module Roda::RodaPlugins::ViewSubdirs::InstanceMethods

def set_view_subdir(v)

to not use a view subdirectory.
Set the view subdirectory to use. This can be set to nil 
def set_view_subdir(v)
  @_view_subdir = v
end

def template_name(opts)

contain a slash.
there is a view subdirectory and the template name does not
Override the template name to use the view subdirectory if the 
def template_name(opts)
  name = super
  if (v = @_view_subdir) && name !~ /\//
    "#{v}/#{name}"
  else
    name
  end
end