like the previous position. not in use.

My error is the following: bios:206: [string "quarry"]:21: 'then' expected
I already have a then there, and I'm pretty sure I didn't forgot a 'end'.

Also… Is there a way to stop the pocess when the turtle is full, and then let him carry on what he was doing? If so, is there a possibility you could explain it? Since a while function over the whole code will just randomly stop wthin the program.


I wrote this in a 3 hour time span: (I indented it as much as possible, sorry if you're confused)

function start(a,:D/>/>
x=1
y=0
z=1
c=1
h=1
do
turtle.digDown()
turtle.down()
noord()
end
end
function noord()
if x<a then do
  turtle.dig()
  turtle.forward()
  x=x+1
  noord()
  end
  else
  if z=a and y=b then
   home()
   end
   end
  if z=a and y<b
  then
  do
   turtle.turnLeft()
   west()
   turtle.turnLeft()
   zuid()
   turtle.turnLeft()
   turtle.turnLeft()
   turtle.digDown()
   turtle.down()
   y=y+1
   c=1
   noord()
   end
   end
  if z<a then do
   drechts()
   end
   end
  end
end
function zuid()
if x>1 then do
  turtle.dig()
  turtle.forward()
  x=x-1
  zuid()
  end
  else
  if z=a and y=b then do
   home()
   end
   end
  if z=a and y<b then do
   turtle.turnRight()
   west()
   turtke.turnRight()
   c=1
   turtle.digDown()
   turtle.down()
   noord()
   end
   end
  if z<a then do
   dlinks()
   end
   end
  end
end
function dlinks()
do turtle.turnLeft()
  c=2
  turtle.dig()
  turtle.forward()
  z=z+1
  turtle.turnLeft()
  c=1
  noord()
  end
end
function drechts()
do turtle.turnRight()
  c=2
  turtle.dig()
  turtle.forward()
  z=z+1
  turtle.turnRight()
  c=3
  zuid()
  end
end
function save()
d=x
e=y
f=z
g=c
end
function home()
if c<4 then do
  turtle.turnRight()
  c=c+1
  home()
  else
  up()
  west()
  turtle.turnLeft()
  south()
  end
  end
end
function drop()
if h<10 then do
turtle.select(h)
turtle.drop
h=h+1
end
else
h=1
end
end
function back()
do turtle.turnLeft()
  east()
  turtle.turnLeft()
  north()
  down()
  c=1
  draai()
  x=d
  y=e
  z=f
  c=g
  end
end
function west()
if z>1 then do
  turtle.forward()
  z=z-1
  west()
  end
  end
end
function up()
if y>0 then do
  turtle.up()
  y=y-1
  up()
  end
  end
  end
function down()
if y<e then do
  turtle.down()
  y=y+1
  down()
  end
  end
  end
function south()
if x>1 then do
  turtle.forward
  x=x-1
  south()
  end
  end
end
function east()
if z<f then do
  turtle.forward()
  z=z+1
  east()
  end
  end
end
function draai()
if c<g then do
  turtle.turnRight()
  c=c+1
  draai()
  end
  end
end

X = Horizontal
Y = Vertical
Z = 3rd Dimension Imagine another X with the X and Y coordinates
In MC:
F = Facing direction
F:0 = South
F:1 = West
F:2 = North
F:3 = East

Solution:
if x<a then DO – get rid of that
get rid of every "do" in your code