Given a nested hash, pretty print a list of corresponding dotted property = value lines

hashify_nested_to_properties_list.rb

require 'JSON'
require 'pp'

def hashList( list, value )

  head, *tail = list

  head.sub!( /\[(.+)\]/, '\1' )

  case tail

  when []

    " { #{head} => '#{value}' } "

  else

    "{ #{head} => #{hashList( tail, value )} }"

  end
end

class ::Hash
  def deep_merge(second)
    merger = proc { |key, v1, v2| Hash === v1 && Hash === v2 ? v1.merge(v2, &merger) : v2 }
    self.merge(second, &merger)
  end
end

def hashify( properties )

  strings = properties.collect { |l|

    parts = l.partition( '=' )

    if parts[1] == '='

      key = parts[0]

      value = parts[2].chomp

      key.gsub!( /\.?([^\.]+)/, %q(['\1']) )

      keys = key.scan( /\['[^']+'\]/ )

      hashList( keys, value )

    end

  }.reject{ |s| s.nil? }

  desireds = strings.collect { |sh|

    JSON.parse( sh.gsub("'",'"').gsub('=>',':') )
  }

  big = Hash.new()

  desireds.each { |h|

    big = big.deep_merge( h )

  }

  pp big

end