Create separate class for loading meta-tags.

require "jsduck/meta_tag"

require 'jsduck/author_tag'

require 'jsduck/doc_author_tag'

module JsDuck

  # Loads user-defined meta-tags

  class MetaTagLoader

    # instatiates builtin meta tags

    def initialize

      @classes = MetaTag.descendants

      @meta_tags = @classes.map {|cls| cls.new }

    end

    # Loads user-defined meta-tags from given paths.

    # Returns list of meta-tag instances.

    def load(paths)

      paths.each do |path|

        if File.directory?(path)

          Dir[path+"/**/*.rb"].each do |file|

            require(file)

            init_remaining

          end

        else

          require(path)

          init_remaining

        end

      end

      @meta_tags

    end

    # Instantiates meta tag classes that haven't been instantiated

    # already. This is called after each meta-tags file is loaded so

    # that the list of meta-tags will be in order specified from

    # command line.

    def init_remaining

      MetaTag.descendants.each do |cls|

        if !@classes.include?(cls)

          @classes << cls

          newtag = cls.new

          @meta_tags = @meta_tags.find_all {|t| t.name != newtag.name }

          @meta_tags << newtag

        end

      end

    end

  end

end

require 'optparse'

require 'jsduck/meta_tag'

require 'jsduck/author_tag'

require 'jsduck/doc_author_tag'

require 'jsduck/meta_tag_loader'

module JsDuck

    def parse!(argv)

      create_option_parser.parse!(argv).each {|fname| read_filenames(fname) }

      validate

      load_meta_tags

    end

    # Instanciate all loaded MetaTag implementations

    def load_meta_tags

      # instantiate builtin meta tags

      @meta_tag_classes = MetaTag.descendants

      @meta_tag_classes.each do |cls|

        @meta_tags << cls.new

      end

      # Load user-defined meta-tags

      @meta_tag_paths.each do |path|

        if File.directory?(path)

          Dir[path+"/**/*.rb"].each do |file|

            require(file)

            init_remaining_meta_tags

          end

        else

          require(path)

          init_remaining_meta_tags

        end

      end

    end

    # Instantiates meta tag classes that haven't been instantiated

    # already. This is called after each meta-tags file is loaded so

    # that the list of meta-tags will be in order specified from

    # command line.

    def init_remaining_meta_tags

      MetaTag.descendants.each do |cls|

        if !@meta_tag_classes.include?(cls)

          @meta_tag_classes << cls

          newtag = cls.new

          @meta_tags = @meta_tags.find_all {|t| t.name != newtag.name }

          @meta_tags << newtag

        end

      end

      @meta_tags = MetaTagLoader.new.load(@meta_tag_paths)

    end

    def create_option_parser