# Title: Include Array Tag for Jekyll
 # Author: Jason Woodward http://www.woodwardjd.com
 # Description: Import files on your filesystem as specified in a configuration variable in _config.yml.  Mostly cribbed from Jekyll's include tag.
 # Syntax: {% include_array variable_name_from_config.yml %}
 #
 # Example 1:
 # {% include_array asides  %}
 #
 # _config.yml snippet:
 # asides: [asides/twitter.html, asides/custom/my_picture.html]
 #
 module Jekyll
 
   class IncludeArrayTag < Liquid::Tag
     Syntax = /(#{Liquid::QuotedFragment}+)/
     def initialize(tag_name, markup, tokens)
       if markup =~ Syntax
         @array_name = $1
       else
         raise SyntaxError.new("Error in tag 'include_array' - Valid syntax: include_array [array from _config.yml]")
       end
 
       super
     end
 
     def render(context)
       includes_dir = File.join(context.registers[:site].source, '_includes')
 
       if File.symlink?(includes_dir)
         return "Includes directory '#{includes_dir}' cannot be a symlink"
       end
 
       rtn = ''
       (context.environments.first['site'][@array_name] || []).each do |file|
         if file !~ /^[a-zA-Z0-9_\/\.-]+$/ || file =~ /\.\// || file =~ /\/\./
           rtn = rtn + "Include file '#{file}' contains invalid characters or sequences"
         end
 
         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
       end
       rtn
     end
   end
 
 end
 
 Liquid::Template.register_tag('include_array', Jekyll::IncludeArrayTag)