respond_to

vendor/responder/init.rb

@@ -0,0 +1,3 @@
+require File.dirname(__FILE__) + '/lib/responder'
+
+Sinatra::EventContext.send(:include, Sinatra::Responder)

vendor/responder/lib/responder.rb

@@ -0,0 +1,42 @@
+# taken from Cheat
+
+# get '/foo/(\w+)'
+#  ... important code ...
+# 
+#   respond_to do |wants|
+#     wants.html { render :something }
+#     wants.text { "Just some text." }
+#     wants.yaml { "Something neat!".to_yaml }
+#     wants.xml  { "Also, XML.".to_xml }
+#   end
+# end
+
+module Sinatra
+  module Responder
+    def respond_to
+      yield response = Response.new(request.env["HTTP_ACCEPT"])
+      headers 'Content-Type' => response.content_type
+      body response.body
+    end
+
+    class Response
+      attr_reader :body, :content_type
+      def initialize(accept) @accept = accept end
+
+      TYPES = {
+        :yaml => %w[application/yaml text/yaml],
+        :text => %w[text/plain],
+        :html => %w[text/html */* application/html],
+        :xml  => %w[application/xml],
+        :json => %w[application/json]
+      }
+
+      def method_missing(method, *args)
+        if TYPES[method] && @accept =~ Regexp.union(*TYPES[method])
+          @content_type = TYPES[method].first 
+          @body = yield if block_given?
+        end
+      end
+    end
+  end
+end