brew/Library/Homebrew/cask/lib/hbc/artifact/abstract_flight_block.rb

require "hbc/artifact/base"

module Hbc
  module Artifact
    class AbstractFlightBlock < Base
      def self.artifact_dsl_key
        super.to_s.sub(%r{_block$}, "").to_sym
      end

      def self.uninstall_artifact_dsl_key
        artifact_dsl_key.to_s.prepend("uninstall_").to_sym
      end

      def self.class_for_dsl_key(dsl_key)
        Object.const_get("Hbc::DSL::#{dsl_key.to_s.split("_").collect(&:capitalize).join}")
      end

      def self.me?(cask)
        cask.artifacts[artifact_dsl_key].any? ||
          cask.artifacts[uninstall_artifact_dsl_key].any?
      end

      def install_phase
        abstract_phase(self.class.artifact_dsl_key)
      end

      def uninstall_phase
        abstract_phase(self.class.uninstall_artifact_dsl_key)
      end

      private

      def abstract_phase(dsl_key)
        @cask.artifacts[dsl_key].each do |block|
          self.class.class_for_dsl_key(dsl_key).new(@cask).instance_eval(&block)
        end
      end
    end
  end
end