sidebar.php

<?php
function tag_sidebar(){
  $taxonomy     = 'product_cat';
  $orderby      = 'name';  
  $show_count   = 0;      // 1 for yes, 0 for no
  $pad_counts   = 0;      // 1 for yes, 0 for no
  $hierarchical = 1;      // 1 for yes, 0 for no  
  $title        = '';  
  $empty        = 0;

  $args = array(
         'taxonomy'     => $taxonomy,
         'orderby'      => $orderby,
         'show_count'   => $show_count,
         'pad_counts'   => $pad_counts,
         'hierarchical' => $hierarchical,
         'title_li'     => $title,
         'hide_empty'   => $empty
  );
 $all_categories = get_categories( $args );
 
 echo "<ul class=" . "'sidebar-parent-list'". ">";
 
 foreach ($all_categories as $cat) {
    if($cat->category_parent == 0) {
	$tag = get_queried_object();
	$modname = str_replace(" ","-", strtolower($cat->name));
        $category_id = $cat->term_id;       

        $args2 = array(
                'taxonomy'     => $taxonomy,
                'child_of'     => 0,
                'parent'       => $category_id,
                'orderby'      => $orderby,
                'show_count'   => $show_count,
                'pad_counts'   => $pad_counts,
                'hierarchical' => $hierarchical,
                'title_li'     => $title,
                'hide_empty'   => $empty
        );
        $sub_cats = get_categories( $args2 );
		
        if($sub_cats) 
	 {
			
            foreach($sub_cats as $sub_category) {
				
		if($tag->slug == "earrings")
	 	{
			if(strpos($sub_category->slug, "earring") == true)
			{			
               		 	echo "<li class=" . "'sidebar-list-items'" . ">" .'<a href="'. 
				       get_term_link($sub_category->slug, 'product_cat') .'">'. $cat->name .'</a>'. "</li>";
			}
					
		}
				
			elseif($tag->slug == "ring" ||$tag->slug == "bracelet"  || $tag->slug == "necklace"  )
			{
				if(strpos($sub_category->slug, $tag->slug) !== false && strpos($sub_category->slug, "earring") != true)
				{			
               			 	echo "<li class=" . "'sidebar-list-items'" . ">". '<a href="'. 
					       get_term_link($sub_category->slug, 'product_cat') .'">'. $cat->name .'</a>' . "</li>";
				}
			}
            }  
			
        }
    }       
}
	echo "</ul>";
}

add_shortcode('tagsidebar','tag_sidebar');