"figaro" for sinatra

app.rb

 require_relative 'load_secrets'                                                  
 require 'sinatra/base'                                                           
                                                                                  
 class Application < Sinatra::Base                                                
   configure do                                                                   
     enable :logging, :show_exceptions, :dump_errors, :clean_trace, :static       
   end                                                                            
   enable :inline_templates                                                       
   get '/' do                                                                     
     "Hello World"                              
   end                                                                            
 end                                                                              
                                                                                  

config-application.yml

# goes in config/application.yml

defaults: &defaults                                                             
  APP_NAME: "my app"                                                         
                                                                                
development:                                                                    
  <<: *defaults                                                                 
                                                                                
test:                                                                           
  <<: *defaults                                                                 
                                                                                
staging:                                                                        
  <<: *defaults                                                                 

production:                                                                     
  <<: *defaults                                                                 

config.ru

require 'sinatra-syslog'                                                    
require_relative 'app'                                                      
require_relative 'load_secrets'                                             
                                                                            
use Sinatra::Syslog, "[sinatra] [#{ENV['APP_NAME']}-#{ENV['RACK_ENV']}] "   
                                                                            
run Application                                                             

load_secrets.rb

require 'yaml'                                                      
require 'erb'                                                       
                                                                    
path = 'config/application.yml'                                     
environment = ENV['RACK_ENV']                                       
                                                                    
parsed_yaml = YAML.load(ERB.new(File.read(path)).result)            
envs = parsed_yaml[environment]                                     
                                                                    
envs.each do |key, value|                                           
    ENV[key] = value unless ENV.key?(key)                           
end