How to make 🌈 lolcat colors style for input in xonsh?

[anki-code]

Inspired by

• https://github.com/tehmaze/lolcat/
• https://github.com/busyloop/lolcat/

[anki-code]

Example

~/.xonshrc

class LolcatProcessor(@.imp.prompt_toolkit.layout.processors.Processor):
    def apply_transformation(self, ti):
        try:
            n = @.imp.shutil.get_terminal_size().columns
        except:
            n = 100
        line_shift = ti.lineno * 0  # Replace 0 to 5 to have shift per line.
        new_fragments = []
        i = 0
        for style, text in ti.fragments:
            if style and "suggest" in style:
                new_fragments.append((style, text))  # Keep using grey for suggestion.
                continue
            for ch in text:
                hue = ((i + line_shift) / max(n, 1)) % 1.0
                r, g, b = @.imp.colorsys.hsv_to_rgb(hue, 1.0, 1.0)
                rainbow_style = f"fg:#{int(r*255):02x}{int(g*255):02x}{int(b*255):02x}"
                new_fragments.append((rainbow_style, ch))
                i += 1
        return @.imp.prompt_toolkit.layout.processors.Transformation(new_fragments)
        
__xonsh__.shell.shell.prompter.input_processors = [LolcatProcessor()]