Parse the Gemfile.lock file and print the list of Gems that Bundler would install

wat_gems.rb

require "bundler"

bundle = Bundler::LockfileParser.new(Bundler.read_file(Bundler.default_lockfile))

gem_name_version_map = bundle.specs.map { |spec|
  [
    spec.name,
    spec.version.to_s,
  ]
}

STDOUT.puts gem_name_version_map.map { |pair| pair.join(" ") }