version_update.rake

version_update.rake

NAMESPACE_MAP = {'ns' => 'http://maven.apache.org/POM/4.0.0'}
require 'nokogiri'
require 'find'

namespace :mvn do 
    desc "[path, version] upgrade this version and all of it's children to the version specified as the second character"
    task :version, :path, :version_str do |t, args|
        base_path = args[:path]
        version = args[:version_str]
        puts "Updating all poms in #{base_path} to parent version #{version}"
        Find.find(base_path) do |path|
            if FileTest.directory?(path)
                if File.basename(path)[0] == ?.
                    Find.prune       # Don't look any further into this directory.
                else
                    next
                end
            else
                basename = File.basename(path)
                if(basename == 'pom.xml') 
                    handle_pom(version, path)
                end
            end
        end
    end
    
    def handle_pom(version, path)
        doc = Nokogiri::XML(File.open(path)) {|x| x.noblanks }
        packaging = doc.xpath('/ns:project/ns:packaging', NAMESPACE_MAP).first.text().strip()
        if(packaging == "pom")
            puts "Updating parent pom (#{path}) "
            version_node = doc.xpath('/ns:project/ns:version', NAMESPACE_MAP).first
        else 
            puts "Updating child pom (#{path}) "
            version_node = doc.xpath('/ns:project/ns:parent/ns:version', NAMESPACE_MAP).first
        end
        unless version_node.nil?
            version_node.content = version
            File.open(path,'w') do |f| 
                doc.write_xml_to f, :indent_text => ' ', :indent => 4
            end
        end
    end
end