bp_core_members_shortlink_redirector( string $member_slug )

function bp_core_members_shortlink_redirector( $member_slug ) {

	/**
	 * Shortlink slug to redirect to logged-in user.
	 *
	 * The x.com/members/me/* url will redirect to x.com/members/{LOGGED_IN_USER_SLUG}/*
	 *
	 * @since BuddyPress 2.6.0
	 *
	 * @param string $slug Defaults to 'me'.
	 */
	$me_slug = apply_filters( 'bp_core_members_shortlink_slug', 'me' );

	// Check if we're on our special shortlink slug. If not, bail.
	if ( $me_slug !== $member_slug ) {
		return $member_slug;
	}

	// If logged out, redirect user to login.
	if ( false === is_user_logged_in() ) {
		// Add our login redirector hook.
		add_action( 'template_redirect', 'bp_core_no_access', 0 );

		return $member_slug;
	}

	$user = wp_get_current_user();

	return bp_core_get_username( $user->ID, $user->user_nicename, $user->user_login );
}