Flattens hashes/arrays into a single level hash with the full json key path as a top level key. Useful for finding differences between two large manifests.

flarp.rb

# Usage:
# (irb)> { "some" => [{"keys" => "with", "some" => ["values"]}]}.flarp
#  => {"some.0.keys"=>"with", "some.0.some.0"=>"values"} 

class Hash
  def flarp(h = {}, prefix = nil)
    each do |k, v|
      new_k = [prefix, k].compact.join(".")

      if v.is_a?(Array) || v.is_a?(Hash)
        v.flarp(h, new_k)
      else
        h[new_k] = v
      end
    end

    h
  end
end

class Array
  def flarp(h = {}, prefix = nil)
    each_with_index do |v, i|
      new_k = [prefix, i].compact.join(".")

      if v.is_a?(Array) || v.is_a?(Hash)
        v.flarp(h, new_k)
      else
        h[new_k] = v
      end
    end

    h
  end
end