gistfile1.rb

require 'csv'
DEFAULT_ATTRS = %w[
  network.interfaces.eth0.addresses
  network.interfaces.eth0.addresses
]
DEFAULT_QUERY = 'role:base'
DEFAULT_FILTER = Proc.new do |addresses|
  ipa = addresses.select { |address, config| config[:family] == 'inet' }.keys
  ipa.size == 1 ? ipa.first : ipa
end

def data_for_csv(query = DEFAULT_FILTER,
                 attrs = DEFAULT_ATTRS,
                 filter = DEFAULT_FILTER
                )
  search(:node, query).map do |node|
    [node.name] +
    attrs.map do |attr|
      filter.call(lookup_attr(node, attr))
    end
  end
end

def lookup_attr(node, attr)
  attr.split('.').inject(node) do |memo, meth|
    memo.send meth.to_sym
  end
end


puts DEFAULT_ATTRS.to_csv
csv = CSV.generate do |csv|
  data_for_csv.each do |data|
    csv << data
  end
end
puts csv