script.liquid

{% assign theme_ids_and_publish_dates = options.theme_ids_and_publish_dates__keyval %}

{% if event.preview %}
  {% assign theme_to_publish = hash %}
  {% assign theme_to_publish["id"] = 1234567890 %}

{% elsif event.topic == "mechanic/user/trigger" or event.topic contains "mechanic/scheduler/" %}
  {% assign shop_theme_ids = shop.themes | map: "id" %}

  {% assign publication_candidates = array %}

  {% for keyval in theme_ids_and_publish_dates %}
    {% assign theme_id = keyval.first %}
    {% assign publish_date = keyval.last %}

    {% assign theme = shop.themes[theme_id] %}

    {% if theme == blank %}
      {% error
        message: "A theme with this id was not found in this shop.",
        theme_id: theme_id,
        shop_theme_ids: shop_theme_ids
      %}
    {% endif %}

    {% assign valid_publish_date = publish_date | parse_date: "%Y-%m-%d %H:%M" %}

    {% unless valid_publish_date %}
      {% assign valid_publish_date = publish_date | parse_date: "%Y-%m-%d" %}
    {% endunless %}

    {% if valid_publish_date == blank %}
      {% error
        message: "A theme publish date could not be parsed. Refer to the task documentation for valid date/time formats.",
        theme_id: theme_id,
        publish_date: publish_date
      %}
    {% endif %}

    {% assign publication_candidate = hash %}
    {% assign publication_candidate["theme"] = theme %}
    {% assign publication_candidate["publish_date"] = valid_publish_date | date: "%s" %}
    {% assign publication_candidates = publication_candidates | push: publication_candidate %}
  {% endfor %}

  {% assign publication_candidates = publication_candidates | sort: "publish_date" %}

  {% assign now = "now" | date: "%s" %}
  {% assign theme_to_publish = nil %}

  {% for publication_candidate in publication_candidates %}
    {% if publication_candidate.publish_date <= now %}
      {% assign theme_to_publish = publication_candidate.theme %}

    {% else %}
      {% break %}
    {% endif %}
  {% endfor %}
{% endif %}

{% if theme_to_publish != blank %}
  {% if theme_to_publish.role == "main" %}
    {% log
      message: "The theme to be published is already set as the main theme on the shop; skipping.",
      theme_to_publish: theme_to_publish
    %}

  {% else %}
    {% action "shopify" %}
      [
        "update",
        "theme",
        {
          "id": {{ theme_to_publish.id }},
          "role": "main"
        }
      ]
    {% endaction %}
  {% endif %}

{% else %}
  {% log "No themes qualify to be published based on their configured publish dates." %}
{% endif %}