version.rb in vagrant-libvirt-0.3.0

- old
+ new

@@ -1,5 +1,28 @@
 module VagrantPlugins
   module ProviderLibvirt
-    VERSION = '0.2.1'.freeze
+    VERSION_FILE = File.dirname(__FILE__) + "/version"
+
+    def self.get_version
+      if File.exist?(VERSION_FILE)
+        version = File.read(VERSION_FILE)
+      else
+        git_version = `git describe --tags`
+        version_parts = git_version.split('-').first(2) # drop the git sha if it exists
+        if version_parts.length > 1
+          # increment the patch number so that this is marked as a pre-release of the
+          # next possible release
+          main_version_parts = Gem::Version.new(version_parts[0]).segments
+          main_version_parts[-1] = main_version_parts.last + 1
+          version_parts = main_version_parts + ["pre", version_parts[1]]
+        end
+        version = version_parts.join(".")
+      end
+
+      return version.freeze
+    end
+
+    def self.write_version
+      File.write(VERSION_FILE, self.get_version)
+    end
   end
 end