local function rgb_to_hex(rgb)
	local hexadecimal = '#'

	for key, value in pairs(rgb) do
		local hex = ''

		while(value > 0)do
			local index = math.fmod(value, 16) + 1
			value = math.floor(value / 16)
			hex = string.sub('0123456789ABCDEF', index, index) .. hex			
		end

		if(string.len(hex) == 0)then
			hex = '00'

		elseif(string.len(hex) == 1)then
			hex = '0' .. hex
		end

		hexadecimal = hexadecimal .. hex
	end

	return hexadecimal
end

local function color_from_hue(hue)
	local h = hue / 60
	local c = 255
	local x = (1 - math.abs(h%2 - 1)) * 255

  	local i = math.floor(h);
  	if (i == 0) then
		return rgb_to_hex({c, x, 0})
  	elseif (i == 1) then 
		return rgb_to_hex({x, c, 0})
  	elseif (i == 2) then 
		return rgb_to_hex({0, c, x})
	elseif (i == 3) then
		return rgb_to_hex({0, x, c});
	elseif (i == 4) then
		return rgb_to_hex({x, 0, c});
	else 
		return rgb_to_hex({c, 0, x});
	end
end

return function(input)
	local step = 360 / input:len()
	local hue = 0
	local output = ""
	for i = 1, input:len() do
		local char = input:sub(i,i)
		if char:match("%s") then
			output = output .. char
		else
        	output = output  .. minetest.get_color_escape_sequence(color_from_hue(hue)) .. char 
		end
        hue = hue + step
	end
	return output
end