Jekyll - list directories from a path

README.md

usage

{% directory_list directory:products/tea iterator:item sort:descending %}
  {{ item }}
{% enddirectory_list %}

directory_listing_tag.rb

#usage:
#{% directory_list directory:products/tea iterator:item sort:descending %}
#   {{ item }}
#{% enddirectory_list %}

module Jekyll
    class DirectoryListingTag < Liquid::Block

        include Liquid::StandardFilters
        Syntax = /(#{Liquid::QuotedFragment}+)?/

        def initialize(tag_name, markup, tokens)
            @attributes = {}

            @attributes['directory'] = '';
            @attributes['iterator'] = 'item';
            @attributes['sort'] = 'ascending';

            # Parse parameters
            if markup =~ Syntax
                markup.scan(Liquid::TagAttributes) do |key, value|
                    @attributes[key] = value
                end
            else
                raise SyntaxError.new("Bad options given to 'loop_directory' plugin.")
            end

            super
        end

        def render(context)
            context.registers[:loop_directory] ||= Hash.new(0)

            directory = Dir.glob("#{@attributes['directory']}/*").select {|f| File.directory? f}

            if @attributes['sort'].casecmp( "descending" ) == 0
                directory.sort! {|x,y| y <=> x }
            else
                # sort normally in ascending order
                directory.sort!
            end

            result = []

            context.stack do

                directory.each { |pathname|
                  context[@attributes['iterator']] = File.basename(pathname)
                  result << render_all(@nodelist, context)
                }

            end

            result
        end
    end
end

Liquid::Template.register_tag('directory_list', Jekyll::DirectoryListingTag)