Add Brother printer switcher proxied through one port, move sinatra to port 80

views/brother_picker.erb

@@ -0,0 +1,18 @@
+<h1>Brother printers</h1>
+<p>Choose a printer to open its label designer through this server.</p>
+
+<div class="list-group" style="max-width: 400px;">
+  <% @printers.each do |key, info| %>
+    <form action="/brother/select" method="POST" class="mb-2">
+      <input type="hidden" name="printer" value="<%= key %>">
+      <button type="submit" class="btn <%= @selected == key ? 'btn-primary' : 'btn-outline-primary' %> w-100 text-start">
+        <%= info[:label] %>
+        <% if @selected == key %> (active) <% end %>
+      </button>
+    </form>
+  <% end %>
+</div>
+
+<% if @selected %>
+  <p class="mt-3"><a href="/brother/">Open <%= @printers[@selected][:label] %> &raquo;</a></p>
+<% end %>