Button clicker game

--[[
    This program is made by Engineer on these forums: http://www.computercraft.info/forums2/
    When this program is being used please credit to the author; no legal actions will be taken in any way. Even when this is not done, but it would be nice.
]]--


if not os.loadAPI("redtracker") then
    local urlHandle = http.get("http://pastebin.com/raw.php?i=ANDVZV8V")
    local fileHandle = fs.open("redtracker", "w")
    fileHandle.write(urlHandle.readAll())
    urlHandle.close()
    fileHandle.close()
    os.loadAPI("redtracker")
end

local tArgs = { ... }
if #tArgs == 0 then
    print("No arguments given")
    return
end

local shouldCount = true
local order = {}
local tracker = {}
local runUntilKey = false
local count = 100

local function checkSide( sSide )
    for _, side in pairs(rs.getSides()) do
        if sSide == side or string.find(side, sSide) then
            return side
        end
    end
    return false
end

local function updateScreen()
    term.setBackgroundColour(colours.white)
    term.setTextColour(colours.black)
    term.clear()
    term.setCursorPos(1, 1)
    local w, h = term.getSize()
    for index, side in pairs(order) do
        print(string.format("Player %d", index))
        term.setBackgroundColour(math.pow(2, index + 1))

        local clicks = tostring(tracker[side])
        local width = math.floor(tracker[side] / count * w)
        write(clicks)
        if width > #clicks then
            write(string.rep(" ", width - #clicks))
        end
        print()
        term.setBackgroundColour(colours.white)
    end
end

local function callback(side, active)
    if active and shouldCount then
        tracker[side] = 1 + tracker[side]
        if tracker[side] == count then
            shouldCount = false
        end
        updateScreen()
    end
end

for _, option in pairs( tArgs ) do
    if option:sub(1, 2) == "s:" then
        local side = checkSide(option:sub(3, #option))
        if side then
            order[#order + 1] = side
            tracker[side] = 0
            redtracker.addCallback(callback, side)
        end
    elseif option:sub(1, 2) == "m:" then
        local side = option:sub(3, #option)
        if peripheral.isPresent(side) and peripheral.getType(side) == "monitor" then
            term.redirect(peripheral.wrap(side))
        end
    elseif option:sub(1, 2) == "c:" then
        local countInput = tonumber(option:sub(3, #option))
        if countInput > 0 then
            count = countInput
        end
    elseif option == "rununtilkey" then
        runUntilKey = not runUntilKey
    end
end

repeat
    updateScreen()
    while shouldCount do
        local event = os.pullEvent()
        if event == "redstone" then
            redtracker.update()
        elseif event == "key" and runUntilKey then
            runUntilKey = false
        elseif event == "monitor_resize" or event == "term_resize" then
            updateScreen()
        end
    end

    term.clear()
    term.setCursorPos(1, 1)
    for index, side in pairs(order) do
        if tracker[side] == count then
            print(string.format("Player %d wins!", index))
            print("Touch the screen to continue")
            os.pullEvent("monitor_touch")
            break
        end
    end
    for side, clicks in pairs(tracker) do
        tracker[side] = 0
    end
    shouldCount = true
until not runUntilKey

term.setBackgroundColour(colours.black)
term.clear()
if term.restore then
    term.restore()
else
    term.redirect(term.native())
end