flack / openpsa

function toggle_twisty(id) {

    var element = document.getElementById(id);

    if (!element) {

        return;

    }

    let twisty = element.previousSibling.previousSibling.firstChild.nextSibling;

    twisty.classList.toggle('fa-caret-up');

    twisty.classList.toggle('fa-caret-down');

    if (element.parentNode.classList.contains('open')) {

        remove_anchor(id);

    } else {

        add_anchor(id);

    }

    element.parentNode.classList.toggle('open')

    element.parentNode.classList.toggle('closed')

}

function remove_anchor(id) {

    if (!window.location.hash) {

        return;

    }

    id = id.replace(/_contents[,]*/, '');

    var string = window.location.hash,

        regexp = new RegExp(id, 'g');

    string = string.replace(regexp, '');

    string = string.replace(/#[,]*/, '#');

    string = string.replace(/[,]*$/, '');

    string = string.replace(/,,/g, ',');

    window.location.hash = string;

}