module Troy::Helpers

def partial(name, locals = {})
  name = name.to_s
  basename = File.basename(name)
  dirname = File.dirname(name)
  partial = []
  partial << dirname unless dirname.start_with?(".")
  partial << "_#{basename}.erb"
  partial = partial.join("/")
  path = site.root.join("partials/#{partial}")
  locals = locals.merge(site: site, page: page)
  EmbeddedRuby.new(path.read, locals).render
rescue Exception => error
  raise "Unable to render #{path}; #{error.message}"
end