Display bundle items under bundle in Order Printer packing slips

Prerequisite

• Enable “Enable bundle metafields” setting in Bundle Kit > Settings > Bundle Metafields.

• Enable “Add bundle items (products within the bundle) to orders” setting in Bundle Kit > Settings > Bundle Order.

• Have the “Shopify Order Printer” app installed.

Steps

<tbody>
  {% for line_item in order.line_items %}
  <tr>
    <td style="text-align: left;">{{ line_item.quantity }}</td>
    <td style="text-align: left;">{{ line_item.title }}</td>
  </tr>
  {% endfor %}
</tbody>

<tbody>
  {% assign nested_quantities = '' %}
  
  {% comment %}First pass: Display bundle products with their nested bundle items{% endcomment %}
  {% for line_item in order.line_items %}
    {% assign bundle_items = line_item.variant.metafields.app--5234301.bundle_items %}
    {% if bundle_items and bundle_items.size > 0 %}
      <tr>
        <td style="text-align: left;">{{ line_item.quantity }}</td>
        <td style="text-align: left;"><strong>{{ line_item.title }}</strong></td>
      </tr>
      
      {% for bundle_item in bundle_items %}
        {% assign nested_quantity = bundle_item.bundle_item_quantity | times: line_item.quantity %}
        <tr>
          <td style="text-align: left; padding-left: 20px;">{{ nested_quantity }}</td>
          <td style="text-align: left; padding-left: 20px; font-style: italic;">
            {% if bundle_item.variant_title == "Default Title" %}{{ bundle_item.product_title }}{% else %}{{ bundle_item.product_title }} - {{ bundle_item.variant_title }}{% endif %}
          </td>
        </tr>
        
        {% comment %}Track nested quantities by variant_id{% endcomment %}
        {% assign variant_key = bundle_item.variant_id | append: ':' %}
        {% assign existing_quantity = 0 %}
        {% assign nested_entries = nested_quantities | split: ',' %}
        {% for nested_entry in nested_entries %}
          {% if nested_entry contains variant_key %}
            {% assign entry_parts = nested_entry | split: ':' %}
            {% assign existing_quantity = entry_parts[1] | plus: 0 %}
            {% assign old_entry = bundle_item.variant_id | append: ':' | append: existing_quantity %}
            {% assign nested_quantities = nested_quantities | remove: old_entry %}
            {% break %}
          {% endif %}
        {% endfor %}
        {% assign new_quantity = existing_quantity | plus: nested_quantity %}
        {% assign new_entry = bundle_item.variant_id | append: ':' | append: new_quantity %}
        {% if nested_quantities == blank %}
          {% assign nested_quantities = new_entry %}
        {% else %}
          {% assign nested_quantities = nested_quantities | append: ',' | append: new_entry %}
        {% endif %}
      {% endfor %}
    {% endif %}
  {% endfor %}
  
  {% comment %}Second pass: Display remaining quantities for each unique variant{% endcomment %}
  {% assign displayed_variants = ',' %}
  {% for line_item in order.line_items %}
    {% assign bundle_items = line_item.variant.metafields.app--5234301.bundle_items %}
    {% unless bundle_items and bundle_items.size > 0 %}
      {% assign variant_check = ',' | append: line_item.variant_id | append: ',' %}
      {% unless displayed_variants contains variant_check %}
        
        {% comment %}Calculate total quantity for this variant{% endcomment %}
        {% assign total_quantity = 0 %}
        {% for all_line_items in order.line_items %}
          {% assign check_bundle = all_line_items.variant.metafields.app--5234301.bundle_items %}
          {% unless check_bundle and check_bundle.size > 0 %}
            {% if all_line_items.variant_id == line_item.variant_id %}
              {% assign total_quantity = total_quantity | plus: all_line_items.quantity %}
            {% endif %}
          {% endunless %}
        {% endfor %}
        
        {% comment %}Get nested quantity for this variant{% endcomment %}
        {% assign nested_quantity = 0 %}
        {% assign variant_key = line_item.variant_id | append: ':' %}
        {% assign nested_entries = nested_quantities | split: ',' %}
        {% for nested_entry in nested_entries %}
          {% if nested_entry contains variant_key %}
            {% assign entry_parts = nested_entry | split: ':' %}
            {% assign nested_quantity = entry_parts[1] | plus: 0 %}
            {% break %}
          {% endif %}
        {% endfor %}
        
        {% assign remaining_quantity = total_quantity | minus: nested_quantity %}
        {% if remaining_quantity > 0 %}
          <tr>
            <td style="text-align: left;">{{ remaining_quantity }}</td>
            <td style="text-align: left;">{{ line_item.title }}</td>
          </tr>
        {% endif %}
        
        {% assign displayed_variants = displayed_variants | append: line_item.variant_id | append: ',' %}
      {% endunless %}
    {% endunless %}
  {% endfor %}
</tbody>