let f request =

% let new_thread_button =
%   if Option.is_none @@ Dream.session "nick" request then
%     Format.sprintf
%   {|<a class="btn btn-primary" id="new-thread-button-redirect" href="/login?redirect=%s">New Thread</a>|} (Dream.to_percent_encoded "/")
%   else {|<button class="btn btn-primary on" id="new-thread-button">New Thread</button>|}
% in
  <script type="text/javascript" src="/assets/js/babillard.js" defer="defer"></script>
  <h1>Babillard is love ❤️</h1>
  <br />
  <div class="row mb-3">
    <div class="col-lg-6 col-md-12">
      <div id="map"></div>
      <br />
      <button class="btn btn-primary" id="geolocalize">Geolocalize me</button>
      <button class="btn btn-primary off" id="return-button">Return</button>
      <%s! new_thread_button %>
    </div>
    <div class="col-lg-6 col-md-12">
      <div class="thread-preview on" id="thread-preview"></div>
      <div class="new-thread off" id="new-thread">
        <h2>New thread</h2>
        <span id="new-thread-info">
          Click the map and make a new thread:
        </span>
        <br />
        <%s! Post_form.f None request %>
      </div>
    </div>
  </div>