Add async for manage_subscriptions

src/invidious.cr

@@ -1438,6 +1438,12 @@ get "/subscription_ajax" do |env|
   user = env.get? "user"
   referer = get_referer(env)
 
+  redirect = env.params.query["redirect"]?
+  redirect ||= "false"
+  redirect = redirect == "true"
+
+  count_text = ""
+
   if user
     user = user.as(User)
 
@@ -1500,9 +1506,18 @@ get "/subscription_ajax" do |env|
         PG_DB.exec("UPDATE users SET subscriptions = array_remove(subscriptions,$1) WHERE id = $2", channel_id, sid)
       end
     end
+
+    count_text = PG_DB.query_one?("SELECT cardinality(subscriptions) FROM users WHERE id = $1", [sid], as: Int64)
+    count_text ||= 0
+    count_text = "#{number_with_separator(count_text)} subscriptions"
   end
 
-  env.redirect referer
+  if redirect
+    env.redirect referer
+  else
+    env.response.content_type = "application/json"
+    {"countText" => count_text}.to_json
+  end
 end
 
 get "/delete_account" do |env|