Display tweets as "excerpts" in topic listings

tildes/tildes/models/topic/topic.py

@@ -376,3 +376,32 @@ class Topic(DatabaseModel):
             metadata_strings.append(f"{self.link_domain}")
 
         return ", ".join(metadata_strings)
+
+    @property
+    def content_excerpt(self) -> Optional[str]:
+        """Return the topic's content excerpt (if it has one)."""
+        if self.is_text_type:
+            return self.get_content_metadata("excerpt")
+
+        # if it looks like it's a link to a tweet
+        if (
+            self.is_link_type
+            and self.link_domain == "twitter.com"
+            and self.link
+            and "/status/" in self.link
+        ):
+            authors = self.get_content_metadata("authors")
+            tweet = self.get_content_metadata("description")
+
+            if authors and tweet:
+                return f"@{authors[0]}: {tweet}"
+
+        return None
+
+    @property
+    def is_content_excerpt_truncated(self) -> bool:
+        """Return whether the content excerpt has been truncated or not."""
+        if self.is_text_type and self.content_excerpt:
+            return self.content_excerpt.endswith("...")
+
+        return False

tildes/tildes/templates/macros/topics.jinja2

@@ -49,7 +49,7 @@
       {% endif %}
     </div>
 
-    {% if topic.is_text_type and topic.get_content_metadata('excerpt') %}
+    {% if topic.content_excerpt %}
       {{ topic_excerpt_expandable(topic) }}
     {% endif %}
 
@@ -87,11 +87,16 @@
   {% 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('...') %}
+    {% if topic.is_text_type %}
+      {% set full_text = topic.rendered_html|safe %}
+    {% else %}
+      {% set full_text = topic.content_excerpt %}
+    {% endif %}
+  {% else %}
+    {% set excerpt = topic.content_excerpt %}
+    {% set is_expandable = topic.is_content_excerpt_truncated %}
+    {% set full_text = topic.rendered_html|safe %}
   {% endif %}
 
   {% if is_expandable %}
@@ -101,10 +106,10 @@
       {% endif %}
     >
       <summary><span>{{ excerpt }}</span></summary>
-      {{ topic.rendered_html|safe }}
+      {{ full_text }}
     </details>
   {% else %}
-    <p class="topic-text-excerpt">{{ topic.get_content_metadata('excerpt') }}</p>
+    <p class="topic-text-excerpt">{{ excerpt }}</p>
   {% endif %}
 {% endmacro %}