show subscribed threads in inbox even when there's no unreads

apps/users.lua

@@ -298,6 +298,15 @@ app:get("user_inbox", "/:username/inbox", function(self)
   self.new_posts = {}
   local subscription = Subscriptions:find({user_id = me.id})
   if subscription then
+    self.all_subscriptions = db.query([[
+      SELECT threads.title AS thread_title, threads.slug AS thread_slug
+      FROM
+        threads
+      JOIN
+        subscriptions ON subscriptions.thread_id = threads.id
+      WHERE
+        subscriptions.user_id = ?
+    ]], me.id)
     local q = [[
     WITH thread_metadata AS (
       SELECT

views/user/inbox.etlua

@@ -2,6 +2,21 @@
   <h1 class="thread-title">Inbox</h1>
 </div>
 <div class="inbox-container">
+  <% if not all_subscriptions then %>
+  You have no subscriptions.<br>
+  <% else %>
+  Your subscriptions:
+  <ul>
+    <% for _, sub in ipairs(all_subscriptions) do %>
+      <li><a href="<%= url_for("thread", {slug = sub.thread_slug}) %>"><%= sub.thread_title %></a>
+      <form class="modform" method="post" action="<%= url_for("thread_subscribe", {slug = sub.thread_slug}) %>">
+        <input type="hidden" name="subscribe" value="unsubscribe">
+        <input class="warn" type="submit" value="Unsubscribe">
+      </form>
+      </li>
+    <% end %>
+  </ul>
+  <% end %>
   <% if #new_posts == 0 then %>
   You have no unread posts.
   <% else %>