User:Nathan/Scripts/sigdash.js

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// This script changes the "Your signature with timestamp" edit button to use a real em dash instead of two hyphens.  <pre><nowiki>

(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);
    };
})();

// </nowiki></pre>