Rakefile in previews-0.0.4 vs Rakefile in previews-0.0.5

@@ -1,23 +1,30 @@
 require 'bundler'
 require 'rake/clean'
 require 'rake/testtask'
 gem 'rdoc' # we need the installed RDoc gem, not the system one
 require 'rdoc/task'
+require 'erb'
 
 include Rake::DSL
 
 Bundler::GemHelper.install_tasks
 
 Rake::TestTask.new do |t|
   t.pattern = 'test/tc_*.rb'
 end
 
-
 Rake::RDocTask.new do |rd|
-
   rd.main = "README.rdoc"
-
   rd.rdoc_files.include("README.rdoc","lib/**/*.rb","bin/**/*")
 end
 
-task :default => [:test]
+# compile 'README.md.erb' file into 'README.md' file
+task :readme do
+  puts "Compiling README.md"
+  @usage = `ruby bin/previews --help`.gsub(/^Usage: /, "Usage:\n```\n") + "```"
+  File.open("README.md", "w") do |f|
+    f.write ERB.new(File.new("README.md.erb", "r").read).result(binding)
+  end
+end
+
+task :default => [:test]
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