# Title: Include Code Tag for Jekyll
 # Author: Brandon Mathis http://brandonmathis.com
 # Description: Import files on your filesystem into any blog post as embedded code snippets with syntax highlighting and a download link.
 # Configuration: You can set default import path in _config.yml (defaults to code_dir: downloads/code)
 #
 # Syntax {% include_code path/to/file %}
 #

 # Example 1:

 # {% include_code javascripts/test.js %}
 #
 # This will import test.js from source/downloads/code/javascripts/test.js
 # and output the contents in a syntax highlighted code block inside a figure,
 # with a figcaption listing the file name and download link
 #

 # Example 2:
 # You can also include an optional title for the <figcaption>
 #
 # {% include_code Example 2 javascripts/test.js %}
 #
 # will output a figcaption with the title: Example 2 (test.js)
 #

 require './plugins/pygments_code'

 require 'pathname'
 
 module Jekyll
 
   class IncludeCodeTag < Liquid::Tag

     include HighlightCode

     def initialize(tag_name, markup, tokens)
       @title = nil
       @file = nil
       if markup.strip =~ /(.*)?(\s+|^)(\/*\S+)/i
         @title = $1 || nil
         @file = $3
       end

       super
     end
 
     def render(context)

       code_dir = (context.registers[:site].config['code_dir'].sub(/^\//,'') || 'downloads/code')

       code_path = (Pathname.new(context.registers[:site].source) + code_dir).expand_path
       file = code_path + @file
 
       if File.symlink?(code_path)
         return "Code directory '#{code_path}' cannot be a symlink"
       end
 
       unless file.file?
         return "File #{file} could not be found"
       end
 
       Dir.chdir(code_path) do
         code = file.read

         @filetype = file.extname.sub('.','')

         @filetype = 'objc' if @filetype == 'm'
         @filetype = 'perl' if @filetype == 'pl'

         title = @title ? "#{@title} (#{file.basename})" : file.basename

         url = "#{context.registers[:site].config['url']}/#{code_dir}/#{@file}"

         source = "<div><figure role=code><figcaption><span>#{title}</span> <a href='#{url}'>download</a></figcaption>\n"

         source += " #{highlight(code, @filetype)}</figure></div>"

         partial = Liquid::Template.parse(source)
         context.stack do
           partial.render(context)
         end
       end
     end
   end
 
 end
 
 Liquid::Template.register_tag('include_code', Jekyll::IncludeCodeTag)