Fix releases sorting glitch with beta and rc releases

closes #20

Signed-off-by: Dominique Rose-Rosette <drose-rosette@af83.com>

desi.gemspec

@@ -17,6 +17,7 @@ an Elastic Search local install for development purposes.}
   gem.add_dependency "boson"
   gem.add_dependency "cocaine", "~> 0.5.3"
   gem.add_dependency "addressable"
+  gem.add_dependency "semantic", "~> 1.3.0"
 
   gem.add_development_dependency "rake"
   gem.add_development_dependency "rspec"

lib/desi/upstream.rb

@@ -2,6 +2,7 @@
 
 require "desi/http_client"
 require "json"
+require "semantic"
 
 module Desi
   class Upstream
@@ -34,7 +35,7 @@ def version
       protected
 
       def sortable_version
-        version.split('.').map {|c| c.to_i }
+        @sortable_version ||= Semantic::Version.new(version.sub(%r{.(beta|alpha|rc)}i, '-\1'))
       end
     end
 

spec/desi/upstream_spec.rb

@@ -7,8 +7,24 @@
     let(:v1) { Desi::Upstream::Release.new("v1.0.0", "") }
     let(:v09) { Desi::Upstream::Release.new("v0.90.10", "") }
 
-    it "sort the v1.0.0 before v0.90.10" do
+    it "sorts the v1.0.0 before v0.90.10" do
       expect([v09, v1].sort).to eql([v1, v09])
     end
+
+    it "sorts 1.0.0.RC2 before 1.0.0" do
+      expect([
+        Desi::Upstream::Release.new("v1.0.0.Beta1", ""),
+        Desi::Upstream::Release.new("v1.0.0.RC2", ""),
+        Desi::Upstream::Release.new("v1.0.0", ""),
+        Desi::Upstream::Release.new("v1.0.0.Beta2", ""),
+        Desi::Upstream::Release.new("v1.0.0.RC1", ""),
+      ].sort).to eql([
+        Desi::Upstream::Release.new("v1.0.0", ""),
+        Desi::Upstream::Release.new("v1.0.0.RC2", ""),
+        Desi::Upstream::Release.new("v1.0.0.RC1", ""),
+        Desi::Upstream::Release.new("v1.0.0.Beta2", ""),
+        Desi::Upstream::Release.new("v1.0.0.Beta1", "")
+        ])
+    end
   end
 end