// ==UserScript==
// @name Nothing before the 'but' counts
// @namespace nothingbeforethebut
// @description Replaces the string "I'm not Xist, but" with "I'm Xist, and"
// @include *
// @version 1.0.0
// @grant none
// ==/UserScript==
(function() {

    function walk(node)
    {
        // I stole this function from here:
        // http://is.gd/mwZp7E

        var child, next;

        switch ( node.nodeType )
        {
            case 1:  // Element
            case 9:  // Document
            case 11: // Document fragment
                child = node.firstChild;
                while ( child )
                {
                    next = child.nextSibling;
                    walk(child);
                    child = next;
                }
                break;

            case 3: // Text node
                handleText(node);
                break;
        }
    }

    function handleText(textNode)
    {
        var v = textNode.nodeValue;

        v = v.replace(/\b(I|i)'?m not (\w)ist,? but/gi, "I'm $2ist, and");

        textNode.nodeValue = v;
    }

    walk(document.getElementsByTagName('body')[0]);
    walk(document.getElementsByTagName('title')[0]);
}());