Generates a new ml.yml using the current en.yml , using old ml.yml's translated string wherever possible . This is really ugly though , there must be something that actually does this neatly

translate.rb

# encoding: UTF-8
require 'yaml'
sf = File.open("original_ml.yml", "r")
src = YAML::load(sf.read)
sf.close

rf = File.open("current_en.yml", "r")
ref = YAML::load(rf.read)
rf.close

@ml_orig = src['ml_IN']
@current_en =  ref['en']
@h = Hash.new { |l, k| l[k] = Hash.new(&l.default_proc) }


def walk_and_translate(hash,source_key = nil)
  hash.each do |key,value|
    if value.is_a? Hash
      next_key = source_key.nil? ? "#{key}" : "#{source_key},#{key}"
      walk_and_translate(value,next_key)
    else
      current_key = source_key.nil? ? "#{key}" : "#{source_key},#{key}"
      p"Existing #{current_key} => #{value}"
      available_translation = fetch_translation(@ml_orig,"#{current_key}")
      new_translation = available_translation.nil? ? fetch_translation(@reference_hash,"#{current_key}") :   available_translation
      p "Generated #{current_key} => #{new_translation}"
      key_string = current_key.split(",").collect{|n| "['#{n}']"}.join
      eval "@h#{key_string} =  #{new_translation.to_s.inspect}"
    end
 end
end

def fetch_translation(mother_hash,key_chain)
  f,l = key_chain.split(",",2)
  begin
    val =  mother_hash.fetch f unless mother_hash.nil?
    (l.nil? ? val : fetch_translation(val,l))  unless val.nil?
  rescue IndexError
  end
end

walk_and_translate(@current_en)

File.open( 'new.yaml', 'w' ) do |out|
    YAML.dump( {:ml_IN=>@h}, out )
end