[Kata] PiedraPapelTijerasLagartoSpock

--[[----------------------------------------------
            Vocabulary and logic
----------------------------------------------]]--
voc = { 'piedra', 'papel', 'tijeras', 'lagarto', 'spock' }
who =
    {
        tijeras = { papel   = 'Tijeras cortan papel',
                    lagarto = 'Tijeras decapitan al lagarto'},
        papel   = { piedra  = 'Papel cubre a piedra',
            spock   = 'Papel desautoriza a Spock'},
        piedra  = { lagarto = 'Piedra aplasta a lagarto',
                    tijeras = 'Piedra aplasta las tijeras'},
        lagarto = { spock   = 'Lagarto envenena a Spock',
                    papel   = 'Lagarto se come el papel'},
        spock   = { tijeras = 'Spock destroza las tijeras',
                    piedra  = 'Spock vaporiza la piedra'}
    }

--[[----------------------------------------------
            Main activity
----------------------------------------------]]--
math.randomseed( os.time() )
print ( 'Choose one: \n'    ..
            '\tPiedra\n'    ..
            '\tPapel\n'     ..
            '\tTijeras\n'   ..
            '\tLagarto\n'   ..
            '\tSpock' )

user    = string.lower  ( io.read( '*line' ) )
cpu     = math.random   ( 0, 4 )
cpu     = voc [ cpu ]

if user == cpu then
    print 'Empate'
else
    if who [ cpu ][ user ] ~= nil then
        print ( who [ cpu ] [ user ] )
    else
        print ( who [ user ] [ cpu ] )
    end
end

--[[----------------------------------------------
    How to read from console:
--------------------------------------------------
    var = io.read ( arg ) -- where arg is:
    "*all"      reads the whole file
    "*line"     reads the next line
    "*number"   reads a number
    num         reads a string with up to num characters
----------------------------------------------]]--

--[[----------------------------------------------
    Random number:
--------------------------------------------------
    math.randomseed ( arg )
    math.random     ( min, max )
    -- arg is the seed
----------------------------------------------]]--