fix(mine.lua): implemented unimplemented function

Turtle was mining too much, too soon

mine.lua

@@ -254,6 +254,14 @@ function mine (block)
     local height = block.v2.y + offset
     local start_v = copy_v(block.v1)
     local end_v = block.v1 + block.v2
+    if height > 2 then
+        start_v = start_v + UNIT_Y
+        end_v = end_v - UNIT_Y
+    elseif height < -2 then
+        start_v = start_v - UNIT_Y
+        end_v = end_v + UNIT_Y
+    end
+    moveAbs(start_v)
     if height % 3 == 0 then
         mode.mine = { up = true, forward = true, down = true }
     elseif height == 2 then
@@ -263,14 +271,6 @@ function mine (block)
         mode.mine = { forward = true, down = true }
         end_v = end_v + UNIT_Y
     end
-    if height > 2 then
-        start_v = start_v + UNIT_Y
-        end_v = end_v - UNIT_Y
-    elseif height < -2 then
-        start_v = start_v - UNIT_Y
-        end_v = end_v + UNIT_Y
-    end
-    moveAbs(start_v)
     moveAbs(end_v)
 end
 
@@ -286,6 +286,9 @@ function splitHorizontal (block)
     -- Future work: potentially split a large block into smaller blocks
     -- based on currentPos (think splitting down the middle instead of
     -- splitting off of one end)
+    local differentSigns = function (a, b)
+        return math.abs(a + b) < math.abs(a) + math.abs(b)
+    end
     local bigBlock = function (block)
         return (block.v2.x >= BIG_DIM) and (block.v2.z >= BIG_DIM)
     end