-- Saved color codes, saving codes in here
-- in case they are needed another time.
local savedColors = {};

local HEX_BASE = 16; -- 0 - F = 16.
-- Hex digits (10 - 15) and a check function.
local hexDigits = {'A', 'B', 'C', 'D', 'E', 'F'};
local function isHexDigit(hexStr)
    for _, v in ipairs(hexDigits) do
        if v == hexStr then return true end;
    end
    return false;
end
-- Function to convert a decimal number to
-- a hexadecimal number.
local function decToHex(dec)
    local hex = "";
    while dec ~= 0 do
        local temp = dec % HEX_BASE
        if temp >= 10 then
            temp = hexDigits[temp-9];
        end
        hex = temp .. hex;
        dec = math.floor(dec / HEX_BASE);
    end
    if isHexDigit(hex) or tonumber(hex) and tonumber(hex) < 10 then
        hex = "0" .. hex;
    elseif hex == "" then
        hex = "00";
    end
    return hex;
end
-- Function to create the color code usable
-- in WoW.
local function createColorCode(...)
    local colorCode = "";
    local colorTable = {select(1, ...)};
    for _, v in ipairs(colorTable) do
        if tonumber(v) == nil then
            return false;
        end
        colorCode = colorCode .. decToHex(v);
    end
    return "|cff" .. colorCode;
end
-- This is the function to call to get the color
-- code associated with the RGB code.
-- RGB is a representation of a color mix of three
-- colors: R (red), G (green) and B (blue).
-- Numbers vary between 0 and 255.
-- Examples:
--  255, 0, 0 = red. Only red is used, so obv. we get red.
--  150, 0, 0 = dark red. Only red is used, however slightly,
--  so we get a darker color.
--  0, 255, 0 = green.
--  255, 0, 255 = purple. A mix of red and blue = purple.
function RGB(red, green, blue)
    local key = red .. green .. blue;
    local color = savedColors[key];
    if color == nil then
        color = createColorCode(red, green, blue);
        savedColors[key] = color;
    end
    return color;
end