fallback_resolver.rb

module Dryml
  # quacks like a Rails3 ActionView::Template
  class MissingTemplate
    attr_reader :details
    
    def identifier
      "#{@prefix}/#{@name}"
    end
    
    def mime_type
      details[:mime_type]
    end
    
    def initialize(name, details, prefix, partial)
      @name = name
      @details = details
      @prefix = prefix
      @partial = partial
    end
    
    def render(view, locals, &block)
      renderer = Dryml.empty_page_renderer(view)
      renderer.render_tag("#{@name}-page", locals)
    end

  end
  
  class FallbackResolver < ActionView::Resolver
    def find_templates(*args)
      [Dryml::MissingTemplate.new(*args)]
    end
  end
end

init.rb

ActionView::Template.register_template_handler(:dryml, Dryml::TemplateHandler)
ActionController::Base.view_paths << Dryml::FallbackResolver.new

template_handler.rb

  module Dryml    
    class TemplateHandler < ActionView::Template::Handler
      def self.call(template)
        "renderer = Dryml.page_renderer(self, local_assigns.keys, '#{template.details[:virtual_path]}', '#{template.identifier}')
        this = self.controller.send(:dryml_context) || local_assigns[:this]

        @this ||= this
        s = renderer.render_page(@this, local_assigns)

        # Important to strip whitespace, or the browser hangs around for ages (FF2)
        s.strip"
      end
    end
  end