flatten_json

#!/usr/bin/env ruby
require "json"

def flatten_hash(hash, parent_key = "")
  result_hash = {}
  hash.each do |key, value|
    if value.is_a? Hash
      result_hash.merge! flatten_hash(value, key)
    else
      result_key = if parent_key.empty? then key else "#{parent_key}.#{key}" end
      result_hash[result_key] = value
    end
  end
  result_hash
end

file = STDIN.read
hash = JSON.parse file

flat_hash = flatten_hash hash
puts JSON.pretty_generate(flat_hash)