Use Thor for command parsing

Gemfile.lock

@@ -1,8 +1,9 @@
 PATH
   remote: .
   specs:
-    bourbon (1.4.0)
+    bourbon (2.1.1)
       sass (>= 3.1)
+      thor
 
 GEM
   remote: http://rubygems.org/
@@ -35,8 +36,9 @@ GEM
     rspec-expectations (2.8.0)
       diff-lcs (~> 1.1.2)
     rspec-mocks (2.8.0)
-    sass (3.1.15)
+    sass (3.2.1)
     term-ansicolor (1.0.7)
+    thor (0.15.4)
 
 PLATFORMS
   ruby

bin/bourbon

@@ -2,4 +2,4 @@
 
 require "bourbon"
 
-Bourbon::Generator.new(ARGV).run
+Bourbon::Generator.start

bourbon.gemspec

@@ -27,6 +27,7 @@ that support only CSS3 prefixed properties.
   s.require_paths = ["lib"]
 
   s.add_dependency('sass', '>= 3.1')
+  s.add_dependency('thor')
 
   s.add_development_dependency('aruba', '~> 0.4')
   s.add_development_dependency('rake')

lib/bourbon/generator.rb

@@ -1,19 +1,19 @@
 require "fileutils"
+require 'thor'
 
 module Bourbon
-  class Generator
-    def initialize(arguments)
-      @subcommand = arguments.first
-    end
-
-    def run
-      if @subcommand == "install"
-       install
-      elsif @subcommand == "update"
-        update
+  class Generator < Thor
+    desc 'install', 'Install Bourbon into your project'
+    def install
+      if bourbon_files_already_exist?
+        puts "Bourbon files already installed, doing nothing."
+      else
+        install_files
+        puts "Bourbon files installed to bourbon/"
       end
     end
 
+    desc 'update', 'Update Bourbon'
     def update
       if bourbon_files_already_exist?
         remove_bourbon_directory
@@ -24,15 +24,6 @@ def update
       end
     end
 
-    def install
-      if bourbon_files_already_exist?
-        puts "Bourbon files already installed, doing nothing."
-      else
-        install_files
-        puts "Bourbon files installed to bourbon/"
-      end
-    end
-
     private
 
     def bourbon_files_already_exist?