local U = {}

function U.tprint(tbl, indent)
    if not indent then indent = 0 end
    for k, v in pairs(tbl) do
        local formatting = string.rep("  ", indent) .. k .. ": "
        if type(v) == "table" then
            print(formatting)
            U.tprint(v, indent + 1)
        elseif type(v) == 'boolean' then
            print(formatting .. tostring(v))
        else
            print(formatting .. v)
        end
    end
end

function U.hex2rgb(hex)
    hex = hex:gsub("#", "")
    return tonumber("0x" .. hex:sub(1, 2)), tonumber("0x" .. hex:sub(3, 4)),
           tonumber("0x" .. hex:sub(5, 6))
end

function U.gamma_corrector(value, gamma)
    value = ((value / 255) ^ (1 / gamma)) * 255
    return math.min(math.max(math.floor(value), 0), 255)
end

function U.color_gamma(hex, gamma)
    if hex:find('#') == nil then
        return hex
    end
    local r, g, b = U.hex2rgb(hex)
    r = U.gamma_corrector(r, gamma)
    g = U.gamma_corrector(g, gamma)
    b = U.gamma_corrector(b, gamma)
    return string.format("#%02x%02x%02x", r, g, b)
end

return U