Stylus Jekyll plugin

_config.yml

# Optional stylus section
# 'command' defaults to 'stylus' if not present
# 'options' default to blank if not present
# 'options' are a YAML String
stylus:
  command: ./node_modules/stylus/bin/stylus
  options:
    --include ./css
    --include ./node_modules/nib/lib

stylus_converter.rb

module Jekyll
  class StylusConverter < Converter
    safe true
    priority :high
    
    def matches(ext)
      ext =~ /^\.styl$/i
    end
    
    def output_ext(ext)
      ".css"
    end
    
    def convert content
      require 'open3'
      
      cmd = 'stylus'
      if @config['stylus']
        cmd = @config['stylus']['command'] if @config['stylus']['command']
        cmd = "#{cmd} #{@config['stylus']['options']}"
      end

      value = Open3.popen3(cmd) do |stdin, stdout, stderr, wait_thr|
        begin
          stdin.puts content
          stdin.close
          err = stderr.read
          STDERR.puts err if err.length > 0
          raise wait_thr.value.exitstatus.to_s if wait_thr.value.exitstatus != 0
          stdout.read
        rescue => e
          puts "stylus had errors, error number #{e.message}"
        end
      end
    end
  end
end

test.styl

---
---

// .styl file must start with YAML front matter
// @import files must NOT start with YAML front matter

p
  margin: 2px