How to use the lookatme.contrib.contrib_first function in lookatme

@contrib_first
def render_list_end(token, body, stack, loop):
    """Pops the pushed ``urwid.Pile()`` from the stack (decreases indentation)

    See :any:`lookatme.tui.SlideRenderer.do_render` for argument and return
    value descriptions.
    """
    stack.pop()

@contrib_first
def render_heading(token, body, stack, loop):
    """Render markdown headings, using the defined styles for the styling and
    prefix/suffix.

    See :any:`lookatme.tui.SlideRenderer.do_render` for argument and return
    value descriptions.

    Below are the default stylings for headings:

    .. code-block:: yaml

        headings:
          '1':
            bg: default
            fg: '#9fc,bold'
            prefix: "██ "

@contrib_first
def render_newline(token, body, stack, loop):
    """Render a newline

    See :any:`lookatme.tui.SlideRenderer.do_render` for argument and return
    value descriptions.
    """
    return urwid.Divider()

@contrib_first
def render_loose_item_start(token, body, stack, loop):
    """Render the start of a list item. This function makes use of the styles:

    .. code-block:: yaml

        bullets:
          '1': "•"
          '2': "⁃"
          '3': "◦"
          default: "•"

    See :any:`lookatme.tui.SlideRenderer.do_render` for argument and return
    value descriptions.
    """
    return _list_item_start(token, body, stack, loop)

@contrib_first
def render_text(token=None, body=None, stack=None, loop=None, text=None):
    """Renders raw text. This function uses the inline markdown lexer
    from mistune with the :py:mod:`lookatme.render.markdown_inline` render module
    to render the lexed inline markup to
    `urwid Text markup `_.
    The created Text markup is then used to create and return a :any:`ClickableText`
    instance.

    Many other functions call this function directly, passing in the extra
    ``text`` argument and leaving all other arguments blank. 

    See :any:`lookatme.tui.SlideRenderer.do_render` for additional argument and
    return value descriptions.
    """
    if text is None:
        text = token["text"]

@contrib_first
def inline_html(text):
    return render_no_change(text)

@contrib_first
def render_block_quote_end(token, body, stack, loop):
    """Pops the block quote start ``urwid.Pile()`` from the stack, taking
    future renderings out of the block quote styling.

    See :any:`lookatme.tui.SlideRenderer.do_render` for additional argument and
    return value descriptions.
    """
    pile = stack.pop()

    # remove leading/trailing divider if they were added to the pile
    if isinstance(pile.contents[0][0], urwid.Divider):
        pile.contents = pile.contents[1:]
    if isinstance(pile.contents[-1][0], urwid.Divider):
        pile.contents = pile.contents[:-1]

@contrib_first
def render_list_item_start(token, body, stack, loop):
    """Render the start of a list item. This function makes use of the styles:

    .. code-block:: yaml

        bullets:
          '1': "•"
          '2': "⁃"
          '3': "◦"
          default: "•"

    See :any:`lookatme.tui.SlideRenderer.do_render` for argument and return
    value descriptions.
    """
    return _list_item_start(token, body, stack, loop)

@contrib_first
def render_table(token, body, stack, loop):
    """Renders a table using the :any:`Table` widget.

    See :any:`lookatme.tui.SlideRenderer.do_render` for argument and return
    value descriptions.

    The table widget makes use of the styles below:

    .. code-block:: yaml

        table:
          column_spacing: 3
          header_divider: "─"

    :returns: A list of urwid Widgets or a single urwid Widget
    """

@contrib_first
def render_code(token, body, stack, loop):
    """Renders a code block using the Pygments library.

    See :any:`lookatme.tui.SlideRenderer.do_render` for additional argument and
    return value descriptions.
    """
    lang = token.get("lang", "text") or "text"
    text = token["text"]
    res = pygments_render.render_text(text, lang=lang)

    return [
        urwid.Divider(),
        res,
        urwid.Divider(),
    ]