sinatra_4-6.rb

require 'sinatra'
set :title, "My Website"

#configureを使って環境依存オプションを指定する
configure :development, :test do
  enable :admin_access
end

if settings.admin_access?
  get('/admin') {'welocome to the admin area'}
end

get '/' do
  "<h1>#{settings.title}</h1>"
end