View difference between Paste ID: fWWr2C5t and jTAkYCCF

 
 --------------------------------------------------------------------------------------------------------------------
 --> GLOBALS
 --------------------------------------------------------------------------------------------------------------------
 
 -- Position we reside in, relative to time of execution
 local pos = vector.new(0, 0, 0);
 
 -- Direction we're facing
 DIRECTION_FORWARD = 0x0;
 DIRECTION_LEFT    = 0x1;
 DIRECTION_BACK    = 0x2;
 DIRECTION_RIGHT   = 0x3;
 local dir = DIRECTION_FORWARD;
 
 --------------------------------------------------------------------------------------------------------------------
 --> TURTLE ABSTRACTION FUNCTIONS
 --------------------------------------------------------------------------------------------------------------------
 
 ---
 --- Rotates in dir, x times.  x will default to one.
 --- This updates the orientation of the turtle.
 ---
 local function rotate(d, x)
   if (not x) then
     x = 1;
   end
 
   for i = 1, x do
     if (d == DIRECTION_LEFT) then
       turtle.turnLeft();
 
       -- Increase with clamp
       if (dir == 3) then
         dir = 0;
       else
         dir = dir + 1;
       end
     else
       turtle.turnRight();
 
       -- Decrease with clamp
       if (dir == 0) then
         dir = 3;
       else
         dir = dir - 1;
       end
     end
   end
 end
 
 -- Helper functions for above
 local function left(x) rotate(DIRECTION_LEFT, x); end
 local function right(x) rotate(DIRECTION_RIGHT, x); end
 
 ---
 --- Changes the angle of a turtle to match desired using
 --- as little rotations possible
 ---
 local function setAngle(desired)
   local min = math.min(dir, desired);
   local max = math.max(dir, desired);
   local diff = max - min;
 
   -- 180 spins / right - forward
   if (diff == 2) then
     return left(2);
   elseif (diff == 3) then
     return left();
   end
 
   -- Should always be one right/left change
   if (desired > dir) then
     left();
   elseif (desired < dir) then
     right();
   end
 end
 
 ---
 --- Moves x blocks fowards caving one block above the turtle
 --- and one infront of it.  Updates coords.
 ---
 local function move(x)
   for i = 1, x do
 
     -- Forward can fail, dig until we move
     -- forwards succesfully
     repeat
       turtle.dig();
       turtle.digUp();
     until turtle.forward();
 
     -- Update coords
     if (dir == DIRECTION_FORWARD) then
       pos.y = pos.y + 1;
     elseif (dir == DIRECTION_LEFT) then
       pos.x = pos.x + 1;
     elseif (dir == DIRECTION_BACK) then
       pos.y = pos.y - 1;
     elseif (dir == DIRECTION_RIGHT) then
       pos.x = pos.x - 1;
     end
 
   end
 end
 
 ---
 --- Returns the turtle so that it's facing the block that it started on
 ---
 local function goHome()
   if (pos.x ~= 0) then
 
     -- Point in the direction of home
     if (pos.x > 0) then
       setAngle(DIRECTION_RIGHT);
     else
       setAngle(DIRECTION_LEFT);
     end
 
     move(math.abs(pos.x) - 1);
 
     -- Y-Axis will have offset
     if (pos.y ~= 0) then
       move(1);
     end
   end
 
   if (pos.y ~= 0) then
 
     -- Point in the direction of home
     if (pos.y > 0) then
       setAngle(DIRECTION_BACK);
     else
       setAngle(DIRECTION_FORWARD);
     end
 
     -- Always have offset on Y, X will have an offset if Y is aligned
     move(math.abs(pos.y) - 1);
   end
 end
 
 --[[
 ---
 --
 ---
 local function dump()
 
   -- Cache selected index
   local selected = ttl("getSelectedSlot");
 
   -- Dump items
   for i = 1, 16 do
     if (ttl("select", i)) then
       local count = ttl("getItemCount");
 
       if (count > 0) then
         ttl("drop", count - 1);
       end
     end
   end
 
   -- Restore selected index
   ttl("select", selected);
 end
 
 ---
 --- Refuel from chest infront of the turtle
 ---
 function refuel()
 
   local limit = ttl("getFuelLimit");
   local current = ttl("getFuelLevel");
   local need = limit - current;
   local count = math.ceil(need / 1000);
   local selected = ttl("getSelectedSlot");
 
   if (count > 64) then
    count = 64;
   end
 
   -- Attempt to aqquire fuel
   if (not ttl("suck", count)) then
     error("Could not refuel from storage");
   end
 
   -- Find fuel and refuel from it
   for i = 1, 16 do
     if (ttl("select", i)) then
       local count = ttl("getItemCount");
       if (ttl("refuel", count - 1)) then
         break;
       end
     end
   end
 
   ttl("select", selected);
 end]]--
 
 move(10);
 for i = 1, math.random(1, 5) do
   left()
   move(math.random(1, 15));
 end
 goHome();