Write all Ruby gem dependencies with their licenses into a CSV file

gem_licenses_to_csv.rb

require 'csv'

csv_path = Rails.root.join("#{Rails.application.class.parent.name.underscore.dasherize}_licenses.csv")

CSV.open(csv_path, 'wb') do |csv|
  csv << ['Gem', 'Licenses']
  
  Gem.loaded_specs.each do |gem_name, spec| 
    csv << [gem_name, spec.licenses.join(', ')]
  end
end