Widgets Mapper from previous to the current theme

widget_mapper.php

<?php
add_action('after_setup_theme', 'mapThemeWidgets');
function mapThemeWidgets()
{
	$theme_slug = 'twentytwelve';

	// Hash of old to new sidebar IDs
	$map = array(
		'sidebar-1' => 'hjitw-right-widgets',
		'sidebar-2' => 'hjitw-footerwidgets'
	);
	
	// Previous theme's sidebar IDs
	if ($old_sidebars = get_option('theme_mods_' . $theme_slug))
	{
		// Current theme's sidebar IDs
		$current_sidebars 	= get_option('sidebars_widgets');

		// Assign old sidebar's content to the new sidebars via the hashmap
		foreach ($old_sidebars['sidebars_widgets']['data'] as $sidebar => $data)
		{
			$newSidebar = $map[$sidebar];
			$current_sidebars[$newSidebar] = $data;
		}

		// Update current sidebars option
		update_option('sidebars_widgets', $current_sidebars);
	}
}