[ComputerCraft] CGTmath (API/Program)

--[[DONT REMOVE THIS NOTICE!!!
Download: pastebin get Sg5rWMqD CGTmath || http://www.pastebin.com/Sg5rWMqD
Copyright ©COOLGAMETUBE
Copyright ©Buschrolle
Copyright ©JcraftxD

Release: 30.07.2015

EULA:
-I will not share this API whithout this notice!
-I able to modify aCFFnd reupload it, if this notice was not removed.
-I will credit COOLGAMETUBE.
-I able to set my Credit, if this Programm has modified(New Functions)
-This API will be FREE (no money)
-If i upload a programm, that include this API, i will set the Credits of COOLGAMETUBE]]



tArgs = {...}

local function DrawUsage()
    print("Usage: CGTmath help")
    print("Usage: CGTmath Usage")
    print("Usage: CGTmath GetVersion")
    print("Usage: CGTmath GetAuthor")
    print("Usage: CGTmath MagicClear")
    print("Usage: CGTmath MagicSpam")
    print("Usage: CGTmath digit_sum <number>")
    print("Usage: CGTmath invert <number>")
    print("Usage: CGTmath toInt <string (&) number>")
end

function Updates(fromTerm)
    rtMSG = "No more Updates will come! All new Functions will be implemeted in the \"WicowsTools\" API! \n Update: http://pastebin.com/REaZXV7W"
    if fromTerm then
        print(rtMSG)
    else
        return rtMSG
    end
end

function GetAuthor()
    return "COOLGAMETUBE"
end

function GetVersion()
    return 1.1
end

function MagicClear()
    l = {"[", "-", "]", " ", 0.5}
    x, y = term.getSize()
    lt = ""
    ct = ""
    for i = 1, x do
        le = l[2]
        if i == 1 then le = l[1] end
        if i == x then le = l[3] end
        lt = lt .. le
        ct = ct .. l[4]
    end
    for i = 1, y do
        term.setCursorPos(1, i -1)
        write(ct)
        term.setCursorPos(1, i)
        write(lt)
        sleep(l[5])
    end
    shell.run("clear")
end

function MagicSpam()
    s = 0.1
    x, y = term.getSize()
    lt = ""
    scnd = true
    for i = 1, y do
        for i = 1, x do
            lt = lt .. tostring(math.random(0,9))
        end
        term.setCursorPos(1, i)
        write(lt)
        if scnd then
            sleep(s)
            scnd = false
        else
            scnd = true
        end
    end
    term.setCursorPos(1,y)
end

function toInt(str)
    num = ""
    for a = 1, string.len(str) do
        l = string.sub(str, a,a)
        if l == "0" or l == "1" or l == "2" or l == "3" or l == "4" or l == "5" or l == "6" or l == "7" or l == "8" or l == "9" then
            num = num .. l
        end
    end
    if num == "" or num == nil then num = 0 end
    return tonumber(num)
end

function digit_sum(num)
    num = toInt(num)
    num = tostring(num)

    numlet = {}
    if string.len(num) > 1 then
        for a = 1, string.len(num) do
            numlet[a] = string.sub(num, a,a)
        end
    else
        numlet[1] = num
    end
    local result = nil
    if #numlet > 1 then
        local rn = 0
        for i = 1, #numlet do
            rn = rn + toInt(numlet[i])
        end
        result = rn
    else
        result = toInt(numlet[1])
    end
    return result
end

function invert(num)
    num = toInt(num)
    num = tostring(num)
    numlet = {}
    if string.len(num) > 1 then
        for a = 1, string.len(num) do
            numlet[a] = string.sub(num, a,a)
        end
    else
        numlet[1] = num
    end

    local result = nil
    if #numlet > 1 then
        local rn = ""
        for i = 1, (#numlet) do
            rn = rn..numlet[#numlet-i+1]
        end
        result = rn
    else
        result = numlet[1]
    end
    return result
end

    local Ac = #tArgs
    local mnum = 0
    if Ac > 0 then
        local func = tArgs[1]

        if Ac > 1 then mnum = tArgs[2] end
        if     func == "help" then DrawUsage()
        elseif func == "Usage" then DrawUsage()
        elseif func == "GetVersion" then GetVersion()
        elseif func == "GetAuthor" then GetAuthor()
        elseif func == "MagicClear" then MagicClear()
        elseif func == "MagicSpam" then MagicSpam()
        elseif func == "digit_sum" then if Ac > 1 then print("Result: "..tostring(digit_sum(mnum))) else DrawUsage() end
        elseif func == "invert" then if Ac > 1 then print("Result: "..tostring(invert(mnum))) else DrawUsage() end
        elseif func == "toInt" then if Ac > 1 then print("Result: "..tostring(toInt(mnum))) else DrawUsage() end
        else
            DrawUsage()
        end
    end