brew listからBrewfileを作るスクリプトだけどそもそもbrewdlerを使った事が無かった

generate_brewfile.rb

require 'open3'

formula = Open3.capture3("brew list")

File.open("Brewfile", "w") do |file|
  file << "update\n"
  file << "upgrade\n"
  file << "\n"

  formula[0].split(/\n/).each do |f|
    file << "install #{f}\n"
  end

  file << "\n"
  file << "clean\n"
end