github pagination

github_pager.user.js

// ==UserScript==
// @name           github pagination
// @namespace      http://mattn.kaoriya.net/
// @description    generate newer/older link on github.com
// @include        https://github.com/*
// ==/UserScript==

(function() {
    // extend version of $X
    // $X(exp);
    // $X(exp, context);
    // $X(exp, type);
    // $X(exp, context, type);
    function $X (exp, context, type /* want type */) {
        if (typeof context == "function") {
            type    = context;
            context = null;
        }
        if (!context) context = document;
        exp = (context.ownerDocument || context).createExpression(exp, function (prefix) {
            return document.createNSResolver((context.ownerDocument === null ? context
                                                                             : context.ownerDocument).documentElement)
                           .lookupNamespaceURI(prefix) ||
                   document.contentType === "application/xhtml+xml" ? "http://www.w3.org/1999/xhtml" : "";
        });

        switch (type) {
            case String:  return exp.evaluate(context, XPathResult.STRING_TYPE, null).stringValue;
            case Number:  return exp.evaluate(context, XPathResult.NUMBER_TYPE, null).numberValue;
            case Boolean: return exp.evaluate(context, XPathResult.BOOLEAN_TYPE, null).booleanValue;
            case Array:
                var result = exp.evaluate(context, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
                for (var ret = [], i = 0, len = result.snapshotLength; i < len; i++) {
                    ret.push(result.snapshotItem(i));
                }
                return ret;
            case undefined:
                var result = exp.evaluate(context, XPathResult.ANY_TYPE, null);
                switch (result.resultType) {
                    case XPathResult.STRING_TYPE : return result.stringValue;
                    case XPathResult.NUMBER_TYPE : return result.numberValue;
                    case XPathResult.BOOLEAN_TYPE: return result.booleanValue;
                    case XPathResult.UNORDERED_NODE_ITERATOR_TYPE:
                        // not ensure the order.
                        var ret = [], i = null;
                        while ((i = result.iterateNext())) ret.push(i);
                        return ret;
                }
                return null;
            default: throw(TypeError("$X: specified type is not valid type."));
        }
    }

    if (!$X('//div[contains(concat(" ",@class," "), " pagination ")]')[0]) {
        var queryString = window.location.search.replace('?', '&');
        var split = queryString.split("&");
        var params = {};
        for (var i=0; i < split.length; i++) {
            var pair = split[i].split("=");
            params[pair[0]] = pair[1];
        }
        var page = parseInt(params['page']||0);
        var newer = page > 0 ?
            '<a href="/dashboard?page=' + (page-1) + '" hotkey="h">&laquo; Newer</a>'
            : '<div class="pagination"><span class="disabled">&laquo; Newer</span>';
        var older = '<a href="/dashboard?page=' + (page+1) + '" hotkey="l">Older &raquo;</a></div>';
        $X('//div[contains(concat(" ",@class," "), " repos ")]/preceding-sibling::div')[0].innerHTML += '<div class="pagination">' + newer + older + '</div>';
    }
})();