Extract and display nuget packages dependencies

dependency.rb

#! /usr/bin/env ruby

# Parse all NuGet packages under the package directory and print
# all packages names followeb by its dependencies. The format
# is not pretty, but useful combined with 'grep'.

require 'zip' # rubyzip
require 'rexml/document'

Dir.glob("packages/**/*.nupkg").each do |nupkg|
    Zip::File.open(nupkg) do |zip|
        zip.each do |entry|
            if /.nuspec$/.match(entry.name)
                xml_content = REXML::Document.new(entry.get_input_stream.read)
                xml_root = xml_content.root
                meta = xml_root.get_elements('//package/metadata').first
                id = meta.get_elements('id').first.text
                version = meta.get_elements('version').first.text
                package_description = "#{id} (#{version})"
                xml_root.each_element('//dependency') do |dep|
                    puts "#{package_description} : #{dep['id']} (#{dep['version']})"
                end
            end
        end
    end
end