Jekyll plugin to render less.js - fixed for new versions of jekyll

lessjs.rb

module Jekyll
  
  class LessCssFile < StaticFile
    def write(dest)
      # do nothing
    end
  end
  
# Expects a lessc: key in your _config.yml file with the path to a local less.js/bin/lessc
# Less.js will require node.js to be installed
  class LessJsGenerator < Generator
    safe true
    priority :low
    
    def generate(site)
      src_root = site.config['source']
      dest_root = site.config['destination']
      less_ext = /\.less$/i
      
      raise "Missing 'lessc' path in site configuration" if !site.config['lessc']
      
      # static_files have already been filtered against excludes, etc.
      site.static_files.each do |sf|
        next if not sf.path =~ less_ext
        
        less_path = sf.path
        css_path = less_path.gsub(less_ext, '.css').gsub(src_root, dest_root)
        css_dir = File.dirname(css_path)
        css_dir_relative = css_dir.gsub(dest_root, '')
        css_name = File.basename(css_path)
        
        FileUtils.mkdir_p(css_dir)

        begin
          command = [site.config['lessc'], 
                     less_path, 
                     css_path
                     ].join(' ')
                     
          puts 'Compiling LESS: ' + command
                     
          `#{command}`
          
          raise "LESS compilation error" if $?.to_i != 0
        end
        
        # Add this output file so it won't be cleaned
        site.static_files << LessCssFile.new(site, site.source, css_dir_relative, css_name)
      end
    end
    
  end
end

Found a bug with generating css with lessc. I guess new lessc generator doesn't take OUTPUT file argument but just spits itout to STDOUT, so the above generator will fail, I've fixed the bug by adding > to the command. Here's the gist https://gist.github.com/tdak/6496935

The line that adds the css file to site.static_files isn't working for me. There's no error, but the css file still gets cleaned. I can see that it's being created and then deleted within a fraction of a second.

If I create /css/test.css alongside /css/test.less, then /_site/css/test.css will not get cleaned by Jekyll. It's not pretty, but it works for now until someone figures out why this plugin isn't preventing the css file from being cleaned.

Hi all, i am newbie. When i build with less plugin, i get error:
_jekyll 2.5.3 | Error: Permission denied - ./css D:/Working/Jekyll/casino8/css/test.less D:/Working/Jekyll/casino8/site/css/test.css

Plz, help me.