User:BilCat/Scripts/rollback.js

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* How to use:
 * 
 * Add the following to [[Special:Mypage/monobook.js]] as a
 * logged-in user using the monobook skin:
 *   importScript('User:Gracenotes/rollback.js');
 *
 * On diff pages, history pages and user contribution pages,
 * a "sum" link will appear next to "rollback".
 * When you click on "sum", you will be prompted to enter a
 * summary. Press "Cancel" to cancel, and leave a blank summary
 * to use the default. In the summary, the text "$user" will
 * automatically be replaced with the user name you're reverting.
 * e.g., "rv edits by $user; not true"
 *
 * To disable the link from appearing on any one of the pages,
 * add a line containing a list after the "importScript" statement. 
 * The options are 'diff', 'history', and 'user'. For example, to
 * disable the link on history pages and user contribution pages:
 *     rollbackLinksDisable = [ 'history', 'user' ]
 *
 * Please contact if there are any problems :)
 */

function addSumLink() {
    var rbnode = [], diffnode, index = {}, gebcn = document.getElementsByClassName
        ? function(a, b, c) { return a.getElementsByClassName(c) }
        : getElementsByClassName;
    if (typeof rollbackLinksDisable == 'object' && rollbackLinksDisable instanceof Array)
        for (var i = 0; i < rollbackLinksDisable.length; i++)
            index[rollbackLinksDisable[i]] = 1;
    if (!('user' in index) && wgCanonicalSpecialPageName == "Contributions")
        rbnode = gebcn(document.getElementById("bodyContent"), "span", "mw-rollback-link");
    else if (!('history' in index) && wgAction == "history")
        rbnode = gebcn(document.getElementById("pagehistory"), "span", "mw-rollback-link");
    else if (!('diff' in index) && (diffnode = document.getElementById("mw-diff-ntitle2")))
        rbnode = gebcn(diffnode, "span", "mw-rollback-link");
    for (var i = 0, len = rbnode.length; i < len; i++) {
        addRollbackSummaryLink(rbnode[i])
    }
}

function confirmRollback() {
    var url = this.href;
    var user = url.match(/[?&]from=([^&]*)/);
    if (!user) return;
    user = decodeURIComponent(user[1].replace(/\+/g, " "));
    var summary = prompt("Enter a summary to use for rollback.\n\nLeave blank to use the default. $user will be replaced with \"" + user + "\".", "")
    if (summary == undefined)
        return false;
    else if (summary == "")
        return true;
    this.href += "&summary=" + encodeURIComponent(summary.replace(/\$user/g, user));
    return true;
};

function addRollbackSummaryLink(rbnode) {
    var rblink = rbnode.getElementsByTagName("a")[0]
    var alink = rblink.cloneNode(true);
    alink.className = ""; //don't confuse other scripts
    alink.firstChild.nodeValue = "sum";
    alink.onclick = confirmRollback;
    rbnode.insertBefore(alink, rblink.nextSibling);
    rbnode.insertBefore(document.createTextNode(" | "), alink);
}
if (typeof rollbackLinksDisable == 'undefined')
    rollbackLinksDisable = [];

addOnloadHook(addSumLink);