use dotenv to manage env variables

.env.example

@@ -0,0 +1 @@
+RACK_ENV=development

.gitignore

@@ -39,3 +39,4 @@ log/
 
 config/*.yml
 *.sqlite3
+.env

Gemfile

@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 
+gem 'dotenv'
+
 gem 'thin'
 gem 'sinatra'
 gem 'em-websocket'

Gemfile.lock

@@ -17,6 +17,7 @@ GEM
     arel (6.0.3)
     builder (3.2.2)
     daemons (1.2.3)
+    dotenv (2.0.2)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -56,6 +57,7 @@ PLATFORMS
   x86-mingw32
 
 DEPENDENCIES
+  dotenv
   em-websocket
   file-tail
   net-ssh

Rakefile

@@ -1,12 +1,14 @@
 # Rakefile
+require 'dotenv/tasks'
+
 require "sinatra/activerecord/rake"
 require "sinatra/base"
 
 require 'yaml'
 
 namespace :db do
-  task :environment do
-    current_env = Sinatra::Base.environment # RACK_ENV env variable || :development
+  task :environment => :dotenv do
+    current_env = ENV['RACK_ENV']
     db_config = YAML.load_file('config/database.yml')[current_env.to_s]
     ActiveRecord::Base.establish_connection :adapter => db_config["adapter"], :database =>  db_config["database"]
   end

app.rb

@@ -1,3 +1,6 @@
+require 'dotenv'
+Dotenv.load
+
 require 'sinatra/base'
 require 'sinatra/activerecord'
 
@@ -10,7 +13,7 @@
 require './models/service'
 
 class App < Sinatra::Base
-  set :environment, :development
+  set :environment, ENV['RACK_ENV']
   set :public_folder, Proc.new { File.join(root, "public") }
   set :views, Proc.new { File.join(root, "templates") }
   register Sinatra::ActiveRecordExtension