code: def follow(ctx, nick, url, force):
      
      source = Source(nick, url)
      sources = ctx.obj['conf'].following
  
      if not force:
          if source.nick in (source.nick for source in sources):
              click.confirm("➤ You’re already following {0}. Overwrite?".format(
                  click.style(source.nick, bold=True)), default=False, abort=True)
  
          _, status = get_remote_status([source])[0]
          if not status or status.status_code != 200:
              click.confirm("➤ The feed of {0} at {1} is not available. Follow anyway?".format(
                  click.style(source.nick, bold=True),
                  click.style(source.url, bold=True)), default=False, abort=True)
  
      ctx.obj['conf'].add_source(source)
      click.echo("✓ You’re now following {0}.".format(
          click.style(source.nick, bold=True)))
docs: Add a new source to your followings.