Lua function to convert RGB color representation to HSL

rgb2hsl.lua

local function rgb2hsl(r, g, b)
    local max, min = math.max(r, g, b), math.min(r, g, b)
    local h, s, l = (max + min) / 2, (max + min) / 2, (max + min) / 2

    if max == min then
        h, s = 0, 0 -- achromatic
    else
        local d = max - min
        local s = nil
        if l > 0.5 then
        	s = d / (2 - max - min)
        else
        	s = d / (max + min)
        end
        if max == r then
        	local wtf = nil
        	if g < b then
        		wtf = 6
        	else
        		wtf = 0
        	end
        	h = (g - b) / d + wtf
        elseif max == g then
        	h = (b - r) / d + 2
        elseif max == b then
        	h = (r - g) / d + 4
        end
        h = h / 6
    end

    print("color is: " .. h .. " " .. " " .. s .. " " .. l)

    return h, s, l
end