go

local shell = require ( 'shell' )
local options = shell.parse ( ... )

local valid = {}
valid = {
  ['forward']  = function (a) valid ['_'](a) end,
  ['back']     = function (a) valid ['_'](a) end,
  ['up']       = function (a) valid ['_'](a) end,
  ['down']     = function (a) valid ['_'](a) end,
  ['left']     = function (a) for i=1,a do require('robot').turnLeft () end end,
  ['right']    = function (a) for i=1,a do require ('robot').turnRight () end end,
  ['_']        = function (a) for i=1,a do require('robot') [options[1]] () end end,
}

if options[1] ~= '_' and valid [options[1]] then
  valid [options[1]](tonumber(options[2]) or 1)
else
  io.write ( 'Usage: go direction [amount]\n' )
  io.write ( 'Direction: forward,back,up,down,left or right\n' )
end