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require 'rubygems'
require 'rubygems/package'
def Gem.unpack(file, dir = nil)
pkg = Gem::Package.new(file)
spec = pkg.spec
target = spec.full_name
target = File.join(dir, target) if dir
pkg.extract_files target
spec_file = File.join(target, "#{spec.name}.gemspec")
open(spec_file, 'wb') do |f|
f.print spec.to_ruby
end
puts "Unpacked #{file}"
end
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