shell.run("clear")                                  --Clears the turtle's screen
print("Spacial Controls:")                          --Prints all the commands and their actions
print("W/S = Forward/Back")
print("A/D = Turn Left/Right")
print("Space/Shift = Move Up/Down")
print("")
print("Other Commands:")
print("ESC = Exit Program/Exit Turtle Interface")
print("R = Refuel from any slot")

                                                   --Defines the functions for the keys pressed
function forward()
  turtle.forward()
end

function back()
  turtle.back()
end

function lt()
  turtle.turnLeft()
end

function rt()
  turtle.turnRight()
end

function up()
  turtle.up()
end

function down()
  turtle.down()
end

function refuel()
  for i = 1, 16 do
    turtle.select(i)
    turtle.refuel(64)
  end
end

function terminate()
  os.reboot()
end

--Sets up a table for the key values and their respective function names.
commands = {[17] = forward,  [31] = back,  [30] = lt,  [32] = rt, [57] = up, [42] = down, [19] = refuel, [1] = terminate}

--Starts the loop
while true do
local event, button = os.pullEvent("key") --Defines an event variable for the computer to wait for a keypress
local fn = commands[button] --Defines a variable to get the index of the table based on the button pressed

--Checks to see if the fn variable is nil and if it's not run the variable fn as a function
  if fn ~= nil then
    fn()
  end
end