Start the appengine-tools gem

lib/appengine-tools/rack.rb

 #!/usr/bin/ruby1.8 -w
 #
 # Copyright:: Copyright 2009 Google Inc.
 # Original Author:: Ryan Brown (mailto:ribrdb@google.com)
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
 require 'rexml/document'
 require 'rexml/formatters/pretty'

[woodie, 2009/07/03 00:59:21]

not used here anymore

 
 module AppEngine
   module Rack
     class Resources
       def initialize
         @includes = []
         @excludes = []
       end
     
       def include(glob)
@@ skipping 35 matching lines @@
           env = REXML::Element.new('env-variables') 
           each do |name, value|
             env.add_element('env-var').
                 add_attributes( { "name" => name, "value" => value } )
           end
           xml.add_element(env) 
         end
       end    
     end
   
     class RackApplication

[woodie, 2009/07/03 02:39:57]

# I liked my force-to-string mod, but with your way
# you should only generate the reader for :version 

      attr_accessor :application
      attr_reader :version, :static_files, :resource_files
      attr_reader :system_properties, :environment_variables
      attr_writer :ssl_enabled, :sessions_enabled

       attr_accessor :application, :version
       attr_writer :ssl_enabled, :sessions_enabled
       attr_reader :system_properties, :environment_variables
       attr_reader :static_files, :resource_files
     
       def initialize
         @version = '1'
         @system_properties = PropertyMap[ 'os.arch' => '',
                          'jruby.management.enabled' => 'false' ]
         @environment_variables = EnvVarMap.new
@@ skipping 13 matching lines @@
         @version = version.to_s
       end
     
       def configure(options={})
         [:system_properties, :environment_variables].each do |key|
           self.send(key).merge!(options.delete(key)) if options[key]
         end
         options.each { |k,v| self.send("#{k}=", v) }
       end
     
       def to_xml

[woodie, 2009/07/03 00:59:21]

It may be more appropriate to use doc

doc = REXML::Document...

         xml = REXML::Document.new.add_element('appengine-web-app')
         xml.add_attribute('xmlns','http://appengine.google.com/ns/1.0')
         xml.add_element('application').add_text(application)
         xml.add_element('version').add_text(version)
         xml.add_element('public-root').add_text('/public')
         static_files.to_xml(xml, 'static-files')
         resource_files.to_xml(xml, 'resource-files')
         system_properties.to_xml(xml)
         environment_variables.to_xml(xml)
-        xml.add_element('sessions-enabled').
-            add_text('true') if sessions_enabled?
-        xml.add_element('ssl-enabled').
-            add_text('true') if ssl_enabled?
-        xml
-      end
-
-      def write
-        Dir.mkdir('WEB-INF') unless File.exists?('WEB-INF')
-        open('WEB-INF/appengine-web.xml', 'w') do |out|
-          pretty_xml(out)
+        if sessions_enabled?
+          xml.add_element('sessions-enabled').add_text('true')
         end
-      end
-
-      def pretty_xml(out=nil)
-        fmt = REXML::Formatters::Pretty.new
-        fmt.compact = true
-        fmt.write(to_xml, out || String.new) 
+        if ssl_enabled?
+          xml.add_element('ssl-enabled').add_text('true')
+        end
+        return xml
       end
     end
   
     class << self
       def app
         @app ||= RackApplication.new
       end
 
       def configure(options={})
         self.app.configure(options)
       end
 
       def environment
         if $servlet_context
           if $servlet_context.server_info =~ %r{^Google App Engine Development/}
             "development"
           elsif $servlet_context.server_info =~ %r{^Google App Engine/}
             "production"
           end
         end
       end
     end
   end
 end