brew/Library/Homebrew/dev-cmd/update-license-data.rb

# frozen_string_literal: true

require "commands"
require "cli/parser"
require "json"
require "net/http"
require "open-uri"

module Homebrew
  module_function

  SPDX_FOLDER_PATH = (HOMEBREW_LIBRARY_PATH/"data").freeze
  FILE_NAME = "spdx.json"
  SPDX_DATA_URL = "https://raw.githubusercontent.com/spdx/license-list-data/master/json/licenses.json"

  def update_license_data_args
    Homebrew::CLI::Parser.new do
      usage_banner <<~EOS
        `update_license_data` <cmd>

          Update SPDX license data in the Homebrew repository.
      EOS
      switch "--fail-if-changed",
             description: "Return a failing status code if current license data's version is different from"\
                           "the upstream. This can be used to notify CI when the SPDX license data is out of date."

      max_named 0
    end
  end

  def update_license_data
    update_license_data_args.parse
    puts "Fetching newest version of SPDX License data..."
    resp = Net::HTTP.get_response(URI.parse(SPDX_DATA_URL))

    File.open(SPDX_FOLDER_PATH/FILE_NAME, "wb") do |file|
      file.write(resp.body)
    end

    return unless args.fail_if_changed?

    system("git diff --stat --exit-code #{SPDX_FOLDER_PATH/FILE_NAME}")
  end
end