Add mower script.

mower.lua

@@ -0,0 +1,85 @@
+--[[
+This script will make a turtle into a mower!
+It will drive in a zigzag pattern in the field and remove weeds.
+You can choose which objects it will destroy by changing the 
+appropriate string below. In order to dig, you also need to place a tool 
+in slot 1 of the turtle.
+
+Copyright 2016, George Kaklamanos <gkaklas1@gmail.com>
+You may use this script under the terms of the 
+GNU General Public License version 3 or later.
+For more info please read the LICENSE, which is included in this repository.
+--]]
+
+
+-- Select the item in slot 1 and equip the right hand side with it.
+turtle.select(1)
+turtle.equipRight(1)
+
+goRight = true
+while true do
+    success = moveAndDestroy()
+    if not success then
+        changeRow()
+    end
+end
+
+-- Is the block in front of us of the kind we want to destroy?
+function wantedBlock()
+    local s,data = turtle.inspect()
+    return data["name"] == "minecraft:yellow_flower"
+end
+
+-- Move forward one block, dig if necessary.
+function moveAndDestroy()
+    local success
+    if wantedBlock() then
+        turtle.dig()
+    end
+    if not turtle.detect() then
+        success = turtle.forward()
+    end
+    return success
+end
+
+function turn()
+    if goRight then
+        turtle.turnRight()
+    else 
+        turtle.turnLeft()
+    end
+end
+
+function antiturn()
+    if goRight then
+        turtle.turnLeft()
+    else 
+        turtle.turnRight()
+    end
+end
+
+
+-- Move to the next row of the zigzag pattern.
+function changeRow()
+    local success
+    -- Turn towards the right direction
+    turn()
+    -- If something is blocking the way, go around it.
+    while not moveAndDestroy() do  
+        turn()
+        moveAndDestroy()
+        antiturn()
+    end
+    -- Now we are in the next row, let's go to the beginning of it.
+    antiturn()
+    repeat
+        success = moveAndDestroy()
+    until not success
+
+    -- Turn around, towards the end of the row.
+    turn()
+    turn()
+
+    goRight = not goRight
+end
+