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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def echo_via_pager(text_or_generator, color=None):
 """This function takes a text and shows it via an environment specific pager on stdout. .. versionchanged:: 3.0 Added the `color` flag. :param text_or_generator: the text to page, or alternatively, a generator emitting the text to page. :param color: controls if the pager supports ANSI colors or not. The default is autodetection. """

    color = resolve_color_default(color)

    if inspect.isgeneratorfunction(text_or_generator):
        i = text_or_generator()
    elif isinstance(text_or_generator, string_types):
        i = [text_or_generator]
    else:
        i = iter(text_or_generator)

    # convert every element of i to a text type if necessary
    text_generator = (el if isinstance(el, string_types) else text_type(el)
                      for el in i)

    from ._termui_impl import pager
    return pager(itertools.chain(text_generator, "\n"), color)