uu59/gem_release_helper

require "pathname"
require "open-uri"
require "logger"
require "rake"
require "erb"
require "json"
require "rubygems"

module GemReleaseHelper
  module Tasks
    module Common
      class OptionError < StandardError; end

      include Rake::DSL

      attr_reader :options

      def initialize(options = {})
        raise "options should be a Hash, given #{options.class}: #{options} " unless options.is_a?(Hash)
        @options = options
        validate_options
      end

      def self.included(klass)
        Tasks.register(klass)
      end

      def install_tasks
        raise NotImplementedError
      end

      def validate_options
        raise OptionError, "gemspec file path is required" unless options[:gemspec]
        raise OptionError, "gemspec file '#{options[:gemspec]}' is not found" unless File.exists?(options[:gemspec])

        required_options.map(&:to_sym).each do |opt|
          raise OptionError, "#{opt} is required" unless options[opt]
        end
      end

      def logger
        ::Logger.new(STDERR)
      end

      def gemspec_path
        Pathname.new(File.expand_path(options[:gemspec]))
      end

      def root_dir
        gemspec_path.dirname
      end

      def gemfiles_dir
        root_dir.join("gemfiles")
      end

      def required_options
        [] # Implement this in subclass if needed
      end

      def embulk_tags
        @embulk_tags ||= JSON.parse(open("https://api.github.com/repos/embulk/embulk/tags").read)
      end

      def embulk_versions
        embulk_tags.map{|tag| Gem::Version.new(tag["name"][/v(.*)/, 1])}.sort
      end
    end
  end
end