another script to print the version string from POM

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@16491 71c3de6d-444a-0410-be80-ed276b4c234a

Author: kohsuke

show-pom-version.rb

@@ -0,0 +1,8 @@
+#!/usr/bin/ruby
+# parse POM from stdin and prints the version number
+require "rexml/document"
+require "rexml/xpath"
+
+pom = REXML::Document.new $stdin
+# if the POM doesn't define the version by itself, it's inherited from the parent
+puts (pom.elements["/project/version"] || pom.elements["/project/parent/version"]).text