View difference between Paste ID: 9KaENBMd and YzLLYEzm

 local settings={}
 settings["debug"]=false
 settings["reserveFuelLevel"]=10
 settings["nextStep"]=nil
 settings["rightNext"]=false
 settings["leftNext"]=false
 
 
 --CONSTANTS
 local cNone=0
 local cLeft=1
 local cYes=2
 local cNo=3
 local cPowerDown=4
 local cPowerUp=5
 local cForward=6
 local cReadyCharge=7
 local cComplete=8
 local cGoHome=9
 local cRight=10
 local cReboot=11
 local cShutdown=12
 local cClearSettings=13
 local cNeedFuel=14
 local cPairing=15
 
 function loadSettings()
    local file = fs.open("SnapBoxSettings","r")
    local data = file.readAll()
    file.close()
    settings=textutils.unserialize(data)
 end
 
 function saveSettings()
     local file = fs.open("SnapBoxSettings","w")
     file.write(textutils.serialize(settings))
     file.close()
 end
 
 function needFuel()
     local level=turtle.getFuelLevel()
     if level=="unlimited" or level>settings["reserveFuelLevel"] then
         sendMessageToPartner(cNo)
     else
         sendMessageToPartner(cYes)
     end
 end
 
 function checkStatus()
 	if turtle.getItemCount(1)>0 then
 		print("Energy Cell OK")
 	else
 		print("Please insert Locked Energy Tesseract or Redstone Energy Cell into slot 1")
 		while turtle.getItemCount(1)==0 do
 			turtle.select(1)
 			sleep(0.1)
 		end
 	end
 	if turtle.getFuelLevel()~="unlimited" and turtle.getFuelLevel()<settings["reserveFuelLevel"] then
         if turtle.getItemCount(16)>0 then
             print("Fuel Level OK")
         else
             turtle.select(16)
             print("Please insert fuel into slot 16")
             while turtle.getItemCount(16)==0 do
                 sleep(0.1)
             end
         end
     end
 end
 
 function waitForPartner()
 	print("Waiting for Box")
 	sendMessageToPartner(cPairing)
 	local message=nil
 	while message~=cPairing do
         event = os.pullEvent("redstone")
         message=redstone.getAnalogInput("front")
     end
     sendMessageToPartner(cPairing)
 	print("Off we go")
 end
 
 function sendMessageToPartner(message)
     if debug==true then
         print("Sent "..message)
     end
     redstone.setAnalogOutput("front",message)
     sleep(0.1)
     redstone.setAnalogOutput("front",cNone)
 end
 
 function forward()
     sendMessageToPartner(cForward)
     while turtle.forward()==false do
         sleep(0.1)
     end
     if settings["rightNext"]==true then
         turtle.turnRight()
         settings["rightNext"]=false
     end
     if settings["leftNext"]==true then
         turtle.turnLeft()
         settings["leftNext"]=false
     end
     saveSettings()
 end
 
 function readyCharge()
     sendMessageToPartner(cReadyCharge)
     while turtle.back()==false do
         sleep(0.1)
     end
     settings["nextStep"]="wait-forward"
     saveSettings()
     waitForward()
 end
 
 function waitForward()
     sleep(2)
     while turtle.detect()==true do
         sleep(0.1)
     end
     sleep(2)
     while turtle.forward()==false do
         sleep(0.1)
     end
     settings["nextStep"]=nil
     saveSettings()
     sendMessageToPartner(cComplete)
 end
 
 function powerUp()
 	turtle.select(1)
 	turtle.digDown()
     sendMessageToPartner(cPowerUp)
 end
 
 function powerDown()
 	turtle.select(1)
 	while turtle.placeDown()==false and turtle.getItemCount(1)>0 do
             sleep(0.1)
 	end
     sendMessageToPartner(cPowerDown)
 end
 
 function waitForMessageFromPartner()
     if settings["debug"]==true then
         print("Waiting for message")
     end
     os.pullEvent("redstone")
 
     --check to see if Box has turned and moved - only works on left turns :(
     local msg=redstone.getAnalogInput("front")
 
     if msg==cPowerDown then
         powerDown()
     elseif msg==cPowerUp then
         powerUp()
     elseif msg==cRight then
         settings["rightNext"]=true
         saveSettings()
         sendMessageToPartner(cRight)
     elseif msg==cLeft then
         settings["leftNext"]=true
         saveSettings()
         sendMessageToPartner(cLeft)
     elseif msg==cForward then
         forward()
     elseif msg==cClearSettings then
         shell.run("clearsettings")
     elseif msg==cShutdown then
         os.shutdown()
     elseif msg==cReboot then
         os.reboot()
     elseif msg==cNeedFuel then
         needFuel()
     elseif msg==cReadyCharge then
         readyCharge()
     end
 end
 
 function checkResume()
     local file=fs.open("SnapBoxSettings","r")
     if file==nil then
         return false
     else
         file.close()
         return true
     end
 end
 
 
 -----MAIN PROGRAM
 --Hack to fix situations where Snap gets left behind
 turtle.forward()
 
 term.clear()
 term.setCursorPos(1,1)
 
 --Check for a resume
 if checkResume()==false then
     --Check to make sure it has all the items it needs
     checkStatus()
 
     --initial refuel
     turtle.select(16)
     turtle.refuel()
     turtle.select(1)
 
     --wait to find partner
     waitForPartner()
     saveSettings()
 else
     print("Resuming")
     loadSettings()
 end
 
 while true do
     if settings["nextStep"]=="wait-forward" then
         waitForward()
     end
     waitForMessageFromPartner()
 end