def remove(self, elem):
        """Remove a requirement.

        :param elem: a string or :class:`Requirement` instance.
        """
        if isinstance(elem, text_type):
            for requirement in self:
                if requirement.package == elem:
                    return super(Requirements, self).remove(requirement)
        return super(Requirements, self).remove(elem)
def disable_plugin(plugin):
    try:
        plugin = get_plugin(plugin)
    except KeyError:
        flash(_("Plugin %(plugin)s not found.", plugin=plugin.name), "danger")
        return redirect(url_for("management.plugins"))

    try:
        plugin.disable()
        flash(_("Plugin %(plugin)s disabled. Please restart FlaskBB now.",
                plugin=plugin.name), "success")
    except OSError:
        flash(_("It seems that FlaskBB does not have enough filesystem "
                "permissions. Try creating the 'DISABLED' file by "
                "yourself instead."), "danger")

    return redirect(url_for("management.plugins"))