simplest possible ruby bzip2 library

bzip2.rb

require 'open3'
require 'delegate'
require 'stringio'

class BzipFile < SimpleDelegator
  attr_accessor :path
end

# Features and nonfeatures:
# * doesn't support writing
# * the decompressed file must fit in memory
# * only on *nix (might work on Cygwin)

def bz2_simple_open filename
  stdout, _status = Open3.capture2("bzip2 -dc #{filename}")
  return BzipFile.new(StringIO.new(stdout)).tap do |obj| 
    obj.path = filename
  end
end