Cells Erbse automatic escaping

app_cell.rb

require 'cell'

class AppCell < Cell::ViewModel
  include ::Cell::Erb

  def show
    render
  end

  def template_options_for(*args)
    super.merge(escape: true)
  end
end

class Cell::ViewModel::OutputBuffer
  def safe_expr_append=(value)
    self.safe_append = CGI.escape_html(value.to_s)
  end
end

# Makes this ERB code work:
#
#   Escape this: <%= "<b>should not be bold</b>" %>
#   Don't escape this: <%== '<a href="#">muh link</a>' %>