brew/Library/Homebrew/utils/repology.rb

require 'net/http'
require 'json'

module RepologyParser
  def call_api(url)
    puts "- Calling API #{url}"
    uri = URI(url)
    response = Net::HTTP.get(uri)

    puts "- Parsing response"
    JSON.parse(response)
  end

  def query_repology_api(last_package_in_response = '')
    url = 'https://repology.org/api/v1/projects/' + last_package_in_response + '?inrepo=homebrew&outdated=1'

    call_api(url)
  end

  def parse_repology_api()
    puts "\n-------- Query outdated packages from Repology --------"
    page_no = 1
    puts "\n- Paginating repology api page: #{page_no}"

    outdated_packages = query_repology_api('')
    last_pacakge_index = outdated_packages.size - 1
    response_size = outdated_packages.size

    while response_size > 1  do
      page_no += 1
      puts "\n- Paginating repology api page: #{page_no}"

      last_package_in_response = outdated_packages.keys[last_pacakge_index]
      response = query_repology_api("#{last_package_in_response}/")

      response_size = response.size
      outdated_packages.merge!(response)
      last_pacakge_index = outdated_packages.size - 1
    end

    puts "\n- #{outdated_packages.size} outdated packages identified by repology"

    outdated_packages
  end
end