Jekyll tag for creating "download cards"

download.rb

# Title: Download tag for Jekyll
# Author: Brett Terpstra http://brettterpstra.com
# Description: Create updateable download cards for downloadable projects. Reads from a downloads.csv file in the root folder
#
# Example: {% download id %} to read download [id] from the CSV


module Jekyll
  class DownloadTag < Liquid::Tag
    require 'csv'
    @title = nil
    @file = ''
    @info = ''
    @icon = nil
    @template = 'link'

    def initialize(tag_name, markup, tokens)
      if markup =~ /^(\d+)( .*)?$/
        req_id = $1.strip
        @format = $2.strip.to_i unless $2.nil?
        CSV.read("downloads.csv").each do |line|
          if line[0] == req_id
            id, title, file, version, description, info, icon, updated = line
            @file = file
            @version = version == '' ? '' : %Q{ v#{version}}
            @title = %Q{#{title}#{@version}}
            @icon = icon == '' ? '' : %Q{<img src="#{icon}" width="100" height="100">}
            @updated = updated == '' ? '' : %Q{<p class="dl_updated">Updated #{updated.sub(/[\d:]+ -\d+ (\d+)/,"\\1").strip}.</p>}
            @description = description == '' ? '' : %Q{<p class="dl_description">#{description}</p>#{@updated}}
            @info = info == '' ? '' : %Q{<p class="dl_info"><a href="#{info}" title="More information on #{title}">More info&hellip;</a></p>}
            break
          end
        end
      end
      super
    end
# TODO: Make this read templates
# Example:
#     Dir.chdir(includes_dir) do
#       choices = Dir['**/*'].reject { |x| File.symlink?(x) }
#       if choices.include?(file)
#         source = File.read(file)
#         partial = Liquid::Template.parse(source)
#         context.stack do
#           rtn = rtn + partial.render(context)
#         end
#       else
#         rtn = rtn + "Included file '#{file}' not found in _includes directory"
#       end
#     end
    def render(context)
      output = super
      # TODO: Enable template selection
      if @title
        download = %Q{<div class="download"><h4>#{@title}</h4><p class="dl_icon"><a href="#{@file}" title="Download #{@title}">#{@icon}</a></p><div class="dl_body"><p class="dl_link"><a href="#{@file}">Download #{@title}</a></p>#{@description}#{@info}</div></div>}
      else
        "Error processing input, expected syntax: {% download title filename [url/to/related/post] %}"
      end
    end
  end
end

Liquid::Template.register_tag('download', Jekyll::DownloadTag)