How to use the wpgtk.data.util.get_hls_val function in wpgtk

def on_color_click(self, widget):
        self.done_lbl.set_text("")
        gcolor = Gdk.RGBA()
        gcolor.parse(widget.get_label())
        dialog = ColorDialog(self.parent, self.selected_file, gcolor)
        response = dialog.run()

        if response == Gtk.ResponseType.OK:
            r, g, b, _ = dialog.colorchooser.get_rgba()
            rgb = list(map(lambda x: round(x*100*2.55), [r, g, b]))
            hex_color = pywal.util.rgb_to_hex(rgb)
            widget.set_label(hex_color)

            gcolor = Gdk.color_parse(hex_color)
            if util.get_hls_val(hex_color, 'light') < 100:
                fgcolor = Gdk.color_parse('#FFFFFF')
            else:
                fgcolor = Gdk.color_parse('#000000')

            widget.set_sensitive(True)
            widget.modify_bg(Gtk.StateType.NORMAL, gcolor)
            widget.modify_fg(Gtk.StateType.NORMAL, fgcolor)

            for i, c in enumerate(self.button_list):
                if c.get_label() != self.color_list[i]:
                    self.color_list[i] = c.get_label()
            self.render_sample()
        dialog.destroy()

def keyword_colors(hexc, is_dark_theme=True):
    """extract active and inactive colors from a given
    hex color value"""
    brightness = util.get_hls_val(hexc, "light")

    active = util.alter_brightness(hexc, brightness * -0.20) \
        if is_dark_theme else util.alter_brightness(hexc, brightness * 0.30)

    inactive = util.alter_brightness(hexc, brightness * -0.45) \
        if is_dark_theme else hexc

    return {
        "active": active,
        "inactive": inactive,
        "newfront": active,
        "newback": inactive,
        "newglyph": util.alter_brightness(inactive, -15)
    }

def auto_adjust(colors):
    """create a clear foreground and background set of colors"""
    light = settings.getboolean("light_theme", False)

    if settings.getboolean("smart_sort", True):
        colors = smart_sort(colors)

    alter_brightness = util.alter_brightness
    get_hls_val = util.get_hls_val

    added_sat = 0.25 if light else 0.1
    sign = -1 if light else 1

    if light == is_dark_theme(colors):
        colors[7], colors[0] = colors[0], colors[7]

    comment = [alter_brightness(colors[0], sign * 25)]
    fg = [alter_brightness(colors[7], sign * 60)]
    colors = colors[:8] + comment \
        + [alter_brightness(x, sign * get_hls_val(x, "light") * 0.3, added_sat)
           for x in colors[1:7]] + fg

    return colors