Add structured data to Book (#84).

bookwyrm/templates/book/publisher_info.html

@@ -1,24 +1,71 @@
+{% spaceless %}
+
 {% load i18n %}
+
 <p>
-    {% if book.physical_format and not book.pages %}
-    {{ book.physical_format | title }}
-    {% elif book.physical_format and book.pages %}
-    {% blocktrans with format=book.physical_format|title pages=book.pages %}{{ format }}, {{ pages }} pages{% endblocktrans %}
-    {% elif book.pages %}
-    {% blocktrans with pages=book.pages %}{{ pages }} pages{% endblocktrans %}
-    {% endif %}
+    {% with format=book.physical_format pages=book.pages %}
+        {% if format %}
+            {% comment %}
+                @todo The bookFormat property is limited to a list of values
+                      whereas the book edition is free text.
+                @see https://schema.org/bookFormat
+            {% endcomment %}
+            <meta itemprop="bookFormat" content="{{ format }}">
+        {% endif %}
+
+        {% if pages %}
+            <meta itemprop="numberOfPages" content="{{ pages }}">
+        {% endif %}
+
+        {% if format and not pages %}
+            {% blocktrans %}{{ format }}{% endblocktrans %}
+        {% elif format and pages %}
+            {% blocktrans %}{{ format }}, {{ pages }} pages{% endblocktrans %}
+        {% elif pages %}
+            {% blocktrans %}{{ pages }} pages{% endblocktrans %}
+        {% endif %}
+    {% endwith %}
 </p>
+
 {% if book.languages %}
-<p>
-    {% blocktrans with languages=book.languages|join:", " %}{{ languages }} language{% endblocktrans %}
-</p>
+    {% for language in book.languages %}
+        <meta itemprop="inLanguage" content="{{ language }}">
+    {% endfor %}
+
+    <p>
+        {% with languages=book.languages|join:", " %}
+            {% blocktrans %}{{ languages }} language{% endblocktrans %}
+        {% endwith %}
+    </p>
 {% endif %}
+
 <p>
-    {% if book.published_date and book.publishers %}
-    {% blocktrans with date=book.published_date|date:'M jS Y' publisher=book.publishers|join:', ' %}Published {{ date }} by {{ publisher }}.{% endblocktrans %}
-    {% elif book.published_date %}
-    {% blocktrans with date=book.published_date|date:'M jS Y' %}Published {{ date }}{% endblocktrans %}
-    {% elif book.publishers %}
-    {% blocktrans with publisher=book.publishers|join:', ' %}Published by {{ publisher }}.{% endblocktrans %}
-    {% endif %}
+    {% with date=book.published_date|date:'M jS Y' publisher=book.publishers|join:', ' %}
+        {% if date or book.first_published_date %}
+            <meta
+                itemprop="datePublished"
+                content="{{ book.first_published_date|default:book.published_date|date:'Y-m-d' }}"
+            >
+        {% endif %}
+
+        {% comment %}
+            @todo The publisher property needs to be an Organization or a Person.
+                  We’ll be using Thing which is the more generic ancestor.
+            @see https://schema.org/Publisher
+        {% endcomment %}
+        {% if book.publishers %}
+            {% for publisher in book.publishers %}
+                <meta itemprop="publisher" content="{{ publisher }}">
+            {% endfor %}
+        {% endif %}
+
+        {% if date and publisher %}
+            {% blocktrans %}Published {{ date }} by {{ publisher }}.{% endblocktrans %}
+        {% elif date %}
+            {% blocktrans %}Published {{ date }}{% endblocktrans %}
+        {% elif publisher %}
+            {% blocktrans %}Published by {{ publisher }}.{% endblocktrans %}
+        {% endif %}
+    {% endwith %}
 </p>
+{% endspaceless %}