Bob\Application::execute PHP Method

    function execute($tasks)
    {
        $this->prepareEnv();
        $tasks = (array) $tasks;
        $start = microtime(true);
        foreach ($tasks as $taskName) {
            if (!($task = $this['tasks'][$taskName])) {
                throw new \InvalidArgumentException(sprintf('Task "%s" not found.', $taskName));
            }
            $this['log']->info(sprintf('Running Task "%s"', $taskName));
            if ($this->projectDirectory) {
                Path::chdir($this->projectDirectory, array($task, 'invoke'));
            } else {
                $task->invoke();
            }
        }
        $this['log']->info(sprintf('Build finished in %f seconds', microtime(true) - $start));
    }