tilde.news/app/views/users/tree.html.erb

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<div class="box wide">
<h1><%= @title %> (<%= number_with_delimiter(@user_count) %>)</h1>
<% if @newest %>
<p>
Newest users:
<% @newest.each do |user| %>
<%= styled_user_link user %>
<%= user_karma(user) %><%= ',' if user != @newest.last %>
<% end %>
</p>
<% end %>
<ul class="tree user_tree noparent">
<% subtree = @users_by_parent[nil] %>
<% ancestors = [] %>
<% while subtree %>
<% if (user = subtree.pop) %>
<li class="<%= user.invited_by_user_id ? "" : "noparent" %>">
<%= styled_user_link user %>
<%= user_karma(user) %>
<% if (children = @users_by_parent[user.id]) %>
<% # drill down deeper in the tree %>
<% ancestors << subtree %>
<% subtree = children %>
<ul class="user_tree">
<% else %>
</li>
<% end %>
<% else %>
<% # climb back out %>
<% subtree = ancestors.pop %>
<% if subtree %>
</ul></li>
<% end %>
<% end %>
<% end %>
</ul>
</div>