Linter for indentation of html

[toy]

It would be really useful to have a linter for html indentation level to see easier what wraps what, as it may be easy during refactoring to accidentally get confused about wrapping and follow indentation:

<%= some_helper %>
  <%= some_other_helper do %>
    <% if some_condition %>
    <%= some_helper %>
  <% end %>
<% end %>