Refactor text topic excerpt display into a macro

tildes/tildes/models/topic/topic.py

@@ -310,6 +310,11 @@ class Topic(DatabaseModel):
         return (self.get_content_metadata('domain')
                 or get_domain_from_url(self.link))
 
+    @property
+    def is_spoiler(self) -> bool:
+        """Return whether the topic is marked as a spoiler."""
+        return 'spoiler' in self.tags
+
     def get_content_metadata(self, key: str) -> Any:
         """Get a piece of content metadata "safely".
 

tildes/tildes/templates/macros/topics.jinja2

@@ -47,31 +47,7 @@
     </div>
 
     {% if topic.is_text_type and topic.get_content_metadata('excerpt') %}
-      {# warn about spoilers #}
-      {% if 'spoiler' in topic.tags %}
-        <details class="topic-text-excerpt">
-          <summary>
-            <span>Warning: this post may contain spoilers.</span>
-          </summary>
-          {{ topic.rendered_html|safe }}
-        </details>
-      {% else %}
-        {# if the "excerpt" is the full text, don't wrap in <details> #}
-        {% if not topic.get_content_metadata('excerpt').endswith('...') %}
-          <p class="topic-text-excerpt">{{ topic.get_content_metadata('excerpt') }}</p>
-        {% else %}
-          <details class="topic-text-excerpt"
-            {% if request.user and request.user.open_new_tab_text %}
-            data-js-external-links-new-tabs
-            {% endif %}
-          >
-            <summary>
-              <span>{{ topic.get_content_metadata('excerpt') }}</span>
-            </summary>
-            {{ topic.rendered_html|safe }}
-          </details>
-        {% endif %}
-      {% endif %}
+      {{ topic_excerpt_expandable(topic) }}
     {% endif %}
 
     <footer class="topic-info">
@@ -104,6 +80,31 @@
   </article>
 {% endmacro %}
 
+{% macro topic_excerpt_expandable(topic) %}
+  {% if topic.is_spoiler %}
+    {% set excerpt = 'Warning: this post may contain spoilers' %}
+    {% set is_expandable = True %}
+  {% else %}
+    {% set excerpt = topic.get_content_metadata('excerpt') %}
+
+    {# if the excerpt is the full text, it doesn't need to be expandable #}
+    {% set is_expandable = excerpt.endswith('...') %}
+  {% endif %}
+
+  {% if is_expandable %}
+    <details class="topic-text-excerpt"
+      {% if request.user and request.user.open_new_tab_text %}
+      data-js-external-links-new-tabs
+      {% endif %}
+    >
+      <summary><span>{{ excerpt }}</span></summary>
+      {{ topic.rendered_html|safe }}
+    </details>
+  {% else %}
+    <p class="topic-text-excerpt">{{ topic.get_content_metadata('excerpt') }}</p>
+  {% endif %}
+{% endmacro %}
+
 {% macro topic_voting(topic) %}
   {% if request.has_permission('vote', topic) %}
     {% if topic.user_voted %}