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_PATH = (HOMEBREW_LIBRARY_PATH/"data/spdx.json").freeze
  SPDX_DATA_URL = "https://raw.githubusercontent.com/spdx/license-list-data/HEAD/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 This can be used to notify CI when the SPDX license data is out of date."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
    ohai "Updating SPDX license data..."
    spdx_download_result = curl(SPDX_DATA_URL)
    SPDX_PATH.write(spdx_download_result.stdout, true)
    return unless args.fail_if_changed?

    system("git diff --stat --exit-code #{SPDX_PATH}")
  end
end