Simple build configuration file for Titanium Mobile Alloy. It extends the destroy method of each controller to automatically remove all event listeners which are defined in the view (XML).

alloy.jmk

function readContentFromFile(file)
{
    return require('fs').readFileSync(file).toString();
}

function writeContentToFile(file, content)
{
    require('fs').writeFileSync(file, content);
}

function isJsFile(filename)
{
    return (filename.match(/\.js$/));
}

function buildRemoveEventListenerCalls(content)
{
    var regex = /__defers(.*)\$(.*)\.addEventListener\((.*)\,\s(\w*)\)/gm;

    var cleanupCalls = [''];

    var match = null;
    while (match = regex.exec(content)) {
        var widget     = '$' + match[2]; // $.__views.index 
        var listener   = match[3];   // "click"
        var callback   = match[4];   // methodToCallOnClick
        var parameter  = '(' + listener + ', ' + callback + ');'; // ("click", methodToCallOnClick);
        var funcToCall = widget + '.removeEventListener'; // $.__views.index.removeEventListener
        cleanupCalls.push(widget + ' && ' + callback + ' && ' + funcToCall + ' && ' + funcToCall + parameter);
    }

    cleanupCalls.push('');

    return cleanupCalls.join('\n');
}

function extendControllerDestroyMethodToRemoveEventListener(jsFile)
{
    var resourceContent = readContentFromFile(jsFile);
    var cleanupCalls    = buildRemoveEventListenerCalls(resourceContent);

    var destroyMethod   = 'exports.destroy = function() {';
    var replacedContent = resourceContent.replace(destroyMethod, destroyMethod + cleanupCalls);

    writeContentToFile(jsFile, replacedContent);
}

function extendAllControllersDestroyMethodToRemoveEventListener(dir)
{
    var path   = require('path');
    var wrench = require('wrench');
    var resourcesPath = dir.resources + '/alloy/controllers';

    wrench.readdirSyncRecursive(resourcesPath).forEach(function(target) {

        if (!isJsFile(target)) {
            return;
        }

        var jsFile = path.join(resourcesPath, target);
        extendControllerDestroyMethodToRemoveEventListener(jsFile);
    });
}

task("post:compile", function(event, logger) {
    extendAllControllersDestroyMethodToRemoveEventListener(event.dir);
});