~gm-dev-launchpad/launchpad-gm-scripts/master

// ==UserScript==

// @name           LP_HideTags

// @namespace      http://thekorn.com/greasemonkey/

// @description    (Launchpad) hide and sort tags

// @include        https://*.launchpad.net/*

// @include        https://*.edge.launchpad.net/*

// @include        https://launchpad.net/*

// @date           2008-07-21

// @creator        Markus Korn <thekorn@gmx.de>

// ==/UserScript==

(function() {

// threshold: min. number of tag appearances for a project

var threshold = 10;

// max_tags: max. number of shown tags, if this is -1 all tags fitting the threshold criteria will be shown

var max_tags = 15;

// min_tags: if the number of tags for a project is smaller than this show a sorted list of all tags

var min_tags = 30;

// whitelist: always show tags in this list, ignore other setting for these tags

var whitelist = ["bitesize"];

// blacklist: do not show tags in this list

var blacklist = ["apport-crash", "apport-bug"];

// ------- End of User settable data -------

function xpath(query, context) {

    context = context ? context : document;

    return document.evaluate(query, context, null,

                            XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);

}

function sort_tags(a, b) {

    return b["count"] - a["count"];

}

function in_list(value, mylist) {

    for (s in mylist) {

        if (mylist[s] == value) {

            return true;

        }

    }

    return false;    

}

window.addEventListener("load", function(e) {

    var tags = [];

    var whitelist_tags = [];

    var tag_nodes = xpath("//div[@class='portlet' and @id='portlet-tags']/div[@class='portletBody']/table//tr");

    for ( var i = 0; i < tag_nodes.snapshotLength; i++ ) {

        var tag = {};

        var node = tag_nodes.snapshotItem(i);

        var m = xpath("td[2]", node);

        tag["count"] = m.snapshotItem(0).textContent;

        tag["node"] = node;

        m = xpath("td[1]/a", node);

        name = m.snapshotItem(0).textContent;

        if (in_list(name, blacklist)) {

            //Nothing

        } else if (in_list(name, whitelist)) {

            whitelist_tags.push(tag);

        } else if (!(tag_nodes.snapshotLength > min_tags && tag["count"] < threshold)) {

            tags.push(tag);

        }

        node.parentNode.removeChild(node);

    }

    tags = tags.sort(sort_tags);

    if (max_tags != -1) {

        tags = tags.slice(0, max_tags);

    }

    tags = tags.concat(whitelist_tags);

    tags = tags.sort(sort_tags);

    var tag_node = xpath("//div[@class='portlet' and @id='portlet-tags']/div[@class='portletBody']/table").snapshotItem(0);

    for ( var i = 0; i < tags.length; i++) {

        tag_node.appendChild(tags[i]["node"]);

    }

  }, false);

})();