Adapt archive-portfolio.php with filter

gistfile1.txt

<?php
/**
 * @package WordPress
 * @subpackage Adapt Theme
 */
?>
<?php get_header(); ?>

    <?php
    // Load isotope scripts
    wp_enqueue_script( 'isotope', WPEX_JS_DIR . '/isotope.js' );
    wp_enqueue_script( 'isotope_init', WPEX_JS_DIR . '/isotope_init.js' );  ?>
    
    <header id="page-heading" class="clearfix">
        <h1><?php the_title(); ?></h1>	
        <?php $terms = get_terms( 'portfolio_category' ); ?>
		<?php if( $terms[0] ) { ?>
            <ul id="portfolio-cats" class="filter clearfix">
                <li><a href="#" class="active" data-filter="*"><span><?php _e('All', 'wpex'); ?></span></a></li>
                <?php foreach ($terms as $term ) : ?>
                	<li><a href="#" data-filter=".<?php echo $term->slug; ?>"><span><?php echo $term->name; ?></span></a></li>
                <?php endforeach; ?>
            </ul><!-- /portfolio-cats -->
        <?php } ?>	 
    </header><!-- /page-heading -->
    
    <?php if ( have_posts() ) : ?>
		<div id="portfolio-wrap" class="clearfix filterable-portfolio">
			<div class="portfolio-content">
        	<?php while( have_posts() ) : the_post() ?>
            	<?php get_template_part( 'content', 'portfolio') ?>
            <?php endwhile; ?>    
            <?php wpex_pagination(); ?>
        	</div><!-- /portfolio-content -->
		</div><!-- /portfolio-wrap -->
    <?php endif; ?>
 
<?php get_footer(); ?>