# encoding: utf-8

module Nanoc::Extra

  # @deprecated Create a File instance directly and use that instead.
  class FileProxy

    instance_methods.each { |m| undef_method m unless m =~ /^__/ || m.to_s == 'object_id' }

    @@deprecation_warning_shown = false

    def initialize(path)
      @path = path
    end

    def freeze
    end

    def respond_to?(meth, _include_all = false)
      file_instance_methods.include?(meth.to_sym)
    end

    def method_missing(sym, *args, &block)
      unless @@deprecation_warning_shown
        $stderr.puts 'WARNING: The :file attribute is deprecated and will be removed in a future version of nanoc. Instead of using this :file attribute, consider manually creating a File object when it’s needed, using the :content_filename, :meta_filename or :filename attributes.'
        @@deprecation_warning_shown = true
      end

      File.open(@path, 'r') { |io| io.__send__(sym, *args, &block) }
    end

    private

    def file_instance_methods
      @@file_instance_methods ||= Set.new(File.instance_methods.map { |m| m.to_sym })
    end

  end

end