// @match        https://teamtreehouse.com/*

function loginToTreehouse () {
    if ( !document.body.classList.contains("logged-in") ) {
        if ( window.location.href.indexOf("signin") == -1 ) {
            window.location.href = "https://teamtreehouse.com/signin?return_to=%2F";
        }
    }
}

loginToTreehouse();