Sinatra app boilerplate so I don't have to go hunting for these settings every time.

app.rb

require 'bundler/setup'
require 'sinatra/base'
require 'sinatra/reloader'

unless File.exist?('session_secret.txt')
  puts 'Generating session_secret.txt with random number...'
  require 'securerandom'
  File.write('session_secret.txt', SecureRandom.hex(64))
  puts '...done'
end

class App < Sinatra::Base
  enable :sessions
  set :session_secret, File.read('session_secret.txt')
  enable :static

  configure :production, :development do
    enable :logging
  end

  configure :development do
    register Sinatra::Reloader
  end

  get '/' do
    erb 'hello world'
  end

  run! if app_file == $0
end

config.ru

require './app'
run App

Gemfile

source 'https://rubygems.org'

gem 'sinatra'
gem 'sinatra-contrib'