background.js

// if( ! localStorage['firstRun'] )
// {
//     chrome.tabs.create( { url : "http://zaonce.com/projects/nukem.shtml" } );
//     localStorage['firstRun'] = 'true';
// }
var currentTab;
var elementsNuked = 0;

function getDefaultEntry()
{
    return {
        url: "",
        selector: "",
        delay: 0,
        method: "Blank"
    };
}

function setIcon( enabled )
{
    chrome.browserAction.setIcon( {
        path: "icons/nukem-" + ( enabled % 2 != 0 ? "19" : "19-disabled" ) + ".png"
    });
    chrome.browserAction.setTitle( {
        title: ( enabled % 2 != 0 ? "Stop" : "Start" ) + " nukin'..."
    });
}

function setBadge( count )
{
    chrome.browserAction.setBadgeText( {
        text: ( count > 0 ) ? count.toString() : ""
    });
}

function toggleEnabled()
{
    chrome.tabs.getSelected(
        null,
        function( tab )
        {
            chrome.tabs.sendRequest(
                tab.id,
                {
                    method: "toggle-enabled"
                },
                function( response )
                {
                    setIcon( response.enabled );
                    if( response.enabled )
                    {
                        chrome.tabs.query( {
                            active: true,
                            currentWindow: true
                        }, function( tabs )
                            {
                                currentTab = tabs[ 0 ].id;
                            });
                    }
                }
            );
        }
    );

    chrome.browserAction.setPopup( {
        popup: ""
    });
}

function addSite( url, selector )
{
    chrome.storage.sync.get( "settings", function( stored )
    {
        var settings = stored.settings === undefined ? [] : stored.settings;

        settings.push( {
            url: url,
            selector: selector,
            delay: "0",
            method: "Hide"
        });

        chrome.storage.sync.set( { settings: settings }, function()
        {
            console.log( "Failed to store settings: " + runtime.lastError );
        });
    });
}

function pageMatches( url, value )
{
    var pattern = "^" + value;
    pattern = pattern.replace( /\//g, "\\/" );
    pattern = pattern.replace( /\?/g, "\\?" );
    pattern = pattern.replace( /\./g, "\\." );
    pattern = pattern.replace( /\*/g, ".+" );
    var regex = new RegExp( pattern );
    var matched = url.search( regex ) != -1;

    return matched;
}

function getElements( url, callback )
{
    var selectors = [];

    chrome.storage.sync.get( "settings", function( stored )
    {
        var settings = stored.settings === undefined ? [] : stored.settings;

        settings.map( function( entry )
        {
            if( pageMatches( url, entry.url ) )
            {
                selectors.push( entry );
            }
        });

        callback( {
            elements: selectors
        });
    });
}

chrome.browserAction.onClicked.addListener( toggleEnabled );

chrome.tabs.onActivated.addListener( function( tabId, changeInfo, tab )
{
    setIcon( false );
    setBadge( 0 );

    if( currentTab )
    {
        chrome.tabs.sendMessage( currentTab, {
            method: "stop"
        }, function( response ) { });
    }
});

chrome.extension.onRequest.addListener(
    function( request, sender, sendResponse )
    {
        if( request.method === "remove" )
        {
            addSite( request.url, request.selector );
        }
        else if( request.method === "options" )
        {
            chrome.runtime.openOptionsPage( function() { });
        }
        else if( request.method === "getElements" )
        {
            elementsNuked = 0;
            setBadge( 0 );
            getElements( request.url, sendResponse );
        }
        else if( request.method === "elementNuked" )
        {
            setBadge( ++elementsNuked );
        }
        else
        {
            sendResponse(
                {}
            ); // snub them.
        }
    }
);