def _trim_text(text, max_width):
    """
    Trim the text to `max_width`, append dots when the text is too long.
    Returns (text, width) tuple.
    """
    width = get_cwidth(text)

    # When the text is too wide, trim it.
    if width > max_width:
        # When there are no double width characters, just use slice operation.
        if len(text) == width:
            trimmed_text = (text[:max(1, max_width-3)] + '...')[:max_width]
            return trimmed_text, len(trimmed_text)

        # Otherwise, loop until we have the desired width. (Rather
        # inefficient, but ok for now.)
        else:
            trimmed_text = ''
            for c in text:
                if get_cwidth(trimmed_text + c) <= max_width - 3:
                    trimmed_text += c
            trimmed_text += '...'

            return (trimmed_text, get_cwidth(trimmed_text))
    else:
        return text, width
dataset/ETHPy150Open jonathanslenders/python-prompt-toolkit/prompt_toolkit/layout/menus.py/_trim_text/original