Turtlescript Suck Command

-- this program really sucks!

-- it sucks in front, below and ontop of the turtle.
-- Created Mar 21, 2014 by Kreezxil

function help()
    print("\
usage: suck [direction] [times]\
Where [direction] is one of:\
front, up, down or f, u, d or\
nothing at all and it will default\
to 'front' and where [times] is how\
many times you want it to suck, default is 1")
end

function suck(dir,amt)
    for n=1,amt do
        if dir == 'f' then
            turtle.suck()
            print("I'm sucking.")
        elseif dir == 'd' then
            turtle.suckDown()
            print("I'm sucking from below me.")
        else
            -- only option left now is 'up'
            turtle.suckUp()
            print("I'm sucking from above me.")
        end
    end
end

-- Process Arguments
local tArgs = { ... }
local direction = 'f'
local times = 1

if #tArgs == 2 then
    times = tonumber( tArgs[2] )
end

if #tArgs >= 1 then
    if tonumber( tArgs[1] ) ~= nil then
        -- ie suck 20, implies suck front 20
        times = tonumber( tArgs[1] )
    else
        direction = string.lower(string.sub( tArgs[1],1,1 ))
    end
end


--[[ Process command directives --]]
local paramError = 0

if tArgs[1] == "help" then
    help()
    return
end

if times <= 0 then
    print("You must specify a positive number for [times] or no number at all")
    paramError = paramError + 1
end

if string.find("fud",direction) == nil then
    print("Direction must be one of: front, up, down, f, u, or d")
    paramError = paramError + 1
end

if paramError > 0 then
    print("")
    print("Number of parameter errors are " .. paramError)
    print("Try:\n\tsuck help")
    return
end

suck(direction,times)