clean_up_yaml.rb

#!/usr/bin/env ruby

require 'yaml'

class Hash
  def deep_reject(&blk)
    self.dup.deep_reject!(&blk)
  end
  def deep_reject!(&blk)
    self.each do |k, v|
      v.deep_reject!(&blk)  if v.is_a?(Hash)
      self.delete(k) if blk.call(k, v)
    end
  end
  def to_hash_recursive
    result = self.to_hash
    result.each do |key, value|
      case value
        when Hash
          result[key] = value.to_hash_recursive
        when Array
          result[key] = value.to_hash_recursive
      end
    end
    result
  end
  def sort_by_key(recursive = false, &block)
    self.keys.sort(&block).reduce({}) do |seed, key|
      seed[key] = self[key]
      if recursive && seed[key].is_a?(Hash)
        seed[key] = seed[key].sort_by_key(true, &block)
      end
      seed
    end
  end
end

class Array
  def to_hash_recursive
    result = self
    result.each_with_index do |value,i|
      case value
        when Hash
          result[i] = value.to_hash_recursive
        when Array
          result[i] = value.to_hash_recursive
      end
    end
    result
  end
end


file = ARGV[0].to_s
raise "File not found: #{file}" unless File.exists?(file)

hash = YAML.load_file file
hash.deep_reject! { |k, v| v.nil? || v.empty? }

yaml = YAML.dump(hash.sort_by_key(true))[4..-1]  # remove leading "---\n"

puts yaml