Add room reaction use to CLI room display

Add a line such as:

    Reactions: 375; top 5: 😈 (35), ❤️ (27), 😮 (26), 🤖 (22), 🐛 (21)

showing the total and top 5 reactions used in the room.

Author: jagerman

sogs/__main__.py

@@ -165,6 +165,9 @@ def close_conn():
 def print_room(room: Room):
     msgs, msgs_size = room.messages_size()
     files, files_size = room.attachments_size()
+    reactions = room.reactions_counts()
+    r_total = sum(x[1] for x in reactions)
+    reactions.sort(key=lambda x: x[1], reverse=True)
 
     msgs_size /= 1_000_000
     files_size /= 1_000_000
@@ -183,6 +186,7 @@ def print_room(room: Room):
 URL: {config.URL_BASE}/{room.token}?public_key={crypto.server_pubkey_hex}
 Messages: {msgs} ({msgs_size:.1f} MB)
 Attachments: {files} ({files_size:.1f} MB)
+Reactions: {r_total}; top 5: {', '.join(f"{r} ({c})" for r, c in reactions[0:5])}
 Active users: {active[0]} (1d), {active[1]} (7d), {active[2]} (14d), {active[3]} (30d)
 Moderators: {admins} admins ({len(ha)} hidden), {mods} moderators ({len(hm)} hidden)""",
         end='',

sogs/model/room.py

@@ -1044,6 +1044,22 @@ def attachments_size(self):
             "SELECT COUNT(*), COALESCE(SUM(size), 0) FROM files WHERE room = :r", r=self.id
         ).first()[0:2]
 
+    def reactions_counts(self):
+        """Returns a list of [reaction, count] pairs where count is the aggregate count of that
+        reaction use in this room"""
+        return [
+            (r, c)
+            for r, c in query(
+                """
+                SELECT reaction, COUNT(*)
+                FROM message_reactions JOIN messages ON messages.id = message
+                WHERE room = :r
+                GROUP BY reaction
+                """,
+                r=self.id,
+            )
+        ]
+
     def get_reactions(
         self,
         message_ids: List[int],