Display tweet content on topic comments page

tildes/scss/modules/_topic.scss

@@ -240,6 +240,10 @@
   word-break: break-all;
 }
 
+.topic-full-content {
+  margin-top: 1rem;
+}
+
 .topic-full-text {
   overflow: auto;
 }

tildes/tildes/lib/url.py

@@ -17,3 +17,9 @@ def get_domain_from_url(url: str, strip_www: bool = True) -> str:
         domain = domain[4:]
 
     return domain
+
+
+def is_tweet(url: str) -> bool:
+    """Return whether a url is a link to a tweet."""
+    domain = get_domain_from_url(url)
+    return domain == "twitter.com" and "/status/" in url

tildes/tildes/models/topic/topic.py

@@ -31,7 +31,7 @@ from tildes.lib.datetime import utc_from_timestamp, utc_now
 from tildes.lib.id import id_to_id36
 from tildes.lib.markdown import convert_markdown_to_safe_html
 from tildes.lib.string import convert_to_url_slug
-from tildes.lib.url import get_domain_from_url
+from tildes.lib.url import get_domain_from_url, is_tweet
 from tildes.metrics import incr_counter
 from tildes.models import DatabaseModel
 from tildes.models.group import Group
@@ -393,13 +393,7 @@ class Topic(DatabaseModel):
         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
-        ):
+        if self.link and is_tweet(self.link):
             authors = self.get_content_metadata("authors")
             tweet = self.get_content_metadata("description")
 
@@ -415,3 +409,16 @@ class Topic(DatabaseModel):
             return self.content_excerpt.endswith("...")
 
         return False
+
+    @property
+    def additional_content_html(self) -> Optional[str]:
+        """Additional HTML related to the content that can be displayed."""
+        if not self.is_link_type:
+            return None
+
+        if self.link and is_tweet(self.link):
+            authors = self.get_content_metadata("authors")
+            tweet = self.get_content_metadata("description")
+            return f"<cite>@{authors[0]}:</cite><blockquote>{tweet}</blockquote>"
+
+        return None

tildes/tildes/templates/topic.jinja2

@@ -56,6 +56,10 @@
         {% if request.user.open_new_tab_external %}target="_blank"{% endif %}
       >{{ topic.link }}</a>
     </div>
+
+    {% if topic.additional_content_html %}
+      <div class="topic-full-content">{{ topic.additional_content_html|safe }}</div>
+    {% endif %}
   {% endif %}
 {% endif %}