悔しかったらDynamic!

dynamic.rb

# Ruby には OpenStruct (require 'ostruct') もあるから微妙だけど。
#

module Dynamic
   def method_missing(action, *args)
      if args.empty?
         self[action]
      elsif action.match(/=$/)
         self[action.to_s.chop.to_sym] = args.first
      end
   end
end

class Hash
   include Dynamic
   def self.ltsv(str)
      str.gsub!(/:(\w+)\t?/, ':"\1",')
      eval "{#{str.chop}}"
   end
end

hoge = {}
hoge.piyo = 1
p hoge #=> {:piyo => 1}

p Hash.ltsv "hoge:1\tpiyo:huga" #=> {:hoge => "1", :piyo => "huga"}