added farming builds

Modules/modules.lua

@@ -129,3 +129,68 @@ function build_room(length, width, height)
 
   return true
 end
+
+-- sweepField() moves acress the rows
+-- and columns of an area in front and
+-- to the right of the turtle, calling
+-- the provided sweepFunc at each space
+function sweepField(length, width, sweepFunc)
+  local turnRightNext = true
+
+  for x = 1, width do
+    for y = 1, length do
+      sweepFunc()
+
+      -- don't move forward on the last row
+      if y ~= width then
+        turtle.forward()
+      end
+    end
+
+  
+    -- don't turn on the last column
+    if x ~= width then
+      -- turn to the next column
+      if turnRightNext then
+        turtle.turnRight()
+        turtle.forward()
+        turtle.turnRight()
+      else
+        turtle.turnLeft()
+        turtle.forward()
+        turtle.turnLeft()
+      end
+
+      turnRightNext = not turnRightNext
+    end
+  end
+
+
+  -- move back to the start position
+  if width % 2 == 0 then
+    turtle.turnRight()
+  else
+    for y = 1, length -1 do
+      turtle.back()
+    end
+    turtle.turnLeft()
+  end
+  turtle.turnRight()
+
+  return true
+end
+
+--findBlock() spins around searching
+--for the named block next to the turtle
+function findBlock(name)
+  local result, block
+
+  for i = 1, 4 do
+    result, block = turtle.inspect()
+    if block ~= nil and block['name'] == name then
+      return true
+    end
+    turtle.turnRight()
+  end
+  return false
+end