# 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>"

      end

    end

  end

end

Liquid::Template.register_tag('include_code', Jekyll::IncludeCodeTag)