class Bundler::GemHelper

def build_gem
  file_name = nil
  sh("gem build -V '#{spec_path}'") { |out, code|
    file_name = File.basename(built_gem_path)
    FileUtils.mkdir_p(File.join(base, 'pkg'))
    FileUtils.mv(built_gem_path, 'pkg')
    Bundler.ui.confirm "#{name} #{version} built to pkg/#{file_name}."
  }
  File.join(base, 'pkg', file_name)
end