Meta-Titler Gist for themes with built in settings for Title and Description

Meta Titler Gist with Settings

{% assign maxwords = 30 %}
{% if template == 'product' %}
  {% if collection %}
    <link rel="canonical" href="{{ shop.url }}{{ product.url }}" />
  {% endif %}
  {% assign mf = product.metafields.meta_data %}
  {% unless mf == empty %}
    {% for mf in product.metafields.meta_data' %}
      {% capture key %}{{ mf | first }}{% endcapture %}
      {% if key == 'title' %}
        <title>{{mf | last}}</title>
        <meta name="title" content="{{mf | last}}" />
      {% endif %}
      {% if key == 'meta_description' %}
        <meta name="description" content="{{mf | last}}" />
      {% endif %}
      {% if key == 'keywords' %}
        <meta name="keywords" content="{{mf | last}}" />
      {% endif %}
    {% endfor %}
  {% endunless %}
{% elsif template contains 'page' %}
  {% assign mf = page.metafields.meta_data %}
  {% unless mf == empty %}
    {% for mf in page.metafields.meta_data' %}
      {% capture key%}{{ mf | first }}{%endcapture%}
      {% if key == 'title' %}
        <title>{{mf | last}}</title>
        <meta name="title" content="{{mf | last}}" />
      {% endif %}
      {% if key == 'meta_description' %}
        <meta name="description" content="{{mf | last}}" />
      {% endif %}
      {% if key == 'keywords' %}
        <meta name="keywords" content="{{mf | last}}" />
      {% endif %}
    {% endfor %}
  {% endunless %}
{% elsif template == 'collection' %}
  <title>{{ shop.name }} - {{ page_title | escape }}</title>
  <meta name="description" content="{{collection.description | strip_html | strip_newlines | truncatewords: maxwords | escape}}" />
{% elsif template == 'index' %}
    {% if settings.home_title_tag != "" %}
       <title>{{ settings.home_title_tag }}</title>
	{% else %}
       <title>{{ shop.name }} - {{ page_title | escape }}</title>
    {% endif %}
  {% unless settings.meta_description == "" %}
      <meta name="description" content="{{ settings.meta_description }}" >
   {% endunless %}
{% else %}
   {% unless settings.meta_description == "" %}
      <meta name="description" content="{{ settings.meta_description }}" >
   {% endunless %}
    {% if settings.home_title_tag != "" %}
       <title>{{ settings.home_title_tag }}</title>
    {% else %}
       <title>{{ shop.name }} - {{ page_title | escape }}</title>
    {% endif %}
{% endif %}