Automatic discovery of NuGet dependencies.

nuspec.rb

def auto_add_dependencies(projects)
  projects.each do |project|
    each_project_dependency do |dependency|
      @dependencies.push dependency
    end
  end
end

def get_packages_config(project)
  return File.join File.dirname project, 'packages.config'
end

def each_project_dependency(project)
  packages_config = get_packages_config project
  return [] unless File.exists? packages_config

  each_package packages_config do |id, version|
    yield Dependency.new id, version
  end
end

def each_package(packages_config)
  xml = File.read packages_config
  doc = REXML::Document.new xml
  doc.elements.each 'packages/package' do |package|
    yield package.attributes['id'], package.attributes['version'] if block_given?
  end
end

packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="StructureMap" version="2.5.2" />
  <package id="Machine.Specifications" version="0.5" />
</packages>

rakefile.rb

nuspec :create_nuspec do |nuspec|
  nuspec.auto_add_dependencies FileList['./source/**/*.csproj']
end

For this Albacore issue.