def download_file(url, dest=None, chunk_size=1024, replace="ask",
                  label="Downloading {dest_basename} ({size:.2f}MB)",
                  expected_extension=None):
    """Download a file from a given URL and display progress.

    :param dest: If the destination exists and is a directory, the filename
        will be guessed from the Content-Disposition header. If the destination
        is an existing file, the user will either be prompted to overwrite, or
        the file will be replaced (depending on the value of **replace**). If
        the destination does not exist, it will be used as the filename.
    :param int chunk_size: bytes read in at a time.
    :param replace: If `False`, an existing destination file will not be
        overwritten.
    :param label: a string which is formatted and displayed as the progress bar
        label. Variables provided include *dest_basename*, *dest*, and *size*.
    :param expected_extension: if set, the filename will be sanitized to ensure
        it has the given extension. The extension should not start with a dot
        (`.`).
    """
    dest = Path(dest or url.split("/")[-1])
    response = get(url, stream=True)
    if (dest.exists()
            and dest.is_dir()
            and "Content-Disposition" in response.headers):
        content_disposition = rfc6266.parse_requests_response(response)
        if expected_extension is not None:
            filename = content_disposition.filename_sanitized(
                expected_extension)
        filename = secure_filename(filename)
        dest = dest / filename
    if dest.exists() and not dest.is_dir():
        if (replace is False
                or replace == "ask"
                and not click.confirm("Replace {}?".format(dest))):
            return str(dest)
    size = int(response.headers.get("content-length", 0))
    label = label.format(dest=dest, dest_basename=dest.name,
                         size=size/1024.0/1024)
    with click.open_file(str(dest), "wb") as f:
        content_iter = response.iter_content(chunk_size=chunk_size)
        with click.progressbar(content_iter, length=size/1024,
                               label=label) as bar:
            for chunk in bar:
                if chunk:
                    f.write(chunk)
                    f.flush()
    return str(dest)
def _draw_comment(self, win, data, inverted):

        n_rows, n_cols = win.getmaxyx()
        n_cols -= 1

        # Handle the case where the window is not large enough to fit the text.
        valid_rows = range(0, n_rows)
        offset = 0 if not inverted else -(data['n_rows'] - n_rows)

        # If there isn't enough space to fit the comment body on the screen,
        # replace the last line with a notification.
        split_body = data['split_body']
        if data['n_rows'] > n_rows:
            # Only when there is a single comment on the page and not inverted
            if not inverted and len(self._subwindows) == 0:
                cutoff = data['n_rows'] - n_rows + 1
                split_body = split_body[:-cutoff]
                split_body.append('(Not enough space to display)')

        row = offset
        if row in valid_rows:

            attr = curses.A_BOLD
            attr |= (Color.BLUE if not data['is_author'] else Color.GREEN)
            self.term.add_line(win, '{author} '.format(**data), row, 1, attr)

            if data['flair']:
                attr = curses.A_BOLD | Color.YELLOW
                self.term.add_line(win, '{flair} '.format(**data), attr=attr)

            text, attr = self.term.get_arrow(data['likes'])
            self.term.add_line(win, text, attr=attr)
            self.term.add_line(win, ' {score} {created} '.format(**data))

            if data['gold']:
                text, attr = self.term.guilded
                self.term.add_line(win, text, attr=attr)

            if data['stickied']:
                text, attr = '[stickied]', Color.GREEN
                self.term.add_line(win, text, attr=attr)

            if data['saved']:
                text, attr = '[saved]', Color.GREEN
                self.term.add_line(win, text, attr=attr)

        for row, text in enumerate(split_body, start=offset+1):
            if row in valid_rows:
                self.term.add_line(win, text, row, 1)

        # Unfortunately vline() doesn't support custom color so we have to
        # build it one segment at a time.
        attr = Color.get_level(data['level'])
        x = 0
        for y in range(n_rows):
            self.term.addch(win, y, x, self.term.vline, attr)

        return attr | self.term.vline