using ant and ivy from rake with jruby

gistfile1.rb

require 'ant'

def ivy_retrieve(org, mod, rev)
  ant.retrieve :organisation => org,
    :module => mod,
    :revision => rev,
    :pattern => 'javalib/[conf]/[artifact].[ext]',
    :inline => true
end

artifacts = %w[
  junit junit 4.7
]

build_dir = "classes"
file build_dir

task :setup => [build_dir, "ivy:install"] do
  ant.property :name => "src.dir", :value => "src/main/java"
  ant.path(:id => "project.class.path") do
    pathelement :location => "classes"
  end
  artifacts.each_slice(3) do |*artifact|
    puts artifact.count
    puts artifact.class
    ivy_retrieve(*artifact[0])
  end
end

task :compile => :setup do
  mkdir_p build_dir
  ant.javac(:destdir => build_dir) do
    classpath :refid => "project.class.path"
    src { pathelement :location => "${src.dir}" }
  end
end

task :jar => :compile do
  ant.jar :destfile => "urlverifier.jar", :basedir => build_dir
end

task :default => :jar

namespace :ivy do
  ivy_install_version = '2.2.0'
  ivy_jar_dir = './ivy'
  ivy_jar_file = "#{ivy_jar_dir}/ivy.jar"

  task :download do
    mkdir_p ivy_jar_dir
    ant.get :src => "http://repo1.maven.org/maven2/org/apache/ivy/ivy/#{ivy_install_version}/ivy-#{ivy_install_version}.jar",
      :dest => ivy_jar_file,
      :usetimestamp => true
  end

  task :install => :download do
    ant.path :id => 'ivy.lib.path' do
      fileset :dir => ivy_jar_dir, :includes => '*.jar'
    end

    ant.taskdef :resource => "org/apache/ivy/ant/antlib.xml",
      #:uri => "antlib:org.apache.ivy.ant",
      :classpathref => "ivy.lib.path"
  end
end