{% extends "base.html" %}

{#
  Link-preview metadata. zensical emits `description`, `author` and a canonical
  URL, but nothing a social crawler reads, so a link to these pages posted to a
  forum or a feed renders as a bare URL. Everything below is derived from the
  page the build is already producing — no per-page front matter to keep in sync.
#}
{% block extrahead %}
  {% if page.meta and page.meta.title %}
    {% set title = page.meta.title %}
  {% elif page.title and not page.is_homepage %}
    {% set title = page.title | striptags ~ " - " ~ config.site_name %}
  {% else %}
    {% set title = config.site_name %}
  {% endif %}
  {% set description = (page.meta and page.meta.description) or config.site_description %}
  {% set image = config.site_url ~ config.extra.social_card.image %}

  <meta property="og:type" content="website">
  <meta property="og:site_name" content="{{ config.site_name }}">
  <meta property="og:title" content="{{ title }}">
  <meta property="og:description" content="{{ description }}">
  <meta property="og:url" content="{{ page.canonical_url }}">
  <meta property="og:image" content="{{ image }}">
  <meta property="og:image:width" content="1200">
  <meta property="og:image:height" content="630">
  <meta property="og:image:alt" content="{{ config.site_name }} — {{ config.site_description }}">

  <meta name="twitter:card" content="summary_large_image">
  <meta name="twitter:title" content="{{ title }}">
  <meta name="twitter:description" content="{{ description }}">
  <meta name="twitter:image" content="{{ image }}">
{% endblock %}