Wikipedia:WikiProject User scripts/Scripts/Sigdash

// This script changes the "Your signature with timestamp" edit button to use a real em dash instead of two hyphens.
 
(function () {
    var oldAddButton = addButton;
    if (typeof(oldAddButton) != 'function') return;
    addButton = function () {
        if (arguments.length > 2)
            arguments[2] = arguments[2].replace(/^--(~+)$/, '—$1');
        oldAddButton.apply(this, arguments);
    };
})();
 
//